Yamaha Electone GX-1 User manual

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INTRODUCTION |
This manual contains service information for the Synthesizer
Electone GX-1.
This model is the fully using sillicon transistors (NPN and PNP
type) and Integrated Circuits (and or LSI). Take special care to the
following points before making any service:
1) Check the main voltage and cycles of the organ and ascertain
if they are correctly adjusted to the electric power supply in
the area where the organ is used.
\f higher voltage is applied to the organ by mistake, transis-
tors and or ICs will be inevitable distroyed.
2) Correct voltage and polarity should be observed when using a
tester (VOM) in order to avoid damage to transistors, ICs and
FETs:
3) Turn the organ off during disassembly and parts replacement.
Recheck all work before applying power.
Transistors and ICs are very unforgiving and destruction is
immediate.
4) When replacing Integrated Circuit be very careful not to
apply excessive heat, proper heat sinking devices should be
used.
5) Before replacing an Integrated circuit, always disconnect its
output connections and recheck for a signal.

| INDEX
Page
GX-1. SPECIFICATIONS ...... mexgerG tipsike Coioman One, 001) palace ant, faery. Me 1
GX-1 CIRCUIT DIAGRAM & CIRCUIT BOARD
Contents:of- Girculit-Board:.........0. i. .%sknn «<>. ARISE AINA ATEN E SFP Ee 8
Unit Layout (1). scscscc cc rec catata ns tedeestetorene RON JNBOTSHIOE SBR US, Fo ee 16
MSIE LeaY OWE (2). coco sets. cence ts conc to sencsaeeiea cesta se te rece te tate SOP MES odie eet MEENDIONS, eT OR Ae
Block Glagram (Wpper). ........... 6c eee SI SRR BUR, & TT 18
Block Diagrany WOWwer): «.-.-.....-.sne tee. SRR TQ) UNA Se 19
Blocks Dirdgrarrn (POGal 5) sisi. si. .cscscocasnsan toasts ness cote te sete te +o UL IVE IBD. TA, PT 20
Block Tipe (5010) «.........-.-.-. on siedn wees JUS WRG SINUS JOU NAAL BY zt
Block Diagran (Rhythm) «.:.......4.ccciux, GPE SRENIDA nok, iin, AP 22
Block Bragram (Pres Ampi): ..:.:.-.ncccdescctocn:. PODIRBERS SINS? AOWENRDS. &. PN, 23
‘Terminal-Function ‘Table (Micircuit).-....... BAruy, JPetiENOA Dsl Magi. 27 rh 24
WM .(Master Generator): Circuit Diagram: «...7e 1670 Jes (plas 101 snetlal NGA. & 25
M:-.Girctiit.Board.,. Adjustment - ...:...i.-.0ccccccc-a. OU Ae IeaMRUIDA Sen RUM. ©. 26
MS .Cucit@Boardtiuyil.(bisodye7 Give aaF iOneN HRB AGS 2¢ anol ere). Mi 27
M-CircuiG Board.Witring (1) ......:..ccsciniseieeein.-.- ones TON BD Ne 2. 8228
Mi’ -Circuit-Board:Wiring (2) ...... RIBS Poss Pee bre. arotievO 707 feces T) 29
M.-Circuit:Board:Wiriag (3): -..: ..xc¢accecess.<. RI ASP REUIDA .IBOR HESS 30
M - Cireuit- Board: Wiring (4) 3s 0 cack Bice es. PORE THT) LORORIRYO, Oe! 31
M-GircuieBoard. Wiring (5) - .. <cenaccke teins nce re ei. BODEN, DIRQ MOMS. EE S2
BA (Complementary Buffer Amplifier) Circuit Diagram .............00000 eee 33
BA -Gircuit- Board: Wiring -.- 2 6. PSPS BU TE BSS I Oa, 34
KP (Key Voltage forPedal} Circuit’ Diagram as HF (S209 ING) SRBHIBN 35
KP ‘Gircuit-Board; Adjustment, WInh@ ation ©. PEI VES YS VOOR Bae TS L. 36
TEK (Touch Control, Expression and Knee Lever) Circuit Diagram ............. 37
FEK - Circuit Boar “Adjistment Wiring 22s vy ISS ic JOU NOY IGF SOT ISO UAITS S, 38
STR (Solo Key Transformation and Reverb) Circuit Diagram.......... eee ee 39
SER Circuit:Board; Adjustment, - Wiring’. «0.6 BESS ST RS OE. 40
SS (Solo Sub Oscillator) Circuit Diagram fetid 3 (GYR Tibi SOIT Seer, Fe 41
SS: Gircutt Board, Adjustment,Wiring:: «><... SWEIS FSiy | aneieerk Yeas Oe, 42
MOS (Modulation and Sub Oscillator) Circuit Diagram ........... 00.00 eee eee 43
MOS. Ciresut Board, Adjustment, Wiring: « «6% -..«. FORPTHRUBA, BISOS SHS otk 44

| INDEX
Page
PSM (Preset Tone Selection and Memory) Circuit Diagram ..............00005- 45
PSM Circuit Board; Wirlng.... 2... GAAOS THIGAIA 4 BAR DAM TRIN SF 46
RY “© (Rhyshi) Circuit, Diagram. 23 a... «aces ws ce IROL TOU). 10. at 47
RHY 1 Gircuit Board, Adjustment WIFING, ......0....c00000scecuceun 21) Teoved Tit 48
RHY 2 (Rhythm); Circute Diagram 2-3... ss on wea ses LU) Fue ve) See 49
RAY 2 Circuit Board, Witihd 3233 e ss ck ent c cuss GROUT mews Jan 50
RHY 3 (Rhythm) Circuit Diagram: cc... aes Se de eee? Set 51
RH Y. 3 Circuit Boards Wein se 6s. oes ics ie ek hae ob OO) Re aoe 52
RAY 4 CR Gira) Crete Dag ha 5. secs ses ce jose se cecegessseseseseo ee SONGUY REOSR aie 53
RHY 4 Circurt Board; Adjustment, Wiring, .............0.0..0.5... HIVE) ORE Maes 54
RAY 5 (RAY) CiIGUit Diagram, 5.5. <......5e cece eceteeseoe ss TE OAS) MaDe Seat 55
RHY 5 Circuit Boara; Adjustment, Wiring ........ Jsiucnio A eiiet. cocoa iscians 56
KS (Key. Voltage for Solo). Circuit. Diagram... .niciosiGi tina satszensd acea). i 57
KS Circuit Board, Adjustment, Wiring...................::...,[email protected]. Gastil. 58
SM (Preset Tone Selection and Memory for Solo Keyboard) Circuit Diagram ...... 59
SIME GIFU ERO ARC UIP sooo oc co ceecccccesececescsesecessiesiceucketee © Ee OG. et S 60
PB (Preset for Overtone and Buffer) Circuit Diagram ......... 0... ee eee 61
PB Circuit Board, Adjustment, Witing......,.............:.0.... 463 aoe Dee ea. f 62
OVT -(Overtone) Circuit Diagram: .:., <0... .....06..,..6.0.0:0:0,01 00 OB BEY OSD eens 63
ONT . Circuit Board WG oa ich ooh ce. orecelacecescjee DY De SO a. 64
SR (Solo Touch Response) Circuit Diagram & Circuit Board ................4. 65
TU,OV, WM,.R: Circutt Diagram & Circuit Board ............. auai@ hash. ond). & 66
TS (Variable Tone Module) Circuit Diagram & Circuit Board, Factory Setting
Tone Module Circuit Diagram & Circuit Beardik. -rracntowee .esed. <ieit). Fe 67
TV (Touch Vibrato) Circuit Diagram & Circuit Board,
BB (Buffer Amp. for Control Signal) Circuit Diagram & Circuit Board ........... 68
TSU, TEL,-TBP, TBS (Tone Send) Gicult Disgram apiesieieccs® och aid). AIO69
THU, TOL, TOP, TOS Wing —.-.. -. |. ai ares bcos 270
SH (Sample Hold) Circuit Diagram & Circuit Board ........... 0... eee eee eee 71
KAS (Key Assigner) Circuit Diagram . ..... ... onia¥t saad SOs ag teas S 72
KAS (Key Assigner) Circuit Diagram, Operation Out Line ................005. Ts
KAS Circuit Board; Adjustment 2. ..2...... anisiW snes’ . beaak coves) 28 74
WAS Gitcire Board Wing: cee a es es ee To

|
INDEX
|
: Page
Keyboard Gireihit Diagram (1). ............annws.. BIRO. Lust), Aatwe eels feitic 76
Keyboard Circurt Dragranu(2)QHS THRAMTeULOA bes BOM OANA SAR AMAR LS. 77
PNol (antec trGilcult:Diagrann (type ness. oe ee ones co oe es Owes 78
RN. FC 7) Ciecuit Diagram: (2) oc cccccs ce cc ecveseain FP]d SUS 79
PN: to (Panet eh) Circuit Diagrant (3) ss or. 6S Ow ates ene 80
PINo2 tamer) CHCUIUDIGgrant We ee. ck eS LO ee on ee ee 81
PINS Sfearteine ONCE OV AGhAITY (2) cise os cisco ake Sos a baie 0c eo ee eda renee 82
PN 2 (Panter neieane Diagrain (3) 0 esse es ene So oieee ele ee oe ety oe eee 83
PINES: (idle MCUINC DIGQNAINY ¢ cccte retry so ssi ns oe estan bos ves ols ces ae 84
PNG cane reGirCUlC DIdGIaIN 6 5 erten ok Gers ss Buea es Ses ewes 85
PNESetanien sy) GINCUIG DNagraIn (0) on cee es oe ss be sas wise eels oct ees 86
Plo aner oy Circuit Diagram (2) ca. ees Fea ow 6s iv oe vv oe oo 87
PIiiGarearel! 6) CiHouit Didgrany (1) cc. re iee S ee sv dw Pier es 88
PNig ei eanel'6) Circuit DiagramAZ)) ace ee sn ee sk EN tree re ee 89
Piveomranelo) Circuit Didgranl (a), ceccecs i. 6 oie sive cies cin so o ce neers ere eas 90
Elo ctrancio) Gircuit Diagranl (4)5= 2a 6c ee oa ete 0 ee 91
PING 7 (rave 7) CHTOUEE DIAGN aI IN coors race iis. Soc vse Wit oe a sue 9 otsasecaes 92
PN:S> (Panels) Circuit Diagram (1) sree orcs seine as Oe eee 93
RINGS = (Paniel’G) Ginette ©) gud (yy te ccc ks see ce sds se ee ee ees 94
PIneo-teanel 9) Gircurt Diagrane 2 eran ss cs Ss ao vis eve seeds vi ens ooo 95
Knee (Knee Lever) and Exp. (Expression) Circuit Diagram ...............005- 96
FG (Tone Cabinet Gonnector} Circuit Diagram... 0.65. is eee vb sa enna eee 97
Ponewoenn wont Circuit Diagrani (1) <a... 6 oc res ee oe bee ect wees ees 98
Sr eg 99
PU (Power Supply Unit) Circuit Board, Adjustment .. 2... cnc ie ve eee 100
Power Supply Unit Wiring (1) [General Spec.] ........ 0... cece eee eee eee 101
Power Supply Unit Wiring (2) [UL and CSA Spec.] ...............05. eet 102
Power Supply Unit Wiring (3) [North European Spec.] ..............4.. Fae tea 103
Power Supply Unit Wiring (4) [European and South African Spec.] ............ 104
Power Supply Unit Wiring (5) [Australian Spec.) ....... 0... cece eee eee 105
Power Supply Unit Wiring (6) [Japanese Spec.] ....... 0.0... cece eee eee ee 106
MB 1 (Mother Board) Circuit Diagram... Located below the rack ............ 107
MB 2 (Mother Board) Circuit Diagram... Located below the rack ............ 108

INDEX
t |
Page
initial Glear. Switch, CircuttiDiagram. 2... 0.0... nana Abd EE FRG beady 109
GX-1 GENERAL INSPECTION and ADJUSTMENT PROCEDURES ........... 110
GMT
PART
CISL
wns
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rccnctepns
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sso»
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Mapai
Meio
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111
NOTE: ABBREVIATIONS OF WIRE COLOR IN ELECTONE
BE BLACK BRiiiacac BAOQWN — RE =.) S500. RED OR Geer ORANGE
YG Soe VEUCEOW GR =k GREEN Erte BLUE NES cocker VIOLET
GY ee GRAY WE tc cts WHITE GG Aces GRASS GREEN SB ee SKY BLUE
PRs PINK TRS eecreer ces TRANSPARENT Ge eee TIN PLATED WIRE

Divisions
Master Oscillator
Tone Selectors
GX-1 (S/# 503
GX-1 SPECIFICATIONS
Upper Manual:
Lower Manual:
Pedals:
Solo Manual:
Portament Manual:
Upper Manual:
Lower Manual:
Pedals:
Solo Manual:
Upper Manual:
Lower Manual:
Pedal:
Solo Manual:
Preset Tone Module Numbers
Upper Manual:
Lower Manual:
Pedal:
Solo Manual:
Control Levers and Lever Switches
Pitch Bend:
Coupler:
Sustain:
61 Keys Cw~ca4
61-Keys C~ Cy
25 Keys Ci~c
37 Keys C1~ Ca
Ci~ C4
2 successions with 8 notes
—do.—
2 successions with one note
(In this case, two oscillators are used for the
second succession.)
One succession with one note
(Common-Portamento Key)
10
10
10
10
20 (Each module freely adjustable for any tone.)
20 ( —do.— )
20 ( —do.— )
10 ( —do.— )
Upper
Lower
Pedal
L to U
U tok
Eto P
S to U
Upper
Lower
Pedal

GX-1 (S/# 5030 ~ )
Over Tone: UpperI— 1,2, 4, 5,6, 8.
Il- 1,2,3,4, 7,8.
LowerI— 1,2,4,5,6,8.
IL +. t, 2, 3,4, 7,8.
Pedal I— 1/2, 1, 2, 5/2, 3, 4.
I-— 1/2, 1, 3/2, 2, 7/2, 4.
Solo — _ 1/8, 1/2, 1, 2, 4, 8.
Volume: Upper
Lower
Pedal
Brilliance: Upper
Lower
Pedal
Resonance: Upper
Lower
Pedal
Mixing: Upper
Lower
Pedal
Reverb: Upper and Lower
Solo
Total Volume
Manual Balance

GX-1 (S/# 503
Solo section
Solo Control Levers and Levers Switches
Sample/Hold: Rhythm Pattern Selector Switch
(SPREB, MA, HH, CY1, CY2, BD, LC, HG, BO)
VCF
VCO
Sample/Hold Switch
Sample Indicator Lamp
Ring Modulator: Oscillator Level
Oscillator Speed
Solo Keyboard
Noise Level
Noise Color
Normal and Modurated Signal Mixing Lever
Envelope: Attack Time
Sustain
Pitch Envelope: Initial Pitch
First Decay
Second Decay
Final Pitch
Sub Oscillator: Function
. Speed
VCA
VGF
VCO
Solo Portament
Knee Lever Control: Solo Keyboard Portament Switch

GX-1 (S/# 5030~ )
Solo Touch Response:
Upper Sub Controler
Upper Touch Responce:
Random Signal:
(noise)
Sub Oscillator:
Knee Control Switch:
First Touch
Attack Time
Initial Pitch
Second Touch
Pitch
Brilliance
Volume
Sub Oscillator Speed
VCO
VCF
VCA
Third Touch
Vibrato
Wah Wah
Resonance
Third Touch
Vibrato
Wah Wah
Resonance
VCF
VCO
Color
Function
Speed
VCA
VGF
VCO
Solo Keyboard Switch
Upper Portament
Upper Sustain
Sub Oscillator VCO
VCF
VCA
Speed

Upper Portament
Lower Sub Controler
Sub Oscillator:
Knee Control Switch:
Foot Switch Control Selector
Others
Solo Keyboard
Function
Speed
VCA
VCF
VCO
Lower Sustain
Sub Oscillator VCO
VGE
VCA
Speed
Upper Sub Oscillator Cancel
Lower Sub Oscillator Cancel
Rhythm Stop
Solo Portament
Upper Portament
Tuning:
Wave Motion:
Over Tone Preset Button:
Upper
Lower
Pedal
Solo
Upper
Lower
Pedal II
Pedal II’
1, 2,3,4,C
GX-1 (S/ # 503

GX-1 (S/# 5030~ )
Over Tone Preset Selector Switch: 1 Upper If
II
Lower I
II
Pedal I
II
2 Upper I
II
Lower I
II
Pedal _ I
II
3..eUpper I
II
Lower I
II
Pedal I
II
Expression Dynamic Compressor: Upper
Lower
Pedal
Solo
Rhythm
Expression Pedal
Expression Switch
Knee Lever
Auto Rhythm 14 Rhythm 3 Variations
Rhythm Selector: March I, March II, Swing, Waltz, Slow Rock, Jazz Rock I,
Jazz Rock II, Tango, Beguine, Rumba, Mambo,
Bossa Nova, Samba I, Samba II.
Variation: A, B.
Imarge Controler
Tempo
Swinger
Volume
Balance

GX-1 (S/# 503¢
Start
Synchro Start
Tempo Lamp
Power Consumption
420W
100V
125V
110V
220V
117V
=
240V
Dimensions
GX-1
Width:
1,600
mm
Height:
1,135
mm
Depth:
800
mm
Weight:
300
kg
Bench:
Width:
1,455
mm
Height:
666
mm
Depth:
660
mm
Weight:
60
kg
Pedal Keyboard: Weight 27 kg

GX-1 (S/# 5031
GX-1 CIRCUIT DIAGRAM & CIRCUIT BOARD

GX-1 (S/# 5030 ~ )
Contents of Circuit Board
Circuit Board © Contents Location
MU, ML * Voltage Controled Oscillator (VCOIIL) on the Rack
MP, MS * Pitch Control Circuit for Voltage Controled
Oscillator
* Wave Shaping Converter (W S C Module)
* Wave Shaping Converter and Doubler
(by discrete system)
* Band Pass Filter (Fixed)
* High Pass Filter (Fixed)
* Sound Source Signal (Wave form) Selector Gate
Switching Circuit by FET Gate
* Sound Source Signal (Wave form) Selector
Voltage Control Amplifier
(Signal level can be chosen
continuously.)
* Preamplifier
* High Pass Filter (Voltage Controled Filter)
* Low Pass Filter (Voltage Controled Filter)
* Voltage Controled Amplifier (Controled by
Envelope Generator)
*
Voltage
Controled
Amplifier
for
Level
Setting
* Envelope Generator for Voltage Controled Filter
* Envelope Generator for Voltage Controled Amplifier

GX-1 (S/# 5030 ~ )
Contents of Circuit Board
Circuit Board
Contents
Location
KAS
(KAU
KAL)
* Key Corder
* Key Assigner
* Clock Oscillator
* Octave Ladder Gate
* Note Ladder Gate
* 8 Channel Division Gate
* 8 Channel Timing circuit
* Voltage ¢ ollower circuit
* UK Portament circuit
* QOut-Put Voltage Buffer circuit
* Initial Clear circuit
* IC Power Supply circuit
on the Keybed
K P
* Ladder Network for Key Voltage
* Gate Circuit for Gate Circuit
* Buffer Amplifier for Key Voltage
* Gate Keying Circuit for MP Circuit Control
* Key Voltage Follower Circuit
on the Rack
aK
* First Touch Detector
* Second Touch Detector
* Voltage Controled Amplifier for Solo Signal which
controled by Second Touch Detected Signal.
* Voltage Controled Amplifier for Solo Sub Oscillator
Control which controled by Second Touch Detected
Signal
* Third Touch Detector
* Knee Lever Detector
*.Voltage Controled Amplifier for UK Sub Oscillator
which cont oled by Knee Lever Detected Signal
* Voltage Controled Amplifier for LK Sub Oscillator
on the Rack

Gx-1 (S/# 5030 ~ |
Contents of Circuit Board
Circuit Board
Contents
Location
TEK
which controled by Knee Lever Detected Signal
* Expression Detector
* Expression Circuit
* Dynamic Range Control Circuit
* Tone Cabinet Selector and Total Volume Control
Circuit
* The Amplifier for Output
on the Rack
STR
* UK Signal Preamplifier (2 Amplifiers)
- ox —do.—
* SK —do.—
"Pr. —do.— (one amplifier)
* UK and LK Reverb Signal Pick Up Amplifier
“* SK Reverb Signal Driving Amplifier
* SK Reverb Signal Pick Up Amplifier
* SK Key Voltage Converter (Lenear Voltage to
Logarithm Voltage)
on the Rack
Ss
* Random Noise Generator (for Ring Modulator)
* Portamento Precedence Circuit
(Portamento Keyboard Precede to Solo Keyboard)
* Portamento Key Voltage Delay Circuit
* Solo Sub Oscillator (VCOI)
* Waveform Converter for Solo Sub Oscillator
* Oscillator (VCOI) for Ring Modulator
* Ring Modulator
on the Rack

GX-1 (S/# 5030~ )
Contents of Circuit Board
Circuit Board
Contents
Location
PSM
* One Preset Tone Selector Button
Selection and Precedence Circuit
(2 channels, 2 circuits)
* 10.6V DC Supply Control Circuit....... 20
* Lamp in the Preset Tone Selector Button Driving
Circuit
on the Rack
MOS
* UK and LK Reverb Signal Driving Amplifier
* Oscillator for Pulse Width Modulation
* Pulse Width Modulation Gate
* Sub Oscillator for UK
* Waveform Converter for UK Sub Oscillator
* LK Sub Oscillator
* Waveform Converter for LK Sub Oscillator
* Random Noise Generator (for UK)
on the Rack
RHY 1 * Tempo Clock Oscillator on Auto Rhythm
* Comparator for Swinger (7 circuits)
* Basic Voltage Circuit for Swinger
* Counter for Clock Pulse
* Counter for Waltz and 5 measure
* Up Beat Producing Circuit
* Down and Up Beat Control Circuit
* Rhythm Stop with Foot Switch Operation Circuit
on the Rack

GX-1 (S/ # 5030 ~
Contents of Circuit Board
Circuit Board Contents Location
RHY 1 * Synchro Start Operation Circuit on the Rack
* Rhythm Lamp Driving Circuit
* Timing Selection Circuit for Lamp Driving Pulse
RHY 2 * Up Beat Matrix Circuit on the Rack
* Rhythm Variation Selector Circuit
RHY 3 * Down Beat Matrix Circuit on the Rack
* Rhythm Variation Selector Circuit
RHY 4 * Rhythm Sound Source Circuit, Oscillator System on the Rack
Bass Drum (Long), Bass Drum (Short),
Conga (Low), Conga (High), Bongo (High),
Claves, Cowbell, Rim Shot
* Four Pre-amplifiers for Auto Rhythm
RHY 5 * White Noise Generator for Rhythm Sound Source on the Rack
and UK, LK, PK and SK Sound Source
* Oscillation Noise Generator for Rhythm Sound
Source
* White Noise Signal Gate for Sound Source in
M Circuit
* Rhythm Sound Source, Noise System
Cymbal 1, Cymbal 2, High Hat, Snare Drum

GX-1 (S/# 5030 ~ )
Contents of Circuit Board
Circuit Board Contents
Location
‘KS
* Key Voltage Ladder Network
* Key Voltage Gate Circuit
* Key Voltage Buffer Circuit
* Tuning Control Circuit for Portamento Keyboard
on the Panel 2
SM
* One Preset Tone Selector Button Selection and
Memory Circuit (One channel 10 pcs.)
* 10.6V DC Supply Control Circuit
* Lamp in the Preset Tone Button Driving Circuit
on the Keybed
PB
* UK Sub Oscillator Signal Buffer Amplifier for VCO
in M Circuit Board
* UK Sub Oscillator Signal Buffer Amplifier for VCF
in M Circuit Board
* UK Sub Oscillator Signal Buffer Amplifier for VCA
in M Circuit Board
* LK Sub Oscillator Signal Buffer Amplifier for VCO
in M Circuit Board
* LK Sub Oscillator Signal Buffer Amplifier for VCF
in M Circuit Board
* LK Sub Oscillator Signal Buffer Amplifier for VCA
in M Circuit Board
* UK Sub Oscillator Cancel Circuit with Foot Switch
* LK Sub Oscillator Cancel Circuit with Foot Switch
* Buffer Amplifier for Panel Effect Levers
(15 circuits)
* Single Preset Tone Button Selection and Memory
Circuit for Overtone
on the Keybed