Roland JC-40 Operating and maintenance manual

SERVICE NOTES
Issued by RJA
Copyright © 2015 Roland Corporation
All rights reserved. No part of this publication may be reproduced in any form without the written permission
of Roland Corporation.
CC-KWS17057004E0
JC-40Nov. 2015
Table of Contents
Cautionary Notes ..............................................................2
Specifications .....................................................................3
Location of Controls .........................................................4
Exploded View (Cabinet).................................................5
Plain View (Cabinet).........................................................6
Plain View (Cabinet) Parts List .......................................7
Exploded View (Chassis) .................................................8
Exploded View (Chassis) Parts List................................9
Plain View (Chassis) .......................................................10
Important Notes When Binding Wiring ......................11
Wiring Diagram/Block Diagram..................................12
Parts List...........................................................................14
Verifying the Version......................................................16
Test Mode .........................................................................16
Circuit Board (Main, Jack, Volume, PS, Inlet Board) .18
Circuit Diagram (Main Board: 1/4)..............................20
Circuit Diagram (Main Board: 2/4)..............................22
Circuit Diagram (Main Board: 3/4)..............................24
Circuit Diagram (Main Board: 4/4)..............................26
Circuit Diagram (Jack Board) ........................................28
Circuit Diagram (Volume Board) .................................30
Circuit Diagram (PS Board) ...........................................31
Circuit Diagram (Inlet Board) .......................................31

2
Nov. 2015 JC-40
Cautionary Notes
Before beginning the procedure, please read
through this document. The matters described may
differ according to the model.
No User Data
This product cannot save user data. Backing up user data during servicing is
not required.
Part Replacement
When replacing components near the power-supply circuit or a heat-
generating circuit (such as a circuit provided with a heat sink or including a
cement resistor), carry out the procedure according to the instructions with
respect to the part number, direction, and attachment position (mounting so as
to leave an air gap between the component and the circuit board, etc.).
Parts List
A component whose part code is ******** will not be supplied as a service part
because one of the following reasons applies.
• Because it is supplied as an assembled part (under a different part code).
• Because a number of circuit boards are grouped together and supplied as
a single circuit board (under a different part code).
• Because supply is prohibited due to copyright restrictions.
• Because reissuance is restricted.
• Because the part is made to order (at current market price).
• Because it is carried in electronic data on the Roland web site.
• Because it is a package or an accessory irrelevant to the function
maintenance of the main body.
• Because it can be replaced with an article on the market. (battery or etc.)
Circuit Diagram
In the circuit diagram, “NIU” is an abbreviation for “Not in Use,” and
“UnPop” is an abbreviation for “Unpopulated.” They both mean non-mounted
components. The circuit board and circuit board diagram show silk-screened
indications, but no components are mounted.

3
JC-40Nov. 2015
Specifications
Roland JC-40: Guitar Amplifier
Rated Power Output
40 W
Nominal Input Level
INPUT L/MONO, R jacks: -10 dBu (1 M ohm)
EFFECT RETURN L/MONO, R jacks: -10 dBu (22 k ohms)
EFFECT RETURN L/MONO only: -10 dBu (11 k ohms)
Speakers
25 cm (10 inches) x 2
Controls
POWER switch
BRI (Bright) Switch
VOLUME knob
TREBLE knob
MIDDLE knob
BASS knob
DISTORTION knob
REVERB knob
SPEED knob
DEPTH knob
VIB/CHORUS switch
EFFECT LOOP switch
Indicator
POWER
Connectors
INPUT L/MONO, R jacks: 1/4-inch phone type
LINE OUT L/MONO, R jacks: 1/4-inch phone type
PHONES jack: Stereo 1/4-inch TRS phone type
FOOT SWITCH (CHORUS VIBRATO, REVERB, DISTORTION) jacks: 1/4-inch
phone type
EFFECT LOOP SEND jack: 1/4-inch phone type
EFFECT LOOP RETURN L/MONO, R jacks: 1/4-inch phone type
AC IN jack
Power Consumption
43 W
Dimensions
592 (W) x 251 (D) x 436 (H) mm
23-5/16 (W) x 9-15/16 (D) x 17-3/16 (H) inches
Weight
15.8 kg
34 lbs 14 oz
Accessories
Owner's manual (#5100046052)
Power cord (#5100029165, #5100012292, #00894378, #03450323, #5100013648,
#00907001, #00894389, #5100013842)
Options (sold separately)
Footswitch (BOSS FS-5L, FS-6, FS-7)
* 0 dBu = 0.775 Vrms
* Printed matters will not be supplied after the end of the production. Then,
download the electronic file from the Roland web site.
* In the interest of product improvement, the specifications and/or appearance of
this unit are subject to change without prior notice.

4
Nov. 2015 JC-40
Location of Controls
fig.panel.eps
6 59 4 127
10 10
9
11
12
3 3 38
88
8
No. Part Code Part Name Description Q’ty
1 02897801 SEESAW SWITCH SDDJE13200 94V-0 1
5100046595 POWER SW ESCUTCHEON 1
5100046598 POWER SW CUSHION 2
2 5100048310 LED L-7113-CW914(S) 1
5100046599 LED SPACER LEH5-6T 1
5100046591 LED ESCUTCHEON 1
3 22485314 JC-KNOB 248-314(22485314R0) 9
4 5100042592 SWITCH S171EV114GFS2AN17 1
* This unit includes the following parts.
******** NUT attached to Switch 1
******** WASHER attached to Switch 1
******** SPACER attached to Switch 1
5 5100033433 ROTARY POTENTIOMETER R0923NOCV1B103FE00A1 2
* This unit includes the following parts.
******** VR NUT attached to VR 2
******** VR WASHER attached to VR 2
6 5100037963 ROTARY POTENTIOMETER R0923NOCH1B103FE00A1 6
* This unit includes the following parts.
******** VR NUT attached to VR 6
******** VR WASHER attached to VR 6
7 00125612 KEYTOP (BLK/GRY) 1
01348745 SWITCH(PUSH) SPUP192700(400-11034-01-00) 1
8 5100046593 JACK SPACER 11
9 5100024419 6.5MM JACK PJ-644C-04-EP(610-11020-01-00 9
* This unit includes the following parts.
******** JACK NUT attached to Jack 9
******** JACK WASHER attached to Jack 9
10 5100031944 6.5MM JACK PJ-644C-EP 2
* This unit includes the following parts.
******** JACK NUT attached to Jack 2
******** JACK WASHER attached to Jack 2
11 04459978 SLIDE SWITCH SV70050F-0202-10T-NN 1
12 5100033643 AC INLET(610-11017-08-00) M1908-B W/ CCC MARK 1

5
JC-40Nov. 2015
Exploded View (Cabinet)
fig.bunkaizu-cabinet.eps
4
1
3
2
6
5
5
7
8
9
Refer to Chassis
View 6
View 7
View 2
View 1
View 5
View 3
View 4
No. Part Code Part Name Description Q’ty
5100042788 CABINET ASSY W/O SPEAKER 1
* This unit includes the following parts.
1******** CABINET
2******** NET BOARD ASSY 1
3 22510402 BADGE G.AMP 61 1
4 22310207 HANDLE (H40) 231-207 W/ESCUCHEON (2 HOLES) 1
5 22340202 PROTECTION CORNER 8
6 5100046034 RUBBER FOOT D25*T12 BLK 4
9******** BACK BOARD 1
7 5100046048 SPEAKER W1004-057A 2
8 5100046047 LABEL SPEAKER MAGNET 2

6
Nov. 2015 JC-40
Plain View (Cabinet)
fig.bunkaizu-cabinet-H.eps
a
d
e
c c
b
c
c
f f
g
g
View 1 View 2
View 3 View 4 View 5
View 6 View 7

7
JC-40Nov. 2015
Plain View (Cabinet) Parts List
View 1
View 2
View 3, 4
View 5
View 6
View 7
No. Part Code Part Name Description Q’ty
a 40010489 SCREW M5X30 OVAL FE BZC 4
c 40010601 SCREW M5X35 ORIGINAL TRUSS MACHINE FE BZC 6
No. Part Code Part Name Description Q’ty
b 5100046058 SCREW 3X14 OVAL TAPPING A ED-BLK 2
No. Part Code Part Name Description Q’ty
c 40010601 SCREW M5X35 ORIGINAL TRUSS MACHINE FE BZC 2
No. Part Code Part Name Description Q’ty
d 40010689 SCREW 4X25 TRUSS TAPPING A FE BZC 4
No. Part Code Part Name Description Q’ty
e 40010678 SCREW 4X20 TRUSS TAPPING A FE BZC 6
No. Part Code Part Name Description Q’ty
f 40560756 FLANGE NUT M4 BZC 8
g 40560756 FLANGE NUT M4 BZC 7
5100044181 PLAIN WASHER 4.2X10X1 BZC 7
5100046055 SPRING WASHER 4.4X6.5X1 BZC 7

8
Nov. 2015 JC-40
Exploded View (Chassis)
fig.bunkaizu-chassis.eps
2
6
19
18
16
20
17
9
22
14 15
4
5
3
1
7
10 11
12 13
14
21
8
8
g
h
e
i
f
j
k
h
g
c
c
d
d
a
b
8
23
View 9
View 8

9
JC-40Nov. 2015
Exploded View (Chassis) Parts List
No. Part Code Part Name Description Q’ty
1 00125612 KEYTOP (BLK/GRY) 1
2 22485314 JC-KNOB 248-314(22485314R0) 9
3 5100046591 LED ESCUTCHEON 1
4 5100046595 POWER SW ESCUTCHEON 1
5 5100046598 POWER SW CUSHION 2
6 02897801 SEESAW SWITCH SDDJE13200 94V-0 1
7 5100046042 CHASSIS 1
8 5100039123 POWER AMP TDA2050L-TB5-T 2
9 5100046590 HEATSINK 2
5100042776 MAIN SHEET ASSY 1
* This unit includes the following parts.
10 ******** MAIN BOARD 1
11 ******** JACK BOARD 1
12 ******** VOLUME BOARD 1
13 ******** PS BOARD 1
18 ******** INLET BOARD 1
14 5100046593 JACK SPACER 11
15 22150580 STANDOFF M3-L5.5-H7 6
16 5100016080 POWER TRANS(461-11035-01-00) PT-AP018 100/117V for low voltage 1
5100016081 POWER TRANSFORMER PT-AP018 230/240V for high voltage 1
17 5100046592 TRANS PLATE 2
19 5100033643 AC INLET(610-11017-08-00) M1908-B W/ CCC MARK 1
20 5100046602 ACETATE TAPE #156A 35X25XT0.25 2
21 5100048346 ACETATE TAPE NITTO #156A BLACK W20MM 30M -
22 40342901 SILICONE GREASE G-746 200G -
23 40122445 ADHESIVE CEMEDINE SUPER-X NO.8008 170G/135ML -
a 40011767 FLANGE HEX NUT M4 FE ZC 2
b 40230023 SPRING WASHER M4 ZC 2
c 40017934 SCREW M3X6 PAN MACHINE W/SW+PW(L) FE ZC 6
d 40013078 SCREW M3X10 PAN MACHINE W/SW FE ZC 2
e******** VR NUT attached to VR 8
f******** VR WASHER attached to VR 8
g******** JACK NUT attached to Jack 11
h******** JACK WASHER attached to Jack 11
i******** NUT attached to Switch 1
j******** WASHER attached to Switch 1
k******** SPACER attached to Switch 1

10
Nov. 2015 JC-40
Plain View (Chassis)
fig.bunkaizu-chassis-H.eps
View 8
View 9
c
e
c
cc
a ab
dd
25
View 8
View 9
No. Part Code Part Name Description Q’ty
a 40012945 SCREW M3X6 PAN MACHINE W/SW+PW BZC 2
b 40011112 SCREW 3X10 BINDING TAPTITE B BZC 2
No. Part Code Part Name Description Q’ty
25 40013812 CAUTION SEAL IEC #142 1
c 40017934 SCREW M3X6 PAN MACHINE W/SW+PW(L) FE ZC 15
d 22150580 STANDOFF M3-L5.5-H7 6
e 40011889 EXTERNAL TOOTH WASHER M4 FECM 1
40011767 FLANGE HEX NUT M4 FE ZC 1

11
JC-40Nov. 2015
Important Notes When
Binding Wiring
Keep away the wirings shown in the figure below from resistor and diode.
fig.wiring-clamp-1.eps
Pass the primary wiring under the transformer so that the wiring does not
touch the tip of the screw securing from the side.
fig.wiring-clamp-2-e.eps
Keep away the LED wiring from the fuse.
fig.wiring-clamp-3.eps
Pass the wiring
under the transformer.
Keep away the wirings
from the tip of the screw.

12
Nov. 2015 JC-40
Wiring Diagram/Block Diagram
fig.wiring-block.eps@L
DAC
INPUT
ADC
MIDDLE BASS DISTORTION
VOLUME REVERB
R
DAC
DAC
BRI
ADC
L/MONO
VOLUME BOARD
MAIN BOARD
JACK BOARD
(DIGITAL PART)
TREBLE
VIB/CHORUS
SPEED DEPTH
DISTORTION REVERB CHORUS
VIBRATO
LOOP
W11
W2
W3
IC4
IC6
Q26
Q13
JK2
JK1
IC18
IC13
IC30
IC9
IC31
IC26
IC22
IC16
CPU/DSP
SW1 VR2 VR3 VR4 VR5 VR6 VR7
SW800
JK800 JK802 JK801
VR500 VR501 SW500
ADC
IC29
No. Part Code Part Name Description Q’ty
W1 5100046167 WIRING 1007#28 15X260-PHR-SAN-F 1
W2 5100046168 WIRING 1007#28 7X200-PHR-SAN-F 1
W3 5100046170 WIRING 1007#28 2X230-PHR-SAN-F 1
W4 5100046171 WIRING W4 (1672#22-BLK) 2
W5 5100046177 WIRING W5 (1015#22-RED) 1
W6 5100046178 WIRING W6 (1015#22-BLK) 1
W7 5100046179 WIRING W7 (1015#22-ORG) 1
W8 5100046188 WIRING W8 (1015#22-BRN) 1
W10 5100047043 WIRING W10 (1672#18-BLK/WHT) 1
W11 5100047044 WIRING 1007#28 8X90-PHR-SAN-F 1
W14 5100033985 WIRING W14 1

13
JC-40Nov. 2015
fig.wiring-block.eps@R
4 ohms
RETURN
Built-in Speaker
LINE OUT
PHONES
L/MONO
R
L/MONO
R
SEND
EQ
JACK BOARD
(ANALOG PART)
POWER
TRANSFORMER
INLET BOARD
POWER LED POWER SWITCH
PS BOARD
Primary side
Secondary side
Power Amplifier
IC23
Power Amplifier
IC10
IC24
IC8
IC21
Left
Right
JK806
JK803
JK805
JK804
JK808
JK807
IC802
LED600
JK700
EQ
W4
W10
W14
W1
W5
W6
W7
W8
RED
BLACK
BROWN
ORANGE

14
Nov. 2015 JC-40
Parts List
fig.-part1-e.eps
Note: The parts marked # are new. (initial parts) The description “Q’ty” means a necessary number of the parts per one product.
Due to one or more of the following reasons, parts with parts code ******** cannot be supplied
as service parts.
• Supply is prohibited due to copyright restrictions.
• It is carried in electronic data on the Roland website.
• The part is made to order (at current market price).
• It can be replaced with an article on the market. (battery or etc.)
• It is a package or an accessory irrelevant to the function maintenance of the main body.
• A number of circuit boards are grouped together and supplied as a single circuit board (under a different part code).
• Reissuance is restricted.
• It is supplied as an assembled part
(under a different part code).
Safety Precautions:
The parts marked have
safety-related characteristics. Use
only listed parts for replacement.
CASING
# 5100042788 CABINET ASSY W/O SPEAKER 1
CHASSIS
# 5100046042 CHASSIS 1
# 5100046590 HEATSINK 2
# 5100046592 TRANS PLATE 2
KNOB, BUTTON
22485314 JC-KNOB 248-314(22485314R0) 9
00125612 KEYTOP (BLK/GRY) 1
SWITCH
02897801 SEESAW SWITCH SDDJE13200 94V-0 1
04459978 SLIDE SWITCH SV70050F-0202-10T-NN 1
5100042592 SWITCH S171EV114GFS2AN17 1
01348745 SWITCH(PUSH) SPUP192700(400-11034-01-00) 1
JACK, EXT TERMINAL
5100031944 6.5MM JACK PJ-644C-EP 2
5100024419 6.5MM JACK PJ-644C-04-EP(610-11020-01-00 9
SPEAKER, BUZZER
# 5100046048 SPEAKER W1004-057A 2
PWB ASSY
# 5100042776 MAIN SHEET ASSY 1
* This unit includes the following parts.
#******** MAIN BOARD 1
#******** JACK BOARD 1
#******** VOLUME BOARD 1
#******** PS BOARD 1
#******** INLET BOARD 1
IC
# 5100039123 POWER AMP TDA2050L-TB5-T 2
DIODE
# 5100048310 LED L-7113-CW914(S) 1
POTENTIOMETER
5100033433 ROTARY POTENTIOMETER R0923NOCV1B103FE00A1 2
5100037963 ROTARY POTENTIOMETER R0923NOCH1B103FE00A1 6
FUSE, FUSE HOLDER
03673990 FUSE 5ST 1 1A/250V for low voltage 1
03674001 FUSE 5ST 630MA/250V for high voltage 1
5100000592 FUSE HOLDER FC-201(613-11617-01-00) 2

15
JC-40Nov. 2015
WIRING, CABLE
# 5100046171 WIRING W4 (1672#22-BLK) 2
# 5100046177 WIRING W5 (1015#22-RED) 1
# 5100046178 WIRING W6 (1015#22-BLK) 1
# 5100046179 WIRING W7 (1015#22-ORG) 1
# 5100046188 WIRING W8 (1015#22-BRN) 1
# 5100047043 WIRING W10 (1672#18-BLK/WHT) 1
5100033985 WIRING W14 1
# 5100046167 WIRING 1007#28 15X260-PHR-SAN-F 1
# 5100046170 WIRING 1007#28 2X230-PHR-SAN-F 1
# 5100046168 WIRING 1007#28 7X200-PHR-SAN-F 1
# 5100047044 WIRING 1007#28 8X90-PHR-SAN-F 1
TRANSFORMER
5100016080 POWER TRANS(461-11035-01-00) PT-AP018 100/117V for low voltage 1
5100016081 POWER TRANSFORMER PT-AP018 230/240V for high voltage 1
AC INLET, OUTLET
5100033643 AC INLET(610-11017-08-00) M1908-B W/ CCC MARK 1
SCREWS
40017934 SCREW M3X6 PAN MACHINE W/SW+PW(L) FE ZC 21
40012945 SCREW M3X6 PAN MACHINE W/SW+PW BZC 2
40013078 SCREW M3X10 PAN MACHINE W/SW FE ZC 2
40010489 SCREW M5X30 OVAL FE BZC 4
40010601 SCREW M5X35 ORIGINAL TRUSS MACHINE FE BZC 8
40011112 SCREW 3X10 BINDING TAPTITE B BZC 2
# 5100046058 SCREW 3X14 OVAL TAPPING A ED-BLK 2
40010678 SCREW 4X20 TRUSS TAPPING A FE BZC 6
40010689 SCREW 4X25 TRUSS TAPPING A FE BZC 4
40011767 FLANGE HEX NUT M4 FE ZC 3
40560756 FLANGE NUT M4 BZC 15
# 22150580 STANDOFF M3-L5.5-H7 6
# 5100044181 PLAIN WASHER 4.2X10X1 BZC 7
# 5100046055 SPRING WASHER 4.4X6.5X1 BZC 7
40230023 SPRING WASHER M4 ZC 2
40011889 EXTERNAL TOOTH WASHER M4 FECM 1
MISCELLANEOUS
22510402 BADGE G.AMP 61 1
22310207 HANDLE (H40) 231-207 W/ESCUCHEON (2 HOLES) 1
22340202 PROTECTION CORNER 8
# 5100046591 LED ESCUTCHEON 1
# 5100046595 POWER SW ESCUTCHEON 1
# 5100046034 RUBBER FOOT D25*T12 BLK 4
# 5100046593 JACK SPACER 11
# 5100046599 LED SPACER LEH5-6T 1
# 5100046598 POWER SW CUSHION 2
40013812 CAUTION SEAL IEC #142 1
# 5100046047 LABEL SPEAKER MAGNET 2
5100003695 TERMINAL PCB-12 2
5100027814 LOCKING CABLE TIE CV-100V0K 12
# 5100046602 ACETATE TAPE #156A 35X25XT0.25 2
# 5100048346 ACETATE TAPE NITTO #156A BLACK W20MM 30M -
40342901 SILICONE GREASE G-746 200G -
40122445 ADHESIVE CEMEDINE SUPER-X NO.8008 170G/135ML -
ACCESSORIES (Standard)
# 5100046052 OWNER'S MANUAL MULTILANGUAGE 1
03340956 AC CORD SET PSE 100V YA-101/YP-3NB/YC-13 for 100V 1
5100029165 AC CORD 115TW 2.5M SP301+IS14 VCTF for 115VTW 1
5100012292 AC CORD SET 117VBL 2.5M 3P DAIKEI 117VBL for 117VBL 1
00894378 AC CORD SET 120V SP301+IS14 SJT18/3 for 117VU, 117VU/CS 1
03450323 AC CORD SET 220V YP-36 YC-13D for 220VCN 1
5100013648 AC CORD SET 220VK 10A 3P-3P 2.5M for 220VK 1
00907001 AC CORD SET 240VE SP-62+IS-14 for 230VE 1
00894389 AC CORD SET 230V SP22+IS14 H05VV-F3G1.0 for 230VEU 1
5100013842 AC CORD SET 240VA 2.5M SAA HIRAKAWA for 240VA 1

16
Nov. 2015 JC-40
Verifying the Version
Perform verification in the test mode of the next section.
Test Mode
Items Required
• Oscillator
•Noisemeter
• Oscilloscope
• FS-5U (x 3)
or
• FS-5U (x 1), FS-6 (x 1)
* Set the POLARITY switch and MODE switch as shown below.
fig.FS-5U.eps
fig.FS-6.eps
• Dummy plug (monaural)
•Audiocables
Entering the Test Mode
1. Connect the FS-5U (or FS-6) to the FOOT SWITCH CHORUS VIBRATO,
REVERB and DISTORTION jacks.
2. Set BRI on the front panel to OFF.
3. Turn all knobs all the way counterclockwise.
4. Adjust the LOOP switch on the rear panel to SERIES.
5. Hold down the pedal connected to the CHORUS VIBRATO jack and turn
on the power.
6. When the LED flashes, release the pedal, and then immediately press and
release the pedal connected to the REVERB jack and the DISTORTION
jack in this order.
After the LED flashes several times rapidly, the unit enters the item of
Verifying the Version in the test mode.
Quitting the Test Mode
Turn off the power.
Skipping Test Items
Test items cannot be skipped.
Verifying the Version
The LED lights up to indicate the version as shown in the table below.
Press the pedal connected to the CHORUS VIBRATO jack to advance to
the next test item.
DSP Check
The LED lights up, then after approximately 2 seconds, if the DSP check
is OK, the LED goes dark and the execution automatically advances to
the next test item.
If the result is not OK, operation stops.
Switch Check
1. Connect the dummy plug to the INPUT L/MONO jack.
The LED lights up.
2. Disconnect the dummy plug.
The LED goes dark.
3. Connect the dummy plug to the INPUT R jack.
The LED lights up.
4. Disconnect the dummy plug.
The LED goes dark.
5. Connect the dummy plug to the PHONES jack.
The LED lights up.
6. Disconnect the dummy plug.
The LED goes dark.
7. Connect the dummy plug to the RETURN L/MONO jack.
The LED lights up.
8. Disconnect the dummy plug.
The LED goes dark.
9. Adjust the LOOP switch to PARALLEL.
The LED lights up.
10. Adjust the LOOP switch to SERIAL.
The LED goes dark.
11. Press BRI on the front panel to set it to ON.
The LED lights up.
12. Press BRI to set it to OFF.
The LED goes dark.
13. Adjust the VIB/CHORUS knob to OFF.
The LED lights up.
14. Adjust the VIB/CHORUS knob to MANUAL.
The LED goes dark.
15. Adjust the VIB/CHORUS knob to FIXED.
The LED flashes and execution automatically advances to the next test item.
Volume Check
1. Slowly turn the VOLUME knob clockwise.
When the knob is turned slightly, the LED goes dark, when the knob is
turned to near the twelve o'clock position, the LED lights up, and when
the knob is turned all the way clockwise, the LED flashes.
* At this time, sound is heard from the speaker.
2. In the same way, check the operation of the TREBLE, MIDDLE, BASS,
DISTORTION, REVERB, SPEED and DEPTH knobs.
When the checking reaches to the DEPTH knob, the LED flashes slowly.
3. Connect the dummy plug to the INPUT L/MONO jack.
The LED lights up and execution automatically advances to the next test
item.
FS-5U
FS-6
Version Flashing LED (repeats)
1.00 1 long flash
1.01 1 long flash and 1 short flash
1.02 1 long flash and 2 short flash
1.03 1 long flash and 3 short flash

17
JC-40Nov. 2015
Input/Output Check
1. Disconnect the speaker wiring from the L and R speaker terminals.
* If the speakers are connected, when the VIB/CHORUS knob is set to VIB on the next step, sound is produced at high volume.
* Be very careful so that the speaker terminals never touch to the other metal portion.
2. Set the VIB/CHORUS knob as shown in the table below, and verify that the output corresponding to the appropriate input can be achieved.
* When the sound is input to the INPUT L/MONO jack, connect the dummy plug to the INPUT R jack, and when the sound is input to the INPUT R jack,
connect the dummy plug to the INPUT L/MONO jack. And also, when the output signal from the LINE OUT L/MONO jack is checked, connect the dummy plug
to the LINE OUT R jack, and when the output signal from the LINE OUT R jack is checked, connect the dummy plug to the LINE OUT L/MONO jack.
* When the output from the PHONES jack is checked, connect 33Ω load resistors between L and GND, and between R and GND.
Speaker Output Check (Reference)
1. Adjust the VIB/CHORUS knob to MANUAL.
2. Connect a 4Ω load resistor to the L-channel speaker wirings (red and
black).
* If the resistor can not be prepared, connect the speaker instead.
3. Connect the noise meter to the L-channel speaker wirings.
4. Connect the oscillator to the EFFECT LOOP RETURN L/MONO jack and
connect the dummy plug to the Rjack.
5. Input the following signal to the EFFECT LOOP RETURN L/MONO jack.
RETURN L/MONO:1-kHz sine wave at -40 dBm
6. Verify that the output value of the speaker wirings is +7.5 dBm or higher.
* When the value above can not be achieved, change the dummy plug connected to
the RETURN R jack to the short plug.
7. Detach the noise meter and connect the oscilloscope.
8. Input the following signal to the EFFECT LOOP RETURN L/MONO jack.
RETURN L/MONO:1-kHz sine wave at -20 dBm
9. Verify that the output waveform from the speaker terminal is distorted as
shown in the figure below.
fig.test.eps
10. For the R-channel speaker wirings, verify in the same way as steps 2
through 9.
* Color of the R-channel speaker wirings are brown and orange.
* Connect the dummy plug to the EFFECT LOOP RETURN L/MONO jack and
input the signal to the Rjack.
11. Detach the oscillator and the oscilloscope.
12. Connect the speakers as they were.
Residual Noise Check (Reference)
1. Adjust the VIB/CHORUS knob to OFF.
2. Verify that the residual noise at the EFFECT LOOP SEND jack is as
follows.
-65 dBm or lower (DIN-audio)
3. Verify that the residual noises at the PHONES jack (L and R) are as
follows.
L: -65 dBm or less (DIN audio)
R: -65 dBm or less (DIN audio)
4. Verify that the residual noise at the L channel of the speaker is as follows.
-35 dBm or lower (DIN-audio)
5. Verify that the residual noise at the R channel of the speaker is as follows.
-35 dBm or lower (DIN-audio)
VIB/CHORUS
knob
Input jack Input signal
(1 kHz, sine wave)
Output jack Output value
VIB INPUT L/MONO -40 dBm LINE OUT L/MONO +7.5±2 dBm
VIB INPUT R -40 dBm LINE OUT R +7.5±2 dBm
VIB INPUT L/MONO -40 dBm EFFECT LOOP SEND -1.5±2 dBm
VIB INPUT R -40 dBm EFFECT LOOP SEND -1.5±2 dBm
OFF INPUT L/MONO -40 dBm EFFECT LOOP SEND -31.5±2 dBm
OFF INPUT R -40 dBm EFFECT LOOP SEND -31.5±2 dBm
MANUAL EFFECT LOOP RETURN L/MONO -40 dBm LINE OUT L/MONO -16±2 dBm
MANUAL EFFECT LOOP RETURN R -40 dBm LINE OUT R -16±2 dBm
MANUAL EFFECT LOOP RETURN L/MONO -40 dBm PHONES L -18±2 dBm
MANUAL EFFECT LOOP RETURN L/MONO -40 dBm PHONES R -22±2 dBm
MANUAL EFFECT LOOP RETURN R -40 dBm PHONES L -22±2 dBm
MANUAL EFFECT LOOP RETURN R -40 dBm PHONES R -18±2 dBm
MANUAL EFFECT LOOP RETURN L/MONO -10 dBm PHONES L (verify that the sound clips)
MANUAL EFFECT LOOP RETURN R -10 dBm PHONES R (verify that the sound clips)

18
Nov. 2015 JC-40
Circuit Board (Main, Jack, Volume, PS, Inlet Board)
fig.b-main-1.eps

19
JC-40Nov. 2015
fig.b-main-2.eps

20
Nov. 2015 JC-40
Circuit Diagram (Main Board: 1/4)
fig.d-main-1.eps@L
DG
D+3.3V
DG
D+3.3V
DG
RESET
DG
DG
DG
DG
D+1.5V
DG
D+3.3V
FC_TX
DG
D+3.3V
DG
WP_EEPROM_PROG
RESET
REF
DG
FC_RX
WP
DG
SDA
SCL
REF
DGDGDG
DG
D+3.3V
D+3.3V
DG
D+3.3V
REF+3.3V
REF
D+3.3V
EA6
REF+3.3V
REF
ADVR7 ADVR6
REF
REF+3.3V
ADVR5
REF
REF+3.3V
ADVR4
REF
REF+3.3V
ADVR3
REF
REF+3.3V
ADVR7
ADVR6
ADVR5
ADVR4
ADVR3
SW_CHO1
SW_CHO2
SW_CHO3
WP_EEPROM_PROG
AD2
DG DG
MCK
BCK
LRCK
DA1
ADVR2
DG
REF
REF+3.3V
REF
ADVR2
AD0
DG
DA0R
DA0L
AD1
DG
VR_GND
DG
VR_GND
DG
VR_GND
DG
VR_GND
DG
VR_GND
DG
VR_GND
DGREF
REF DG
REF
REF+3.3V
B6B-PH-SM4-TB (LF)(SN) CN10
11 22 33
44
55
66
S-80130ANMC-JCPT2G
IC17
5VDD
2VSS
1DS
3
NC
4
OUT
RA3
EXB28V221JX
220
1
18 8
6
6
5
5
4
4
3
3
2
27 7
RA13
EXB28V221JX
220
1
18 8
6
6
5
5
4
4
3
3
2
27 7
RA10
EXB28V470JX
18
6
54
3
27
RA11
EXB28V470JX 18
6
54
3
27
10uF
C164
10uF
C175
10uF
C150
IC12
M245
E2
3
E1
2
E0
1
SDA
5
SCL
6
_WC
7
10
R132 47
R145
47
R144
3.3k
R127 3.3k
R126
10k
R128
47
R98
100
R124 100
R172
100
R176
150
R136 150
R137
150
R138
150
R139
100
R130 100
R163
150
R160
2.7k
R120
10k
R129
10k
R105
10k
R123
47k
R131
100pF
C176
100pF
C191
0.1uF
C163
0.1uF
C174
0.1uF
C159
0.1uF
C162
0.1uF
C320
0.1uF
C160
22pF
C305
22pF
C304
22pF
C267
22pF
C306
22pF
C193
0.1uF
C172
0.1uF
C173
0.1uF C166
0.1uF C259 0.1uF C247
0.1uF C217
0.1uF
C171
0.1uF
C170
12pF
C157
15pF
C158
R0923NOCH1B103FE00A1
VR5
20
R0923NOCH1B103FE00A1
VR6
20
R0923NOCH1B103FE00A1
VR6
10
R0923NOCH1B103FE00A1
VR3
20
R0923NOCH1B103FE00A1
VR2
20
R0923NOCH1B103FE00A1
VR4
10
R0923NOCH1B103FE00A1
VR4
20
R0923NOCH1B103FE00A1
VR3
10
R0923NOCH1B103FE00A1
VR5
10
R0923NOCH1B103FE00A1
VR2
10
VR6 R0923NOCH1B103FE00A1
13
2
VR3
R0923NOCH1B103FE00A1
13
2
VR4
R0923NOCH1B103FE00A1
13
2
VR2 R0923NOCH1B103FE00A1
13
2
VR5
R0923NOCH1B103FE00A1
13
2
B8B-PH-SM4-TB (LF)(SN)
CN5
11
22
33
44
55
66
7
78
8
R0923NOCH1B103FE00A1
VR7
20
R0923NOCH1B103FE00A1
VR7
10
VR7 R0923NOCH1B103FE00A1
13
2
TC7W08FU(TE12L.F)
IC14
1
2
7
22pF
C33
150
R148
DSX321G 18.432MHZ
X1
11
2
NC 4
NC
3
3
88
87
86
134
133
139
140
98
99
135
136
137
142
143
81
70
79
80
102
103
104
105
106
84
85
95
94
93
92
91
90
89
71
74
75
76
77
119
118
110
111
107
112
113
116
117
0
R67
0.1uF
C276
0.1uF
C277
0.1uF
C278
0.1uF
C279
0.1uF
C280
0.1uF
C281
0.1uF
C347
0.1uF
C348
C34910uF16V
FOR UPDATE
From VOLUME BOARD
DG
DG
RESET
REF+3.3V
REFREF
REF+3.3V
REF
REF+3.3VREF+3.3V
REF
REF+3.3V
REFREF
REF+3.3V
REF
REF+3.3V
REF
REF+3.3V
1SS362FV(TPL3)
D59
UnPop
2
3
1
1SS362FV(TPL3)
D60
UnPop
2
3
1
1SS362FV(TPL3)
D57
UnPop
2
3
1
1SS362FV(TPL3)
D58
UnPop
2
3
1
1SS362FV(TPL3)
D28 UnPop
2
3
1
1SS362FV(TPL3)
D29 UnPop
2
3
1
1SS362FV(TPL3)
D8 UnPop
2
3
1
1SS362FV(TPL3)
D17 UnPop
2
3
1
B8B-PH-K-S (LF)(SN)
CN2
UnPop
1
1
2
2
3
3
4
4
5
5
6
6
77
88
B6B-PH-K-S (LF)(SN)
CN8
UnPop
1
12
23
34
45
56
6
1k
R150
UnPop
1000pF
C303
UnPop