Roland Boss GT-6 Operating and maintenance manual

Copyright © 2002 ROLAND CORPORATION
All rights reserved. No part of this publication may be reproduced in any form without the written permission
of ROLAND CORPORATION.
Printed in Japan (0800) (CM)
17058013E0
Sep. 2001 GT-6(T)
SERVICE NOTES
First Edition
Issued by RJA
Guitar Effects Processor
TABLE OF CONTENTS
TABLE OF CONTENTS ...................................................1
SPECIFICATIONS.............................................................2
LOCATION OF CONTROLS PARTS LIST ...................4
LOCATION OF CONTROLS ..........................................4
EXPLODED VIEW PARTS LIST.....................................6
EXPLODED VIEW............................................................6
WIRING DIAGRAM.........................................................8
PARTS LIST........................................................................9
IDENTIFYING THE VERSION NUMBER..................14
TRANSMITTING / RECEIVING DATA
VIA MIDI..........................................................................14
BULK DUMP ...................................................................14
BULK LOAD....................................................................14
TEST MODE.....................................................................14
RESTORING THE FACTORY SETTINGS
(FACTORY RESET).........................................................19
HOW TO UPDATE SYSTEM SOFTWARE .................19
BLOCK DIAGRAM.........................................................21
CIRCUIT BOARD (MAIN) ............................................22
CIRCUIT BOARD (MAIN) ............................................24
CIRCUIT DIAGRAM (MAIN 1/2) ...............................26
CIRCUIT DIAGRAM (MAIN 2/2) ...............................28
CIRCUIT BOARD (SW SHEET)....................................30
CIRCUIT DIAGRAM (SW SHEET) ..............................32
ERROR MESSAGE..........................................................34

2
Sep. 2001
SPECIFICATIONS
GT-6: Guitar Effects Processor
• AD Conversion
24 bit + AF method
• DA Conversion
24 bit
• Sampling Frequency
44.1 kHz
• Program Memories
340: 140 (User) + 200 (Preset)
• Nominal Input Level
INPUT: -10 dBu
RETURN: -10 dBu
• Input Impedance
INPUT: 1 M ohms
RETURN: 220 k ohms
• Nominal Output Level
OUTPUT: 0 dBu
SEND: -10 dBu
• Output Impedance
OUTPUT: 2 k ohms
SEND: 2 k ohms
• Digital Output
EIAJ CP1201, S/P DIF
• Dynamic Range
100 dB or greater (IHF-A)
• Controls
< Front Panel >
(PREAMP/SPEAKER)
TYPE knob
GAIN knob
BASS knob
MIDDLE knob
TREBLE knob
LEVEL knob
SPEAKER knob
On/Off button
TYPE VARIATION button
(OVERDRIVE/DISTORTION)
TYPE knob
DRIVE knob
LEVEL knob
On/Off button
TYPE VARIATION button
(DELAY)
FEEDBACK knob
LEVEL knob
On/Off button
TAP button
(CHORUS)
LEVEL knob
On/Off button
(REVERB)
LEVEL knob
On/Off button
(WAH)
On/Off button
(EQ)
On/Off button
(FX-1)
On/Off button
(FX-2)
On/Off button
(MASTER)
PATCH LEVEL knob
PARAMETER buttons L/R
EXIT button
WRITE button
EZ TONE button
PEDAL ASSIGN button
OUTPUT SELECT button
TUNER/BYPASS button
NAME/NS/MASTER button
UTILITY button
MANUAL button
Number pedals1-4
BANK pedals (Up/Down)
CTL pedal
Expression pedal
Expression pedal switch
PATCH/VALUE dial
< Rear Panel >
OUTPUT LEVEL knob
POWER switch
Display
16 characters, 2 lines (backlit LCD)
2 characters, 7 segment LED
Connectors
INPUT jack
OUTPUT jacks L (MONO)/R
PHONES jack
SEND jack
RETURN jack
DIGITAL OUT connector (coaxial)
SUB EXP PEDAL/SUB CTL PEDAL1,2 jack
MIDI connectors IN/OUT
AC Adaptor jack
• Power Supply
AC 14 V; Supply AC adaptor (BOSS BRC series)
• Current Draw
800 mA
• Dimensions
515 (W) x 261 (D) x 75 (H) mm
20-5/16 (W) x 10-5/16 (D) x 3 (H) inches
• Weight
4.7 kg/10 lbs 6 oz (excluding AC Adaptor)
• Accessories
Owner’s Manual English (#G6017298)
AC Adaptor BRC-120V (#01786223)
AC Adaptor BRC-230V (#01786234)
AC Adaptor BRC-240V (#01786245)
EURO CONVERTER PLUG ECP01-5A (PLUG for 230V) (#00905234)
• Options
MIDI Implementation English (#17041119)
Foot Switch: FS-5U, FS-5L
Expression Pedal: EV-5 (Roland), FV-300L + PCS-33 (Roland)
Foot Switch Cable: PCS-31 (Roland)
(1/4 inches Phone Plug (stereo) - 1/4 inches Phone Plug (mono) x 2)
* 0 dBu = 0.775 Vrms
* In the interest of product improvement, the specifications and/or appearance of
this unit are subject to change without prior notice.

3
GT-6(T)

Sep. 2001 GT-6(T)
LOCATION OF CONTROLS
PARTS LIST
LOCATION OF CONTROLS
fig.panel
No. Part Code Part Name Q’ty
1 G2477122 R-KNOB 15
2 F3279803 POTENTIOMETER RD901-40-125F-
B54-11D (11 click) 1
3 F3279804 POTENTIOMETER RD901-40-125F-
B54-06D (6 click) 2
4 F3279802 POTENTIOMETER RD901-40-125F-
B54-00D 12
5 G2237113 GUARD PLATE 1
6 G2237112 GUARD 1
7 G2017152 TOP COVER 1
8 F5029412 LED (RED) A-552SR BW 1
9 F5029405 LMC-SSC2K16DLNY-H01 1
10 G2567119 DISPLAY COVER 1
11 22485303 D R-KNOB L BLK 248-303 1
12 01905467 ROTARY ENCODER EVE GC1 F20
24B 1
13 G2567118 ESCUTCEON (for PANEL) 1
14 G247751301 KEYTOP S WITHOUT LENS 4
15 G247751001 KEYTOP S BLACK WITH LENS 19
16 F5029111 LED (RED/GREEN) L-3WSRSGW-
CC 2
17 F5029117 LED (RED) L-312LRD 17
18 1502928100 LED (RED) L-34HDSL 8
19 01780101 TACT SWITCH SKQKAB 23
20 G2217138 PEDAL LABEL(1) 1
21 G2217139 PEDAL LABEL(2) 1
22 G2217140 PEDAL LABEL(3) 1
23 G2217143 PEDAL LABEL(4) 1
24 G2217144 PEDAL LABEL(CTL) 1
25 G2217142 PEDAL LABEL(DOWN) 1
26 G2217141 PEDAL LABEL(UP) 1
27 G2357112 VR PLATE 1
28 G2567121 RUBBER SW ESCUTCHEON 1
29 G2567120 RUBBER SW 1
30 G2187533 VR PEDAL 1
31 G2187904 PEDAL HOLDER 1
32 01016167 11M/M ROTARY POT.
RK11K1140(10K SP B) 1
33 G2357111 CUSHION R 1
34 G2147117 PIN STAY 1
35 G2147119 BOLT HOLDER 2
36 G2357120 FOOT H=5 5
37 G2147116 SHAFT STAY 1
38 G2227301 PEDAL ESCUTCHEON 7
39 G2187602 SWITCH PEDAL 7
40 G2177103 SUPPORT SPRING 7
41 G2357109 PEDAL FOOT 7
42 13129778 TACT SWITCH SKQKAH 7
43 G2017150 BOTTOM COVER 1
44 13449155MF PHONE JACK (MONO) HTJ-064-12I 5
45 13449150MF PHONE JACK (STEREO) HTJ-064-
12D 2
46 01340412 P R-KNOB SF-A BLK/LCG 1
47 01676523 9M/M ROTARY POT. RK09K12A0
10KAX2 1
48 01343723 RCA(PIN) JACK YKC21-3117 1
49 13429825 MIDI CONNECTOR YKF51-5054 1
50 12499175 G S-BUTTON S1H BLK 1
51 01676512 PUSH SWITCH SDKLA1-B 1
52 13449728 ADAPTOR JACK HEC0740-010010 1
53 22360712 CORD HOOK 236-712 1
1.2.
1.3. 1.4.
5.
6. 7. 8. 9.
10. 1.3. 11.12.13.
14.19.
15.17.19.
18.
18.
25. 26. 27. 28.29. 30.31.32.33.
34.35.37.
39.40.41.42
38.
20. 21. 22. 23. 24.
36.43. 44.
45.
46.47.
48. 49.
50.51.
52.
53.
15.16.19.
54

Sep. 2001 GT-6(T)
EXPLODED VIEW PARTS LIST EXPLODED VIEW
fig.jack
[Parts]
No. Part Code Part Name
1 G2017152 TOP COVER
2 G2017150 BOTTOM COVER
3 G2237112 GUARD
4 G2237113 GUARD PLATE
5 G2567120 RUBBER SW
6 G2567121 RUBBER SW ESCUTCHEON
7 G2357120 FOOT H=5
8 G2567119 DISPLAY COVER
9 12499175 G S-BUTTON S1H BLK
10 22485303 D R-KNOB L BLK
11 01340412 P R-KNOB SF-A BLK/LCG
12 22360712 CORD HOOK 236-712
13 G2217138 PEDAL LABEL(1)
14 G2217139 PEDAL LABEL(2)
15 G2217140 PEDAL LABEL(3)
16 G2217143 PEDAL LABEL(4)
17 G2217144 PEDAL LABEL(CTL)
18 G2217141 PEDAL LABEL(UP)
19 G2217142 PEDAL LABEL(DOWN)
20 G247751001 KEYTOP S BLACK WITH LENS
21 G247751301 KEYTOP S WITHOUT LENS
22 G2147116 SHAFT STAY
23 G2477122 R-KNOB
24 G2567118 ESCUTCEON (ABS,for PANEL)
25 G2227301 PEDAL ESCUTCHEON
26 G2187602 SWITCH PEDAL
27 G2177103 SUPPORT SPRING
28 G2357109 PEDAL FOOT
29 G2187904 PEDAL HOLDER
30 G2187533 VR PEDAL
31 G2357111 CUSHION R
32 G2147117 PIN STAY
33 G2357112 VR PLATE
34 F5029405 LCD
35 75D523S000 SW1 BOARD
36 75D523S000 SW2 BOARD
37 75D523S000 SW3 BOARD
38 75D523M000 MAIN BOARD
39 75D523S000 SW4 BOARD
40 75D523S000 SW5 BOARD
41 G2147119 BOLT HOLDER
42 12569249S0 LITHIUM BATTERY CR2032
[Screws]
No. Part Code Part Name
a H5029854 HEX BUTTON BOLT M3x12 FeNi
b ******** M9 NUT (with ENCODER)
c H5039126 M9 WASHER (with ENCODER)
d H5039520 M9 NUT (VR)
e H5039510 NUT M9x11x2 FeNi (for Phone Jack)
f H5039112 WASHER M9 (for Phone Jack)
g 40342701 SCREW 2.3x8 BINDING TAPTITE P ZC
h 40011278 SCREW 3x8 BINDING TAPTITE P ZC
I 40011312 SCREW 3x8 BINDING TAPTITE P BZC
k 40127689 SCREW M3x10 BINDING TAPTITE S BZC
m H5019124 SCREW M3x6 BINDING W/PW+SW ZC
(Small Washer)
n H5019130 SCREW M3x6 BINDING W/PW+SW ZC
(Normal Washer)
o 40015901 E-RING M2.5 SUS
p 40342690 HEX BOLT M6x85 HALF THREAD BZC
q 40016067 PLAIN WASHER 6x13x1 BZC
r 40016001 NUT M6 U BZC
s 40019123 SCREW 3x8 BINDING TAPTITE S BZC
35
20 34
g
37
21
1
17
16
15
14
13
s
26 23
3
d
4
27 28
25
a
8
24
36 32
r
q
5
6
k31
p
qo
30
41 41
29
33
10
b
c
19
18
42
40
2
38
39
f
e
11
i
9
s
12 k
h
n
h
c
d
22
7
mm
h
h
s
76

8
Sep. 2001
WIRING DIAGRAM fig.wiring
MAIN BOARD ASSY
SW1 BOARD ASSY
ENC BOARD
ASSY
SW2 BOARD ASSY
SW3 BOARD
ASSY
EXP BOARD
ASSY
SW4 BOARD
ASSY
CN11
CN7 CN2
CN6
CN3
CN8
CN7
CN4
CN5
CN6
CN3
CN1
CN2
CN4
CN8
CN10
WIRING 8P WIRING 11P WIRING 7P
RIBON 3P
RIBON 7P
WIRING 10P
WIRING 3P
WIRING 2P

9
GT-6(T)
PARTS LIST
fig.part1e
fig.part2e
MB -> MAIN BOARD ASSY, SW -> SW SHEET ASSY
SAFETY PRECAUTIONS:
The parts marked have
safety-relatedcharacteristics.Use
only listed parts for replacement.
SAFETY PRECAUTIONS:
The parts marked have safety-related characteristics. Use only listed parts for replacement.
QTY PART NUMBER DESCRIPTION MODEL NUMBER
Ex. 10 22575241 Sharp Key C-20/50
15 2247017300 Knob (orange) DAC-15D
Failure to completely fill the above items with correct number and description will result in delayed or even
undelivered replacement.
NOTE: The parts marked # are new. (initial parts)
NOTE: Consider about the natural environment carefully before through the old lithium battery away when you exchange to the new one.
CASING Q'ty
#G2017150 BOTTOM COVER 1
# G2357120 FOOT H=5 5
G2227301 PEDAL ESCUTCHEON 7
G2357109 PEDAL FOOT 7
G2187602 SWITCH PEDAL 7
# G2017152 TOP COVER 1
# G2187533 VR PEDAL 1
KNOB, BUTTON
01340412 P R-KNOB SF-A BLK/LCG 1
12499175 G S-BUTTON S1H BLK 249-175 1
22485303 D R-KNOB L BLK 248-303 for ALPHA-DIAL 1
G2477122 R-KNOB 15
G247751001 kEYTOP S BLACK WITH LENS for SW 19
G247751301 KEYTOP S WITHOUT LENS for SW 4
SWITCH
#G2567120 RUBBER SW 1
01676512 SDKLA1-B PUSH SWITCH SW1 on MB 1
01780101 SKQKAB TACT SWITCH SW9,SW10,SW11,SW12,SW13,SW14,SW15,
SW16,SW17,SW18,SW19,SW20,SW21,SW22
,SW23,SW24,SW25,SW26,SW27,SW28,SW2
9,SW30,SW31 on SW
23
13129778 SKQKAH TACT SWITCH SW1,SW2,SW3,SW4,SW5,SW6,SW7 on SW 7
JACK, EXT TERMINAL
13449155MF HTJ-064-12I PHONE JACK (MONO) JK1,JK3,JK4,JK5,JK6 on MB 5
13449150MF HTJ-064-12D PHONE JACK (STEREO) JK2,JK11 on MB 2
01343723 YKC21-3117(ORANGE) RCA(PIN) JACK JK9 on MB 1
13429825 YKF51-5054 2PZ MIDI CONNECTOR JK8 on MB 1
13449728 HEC0740-010010 ADAPTOR JACK JK7 on MB 1
DISPLAY UNIT
#F5029405 LMC-SSC2K16DLNY-H01 LCD 1
# F5029412 A-552SR BW 7SEG LED LED29 on SW 1
PCB ASSY
#75D523M000 MAIN BOARD ASSY 1
# 75D523S000 SW SHEET ASSY 1
IC
#02676190 HD6412312VF IC (CPU) IC21 on MB 1
02231767 RA0A-101 (TC223C080AF-101) IC (DSP) IC20 on MB 1
02451434 AK4552VT IC (AD/DA) IC3,IC8 on MB 2
******** LH28F400BVE-BL85 IC (FLASH MEMORY/
BLANK) IC26 on MB 1
01785178 TC9271FS IC (DIF/TRANS MITTER) IC19 on MB 1
02453389 LC32V4265T-25 IC (DRAM) IC24 on MB 1
# 02672378 UPD431000AGW-A10 IC (SRAM) IC22 on MB 1
15289109 M5216FP-600D IC (BIPOLAR OP AMP) IC5 on MB 1
15189261 M5218AFP-600E IC (BIPOLAR OP AMP) IC6,IC4 on MB 2
00346445 NJM2100M(TE3) IC (BIPOLAR OP AMP) IC7,IC2 on MB 2
15259769T0 TC74HC238AF(EL) IC (CMOS) IC29 on MB 1
15169596 TC74HC4051AP IC (CMOS) IC4,IC5 on SW 2
01901623 TC74LVXC3245FS IC (CMOS) IC14 on MB 1

10
Sep. 2001
01670745 TC74VHCT541AF IC (CMOS) IC18 on MB 1
02232834 TC7SH04F(TE85L) IC (CMOS) IC27,IC17 on MB 2
15249121 TC7W04F(TE12L) IC (CMOS) IC16 on MB 1
02340756 TC7WH32FU(TE12L) IC (CMOS) IC28 on MB 1
00458034 TC75S51F TE85R IC (OP AMP) IC25 on MB 1
15289106 M5238AFP-600C IC (JFET OP AMP) IC1 on MB 1
02453056 BU2090F-E2 IC (LED DRIVER) IC1 on SW 1
# 02678945 BU2090 IC (LED DRIVER) IC2,IC3,IC6 on SW 3
15289124 PC-400 IC (PHOTO COUPLER) IC13 on MB 1
02012789 BA17805FP-E2 IC (REGULATOR) IC10 on MB 1
# 02786678 S-81233SGY IC (REGULATOR) IC31 on MB 1
02563467 NJM2374AM-TE1 IC (SWITCHING REGULA-
TOR) IC9 on MB 1
15289123 M51953AFP-600C IC (RESET) IC15 on MB 1
IC
TRANSISTOR
#F5309115 2SA1241-Y TRANSISTOR Q12 on MB 1
15309104 2SA1586-GR(TE85R) TRANSISTOR Q5,Q15 on MB 2
# F5309601 2SB1132 TRANSISTOR Q14 on MB 1
# F5309602 2SB1182 TRANSISTOR Q8 on MB 1
15319107 2SC4116-GR(TE85R) TRANSISTOR Q9 on MB 1
# F5319601 2SD1664 TRANSISTOR Q13 on MB 1
# F5319602 2SD1758 TRANSISTOR Q7 on MB 1
15329501 DTA143EKA T146 DIGITAL TRANSISTOR Q11 on MB 1
02340645 RN1441-A(TE85L) DIGITAL TRANSISTOR Q1,Q2,Q3,Q4,Q6 on MB 5
15129215 RN2207-TPE4 DIGITAL TRANSISTOR Q1,Q2,Q3,Q4 on SW 4
DIODE
15019126 1SS133 T-77 SWITCHING DIODE D1,D2,D3,D4,D5,D6,D7,D9,D10,D11,D12,D
13,D14,D15,D16,D17,D18,D19,D20,D21,D22
,D23,D24,D25,D26,D27,D28,D29,D30,D31on
SW
30
15339119T0 1SS352(TPH3) SWITCHING DIODE D1,D6,D8,D10,D11,D16,D17 on MB 7
F5019209RT 1N4004 DIODE D2,D4,D5,D12 on MB 4
02783023 RB500V-40 DIODE D9 on MB 1
F5339137 SS14 VF=0.45V DIODE D3 on MB 1
F5339310 RD10ESAB2 ZENER DIODE D13,D14 on MB 2
F5029117 L-312LRD LED (RED) LED9,LED10,LED11,LED12,LED13,LED14,
LED15,LED16,LED17,LED18,LED19,LED20
,LED21,LED22,LED23,LED24,LED25 on SW
17
1502928100 L-34HDSL LED (RED) LED1,LED2,LED3,LED4,LED5,LED6,LED7,
LED8 on SW 8
F5029111 L-3WSRSGW-CC LED (RED/GREEN) LED27,LED28 on SW 2
15339120T0 1SS302(TE85R) DIODE ARRAY DA3,DA4 on MB 2
RESISTOR
F3829254 47 OHM(2W) CARBON RESISTOR R11,R14 on MB 2
13749775T0 SR25TRE 121 J CARBON RESISTOR R23,R21 on SW 2
13749789T0 SR25TRE 471 J CARBON RESISTOR R31,R32,R33,R34,R35,R36,R37,R38,R39,R40,
R41,R42,R43,R44 on SW 14
00566867 RPC05T 100 J MTL.FILM RESISTOR R9,R54,R109 on MB 3
00567023 RPC05T 101 J MTL.FILM RESISTOR R69,R108 on MB 2
00567156 RPC05T 102 J MTL.FILM RESISTOR R21,R22,R32,R33,R55,R56,R100,R104,R107,
R113 on MB 10
00567289 RPC05T 103 J MTL.FILM RESISTOR R2,R6,R12,R13,R16,R19,R24,R27,R30,R35,R
37,R38,R41,R45,R47,R48,R52,R61,R72,R76,R
80,R82,R102,R105,R119,R120,R130,R132,R13
3,R134,R137 on MB
31
00567412 RPC05T 104 J MTL.FILM RESISTOR R23,R34,R58,R59,R116 on MB 5
00567556 RPC05T 105 J MTL.FILM RESISTOR R39,R7 on MB 2
00567034 RPC05T 121 J MTL.FILM RESISTOR R67 on MB 1
00567167 RPC05T 122 J MTL.FILM RESISTOR R40,R1 on MB 2
00567178 RPC05T 152 J MTL.FILM RESISTOR R65,R142 on MB 2
00567189 RPC05T 182 J MTL.FILM RESISTOR R66 on MB 1
00567312 RPC05T 183 J MTL.FILM RESISTOR R42,R3 on MB 2
00566912 RPC05T 220 J MTL.FILM RESISTOR R77 on MB 1
00567190 RPC05T 222 J MTL.FILM RESISTOR R112,R68 on MB 2
00567456 RPC05T 224 J MTL.FILM RESISTOR R46 on MB 1
00567089 RPC05T 331 J MTL.FILM RESISTOR R25,R36,R74 on MB 3
00567345 RPC05T 333 J MTL.FILM RESISTOR R51,R57 on MB 2
00567112 RPC05T 471 J MTL.FILM RESISTOR R70 on MB 1
00567245 RPC05T 472 J MTL.FILM RESISTOR R85,R91,R94,R103,R106,R110,R111,R114,R1
15 on MB 9
00567378 RPC05T 473 J MTL.FILM RESISTOR R17,R20,R28,R31,R49,R60,R122,R123,R124
on MB 9
00567501 RPC05T 474 J MTL.FILM RESISTOR R84 on MB 1
00567001 RPC05T 750 J MTL.FILM RESISTOR R71 on MB 1
00567401 RPC05T 823 J MTL.FILM RESISTOR R26,R15 on MB 2
15399349 RPC10T 100 J 1/10W MTL.FILM RESISTOR R139,R140,R141 on MB 3
01905012 RR0816P-123-D MTL.FILM RESISTOR R4,R8,R43,R50 on MB 4

11
GT-6(T)
01909734 RR0816P-682-D MTL.FILM RESISTOR R10,R53 on MB 2
02122623 RR0816R-104-D MTL.FILM RESISTOR R5,R44 on MB 2
# F5399911 0.68 (1/2W) RESISTOR R62 on MB 1
# F5399912 1.8K (F-RANK) RESISTOR R64 on MB 1
# F5399919 1M(F-RANK) RESISTOR R81 on MB 1
# F5399917 22 (1/2W) RESISTOR R75 on MB 1
# F5399913 3K (F-RANK) RESISTOR R63 on MB 1
# F5399920 4.7M(F-RANK) RESISTOR R121 on MB 1
# 13749787T0 SR25TRE 391J 1/6W RESISTOR R1,R2,R3,R4,R5,R6,R7,R8,R9,R10,R11,R12,R
13,R14,R15,R16,R17,R18,R19,R20,R22,R24,R
25,R26,R27,R28,R29 on SW
27
F5419707 CRN34101J RESISTOR ARRAY RA1,RA2,RA4,RA6,RA12,RA15 on MB 6
F5419705 CRN34103J RESISTOR ARRAY RA11,RA14,RA18,RA19,RA28 on MB 5
F5419706 CRN34104J RESISTOR ARRAY RA5,RA3 on MB 2
RESISTOR
POTENTIOMETER
F3279802 RD901-40-125F-B54-00D 50KB 9M/M ROTARY POT. W/
CLICK VR2,VR4,VR6,VR7,VR8,VR9,VR10,VR11,V R12,VR13,VR15,VR16 on SW 12
F3279804 RD901-40-125F-B54-06D 50KB 9M/M ROTARY POT. 6
CLICKS VR3,VR14 on SW 2
F3279803 RD901-40-125F-B54-11D 50KB 9M/M ROTARY POT. 11
CLICKS VR5 on SW 1
01676523 RK09K12A0 10KAx2 9M/M ROTARY POT. VR1 on MB 1
01016167 RK11K1140(10K SP B) 10Kx1 11M/M ROTARY POT. VR1 on SW 1
CAPACITOR
01674167 ECJ1VC1H100D CERAMIC CAPACITOR C3,C6,C16,C25,C38,C41,C42,C145,C146,C15
4 on MB 10
01674701 ECJ1VF1E104Z 0.1UF/16VK CERAMIC CAPACITOR C7,C9,C12,C14,C44,C48,C50,C53,C58,C59,C
77,C78,C79,C80,C83,C84,C86,C87,C88,C89,
C91,C92,C93,C95,C96,C98,C99,C100,C101,C
102,C103,C105,C106,C107,C108,C109,C110,
C111,C112,C114,C115,C118,C120,C123,C12
4,C125,C128,C131,C132,C134,C135,C136,C1
38,C139,C140,C141,C142,C147,C148,C149,C
159,C160,C162,C163 on MB
64
01674356 ECUV1H151JCV CERAMIC CAPACITOR C23,C33,C62 on MB 3
00567823 GRM39B102K50PT CERAMIC CAPACITOR C15,C24,C43,C54,C127 on MB 5
00567945 GRM39B103K50PT CERAMIC CAPACITOR C1,C36,C129,C130 on MB 4
01672412 GRM39CH150J50PT CERAMIC CAPACITOR C121,C119 on MB 2
13639550S0 16MV100HW+T 100UF/16V CHEMICAL CAPACITOR C21,C31,C66,C68,C69,C72,C157 on MB 7
13639546S0 16MV10HW+T CHEMICAL CAPACITOR C4,C8,C10,C11,C17,C18,C19,C20,C26,C27,C
28,C29,C30,C34,C39,C40,C46,C47,C49,C51,
C52,C94,C97,C104,C113,C116,C122,C126,C
133,C143,C150,C151,C152,C153 on MB
34
13639549S0 16MV47HW+T CHEMICAL CAPACITOR C13,C45,C76,C81 on MB 4
# 13639582S0 35MV100HW+T CHEMICAL CAPACITOR C64,C67,C70,C74 on MB 4
13639195S0 35MV2200HW(SME35VB2200) CHEMICAL CAPACITOR C56 on MB 1
# 13639598 35MV220HW+T CHEMICAL CAPACITOR C144 on MB 1
13639599S0 35MV470HW+T CHEMICAL CAPACITOR C65,C71 on MB 2
# 13609111 50MVR33HW+T CHEMICAL CAPACITOR C90 on MB 1
13639113S0 6MV470HW CHEMICAL CAPACITOR C61,C35 on MB 2
13519694 RPE132-901F104Z50 MLT.LAY.CERAMIC CAPACI-
TOR C1,C2,C3,C4,C5 on SW 5
13549279M0 ECQ-M1H104JF3 POLYEST. CAPACITOR C5 on MB 1
01128045 ERZVA7V330 VARISTOR CAPACITOR C55 on MB 1
INDUCTOR, COIL, FILTER
13529246 DSS310-91D223S-50ATL12-134 EMI FILTER FL1,FL2 on MB 2
12449386 SBT-0180W EMI FILTER L15 on MB 1
# F2449220 TSL1112SRA-471KR72 INDUCTOR L11 on MB 1
CRYSTAL, RESONATOR
#02672401 SG-8002JC 67.7376MHZ PC CRYSTAL X1 on MB 1
00894023 MA-406 20.000MHZ TE24 CRYSTAL X2 on MB 1
ENCODER
01905467 EVE GC1 F20 24B ROTARY ENCODER EN1 on SW 1
CONNECTOR
#F3439160 53015-0210 CONNECTOR CN8 on MB 1
F3439166 A2001WR2-11P CONNECTOR CN3 on MB 1
# F3439179 A2001WR2-7P CONNECTOR CN6 on MB 1
F3439164 A2001WR2-8P CONNECTOR CN7 on MB 1
F3439165 A2001WV2-10P P=2MM CONNECTOR CN2 on MB 1
# F3439178 A2541WV2-2A16NP CONNECTOR 1

12
Sep. 2001
F3439121 A2541WR2-2A16NP CONNECTOR 16P CN1 on MB 1
F3439123 A2001WR2-3P CONNECTOR 3P CN4 on MB 1
CONNECTOR
WIRING, CABLE
#G3467180 16P L=160MM LCD WIRING 1
G3477146 3P L=40X5X5 MM P=2MM RIBBON CABLE CN5,CN6 on SW 1
# G3477156 7P P=2MM L=140MM RIBBON CABLE CN1,CN3 on SW 1
# G3467179 10P P=2MM L=120MM WIRING CN2 on SW 1
# G3467177 11P P=2MM L=65MM WIRING CN7 on SW 1
# G3467174 2P P=2MM L=150MM WIRING CN10 on SW 1
# G3467175 3P P=2MM L=115MM WIRING CN4 on SW 1
# G3467176 7P P=2MM L=115MM WIRING CN8 on SW 1
# G3467178 8P P=2MM L=65MM WIRING CN11 on SW 1
TRANSFORMER
02563501 PT-10 (2280-T008) PULSE TRANS TR1 on MB 1
SCREWS
40342701 SCREW M2.3x8 BINDING TAP TIGHT P ZC 1
# H5019130 SCREW M3x6 PAN MACHINE W/SW+PW
ZC 5
H5019124 SCREW M3x6 PAN MACHINE W/
SW+SMALL PW ZC 10
40011312 SCREW 3x8 BINDING TAPTITE P BZC 3
40011278 SCREW 3x8 BINDING TAPTITE P FE ZC 20
40019123 SCREW 3x8 BINDING TAPTITE S BZC 18
40127689 SCREW M3x10 BINDING TAPTIGHT S TYPE
FE BZC 3
# H5029854 BOLT M3x12 HEX BUTTON FENI 6
40342690 HEX BOLT M6x85 HALF THREAD BZC 1
40016001 LOCK NUT M6 U BZC 1
# ******** M9 NUT (for ENCODER) 1
# H5039520 M9 NUT (for VR) 15
# H5039510 NUT M9x12x2 FENI (for Phone Jack) 7
40015901 E-RING M2.5 SUS 1
# H5039126 M9 WASHER (for ENCODER) 1
# H5039112 M9 WASHER (for Phone Jack) 7
40016067 PLAIN WASHER 6x13x1 BZC 2
PACKING
#G2607214 PACKING CASE 1
# G2237620 PAD L 1
# G2237616 PAD R 1
# G2617273 OUTER PACKING CASE 1
MISCELLANEOUS
G2147118 AC JACK HOLDER on MB 1
G2147119 BOLT HOLDER 2
# G2607215 COLOR SLEEVE 1
22360712 CORD HOOK 236-712 1
G2357111 CUSHION R 1
# G2567119 DISPLAY COVER 1
# G2567118 ESCUTCHEON (ABS,for PANEL) 1
# G2237112 GUARD 1
# G2237113 GUARD PLATE 1
40016523 INSULOK TIE 100M/M T-18R <<1000 PCS ORDERING
PER>> 2
G2257203 JACK COVER on MB 1
# H2369431 LED SPACER 3-2 for SW 1
12569249S0 LITHIUM BATTERY CR2032 220MAH/3V BT1 for MB 1
12189815 LITHIUM BATTERY HOLDER BH-32 BT1 on MB 1
# G2187904 PEDAL HOLDER 1
# G2217138 PEDAL LABEL(1) 1
# G2217139 PEDAL LABEL(2) 1
# G2217140 PEDAL LABEL(3) 1
# G2217143 PEDAL LABEL(4) 1
# G2217144 PEDAL LABEL(CTL) 1
# G2217142 PEDAL LABEL(DOWN) 1
# G2217141 PEDAL LABEL(UP) 1
G2147117 PIN STAY 1
# G2567121 RUBBER SW ESCUTCHEON 1
G2147116 SHAFT STAY 1
H2369401 SPACER 3X6X10 for SW 7
G2177103 SUPPORT SPRING 7
G2357112 VR PLATE 1

13
GT-6(T)
ACCESSORIES (STANDARD)
#G6017297 OWNER’S MANUAL JAPANESE 1
# G6017298 OWNER’S MANUAL ENGLISH 1
01786212 AC ADAPTOR BRC-100T 1
01786223 AC ADAPTOR BRC-120T 1
01786234 AC ADAPTOR BRC-230T 1
01786245 AC ADAPTOR BRC-240AT 1
00905234 EURO CONVERTER PLUG ECP01-5A (PLUG for 230V) 1
# H5279511 READ ME FIRST JAPANESE/ENGLISH 1
40232389 WARRANTY CARD (JAPAN ONLY) 1

14
Sep. 2001
IDENTIFYING THE VERSION
NUMBER
1. Turn the power off.
2. While pressing [NAME/NS/MASTER],[UTILITY] and [MANUAL]
button, turn on power.
3. The version number is displayed.
fig.LCD1
TRANSMITTING / RECEIVING
DATA VIA MIDI
The GT-6 can use exclusive messages to set another GT-6 to the same settings,
or to transmit its settings to a device such as a sequencer for storage.
The process of transmitting such data is called bulk dump, and the process of
receiving such data is called bulk load.
BULK DUMP
1. Press [UTILITY] button, then press PARAMETER [<] [>] button so that
“Bulk Dump” is displayed.
fig.Dump-1
2. Press PARAMETER [<] [>] button to move the cursor, and rotate the
[PATCH/VALUE] dial to select the start and end of the data to be
transmitted.
3. When the data to be sent has been determined, press [WRITE] button.
The data is transmitted.
fig.Dump-2
When the transmission is completed, the screen prior to transmission
returns to the display.
4. Press [EXIT] button to return to the Play screen.
BULK LOAD
1. Press [UTILITY] button, then press PARAMETER [<] [>] button so that
“Bulk Load” is displayed.
fig.Load-1
2. Transmit the data from the external MIDI device.
The following appears in the display when the GT-6 receives the data.
fig.Load-2
The following appears in the display when the GT-6 finishes receiving
the data.
fig.Load-3
At this stage, even more data can be received.
3. Press [EXIT] button to quit Bulk Load.
After you press [EXIT] button, “Checking...” appears in the display,
indicating that the GT-6 is checking the received data.
When the check is completed, the Play screen returns to the display.
TEST MODE
* Note: When user data is present, always back it up on the sequencer (MC-80,
etc.) before repair.
(Refer to “Saving data” and “Loading data” for the user data storage
procedures).
Individual inspection items
1.DSP Check
2.Display
3.LCD Contrast
4.Switch
5.VR Check
6.EXP PEDAL
7.Battery
8.MIDI IN/OUT
9.OUTPUT D/A
10.EXT OD/DS
11.INPUT A/D
12.DSP INTO
13.Noise (IN -> OUT)
14.Noise (EXT)
15.Calibrete EXP
16.Factory Load
Required items
• Expression Pedal (Roland EV-5)
• MIDI Cable
• Noise Meter
• Oscilloscope
• Oscillator
• Equipment with digital input
• Empty plug
How to enter test mode:
• Starting from “1.DSP Check”.
Turn on the unit while pressing the [DELAY] and [DELAY TAP] buttons
simultaneously.
The ROM version and the checksum will be displayed first.
Proceed to “1.DSP Check” by pressing the [EXIT] button.
fig.LCD1
• Starting from “9.OUTPUT D/A”.
Turn on the unit while pressing the [CHORUS] and [REVERB] buttons
simultaneously.
“1.DSP Check” result is displayed first, then it proceeds to “9.OUTPUT
D/A”.

15
GT-6(T)
1. DSP Check
fig.LCD2
DSP (IC20) and DRAM (IC24) are automatically checked and their results
displayed.
If an error occurs, its contents will be displayed, and if no problems exist,
“OK” is displayed.
After the inspection completes, it will automatically proceed to the next
inspection.
2. Display
fig.LCD3
All of the LCD and LED segments will be on.
Press the [EXIT] button to proceed to the next inspection.
3. LCD Contrast
fig.LCD4
Turn the [VALUE] encoder knob in the following order and confirm that the
LCD contrast changes.
1) Turning the knob anti-clockwise dims the contrast.
fig.LCD5
2) Turning the knob clockwise brightens the contrast.
fig.LCD4
Change the LCD contrast from ‘15 -> 0 -> 15’, and it will automatically proceed
to the next inspection.
4. Switch
fig.LCD6
The button names to be inspected are displayed on the lower part of the LCD.
Press the displayed button switches.
“Wrong switch!” is displayed when a wrong button is pressed.
Also, for buttons with LEDs confirm that:
1) All the LEDs that are on are red prior to pressing them.
2) The LEDs go out after the buttons are pressed.
However, for [PREAMP/SPEAKER TYPE VARIATION] and [OD/DS
TYPE VARIATION], the color changes from red to green.
Confirm the following two points.
Press the switches in the following order.
[1] Effect select button/Edit button group inspection Press according to the
LCD display.
[PREAMP/SPEAKER] -> [PREAMP/SPEAKER TYPE VARIATION]->[OD/
DS] -> [OD/DS TYPE VARIATION] -> [DELAY] -> [DELAY TAP] -
>[CHORUS] -> [REVERB] -> [FX-2] -> [FX-1] -> [EQ] -> [WAH] ->
[PARAMETER (<)] -> [EXIT] -> [PEDAL ASSIGN] -> [NAME/NS/MASTER] -
> [UTILITY] -> [OUTPUT SELECT] -> [WRITE] -> [PARAMETER (<)] -> [EZ
TONE] -> [TUNER/BYPASS] -> [MANUAL]
[2] The pedal switch group and expression switch inspection
[BANK DOWN] -> [BANK UP] -> [EXP PEDAL SW] -> [CTL PEDAL] ->
[PEDAL 4] -> [PEDAL 3] -> [PEDAL 2] -> [PEDAL 1]
[3] 7 seg LED
Confirm that the 7 seg LED segments go out one by one each time
[WAH] is pressed.
Pressing the [WAH] switch 14 times turns all the segments off .
After the [3] 7seg LED inspection completes, it will automatically proceed to
the next inspection.
5. VR Check
fig.LCD7
Turn all the VRs anti-clockwise all the way (set to MIN position).
The names of the VRs to be inspected are displayed on the lower part of the
LCD.
Turn the displayed VR.
[PATCH LEVEL]->[SPEAKER]->[PRE LEVEL]->[PRE TREBLE]->[PRE
MIDDLE]->[PRE BASS]->[PRE GAIN]->[PRE TYPE]->[OD/DS TYPE]->[OD/
DS DRIVE]->[OD/DS LEVEL]->[DELAY FEEDBACK]->[DELAY LEVEL]-
>[CHORUS]->[REVERB]
1) Without click - the 7 seg LED segments come on from the bottom according
to the positions of the VR knobs, except for the “SPEAKER”, “PREAMP/
SPEAKER TYPE” and “OVERDRIVE/DISTORTION TYPE” VRs.
To proceed to the next VR inspection, turn the knob all the way to the right (
[MIN] -> [MAX] ).
2) With click - the numbers are displayed for the 7 seg LED segments
according to the clicked position, except for the “SPEAKER”, “PREAMP/
SPEAKER TYPE” and “OVERDRIVE/DISTORTION TYPE” VRs.
“SPEAKER” : [1x10] -> [ORIGINAL]
“PREAMP/SPEAKER TYPE” : [JC CLEAN] -> [CUSTOM]
“OVERDRIVE/DISTORTION TYPE” : [OD/BOOST] -> [CUSTOM/
EXTERNAL]
To proceed to the next VR inspection, turn the knob all the way to the right (
[MIN] -> [MAX] ).
After the [REVERB LEVEL] VR inspection completes, it will automatically
proceed to the next inspection.
6. EXP PEDAL
fig.LCD8
Confirm the changes on the EXP pedal of this unit and the EXP pedal (SUB
EXP PEDAL) connected to the [SUB EXP PEDAL/SUB CTL 1,2] jack.
Connect the EV-5 to the [SUB EXP PEDAL/SUB CTL 1,2] jack.
The EXP pedal of this unit is inspected first, then the SUB EXP PEDAL.
1) Bringing the pedal’s tilt to the center (middle value) will display “***” in the
center display.
fig.LCD9
or

16
Sep. 2001
fig.LCD13
2) Pressing further (maximum value) displays “***” on the right display.
fig.LCD10
or
fig.LCD14
3) Finally, returning the pedal forward (minimum value) displays “***” on the
left display, and the inspection for that pedal is complete.
fig.LCD11
or
fig.LCD15
After the EXP PEDAL inspection completes, it will automatically proceed to
the next inspection.
7. Battery
fig.LCD16
The voltage of the memory backup battery is displayed.
To proceed to the next inspection, press the [EXIT] button.
8. MIDI IN/OUT
fig.LCD18
Connect the MIDI IN connector and the MIDI OUT connector with a MIDI
cable.
“No Connect” is displayed if the connectors are not connected with a MIDI
cable.
If the connectors are properly connected, “Verify OK !” is displayed.
After the MIDI IN/OUT inspection completes, it will automatically proceed to
the next inspection.
fig.LCD17
9. OUTPUT D/A
Note : Check both L(MONO) and R.
Also, when the OUTPUT jack is used for a single channel, the L and R
signals will be internally mixed, therefore, empty plugs must be inserted
in the R channel for L(MONO) channel measurement and in the
L(MONO) channel for R channel measurement, respectively.
fig.LCD19
Confirm these three points.
A) Using an oscilloscope, observe that a short wave is obtained from OUTPUT
.
B) Since output mute is automatically made ‘On/Off’, make sure that it is on.
C) Confirm that the level changes when the OUTPUT knob is turned.
fig.LCD20
Oscilloscope : 1.0 V/DIV, 0.5 ms/DIV
Mute = Off Mute = On
fig.1
fig.2
D) Confirm that a same waveform as that from OUTPUT is obtained from
Phones.
E) Confirm that a short wave is obtained from Send and that mute is effective.
Oscilloscope : 1.0 V/DIV, 0.5 ms/DIV
Mute = Off Mute = On

17
GT-6(T)
fig.3
fig.4
To proceed to the next inspection, press the buttons in [EXIT] ->
[PARAMETER (>)] sequence.
10. EXT OD/DS
fig.LCD21
Confirm the following two points.
A) Using an oscilloscope, observe that a short wave is obtained from OUTPUT.
fig.10ext-1e
B) Insert an open plug in the RETURN jack and confirm that there is no output.
fig.10ext-2e
Note: Check both L(MONO) and R.
Also, when the OUTPUT jack is used for a single channel, the L and R signals
will be internally mixed, therefore, empty plugs must be inserted in the R
channel for L(MONO) channel measurement and in the L(MONO) channel for
R channel measurement, respectively.
OUTPUT Level Control : MAX
Oscilloscope : 1.0 V/DIV, 0.5 ms/DIV
Insert an empty plug in RETURN
fig.4
fig.2
To proeed to the next inspection, press the [EXIT] button.
DSP D/A SEND
(Signal source)
DSP A/D RETURN
D/A OUTPUT
(Rectangular waveform)
DSP D/A SEND
(Signal source)
DSP A/D RETURN
D/A OUTPUT
(Rectangular waveform)
(Cut off)

18
Sep. 2001
11. INPUT A/D
fig.LCD22
Input a short wave, and observe the output waveform using an oscilloscope.
Note: Check both L(MONO) and R.
Also, when the OUTPUT jack is used for a single channel, the L and R signals
will be internally mixed, therefore, empty plugs must be inserted in the R
channel for L(MONO) channel measurement and in the L(MONO) channel for
R channel measurement, respectively.
INPUT : Rectangular Waveform, 400 Hz, 40 mVp-p
OUTPUT Level Control : MAX
Oscilloscope : 1.0 V/DIV, 0.5 ms/DIV
fig.5
To proceed to the next inspection, press the [EXIT] button.
12. DSP Pitch interruption signal
fig.LCD23
Confirm the pitch interruption signal generated from the DSP’s internal
oscillation.
If an error occurs, its contents will be displayed.
If no error occurs, it will automatically proceed to the next inspection.
13. Noise (IN -> OUT)
fig.LCD24
Note: Check both L(MONO) and R.
Also, when the OUTPUT jack is used for a single channel, the L and R signals
will be internally mixed, therefore, empty plugs must be inserted in the R
channel for L(MONO) channel measurement and in the L(MONO) channel for
R channel measurement, respectively.
OUTPUT Level Control: MAX
Confirm that the residual noise is -74 dBm (JIS-A) or lower.
fig.13noise-e
To proceed to the next inspection, press the [EXIT] button.
14. Noise (EXT)
fig.LCD25
Note: Check both L(MONO) and R.
Also, when the OUTPUT jack is used for a single channel, the L and R signals
will be internally mixed, therefore an empty plug must be inserted in the R
channel for L(MONO) channel measurement, and an empty plug must be
inserted in the L(MONO) channel for R channel measurement.
OUTPUT Level Control: MAX
Confirm that the residual noise is -64 dBm (JIS-A) or lower.
fig.14noise-e
To proceed to the next inspection, press the [EXIT] button.
DSP A/D INPUT
D/A OUTPUT
(Connect noise meter)

DSP A/D INPUT
D/A SEND
DSP A/D RETURN
D/A OUTPUT
(Connect noise meter)

19
GT-6(T)
15. Calibrate EXP
fig.LCD26
1) The maximum and minimum values of the EXP pedal are set up.
fig.LCD27
fig.arrow
fig.LCD26
2) To set up the minimum value, press the [WRITE] button.
fig.LCD28
fig.arrow
fig.LCD26
3) Fully press the EXP pedal and release your hands.
4) To set up the maximum value, press the [WRITE] button.
When the calibration setup is completed, will automatically proceed to the
next inspection.
16. Factory load
fig.LCD29
To overwrite the factory preset data, press the [WRITE] button three times.
fig.LCD30
This ends test mode.
When the following displayed appears, turn off the power.
17. DIGITAL OUT
After the test mode is completed, connect external equipment that has a
DIGITAL IN terminal to DIGITAL OUT, and confirm that the sound is
properly output from DIGITAL OUT of the GT-6.
RESTORING THE FACTORY
SETTINGS (FACTORY RESET)
1. Turn off the power.
2. While holding down PREAMP/SPEAKER On/Off button and [TYPE
VARIATION], turn on the power.
The Factory Reset range setting screen appears in the display.
fig.FR-1e
* To cancel Factory Reset, press [EXIT] button.
3. Press PARAMETER [<] [>] button to move the cursor, and rotate the
PATCH/VALUE dial to specify the range of settings you want to restore
to factory settings.
System:
System parameters, Harmonist scales, Auto Riff phrases, and Preamp,
Overdrive/Distortion, and Wah Custom Edit parameter settings
#1-1-#35-4:
Settings for Patch Number 1-1 through 35-4
4. If you want to proceed with the factory reset, press [ENTER] button.
The specified range of data will be returned, and return to the Play
screen.
HOW TO UPDATE SYSTEM
SOFTWARE
Required items
• Sequencer (MC-80, etc.)
• MIDI cable
• Update Disk (#17041087)
* Notes
Do not turn the GT-6 unit’s power off while writing the system software.
The GT-6 will not operate because the system will not be properly
written into the flash ROM.
* Notes
After updating, execute “TEST:15.Calibrate EXP” and “TEST:16.Factory
Load” while in the test mode.
The System Update Via SMF
The GT-6 system is supplied in standard MIDI file (SMF) format.
The following SMF data is stored on the disk. Starting with GT6_01.mid,
transfer all data to the GT-6 in the respective order.
GT-6 System Ver.*.** SMF Disk : GT6_01.mid, GT6_02.mid, GT6_03.mid,
GT6_04.mid, GT6_05.mid, GT6_06.mid, GT6_07.mid, GT6_08.mid
Update the GT-6’s system in the following
order.
1. Using a MIDI cable, connect the MIDI OUT connector of the sequencer to
the MIDI IN connector of the GT-6.
2. Turn the GT-6’s power on while pressing the [FX-2] and [PEDAL
ASSIGN] and [UTILITY] buttons simultaneously.
The unit is in reception standby status if the LCD displays “Flash Update
ALL BLOCK” then displays “Waiting SMF Data [GT6_01.mid]”.
The area of data you wish to factory reset.

20
Sep. 2001
3. The GT6_01.mid SMF data will be sent from the sequencer to the GT-6.
When the GT-6 receives the MIDI signal, the write address and the
checksum will be displayed on the LCD.
When all the GT6_01.mid SMF data has been received, the GT-6 writes
the received data to the flash ROM.
When it finishes writing, the GT-6 displays “Waiting SMF Data
[GT6_02.mid]” on the LCD display.
Next, the GT6_02.mid SMF data is sent from the sequencer.
When the sequencer receives the MIDI signal, the write address and the
checksum will be displayed on the LCD.
Play the SMF data in the manner stated above one by one in the
respective sequence up to GT6_08.mid.
3-1.GT-6 : “Waiting SMF Data [GT6_01.mid]” -> MC-80 : GT6_01.mid play
3-2.GT-6 : “Waiting SMF Data [GT6_02.mid]” -> MC-80 : GT6_02.mid play
3-3.GT-6 : “Waiting SMF Data [GT6_03.mid]” -> MC-80 : GT6_03.mid play
3-4.GT-6 : “Waiting SMF Data [GT6_04.mid]” -> MC-80 : GT6_04.mid play
3-5.GT-6 : “Waiting SMF Data [GT6_05.mid]” -> MC-80 : GT6_05.mid play
3-6.GT-6 : “Waiting SMF Data [GT6_06.mid]” -> MC-80 : GT6_06.mid play
3-7.GT-6 : “Waiting SMF Data [GT6_07.mid]” -> MC-80 : GT6_07.mid play
3-8.GT-6 : “Waiting SMF Data [GT6_08.mid]” -> MC-80 : GT6_08.mid play
4. After the GT-6 receives all the SMF data, it will display the checksum (4-
digit number) of the system software on the LCD display, so confirm it.
5. Execute “TEST:15.Calibrate EXP” and “TEST:16.Factory Load” while in
the test mode.
Updating is now completed.

21
GT-6(T)
BLOCK DIAGRAM
fig.block
CN7
IC3
CODEC
AK4552
IC20 DSP
IC24
DRAM 4M
IC22
SRAM 1M
IC26
Flash 4M
LCD UNIT
SW 2 BOARD ASSY
PEDAL SW,LED
IC8
CODEC
AK4552
OUTPUT L
OUTPUT R
RETURN
SEND
PHONES
MIDI OUT IN
OUTPUT
VOLUME
IC21 CPU
H8S/2318
SUB EXP PEDAL
SUB CTL 1,2
INPUT
JK5
JK6 IC6b
IC6a IC7a
IC7b
IC4bIC5b
IC5a IC4aVR1a
VR1b
IC2a
IC2bIC1b
JK4
JK3
JK2
JK1
JK11
EXT OD/DS
EXT OD/DS
JK8
CN2
CN1
CN2
SW 1 BOARD ASSY
PANEL SW,LED
CN11
EXP BOARD ASSY
PEDAL VR
CN4CN4
MAIN BOARD ASSY
DIGITAL OUT
SW4 BOARD ASSY
CARBON SW
CN10
CN8 ENC BOARD
ENCODER
SW 3 BOARD ASSY
PEDAL SW,LED
TR1
R71 IC17 IC19
TC9271FS
CN5
CN6
CN11
CN3
CN6 CN8
CN3 CN7

Sep. 2001 GT-6(T)
CIRCUIT BOARD (MAIN)
fig.wiring
View from components side
2322