Roland GT-6 Schematic
Sep. 2 0 0 1 GT-6 (T)
SERVICE N OTES
First Edition
Guitar Effects Processor
TABLE OF CO N TEN TS
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
Issued by RJA
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
Copyright © 20 0 2 ROLAN D CORPORATIO N
All rights reserved. No part of this publication may be reproduced in any form without the written permission
of ROLAND CORPORATION.
Printed in Japa n (0 8 0 0) (CM)
Sep. 2 0 0 1
SPECIFICATIO N S
GT-6 : Guita r 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.
2
GT-6 (T)
3
54
Sep. 2 0 0 1 GT-6 (T)
LOCATIO N OF CON TROLS PARTS LIST
No. Part Code Part Name Q’ty
1 G2477122 R-KNOB 15
2 F3279803 POTENTIOMETER RD901-40-125F-
B54-11D (11 click)
3 F3279804 POTENTIOMETER RD901-40-125F-
B54-06D (6 click)
4 F3279802 POTENTIOMETER RD901-40-125F-
B54-00D
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
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-CC2
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)
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
46 01340412 P R-KNOB SF-A BLK/LCG 1
47 01676523 9M/M ROTARY POT. RK09K12A0
10KAX2
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
LOCATIO N OF CON TROLS
fig.panel
14.19.
23.
15.17.19.
25. 26.
24.
50.51.
18.
53.
28.29.
27.
39.40.41.42
38.
30.31.32.33.
34.35.37.
1.2.
5.
15.16.19.
10.
1.3.
11.12.13.
1
2
12
1
1
1.3.
6.
18.
2
1
7.
20.
8.
21.
9.
46.47.
1.4.
22.
45.
36.43.
44.
48.
49.
52.
Sep. 2 0 0 1 GT-6 (T)
EXPLODED VIEW PARTS LIST
[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
EXPLODED VIEW
fig.jack
25
28
27
24
20
35
34
g
h
a
8
4
3
26
s
13
37
23
d
14
15
16
17
21
7
10
b
c
33
k
19
18
1
6
5
41
q
r
32
36
29
41
31
p
q
o
30
[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
42
h
h
h
n
12
k
s
9
i
11
f
e
38
m
39
s
d
22
c
40
m
2
76
Sep. 2 0 0 1
W IRIN G DIAGRAM
SW2 BOARD ASSY
WIRING 10P
CN2
CN1
WIRING 8P
CN11
SW1
CN7
WIRING 11P
CN7
BOARD
CN3
WIRING 7P
CN8
ASSY
CN6
RIBON 3P
CN5
ENC BOARD
ASSY
CN6
MAIN BOARD ASSY
CN2
RIBON 7P
CN3
SW3 BOARD
ASSY
CN8
CN4
EXP BOARD
ASSY
CN4
SW4 BOARD
ASSY
CN10
WIRING 2P
WIRING 3P
8
PARTS LIST
fig.part1e
IC
GT-6 (T)
SAFETY PRECAUTIONS:
The parts marked have
safety-related characteristics. Use
only listed parts for replacement.
NOTE: The parts marked # are new. (initial parts)
fig.part2e
NOTE: Consider about the natural environment carefully before through the old lithium battery away when you exchange to the new one.
MB -> MAIN BOARD ASSY, SW -> SW SHEET ASSY
CASING Q'ty
# G2017150 BOTTOM COVER 1
# G2357120 FOOT H=5 5
# G2017152 TOP COVER 1
# G2187533 VR PEDAL 1
KNOB, BUTTON
G2227301 PEDAL ESCUTCHEON 7
G2357109 PEDAL FOOT 7
G2187602 SWITCH PEDAL 7
01340412
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
SAFETY PRECAUTIONS:
The parts marked have safety-related characteristics. Use only listed parts for replacement.
Failure to completely fill the above items with correct number and description will result in delayed or even
undelivered replacement.
P R-KNOB SF-A BLK/LCG 1
QTY PART NUMBER DESCRIPTION MODEL NUMBER
Ex. 10 22575241 Sharp Key C-20/50
15 2247017300 Knob (orange) DAC-15D
SWITCH
# G2567120 RUBBER SW 1
JACK, EXT TERMINAL
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
# 02676190 HD6412312VF IC (CPU) IC21 on MB 1
# 02672378 UPD431000AGW-A10 IC (SRAM) IC22 on MB 1
01676512 SDKLA1-B PUSH SWITCH SW1 on MB 1
01780101 SKQKAB TACT SWITCH SW9,SW10,SW11,SW12,SW13,SW14,SW15,
13129778 SKQKAH TACT SWITCH SW1,SW2,SW3,SW4,SW5,SW6,SW7 on SW 7
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
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)
01785178 TC9271FS IC (DIF/TRANS MITTER) IC19 on MB 1
02453389 LC32V4265T-25 IC (DRAM) IC24 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
SW16,SW17,SW18,SW19,SW20,SW21,SW22
,SW23,SW24,SW25,SW26,SW27,SW28,SW2
9,SW30,SW31 on SW
IC26 on MB 1
23
9
Sep. 2 0 0 1
IC
# 02678945 BU2090 IC (LED DRIVER) IC2,IC3,IC6 on SW 3
# 02786678 S-81233SGY IC (REGULATOR) IC31 on MB 1
TRANSISTOR
# F5309115 2SA1241-Y TRANSISTOR Q12 on MB 1
# F5309601 2SB1132 TRANSISTOR Q14 on MB 1
# F5309602 2SB1182 TRANSISTOR Q8 on MB 1
# F5319601 2SD1664 TRANSISTOR Q13 on MB 1
# F5319602 2SD1758 TRANSISTOR Q7 on MB 1
DIODE
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
15289124 PC-400 IC (PHOTO COUPLER) IC13 on MB 1
02012789 BA17805FP-E2 IC (REGULATOR) IC10 on MB 1
02563467 NJM2374AM-TE1 IC (SWITCHING REGULA-
TOR)
15289123 M51953AFP-600C IC (RESET) IC15 on MB 1
15309104 2SA1586-GR(TE85R) TRANSISTOR Q5,Q15 on MB 2
15319107 2SC4116-GR(TE85R) TRANSISTOR Q9 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
15019126 1SS133 T-77 SWITCHING DIODE D1,D2,D3,D4,D5,D6,D7,D9,D10,D11,D12,D
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,
1502928100 L-34HDSL LED (RED) LED1,LED2,LED3,LED4,LED5,LED6,LED7,
F5029111 L-3WSRSGW-CC LED (RED/GREEN) LED27,LED28 on SW 2
15339120T0 1SS302(TE85R) DIODE ARRAY DA3,DA4 on MB 2
IC9 on MB 1
13,D14,D15,D16,D17,D18,D19,D20,D21,D22
,D23,D24,D25,D26,D27,D28,D29,D30,D31on
SW
LED15,LED16,LED17,LED18,LED19,LED20
,LED21,LED22,LED23,LED24,LED25 on SW
LED8 on SW
30
17
8
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
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
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
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
00567378 RPC05T 473 J MTL.FILM RESISTOR R17,R20,R28,R31,R49,R60,R122,R123,R124
on MB
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
14
10
31
9
9
1 0
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