Aelita service manual OCR

PAGE 2



ATTENTION! ‘,

`

Possible changes to. principal scheme of electronic -

musical synthesizer (EMC) AELITA will be in the future
reflected in the instruction manual attached to the inst
rument.

1. INTRODUCTION

1.1. This instruction provides a search technique-

inconsistency, repair, adjustment and adjustment of electric

mechanical and mechanical components of electronic musical synthesis
torus AELITA. .

1.2. AELITA is a solo three-voice.

electronic synthesizer with great musical art
| mi and technical capabilities. °

AELITA is a widely used tool as
in musical ensembles, and at home. |

The tool has devices with which you can
to get the vibration of sounds, sounds, varying in timbre, complex
sounds made up of the sounds of several octaves.

For ngra on the instrument AELITA PTZ amplifier is required-
frequency with an acoustic unit (e.g. ELECTRON:
104C). .

Note. In the textbook of instructions, the following
terms:
frequency vibrato — Vibration of sounds in frequency, semi-random for
frequency account. modulation of sounds with a low-frequency signal with an hour

.
total 2-10 Hz;
| timbre vibrato — vibration of sound along a timbre with frequency
. 92-10 Hz; -,
1 °. harmonic synthesis — implements the required amount of

beating harmonics (overtones);

timbre percussion — a sharp change in the timbre of sound from you`

voltage when you press any key on the device;

`` wow effect — a device with which the resonance
the frequency of the selective amplifier can be changed in a certain
nom frequency range; `

chromatic gamma — This is the gamut in which every octave

divided evenly into twelve semitones, i.e. seven white n

five black keys. The frequency of adjacent halftones is different
about. ; 3

‘

".‚ Low to high, obtained by the filing of a steward,

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PAGE 3

2. in |
by a factor equal = 10595 This dependence rasirost-

`wounded on the entire scale and applies to any adjacent key-.
keyboard spam. Sounds of the same name in adjacent octaves ’ex.
double in frequency;

attack — a smooth change in the rise of the sound, will receive:
due to the required formation of the leading front
_ signal in the former; .

attenuation — the effect of fading in volume sounds, resulting in ”
due to the fact that the modulator after releasing the key
continues to work until there is enough energy for
discharge capacity to power the shaper, which
starts the corresponding modulator;

amplitude vibrato — vibration of sounds by volume, zero
obtained by amplitude modulation of sounds rectangular
a signal with a frequency of 5-8 Hz;

glissando - smoothly changed in frequency by a certain
value.

‚1.3. AELITA synthesizer is designed in a metal case
from light alloys. The outer surface of the cover and housing
digging vinyl artificial leather. Composite tool body. It consists
from the lid and the pallet on which the main functions are mounted
On-site nodes: keyboard, power supply, tops board.

`The controls are combined in a’ separate unit — control unit- °

equalization. The composition of the control panel includes a board specifying gs ”
nerators tuned to a frequency of the order of 6.5 MGi, filter
low frequency, controlled by constant voltage, gsner-
a torus of infralow frequencies for modulation of master heterators and
for modulating the filter, the shaper transient
teak for filter and switching board.

The remote control is attached to the corus on rotary devices and with
folding folds, closing free space
above the keyboard. Remote ‘electrically connected to the instrument
‘Using a flexible cable. The panel is made of aluminum, okle-
yen outside the skin. Both in working and in transport position -
The remote control is fixed with two side screws. Functional
The graphics were made on polyetirol linings. |

1.4. In the text of the instruction

the following designations are accepted
functional devices.

1.4.1. Board of the GHG master generators.
1.4.2. Tone card `PT.



3. Filter board

1.4

1.44. PSU power supply,
1.4.5. Control board about ‚PU.
1.4 pcs. ''
1.4

.6. Switching fee
L. Pedal volume _ | PP

- 2. TECHNICAL DESCRIPTION.

synthesizer

2.1. Electronic Music Options

must ‘correspond to the values ​​given in table. | according to:
In accordance with the technical conditions of EI? 2.940.017 TU.



di:



Table 1
Parameter Name | Norma Prime-
| reading
1. The error in building the tool mod-
Liu, $, no more than 0.15
2. Care of the instrument in 4 hours. continuous- | .
modular work,%, no more at | 0.5
. permissible temperature change, ° С] +2
humidity,% +2
3. The restructuring of each vote, okt, not me:
n .. 1,0
4. General restructuring, oct, at least 46
5. The voltage of the output signal, V, ne ms- | _
her. 0.25. .
° at load, kOhm, not less than 100 -:
6. Volume control range, dB, ne
menes 60
7. The background level of the pause, dB, ie more than minus 55.
8. Power consumption, VA, not more than 25





2.2. AELITA electronic music synthesizer consists

of the following main nodes and blocks:

1} master generators,. .

2) tone boards,,
3) filter boards, ‘’

4) control board number 1,

5) switching commutation, ^

6) control board No. 2,

7} power supply,

8) keyboards

2 Order 460 ._. .5


PAGE 4

3). volume pedals
10) connection board:

2.3. Description of the structural diagram.
The block diagram is shown in Fig. |.

‚Three master generators generate an order frequency
6.5 MHz each. From the output of each master signal generator

‘Ly come to the tone board at the corresponding conversion
_ ruler. Each scaler consists of eight after.

integrated triggers executed on microcircuits
type K155TME,

The code of each key using a diode matrix on the board
The control goes to the memory device in the tone board and with
moves of memory cells (K $ - trigger on K155LAZ microcircuits)
steps on the control inputs of the scale bar. So
the division coefficient of each ruler changes at once. Management
the numbing chains of the gauge rulers are connected by the ranks of the parallel

lolno. From the outputs of the recalculated rulers, the signals arrive at ok-_

tavtsy dividers. From each output of octave dividers
rectangular shape arrive on the switching board, where
There is a choice of an octave of sound and a choice of the form of sound. With the exit pic!
of the ice octavic divider, the signals arrive at the filter, control:
voltage controlled, and voltage controlled amplifier.
Shaper for the filter generates a control voltage
to work out the filter (forms an attack, attenuation and level).

The driver for the amplifier provides a control voltage
Movement to create attack, attenuation. Sound by volume. With out
la ’amplifier signal goes to the output jack
external mixing device, amplifier.

2.4. Description of the electrical circuit diagram
music synthesizer.

2.4.1. Master generators (Fig. 1 app. 4). Gene Fee:
of radiators contains three master oscillators made according to
the same pattern. Each heperator is made on one micro
PG-05 or PG-Ob` or PG-07 type K155LAZ scheme included in
analog mode. The adjustment of the generator is carried out under-

with the core heart and the varicap matrix PG- \ !: (PG- \ ® ,.

PG-UZ) type KVS 120A. Varicap control voltage
matrix. fed through a resistor PG-E17 (PG \ V20, PG-V23) with

Tennometer determining the octave `° reorganization of PG-V29’

(PG-VZ0, PG-K31). General ‘tuning of three generators
is applied by supplying potential through the resistors PG-V! 8, PG-V21,
PG-V24 with potentiometer PG-K27. Frequency master oscillators
must correspond to the dainas indicated in the diagram (Fig. 1

8

.

app. 4). There is an infra-low frequency generator on the board.

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PAGE 5

for modulating master oscillators and for modulating a filter. `

The generator is made on. multiprogram PG-04 according to the multivib-
a radiator. |

On the board is also a string generator, made
according to the ’scheme of an asymmetric multivibrator on a PG-OT chip.
whose frequency is set by the PG-C1 capacity, and the frequency change
- resistor PG-V2.` On the chips PG-02, PG-03 made de-
frequency suppressor with a meander waveform. From direct outputs mi:
PG-03 circuits signals are fed to resistive adders
on PGV4, V5 and PG-V8, 89. `The wetting capacities of PG-C2, PG-S4 are
integrating. At the points. PG-17, 18 received signals treu-
only in shape, out of phase with each other
- 120 °. This signal through the densities of the PG-S4 and PG-S8 triangular
we arrive either on the ground (when the STRINGS button is
in the off state), or in the control circuit
frequency variation of the second and third master oscillators.

2.4.2. Payment of tones (Fig. 1 app. 5). Pay tones serves
to get all the original sounds of the instrument. On the board
put a diode matrix to select any note in the interval
octaves, for example, PT-U89 diodes are used to select MI sweats -
_ PT-U96 and diode matrix on diodes PT-U97 — PT- \ 104, serving-,
to select this sound in any of 4 octaves. These diodes are
dinen with the inputs of memory cells made on microcircuits
K155LAZ according to the B5 $ scheme - a trigger.

Contacts ПТ-Х11, Х5 / 4 of the tone board are connected to
Som, and to all inputs of B $ - triggers connected to the corresponding
General diodes, logic is supplied. bullets. Thus, the task
the conversion factor for the translation ruler, for example,
on the chips PT-07, PT-012 and PT-018, PT-020. On the chip
max PT-07, PT-O! 0. (PT-021, PT-024, PT-OZ5, PT-038) `` assembled
directly variable divider, n by
microcircuits PT-O11, PT-012, (PT-025, PT-026, PT-039, PT-540)
- dividers for receiving sound in a pug octave. ,

On the PT-013, PT-214 microcircuits are assembled directly
octave dividers, and on. the PT-O15 chip is a divider for. half-

the entire musical range of the sawtooth voltage.

Niya. Diodes PT- \ U107 — PT- \ U121 are used to receive a signal from
a duty cycle of eight.

On the PT-216 chip, a switch n formed:
square wave, PNL-shaped and signal
fishing with duty cycle. On the PT-O17 chip, the
The driver of unison signals. The rest of the rulers are executed ”
in a logical way.

2.4.3. Switching fee (Fig. 1 app. 6.). On the board

. mutations are located octave sound select switches

8



niya for all three channels;

nih signals p. |. VIB-switches
RATO for every voice. potentiometers
tons of each register, switches of each voice: On the board
the waveform selection switches and! -

a low generator for modulating master oscillators and.

filter and diodes PK-U1, PK- \ 2, for the formation of falling,
increasing voltage. There are also

Switch to enable modulation of the first master oscillator

third.

2.4.4. Filter board (Fig. 1 app. 3). The filter board is
costs from the low end of the filter on the PF- \ 1 —- PFUY transistors
n control transistors PF-U11, PF-U! 3. Fill out filter
in the form of a chain of serially connected transistors, you "
filling the role of variable resistors n capacitors PF-C2:
PF-S5. |

The signal through pin 4. enters the filter input, and

voltage, e.g. from a variable ’resistor slider
1F-V49 — through the resistor PF-V48. ”
voltage on the base PF- \ Y! 3 change the transition resistance
collector-emitter of this transistor, the base potential changes
PF- \ U11 transistor, its collector resistance changes
emitter, and on the basis of this, the transition resistance changes
collector-emitter of transistor chains, due to which changing:
The initial signal spectrum (high frequency blockage) is very wide.
wide limits. about

On transistors PF-U12, PF - \! 4, PF- \ U15, PF-M16 collector.

matching cascade with a common emitter for conversion
push-pull filter signal into a regular single-cycle signal.
The output signal, which is allocated on the PF-V19 resistor, through
the PF-V21 resistor and the PF-S13 capacitor is fed to the input
la; voltage-controlled, on traction resistors PF- \ U17,
PF-U18. The role of the emitter changing resistor is
transistor PF- \ 19, the basic purpose of which is fed
voltage from the voltage driver for the amplifier.

On transistors PF - \ / 20 — PF- \ U22 matching is made. n
output amplifier whose gain is stabilized

`` transistor PF- \ 21.

There is also a transformer shaper on the board ’

envelope voltage characteristics for
litel assembled on transistors PF- \ 26, PF-UZ1, PF-UZ3,
PF-UZ5, PF \ 37, PF-Ui, PF-U43, PF-U47, PF-U4.

Positive potential from pin 13 of the filter board
steps to the input of the shaper. The circuit of the resistor PF-V7b, cop

9


PAGE 6

the capacitor PF-S20 and the transistor PF-UZ5 formrost parastay-
The main thermal (attack of sound), and the circuit from the transistor PF- \ U41,
capacitor PF-S20 forms a falling potential (attenuation
. sound`}; From the output of the shaper from the emitter PF-U49

The potential potential is brought through the PF-VZ5 resistor to the base of the ears.

‘Pickup transistor PF-U! 9 transistor amplifier
PF-U17, PF-U18. On the board. located also. shaper
Transition characteristics for envelope voltage formations
filter for transistors PF- \ U25, PF- \ 32, PF- \ Z4,
PF- \ UZ6, PF- \ U38, PF- \ 42, PF- \ U44, IF- \ 48, PF-U50.

The principle of operation is similar to the envelope shaper on
voltage for the amplifier. There is a positive circuit in the filter.

feedback, which changes its quality factor with the help of

torus PF-VZ, leading to self-excitation.

2.4.5. Control board (Fig. 1 app. 7). .

The control diodes are located on the control board. \ U [- PU-U24,
Diodes PU- \ U2, PU. \ 4, PU-Ub, PU-U8, PU-U10, PU-U12, PUUM,
PU- \ U! 6, PU- \ 18, PU- \ 20, PU- \ U22, PU-U24 are used to organize:
Octavic sound on. Others are similarly included
diodes for organizing the inclusion of other octaves on the other two
circuit boards. The same diodes PU-U1, connected together, organ
They include the inclusion of sound FA, other diodes, for example, PU- \ 15, or-
Organize the inclusion of sound BEFORE. Similarities are included and others
sounds. about

2.4.6. The connection board. Connecting board
started to connect the electrical circuits of the control unit with
tonal tone and power supply through connectors type © io40.

2.4.7. Volume pedal. The volume pedal is designed as
discharge unit. The pedal is designed to adjust the volume
ty sounding instrument. Change the volume by
by changing the resistance of the photoresistors when changing them
illumination. Odia photoresistor in series with
signal, and the other parallel to the signal. Output signal with
The power is supplied to the non-power amplifier.

2.4.8. Keyboard. Piano Keyboard Valve width
the inside corresponds to the width of the pnino key. Under each

Visha is a pseudo-contact group, with the help of which--

The swarm is the code of the necessary key and octave sound
ka. "°

`2.49. Power supply (Fig. 1 app. 2).

The power supply produces four stabilized voltage
+ 5V for 1A, hypus 0.7 for 0.2A, + 10V for 0.2A and minus 10V for ol.
Each pairing is obtained on its rectifier with a stable
lysers made on transistors KT5OZV and KT817V,
KT50EV and KT816V. KT816V and KT817V transistors are placed on

19

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p + - + - *.

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separate radiators for better heat dissipation. Each straight:
The vehicle is assembled according to a two-half-bridge circuit. For better?
stabilization of low voltage is used in
As a reference voltage + 10V voltage. about

3. ORGANIZATION OF REPAIR

3.1. The radio mechanic in the workplace should have the following
Personal protective equipment: Instrument with insulated
handles, dnemrichesky rug.

*

-

3.2. It is forbidden to check for voltage
"To nskru".

‚3.3. Repair and inspect EMC AELITA under the yarn-
it is allowed only in cases when the completed work
in a device disconnected from the network it is possible (adjustment,
Renne of modes, similar to bad contacts in the switch,
waveform observation). In this case, you must be especially
careful to avoid getting under voltage.

3.4. Measuring instruments must be connected to the ground.
EMC AELITA after disconnecting it from the network by the plug-in
a genius. _:

3.5. In all cases 6 with the included tool
AELITA, when there is a danger of touching current-carrying
parts, it is necessary to use the tool with isolation
with my hands. Work should be with one hand. ,

3.6. Soldering mounting EMC, under tension,
prohibited. about ,

3.7. When replacing a fusible insert, disconnect
EMC from the network. about

3.8. When repairing electronic music. synthesizer
AELITA should be installed but opportunities in a way
to avoid personal injury from a possible explosion of electric
lithium capacitors. ,

3.9. It is forbidden to repair EMC AELITA, including
in the power grid, in damp rooms having earthen, non-cement
other or other conductive floors. In these cases, EMC AELI-

TA should be sent to the workshop. `

3.10. It is forbidden to repair EMC AELITA near the
ground structures (central batteries, if

- no fences um. P.) .

3.11. The list of tools required for repair:

3.11.1. Electric soldering iron with a capacity of not more than 50 W, sting
The box must be grounded. ..

3.11.2. Screwdriver 7810-0313 cd. hr GOST 17199-71.

3.11.3. Side cutters. -

3.11.4. Tweezers. -

3.11.5. Knife.

2.


PAGE 7

Note. When working with microcircuits should be irs-
‚Protection measures are provided‘ against static

in the form of a grounded bracelet, a fallen hand.

3.U. The list of instrumentation, peob-
repair required: °

3.12.1. Electronic oscilloscope TK-4362.
‚3.12.2. Low-frequency generator TV-0157.
`3.12.3. Frequency meter TV-0157.
3.12.4. Tube millivoltmeter TV-0157.
3.12.5. Ampervoltmeter 44324 or similar.

Note. Allowed to use ‚class devices
not worse than indicated.

4. TROUBLESHOOTING METHOD

Before opening the tool for repair, you must-
complete the following.

`4.1. Connect the pedal cable to the instrument output, and co-.

‘Extension cable to the OUT socket. on the pedal n to the amplifier
_ low ‘frequency ELECTRON: 104C with speakers.

Oscilloscope, electronic. frequency meter n voltmeter
read to the output of the instrument.

4.2. Before connecting the tool to the power supply,

my buttons And control knobs set In the following 1 position-_

NII:
1) the GENERAL zone of the SETTING knob — to the “=” position.
2) handles 1, .2, 3 of the zone SETUP — to the * - "position,
3) buttons. "REGISTER zones should be pressed,
4) buttons & m. TEMBR zones should be pressed,

5). VIBRATO 1,2, 3 buttons should be off
position

6} handles “|”, “2”, “3”, (“2 '”, <4 ’”, “8’) of the VOLUME zone
votes, UNISON - in position "10",

7) handle "10’ "- in position" 0 ",

8) ON buttons. VOLUME VOICE, UNISON zones
- in the off position,

9) buttons |, 2 KEYBOARD CONTROL, TREMOLS
TEMBROM CONTROL zones — in the off position,

12



.`

10) knob RANGE, ACUTE, DEPTH, ATTACK, _

ATTENUATION, LEVEL of the TEMBROM CONTROL zone —to
position "0", E

11) ATTACK handles, ATTENUATION of the MANAGEMENT zone

VOLUME - in position "0",

_. 12) handles * 54 "LEVEL of a zone MANAGEMENT OF THUNDER-
BONE — in position “10”, _
| & VOICES,

that 7
13) Fade buttons, „= UNISON

STRINGS- - cut-offs,
o 14) the handle FREQUENCY VIBRATO, TREMOLO - in. position
"0",.

VIBRATO groups - on,

16) the “MOD 1 * 3” button is turned off. . ',

17) VIBRATO DEPTH-handle - in the “0” position. \.
18) handle DEPTH TREMOLO — in position "0", =

19) ‘the volume pedal must be depressed.

15) button and ^

4.3. Insert the plug of the power cord into an electrical outlet
network. Press the NETWORK button. In this case, the light should fade
indicator.

+

The tool is ready to go. o `

4.4. To lose. chromatic scale with hollow pressed
pedal, while the sound of the instrument should be absent
with any key pressed, and the level of signal leakage
must be no more than 5 mV.

4.5. Turn on the top ’zone button. VOLUME -
OWL, UNISON. ''

4.6. Playing the chromatic scale, check the sound
all keys on the keyboard, while the waveform of the signal
must correspond to fig. 1

The sound of each note should be the same in strength
volume in relation to the adjacent note.

.47. In the same way, check the sound, including the night`

rarely the buttons “4”, “8’ ”,“ 16 ’”, “32’ ”of the top row of the REGI- zone
STRA. The remaining buttons and knobs are in the same position as
in transfers 1–18 of clause 4.2 and in clause 4.5;

thirteen.



PAGE 8

x

Note. When playing chromatic: gamma, make sure

In the volume on the “2’ ”register the instrument sounds -

an octave higher in relation to the sound on the
the “4” bar, two octaves higher, respectively
‚But with respect to the sound on the register“ 8’, pa
three octaves higher — on the 16 ’register and four
D of the octave higher — on the “32” regnst. ”

4.8. Similarly. check the sound, including alternately

KNOPKN "", "^ b in the upper row of the zone
TEMBR, on the register "8". (kionka “8’ ”in the upper row of the zone RE-
GISTRA included).

The waveforms of the signals must correspond to fig. 2.3.

4.9. Turn off the top zone button. VOICE VOLUME-
OWL, UNISON.

4.10. Dig in the middle button of the VOLUME -
OWL, UNISON.

4.11. Repeat un. 4.6-4.8 for buttons ‘in the front row of zones
REG ISTRA. TIMBRE.

4.12. Turn off the middle button of the Zone VOICE VOLUME-

With s, UNISON.
`4.13. Turn on the lower entry of the zop. VOLUME VOICE-
OWL, UNISON.

4.14. Repeat un. 4.6–4.8 for buttons in the bottom row of zones
REGISTERS, TEMBR.

4.15. Turn on the upper and middle buttons ’of the GROUND zone:
BONE OF VOICES, UNISON.

4.16. Press the buttons “8’ ”,“ 8 ’”, “8’ ”are called REGISTERS.

4.17. Enable buttons

‚PP› „. P. with C ›zone TEMBR.

4.18. By pressing the twenty-depressed key (la), using
check "|", "2", "3" zops SETUP to achieve a unified sound -
Niya. Moreover, the position of the handles "|", "2", "3" must correspond to
approximately <^ ". ,

4.19. Turn off the middle ’and lower buttons of the THRESHOLD zone.
BONE OF VOICES, UNISON. -

. 4.20. Press the twenty-ninth key (a), frequency
Before. pzhna to be within (440: 10) Guy.

4.21. Move the “1” knob of the SETUP zone to the extreme-
voe position.

4.22. Press the twenty-ninth key (a), frequency
must be within (311 = 10) Hz.

4.23. Move the “1” knob of the HOUR TROIKA zone to the extreme right-

voe position.
4.24. Press the twenty-ninth key (a). frequency
should be in the range of (622-15) Hz.

m



. 4.25. Move the “|” handle of the SETUP zoop to

4.96. The handle of the GENERAL zone NAST ROIKA is transferred to the extreme
top position.
4.27. Press the twenty-ninth key (a), frequency

‹-»

must. be within (593+ 15) Guy.

4.28. GENERAL ZOPE SETUP knob to translate to krayis
lower position.

4.29: Press the twenty-ninth key (a), frequency
should be within (37С = 10) Hz.
° 4.30. Move the GENERAL ZONE SETTING knob to
<- ".

4.31. Turn off the top zoop button VOLUME VOICE-
OWL, UNISON.

4.32. Turn on the middle button of the VOLUME zone:

_ OWL, UNISON.

4.33. Repeat pi. 4.21-4.30, yielding handles "2" of the NAST-
ROYKA.

4.34. Turn off the middle button of the VOLUME zone.
OWL, UNISON:

‚4.35. Turn on any button in the VOLUME VOICE zone.

OWL. TEACHERS.

4.36. Repeat items 4.21-4. 30 for the handle “3” of the zone NASTROPN.
KA.

4.37. Enable buttons ON .. ON, ON thunder zones.
BONE OF VOTES, UNISON:

4.38. Press any key and using the knobs “1”, “2”,
“3” zones SETUP to achieve unison. sounding.

4.39. Turn on the $ ° VOICE button (to
UNISON). "

4.40. Turn on the STRING button.

4.41. The handle of the “1”, “2”, “3” zones of the VOLUME zone is bare:
OWL, UNISON to position "0".

4.42. By pressing any key, and. alternately moving the handle
“|”, “2”, “З” н “16’ ”of the VOICE VOICE, UNISON zone
from position “0” to “10” and back to position “0”, make sure
the presence of the string effect (imitation of the orxstra ringing bow-
out tools).

Note. Alternately moving the handles in the specified
‘Order changes the sound of the instrument to ok-
tavu.

4.43. Move the “1” knob of the VOICE VOICE zone. `
UNISON to position “10” (the remaining handles of this zone are
in position “0”).

4.44. By pressing any key, and, alternately including you:
By pressing the STRING button, make sure of a characteristic change.
sounding instrument.


PAGE 9

4.45. Install + all „handles. n buttons to the position indicated
in transfers 1-18 of paragraph 4.2.

_ 4.46. Turn on the upper ON button. VOLUME zones
VOTES, UNISON.

4.47. Turn on the VIBRATO button 1.
4.48. Turn on the <^ »button to select VIBRATO.
4.49. By pressing any key and moving the FREQUENCY knobs

‚VIBRATO, TREMOLO n DEPTH VIBRATO from the position

“0” to position “10”, make sure that the nature of the inbration changes
The frequency of the needle lubine.

4.50. Turn off the upper ON button. VOLUME zones
VOICES, UNISONS and KIOPO VIBRATO 1.

4.51. Turn on the middle ON button. VOLUME zones
VOTES, UNISON. and.

4.52. Turn on the VIBRATO button 2.

4.53. Repeat step 4.49. ,

4.54. Turn off middle button ON. VOLUME zones
VOICES, UNISON and the button VIBRATO 2. t

4.55. Turn on nanny button ON. VOLUME zones
VOTES, UISSON.

4.56. Turn on the VIBRATE button o 3,

4.57. Repeat, and. 4.49. . ‘

4.58. Pressing the buttons alternately

‹^ No. ,. n | L. to ›
VIBRATO groups, be sure to change the nature of the effect
vibrato.

4.59. Turn off the VIBRATO button 3.

4.60. Soak the upper ON button. VOLUME zones
VOICES, UNISON, turn off the remaining buttons of this zone.

4.61. Turn on the MOD 1 * 3 button.

Press any key and make sure that the mod has appeared:
first generator to a third generator, t. in sound
a peculiar overtone appeared.

`After playing, turn off the MOD 1 * 3 button.

4.62. Turn on the TREMOLO button of the CONTROL zone
TEMBROM in one of the buttons of the VIBRATO group.
`483. Press any key and, holding the DEPTH handles
TREMOLO, VIBRATO FREQUENCY, TREMOLO and, alternately on:
by pressing the VIBRATO group button, make sure that there are
‘Character post timbre tremolo.

4.64. Turn off the TREMSLO button in the CONTROL zone
TEMBROM.

4.65. Turn off all the buttons in the VOICE VOICE zone,

UNISONA.

16

=

AO LOW.

4.66. Lead the TEMB-CONTROL zone SHARP handle
ROM from position “0” to position “10”.

Press any key and by moving the RANGE knob
TEMBROM CONTROL zones from position “0” to “10”, remove

It turns out that the frequency of the sine wave and changes from `high

4.67. PICTURES, DEPTH, ATTACK, ATTENUATION
Set the TEMBROM CONTROL zones in the “10” position.

4.68. Press any key. In this case, the sound frequency should

increase smoothly, and then gradually fall to the low
frequencies. "
4.69. Move the handle LEVEL of the zone MANAGEMENT

TEMBROM in position "10".

Press any key. In this case, the sound frequency should
smoothly age and stay at a certain level.

4.70. DEPTH knob of the zone TEMPER CONTROL
move to position "0".

4.71. Press the buttons "1" and <9 "of the group CONTROL from CLA-
VIATURES of the TEMBROM CONTROL zone.

4.72. Press the leftmost key and, moving the
ku RANGE of the zone CONTROL` TONE, achieve
phenomena of low-frequency sound.

4.73. Pass the chromatic scale from left to right and remove
The fact is that the sound frequency increases proportionally ‘
as you play up on the keyboard.

4.74. Install handles RANGE, OST ROTA, DEPTH
TEMPER CONTROL zones to the “0” position. ,

4.75. Enter ATACL, ATTENUATION ручки control zones -
LOUD VOLUME to position "10". . ''

4.76. Set the level LEVEL knob
VOLUME to position "0".

4.77. Turn on the upper ON button. VOLUME zones
VOTES, UNISON.

4.78. Press any key and make sure that the volume
The sound gradually fades in and then fades away smoothly.

4.79. Turn on the FADE button.

4.80. Press any key and make sure that. the sound is floating
but growing and falling sharply.

4.81. Move ATTACK, ATTENUATION knobs to
“0”, and the LEVEL knob in position “10”.

4.82. Play the instrument by executing
some piece of music. You can turn on ‘
any. buttons and use any. control knobs, depending
bridges on the nature of the work performed. Loud pedal
During performance, it should not give jerks, and the sound volume
should decrease with releasing the end pedal (by ear).

CONTROL

17



PAGE 10

4.83. `One of the important qualities of EMC AELITA should be
nice, fairly soft keyboard. Do not attach large
effort when you press the key, especially since it takes hits on
him, as is done when playing the piano. Hand movements
should be smooth, soft. `(about.

4.84. The sound of the instrument must be checked in
a place where extraneous sounds do not penetrate.

4.85. If the instrument does not correspond to at least one of the paragraph -.

This tool is part of this manual. to be repaired.
4.86. Tool repair must be carried out in the following
telnosti.
in. Turn on all necessary devices according to their
m use.
In, Make sure that the power supply is working properly;
rive his exit stresses. If the weekend mismatch
Requirements must be checked radio
elements of appropriate rectifiers and stabilizers. You
replace failed elements. .

4.86.3. Make sure the low pass filter is working properly.
wife on the PF board. To do this, it is necessary to exit the instrument
That (volume pedal output) connect the oscilloscope. I connect
‘Read the sound generator to the input of the filter (PF, -contact 4). Float
by increasing the voltage at the output of the sound hepator from 0
up to 100mV, [= 1000 Hz, achieve a sine-wave output signal
amplitude up to 1 V.

Note. If the tool does not meet the requirements
Section 4.86.3, it is necessary to check the PF board
match the voltage map and not find
serviceability.

4.86.4. Make sure that the volume pedal is working properly. For
this you need to dial any timbre in to play on the instrument

those several times, pushing the pedal to failure. There is no

A sound, crackling, or jerking sound indicates a malfunction
either in the instrument, volume control, jacks |
pedals, or malfunctions of the pedal incandescent bulb. Nai
tn n troubleshoot |

4.86.5. When checking the tool according to paragraphs 4.2—4.81
Please note that:. _.

4.36.6.1. The sound of the key 1, 13, 25, 37 is formed on the floor
Those are the controls of the control panel, the tone board of the PT, the board of the PG generators.

4.86.5.2. Similarly, the sounds of the others are formed.
by the key.

4.86.5.3. When you turn on the buttons "2’ "," \ ›is formed

Y A with:
the sound of the entire keyboard in the following order: -
when you press 44 the key TO the days PU-U89, PU-90 _ ka
then closed at minus 0.7 V, respectively, the days PT-U57—

necessary

18.

connectivity.

- Dimo ​​adjust the corresponding generator:

_ my register sound and with the necessary

PT-Ub64 set the code to the memory block on the chips PT-51-PT-55,
and this code is fed into the Yanneynka dividers with a variable coefficient:
entom division, as a result of which the output line we have the necessary
required conversion number corresponding to the given note in the desired
octave. With the help of octave dividers PT-O! 3 -—- PT-015 n diodes.
PT-U02 — PT- \ 121 this selection is made. sheet music required.

: sound form (for
“2’ ”dividers PT-013, PT-214 will be disabled using`

circuit board circuit breakers and SP ... formed
on PT-017.4). Then the signal goes to the ’input of the filter board,
from the output of the filter — to the input of the amplifier and far — onto the pedal

volume. When you press the 43 key SI diodes PU-U87,
PU-U88 cathode closes at minus 0.7 V, respectively diodes
PT-U49— PT-U56 set their code to the block. numb In the future
signals pass similarly to the above.
emanates from all other keys. Prn turning on kiopkn

"XX" the sound is formed ‘on the PT-O16.1 chip—
PT-016.3. |

When you turn on the button p.
microcircuit PT-016.4.

“Unison sound is formed on the chip 'PT.O17.
Similar processes occur when the “4” buttons are turned on,
“8’ ”,“ 16 ’”, “32’ ”. Conduct the signals ‚registers and octaves
second and third votes.

4.86.6. Faulty smallpox. ‚Check with
testchra power supply +5 V. If there is power,. necessary
using an oscilloscope to verify the correct operation of each.
generator separately. To do this, the input of the oscilloscope
tea to the collectors. transistors PG- \ U4, PG-U7, PG-U9. 'If
there are no signals at these points, check for a short circuit
between the radio elements, is the foil torn, are they
transistors, if the inductors are not broken. Meisirav-
nye elements to replace. After replacing the transformer,

sound is formed on

4.86.7. Linear dividers with variable coefficients do not work
Ficheptis of division. Alternately connect the oscilloscope to the
moves of the K155TM2 multiplex circuits. The signal from each subsequent
stroke should have a frequency of sequencing two times less often-
you are the previous one. If on the edge of the oscilloscope and on any
there is no signal output, check whether the circuit
Comrade, tear foil or replace the appropriate chip.

4.86.8. Octave dividers do not work. Inspection and Repair
manufacture similarly to clause 4.86.7.

4.86.9. Does not work on the low-pass filter. Need to check pali-
signal at the input of the filter, at the input of the matching amplifier

19.


PAGE 11

Eveny filter with voltage-controlled amplifier input

. If there is no signal at the output of the matching amplifier,
then, it means that the previous cascade is faulty. Freeze
voltage on the mode map. Replace defective items.

Check also the voltage build-up on the control trans- °

. tori. In the absence of it, find the faulty element and
change.

’4.86.10. If the amplifier does not work, the voltage controlled
lowering, then it is necessary to check the signal sagging at the input
the amplifier output and the presence of a control signal on
‘Control transistor. The absence of singpal at the exit means-
it means that the previous cascade is faulty. Measure voltage by
map modes. Faulty elements to replace.

4.86.11. The amplitude envelope shaper does not work -
for a voltage controlled amplifier. In this case
check should begin with a positive difference
at the output of the PT-06.4 chip. In the absence of positive
potential at the output of the shaper, it is necessary to check
serviceability of transistors of formers. After checking the installation,
operability of electrolytic capacitors, diodes, trans
Of tori, check the modes on the voltage map. Faulty ele
cops to replace.

4.86.12. Amplitude Envelope Shaper Does Not Work
‘For the filter. Check and repair in the same way.
Clause 4.86.11.

4.86.13. The vibrato and tremolo generator does not work.

Using an oscilloscope, check for the presence of a pas-
the output of the PG-04.2 chip. There should be a rectangle-
signal.

On the eighth exit of PG-54.3 check the presence of a triangular
signal n signals of increasing and decreasing voltages. EU
if any signal is missing, check for short circuits
radio elements, are there any foil breaks on the board, and if there is no ”
Wii generation replace the chip.

Notes: |. Vibrato can be placed on any key. ”
5. Finding and eliminating irregularities
should lead in the order
they’ are listed in this section technique
4. about
3. To connect devices to individual
Stacks of printed circuit boards should use
tip with which you can
pierce the varnish
boards, and make contact with the printed circuit board
the one.
20

5. REPAIR. VOLUME PEDALS.

_ Repair the volume pedal as follows
sequences: _

5.1. Failures (venspravpy) photoresistors:

5.1.1. Release 4 screws. MZX 6, remove the bar. °

5.1.2. Remove the photoresistors, solder the leads, replace the
solder the leads and insert them into place.

5.2. To change a burned out lamp МН13,5 neobhodno pat-
Ron with a lamp shine from a square, turn the lamp out of the patrop,
screw in a new (obviously working) lamp in the socket and Insert

‚Him to the square.

5.3: In the presence of a strongly stretched spring that does not
provides хода of cartridges in the diaphragm (i.e. ®. film cassettes
sag), the springs should be replaced and repaired, for
this should be removed with a spring ”from the antennae of the crostein and from the cassettes
and replace with new ones.

5.4. In the absence of new ^ (workable) stretched
springs can be repaired. To do this, on a stretched bar
the jin should wear a mandrel the bottom of the bar, whose diameter is close

to the inner diameter are spring loaded. Tighten one spring horse
together with a bar of scissors, another kopek take a plier:
Mi and wind around the mandrels in the direction of embedding of the granddaughter. Behind*
thereby tighten the turn to turn and leave some vrs
me to get permanent deformation of the spring. After
to comply with the requirements of section 3.

6. REPAIR OF KEYBOARD ELEMENTS `

‚The repair of any keyboard elements begins to be removed -
s from the tool body. To do this, unscrew
screws connecting it to the tool body,

6.1.1. In the event of a drop in the pressure on the key as a result of
To loosen the spring, remove it with the pin
tseta and replace with a new one. °

6.1.2. In the event of a key breakdown, you must:

_ 6.1.2.1. Release key traction from. spring contact
boards.

6.1.2.2. "Remove the spring connecting the key to the comb
bases (see paragraph 4.86.1).

6.1.2.3. Remove the key from the base tab upwards`
(leave the other end in the initial position, holding it
hand).

6.1.2.4. Push the key forward from the connection with shock absorption,
torus.

6.1.3. In case of stretching of the spring contact during
work is needed.

. 2.


PAGE 12

6.1.3.1. Using the key, pull out all spring contacts,
installed on the same or malfunctioning.

6.1.3.2. Loosen the screws that connect the contact group to
the base of the keyboard and remove the contact group.

‚6.1.3.3. Loosen the three screws on the contact block.
ce, replace the faulty contact and assemble in the opposite
features. Put the contact group on the base, pre-
Insert spring contacts into the draft hole.

L. ADJUSTMENT AND SETUP

7.1. With proper installation and matching of the elements
electrical schematic
requires:

7.2. Frequency tuning of barking generators with
using a screwdriver dnlsttricheskoy 7810-0431 H12X! GOST
‚21010-75, rotating the cores of transformers and‘
resistors ‘of the corresponding generators at a frequency of 2794 Hz, sub-
By switching the electronic frequency meter to the EXIT jack. pa thunder pedals
bones n by pressing the FA key of the fourth octave (the first key
Visha on the keyboard} if the register “4” of the first goal is turned on
CA, while the regulators of the level of "2" and the third voice must
to be turned off. . °

The second and third geisrators are similarly configured.

8. TEST AFTER REPAIR

`8.1. After repair, Amy undergoes pa-work checks ”
ability to sound and correct settings.
8.2. After repair, the EMP is subjected to electric drive during
nie | h in all foreseeable operating modes.
Note. Check EMP by those parameters
which are associated with production repairs
Tom.

9. INSTRUCTIONS FOR REPLACING TRANSISTORS, KONDEN-
SATOR, VARIABLE RESISTORS

The following possible replacements are allowed:
1) transistors
KTZ102V on KTZ102D, KTZ42V,
KT3Z107V pa KTZ197D,
KT814V on KT816G,
KT815V on KT817G,
2) capacitors
K50-6-168V-2000 at K50-16-16V-2000 uF,
3) resistors
single SPZ-23Za for double the same face value.

‘22

_ Table? ''
DATA TRANSFORMER DATA

m —— ——— =

‚Winding- Brand and diameter Resistance-
The number of turns ‚. constant
ka wire current

|
1 1270 | | _ 0.23 = o

1030 ^ pEV-1 s

And 140 _ 0.41
140 pev-1 0.41

W 100 PEV-1 0.8
1,100 pev-g 0.18

E |



° Resistance values ​​may differ by = 20% from at
veperate.

Table 3
LABELING POWER TRANSFORMER



Withdrawal number | ° Color



Red
Blue
Green
Scoopy
Orange
White
Orange
Brown
Frozelovy

dz olmlvro'-

mch

83


PAGE 13

LIST OF ANNEXES MENTIONED B.
° INSTRUCTIONS

Appendix 2. Power supply. |

Appendix 3. Filter board.

_ Appendix 4. Generator board.

Appendix 5. Payment of tones. .

Appendix 6. Fee commutation.

Appendix 7. Management Board.

Order 460-1—84