Roland SH-5 Operating and maintenance manual

WPW.
MANUAL MANOR
SH-5
Service Notes
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! CONTENTS
1. SPECIFICATIONS 3
2. FRONT PANEL 4
3. ASSEMBLY DESCRIPTION 5
3-1 Keyboard Unit Assembly K3-1 5
3-2 Control Unit Assembly CU-1 5
3-3 Sub Chassis Unit Assembly SU-1 7
3-4 Power Supply Unit Assembly PC-5 7
4. GENERAL CAUTIONS 8
5. GENERAL BLOCK DIAGRAM , 9
6. CABINET DISASSEMBLY 10
7. WIRING BLOCK DIAGRAM 11
8. KEYBOARD UNIT ASSEMBLY KB-1 11
, 8-1 Keyboard Assembly SK-142B 11
8-2 Bender Assembly PB-1 11
8-3 Control Unit Assembly CU-2 12
8-4 Manual Board Assembly OP-25 12
1 8-5 Circuit Diagram KB-1 13
9. CONTROL UNIT ASSEMBLY CU-1 14
9-1 Circuit Diagram CU-1 16
9-2 Circuit Board Assembly OP-19 18
9-3 Circuit Diagram OP-19 (±10V, Phones, LFO-1, LFO-2, S/H, Noise Gen.) 19
9-4 VCO Board Assembly VO-3 20
9-5 Circuit Diagram VO-3 (VCO-1) 21
9-6 Circuit Board Assembly OP-20 22
9-7 Circuit Diagram OP-20 (VCO-2, Ring Mod) 23
9-8 Mixer Board Assembly OP-23 24
9-9 Circuit Diagram OP-23 (Mixer, Ext. Amp.) 25
9-10 Circuit Board Assembly OP-21 26
9-11 Circuit Diagram OP-21 (VCF, VCA, BPF) 27
9-12 Circuit Board Assembly OP-22 28
9-13 Circuit Diagram OP-22 (AR, ADSR, Fixed Env. Lamp.) 29
10. SUB CHASSIS UNIT ASSEMBLY SU-1 30
10-1 Circuit Diagram SU-1 31
11. POWER SUPPLY UNIT ASSEMBLY PC-5 32
11-1 Circuit Diagram PC-5 32
11-2 Power Supply Board Assembly PS-17 33
11-3 Power Supply Board Assembly PS-23 33
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1976-10-30 SH-5
12. ADJUSTMENT 34
12-1 PS-17, PS-23 .. 34
12-1-1 +14V, -14V 34
12-2 OP-19 34
12-2-1 +10V, -10V 34
12-2-2 LFO-1 34
12-2-3 SAMPLE & HOLD 35
12-2-4 NOISE, GENERATOR 36
12-3 K3-1 36
12-3-1 KEY VOLTAGE 36
12-3-2 BENDER VOLTAGE 37
12-4 VO-3 37
12-4-1 VCO RANGE SET 37
12-4-2 VCO-1 37
12-4-3 VCO-1 38
12-4-4 VCO-1 FREQUENCY WIDTH 38
12-4-5 VCO-1 FREQUENCY ADJUSTMENT 41
12-5 OP-20 41
12-5-1 VCO-2 41
12-5-2 VCO-2 41
12-5-3 VCO-2 FREQUENCY WIDTH 42
12-5-4 VCO-2 FREQUENCY ADJUSTMENT 42
12-5-5 RING MOD 43
12-6 OP-21 44
12-6-1 VCA 44
12-6-2 VCF 45
12-7 OP-22 48
12-7-1 ADSR 48
13. PARTS LIST 49
13-1 OP-25 49
13-2 OP-19 49
13-3 VO-3 50
13-4 OP-20 51
13-5 OP-23 52
13-6 OP-21 52
13-7 OP-22 53
13-8 PS-17 53
13-9 PS-23 54
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I
1. SPECIFICATIONS
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2. FRONT PANEL
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3. DESCRIPTION OF ASSEMBLIES
The MODEL SH-5 consists of 4 main units shown below in order of disassembly procedure.
1) KEYBOARD UNIT ASSEMBLY KB-1
2) CONTROL UNIT ASSEMBLY CU-1
3) SUB CHASSIS UNIT ASSEMBLY SU-1
4) POWER SUPPLY UNIT ASSEMBLY PC-5
3-1. KEYBOARD UNIT ASSEMBLY KB-1
This unit is subdivided into smaller blocks:
1) KEYBOARD ASSEMBLY SK-142B
2) CONTROL UNIT ASSEMBLY CU-2
MANUAL BOARD ASSEMBLY OP-25
BENDER ASSEMBLY PB-1
A. Keyboard Circuit
Consists of a constant current source fed to the keyboard resistors which provids specific voltage drops when
keyboard keys are pressed.
This voltage is fed to an S & H Circuit where it is held until another voltage is produced by depressing another key.
The output of this circuit is used for controlling the VCO's and VCF.
A second circuit generates trigger-pulses by means of the ON-OFF manuals under the keys for control of
triggering LFO-1, LFO-2, S/H, and ENV GEN.
B. TUNING, TRANSPOSE, PORTAMENTO
Each controls 2 VCO's simultaneously.
C. BENDER
The voltage output is variable from + to -, and the circuit is for the control of VCO's or VCF, selected with a
switch.
In the VCO mode, there are further selections of 3 ranges: SEMI - WHOLE - QUINT.
Setting the slide switch on VCF, the starting tone color of the bender effect can be changed by moving the CUT
OFF FREQ. control in the VCF section.
3-2. CONTROL UNIT ASSEMBLY CU-1
Subdivided as follows:
1) CIRCUIT BOARD ASSEMBLY OP-19
2) VCO BOARD ASSEMBLY VO-3
3) CIRCUIT BOARD ASSEMBLY OP-20
4) MIXER BOARD ASSEMBLY OP-23
5) CIRCUIT BOARD ASSEMBLY OP-21
6) CIRCUIT BOARD ASSEMBLY OP-22
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3-2-1. CIRCUIT BOARD ASSEMBLY OP-19
Contains: ±10V Regulator, PHONES, LFO-1, LFO-2, S/H, and NOISE GEN, circuits.
A. ±10V Regulator
The constant voltages +14V and -14V of the input are converted into highly stable D.C outputs: +10.00V and
-10.00V.
Generally speaking, the more accurate the adjustment (the more zeroes after the decimal point) the more
accurate the VCO tracking will be.
B. PHONES
Controls the LEVEL without any relat/on to the OUTPUT LEVEL of VCA.
C. LFO-1
This is a Low Frequency Oscillator to produce both inverted and non-inverted Sawtooth waveforms with a phase
difference of 180°.
D. LFO-2
Produces Sine wave, Square wave (inverted and non-inverted), and Triangular wave for use in modulation, and
TRIG, for AR. and ADSR.
DELAY TIME utilizes Sine wave alone.
E.S/H
This circuit is for sampling voltages from different waveforms, using LFO-1 ( |)j^ ), LFO-2 ( AA ), and
RANDOM (NOISE) for its input source. The output can be used to control VCO-1 and the VCF for getting
special effects.
Sample time decides the timing of the sampling operation.
Lag time uses an RC filter to add lag to quick voltage changes.
F. NOISE GEN.
The sound source here is the white noise produced at the B-E (base — emitter) junction of a reverse biased
transistor.
It is amplified and, through filtering, is changed to either WHITE or PINK at the output.
3-2-2. VCO BOARD ASSEMBLY
VCO-1
A VCO is an oscillator whose frequency is controlled by a control voltage coming from the Keyboard or other
external sources.
Incoming linear control voltages are first converted into voltages with an exponential increasing ratio.
The oscillator itself is a sawtooth generator. Wave shapers convert this sawtooth to triangle and square waves.
This assembly functions as VCO-1, and is capable of synchronous driving of VCO-2 by means of the synchronizing
pulses generated in this assembly.
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3-2-3. CIRCUIT BOARD ASSEMBLY OP-20
VCO-2, RING MOD.
VCO-2 is an oscillator which is about the same as VCO-1.
With the Keyfollower turned to OFF, the frequencies generated here are held at a constant level and not subject to
follow the keyboard.
RING MOD. (ring modulator) is a circuit for producing sounds of special effect, such as bell-like sounds. The sum
and difference of the two input frequencies are the only frequencies to appear at the output of the ring modulator.
3-2-4. MIXER BOARD ASSEMBLY OP-23
This is the section that decides where the signals coming from NOISE GEN., VCO-1, VCO-2, RING MOD., EXT. IN.
will go.
Also provided here is an amplifier circuit for the signals of EXT. IN.
3-2-5. CIRCUIT BOARD ASSEMBLY OP-21
VCF, BAND PASS FILTER, VCA
The VCF is a Voltage Controlled Filter and can be used either as: LPF, BPF, and HPF.
The LPF consists of a ladder type network of diode chain transistors, and is capable of generating by itself fre
quencies of a wide range so that it can be used to make musical scales following the keyboard manuals.
Band Pass Filter is, unlike the others, a fixed filter and not voltage controlled.
The VCA has its gain under control of the control voltage applied to the base of the current source transistor in this
circuit.
3-2-6. CIRCUIT BOARD ASSEMBLY OP-22
AR, ADSR, FIXED ENV.
The Envelope Generators have separate controls for controlling the elements of the envelopes (ATTACK and
RELEASE for the AR, and ATTACK, DECAY, SUSTAIN:, and RELEASE for the ADSR). The Envelope Generators
are triggered from the Keyboard Circuit gate pulses or from LFO-2, S/H, or EXT.
The FIXED ENV, however, is triggered only by the keyboard gate pulse.
3-3. SUB CHASSIS UNIT ASSEMBLY SU-1 (Including Pack Assembly BX-13)
Located here are the output jacks of SH-5, also with jacks for control from external sources.
3-4. POWER SUPPLY UNIT ASSEMBLY PC-5
This is to produce the regulated ±14V and in order to secure voltage accuracy, potentiometers are provided in this
circuit.
Note that PS-17 is for 100 - 120V, while PS-23 is for 200 - 250V.
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1976-10-30 SH-5
4. GENERAL CAUTIONS
4-1. Fuses
When replacing fuses, use only those rated as shown on the caution label on the circuit board.
Repeatedly blown fuses indicate something wrong with the circuits. Using larger value fuses will only aggravate
this condition and will result in damage to the circuits.
4-2. Adjustment
Calibration adjustments should be done in the order given.
Accurate adjustment can be assured only if the procedures are followed exactly as given.
4-3. Slide Switch
Double check the positions of slide switches.
Slide switches set in between positions is the largest cause of malfunction of this synthesizer.
4-4. Replacement of parts
Use only those as specified in the Parts List.
Use of parts other than as specified can cause function instability or circuit damage.
-8-
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1976-10-30 SH-5
5. GENERAL BLOCK DIAGRAM
HOLD
PORTAMENTO
VARIABLE
OFF
FIXED
TRIG.
CIRCUIT
BENDER
VCO
SEMI
WHOLE
QUINT
VCF
TUNE
TRANSPOSE
L-M-H
CONTROLLERS
COMPUTAR
or
SEQUENCER
KYBD«NOTE
TO VCO
TO VCF
SYNC
OUT
RANGE —
2.4.8.
16.32
PITCH —
OSC
WAVE
FORM
AAN\
runu
u
VOLT.
CONT
II MOD. —J
MANUAL
VCO-1
PULSE
WIDTH
MOD.
ENVELOPE GEN.
ADSR
KYBD FOlPw
ON/OFF
RANGE
2.4.8. —
16.32
PITCH -
MOD. -J
WAVE
FORM
J
VOLT.
CONT
WIDTH I—I
MOD.
vco-J
RING
MOO.
EXT. IN
JACK
AUDIO
ORGAN: H
GUITAR: M
.MIC: L
VCO-1
LEVEL
VCO-2
LEVEL
RING
MOD. -
LEVEL
VCF
VCF+ BPF
BPF
VCA
EXT. IN
LEVEL
NOISE LEVEL
MIXER
EXPRESSION
PEDAL CONT.
FREQ
RESONANCE
LEVEL •
VCF
CONT.
JACK
HPF
BPF-
LPF
RESONANCE
II
CUT OFF _
FREQ.
\ MOD. —
VOLT.
CONT
VCF
PANNING
VOLT.
CONT
AR
ADSR '
VCA
OUT
LEVEL
PHONES
MONO
OUT
STEREO
OUT
L-R
ADSR. AR, FIXED ENV.
-9-
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