Roland AC-40 Operating and maintenance manual

SERVICE NOTES
Issued by RJA
Copyright © 2013 Roland Corporation
All rights reserved. No part of this publication may be reproduced in any form without the written permission
of Roland Corporation.
CC-OKN17058881E0
Jul. 2013 AC-40
Table of Contents
Cautionary Notes ..............................................................2
Specifications .....................................................................3
Location of Controls .........................................................4
Location of Controls Parts List........................................5
Exploded View (All) .........................................................6
Exploded View (All) Parts List........................................7
Plane View (1)....................................................................8
Plane View (1) Parts List ..................................................8
Plane View (2)....................................................................9
Plane View (2) Parts List ..................................................9
Exploded View (Fig. A)..................................................10
Exploded View (Fig. A) Parts List ................................11
Plane View (Fig. A) .........................................................12
Plane View (Fig. A) Parts List........................................13
Application Sites for EVA Packing Cushions .............14
Parts List ...........................................................................16
Verifying the Version......................................................18
Test Mode .........................................................................18
Input/Output Level Test (for Reference) ....................19
Wiring Diagram/Block Diagram..................................20
Circuit Board (Main Board) ...........................................22
Circuit Diagram (Main Board: 1/3)..............................24
Circuit Diagram (Main Board: 2/3)..............................26
Circuit Diagram (Main Board: 3/3)..............................28
Circuit Board (GT Input, Panel, Jack, Mic Input Board)
............................................................................................30
Circuit Diagram (GT Input Board) ...............................31
Circuit Diagram (Panel Board)......................................32
Circuit Diagram (Jack Board) ........................................34
Circuit Diagram (Mic Input Board) ..............................36

2
Jul. 2013 AC-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.
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
Jul. 2013 AC-40
Specifications
Roland AC-40: ACOUSTIC GUITAR AMPLIFIER
Rated Power Output
35 W (17.5 W + 17.5 W)
Nominal Input Level (1 kHz)
GUITAR CHANNEL: -10 dBu
MIC/LINE CHANNEL: -50 dBu/-20 dBu
AUX IN: -10 dBu
Nominal Output Level (1 kHz)
LINE OUT: -10 dBu
Speakers
16 cm (6.5 inches) x 2
Controls
[GUITAR CHANNEL]
VOLUME knob
BASS knob
MIDDLE knob
TREBLE knob
CHORUS switch (OFF, SPACE, WIDE)
REVERB knob
[MIC/LINE CHANNEL]
VOLUME knob
BASS knob
MIDDLE knob
TREBLE knob
CHORUS switch (OFF, SPACE, WIDE)
REVERB knob
[ANTI-FEEDBACK]
ON/OFF switch
[AUX IN]
LEVEL knob
MASTER knob
POWER switch
Indicator
POWER
Connectors
GUITAR CHANNEL INPUT jack: 1/4” phone type
MIC/LINE CHANNEL INPUT jack: XLR type, 1/4” TRS phone type
AUX IN jack: Stereo miniature phone type
LINE OUT (L/MONO, R) jacks: 1/4” phone type
PHONES jack: Stereo miniature phone type
FOOT SW jack: 1/4” TRS phone type
DC IN jack
Power Supply
AC Adaptor
Current Draw
480 mA
Dimensions
362 (W) x 241 (D) x 265 (H) mm
14-1/4 (W) x 9-1/2 (D) x 10-7/16 (H) inches
Weight
5.3 kg
11 lbs 11 oz
Accessories
Owner’s Manual (#5100033164)
AC Adaptor (#5100010587)
Power Cord (#5100012740, #5100009482, #5100009484, #5100009483,
#5100009485)
Options (sold separately)
Footswitch: BOSS FS-5U, BOSS FS-6
Connection Cable: PCS-31L
* 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
Jul. 2013 AC-40
Location of Controls
fig.panel.eps
1 2 3 4 3
5
10 11 13 1412
6 87
9 1

5
Jul. 2013 AC-40
Location of Controls Parts List
No. Part Code Part Name Description Q’ty
1 13449146 6.5MM JACK YKB21-5012 (W/SW) 3
22150756 JACK NUT 2 PLASTIC/BLK 3
2 5100011024 R-KNOB(SD000083) 08203-500(40A-KAC-60-B) 2
5100033257 ROTARY POTENTIOMETER R0923NOCH1P104FD20B4 2
* This unit includes the following parts.
******** VR NUT M9 2
******** VR MASHER 2
3 5100011024 R-KNOB(SD000083) 08203-500(40A-KAC-60-B) 9
5100033256 ROTARY POTENTIOMETER R0923NOCV1B103FD20A1 9
* This unit includes the following parts.
******** VR NUT M9 9
******** VR MASHER 9
4 5100007725 SWITCH SS71020F-0103-6T-025-NP-017 2
5 5100014678 CANNON CONNECTOR CT/PJ-02-EP(610-09064-03-00) 1
6 5100007726 SWITCH SS71010F-0102-6T-015-NP 1
7 03349978 LED(RED) L-34HDSL-FPB 1
5100004216 LED SPACER LEDH-7 1
8 02897801 SEESAW SWITCH SDDJE13200 94V-0 1
5100033167 WIRING W3 1
9 5100010457 DC PLUG SUPPORTER 1
10 03562412 DC JACK HEC3900-010110 1
5100009659 DC JACK HOLDER 350-AP011-DH(750-11041-01-00) 1
11 04452956 3.5MM JACK YKB21-5401N 1
12 5100007731 ROTARY POT(231-11041-03-00) R1131GOXH1B203TG0027 1
13 05019512 3.5MM JACK HTJ-035-09ABT 1
14 13449252 6.5MM JACK YKB21-5006 (STEREO W/SW) 1
22150756 JACK NUT 2 PLASTIC/BLK 1

6
Jul. 2013 AC-40
Exploded View (All)
fig.bunkai-all.eps
Refer to Fig.A
View 1
1
7
8
11
9
5
3
2
10
4
6
View 2
View 3
View 4
RED
(#5100033172)
ORANGE
(#5100033174)
BROWN
(#5100033175)
BLACK
(#5100033173)
*Terminals are on the inside.

7
Jul. 2013 AC-40
Exploded View (All) Parts List
No. Part Code Part Name Description Q’ty
1 5100033223 CABINET ASSY 1
* This unit includes the following parts.
2 5100006069 RUBBER FOOT(430-BG-435) D25XT18 40484-512(SD001005) 4
3 5100009863 STAND HOLDER(40E-1BG-435) 40484-518 (#SD001007) 2
4 5100009860 STAND 08203-016 (#SD001169) 1
10 5100023934 CATCH D17.5 4
5 5100033222 NET BOARD ASSY 1
* This unit includes the following parts.
******** ROLAND BADGE 1
******** NET BOARD 1
6 5100033274 SPEAKER W6504-041A 2
7 5100011383 HANDLE HOLDER 2
8 5100011382 HANDLE PLATE 750-11038-03-00 1
9 5100011381 HANDLE 716-11038-01-00 1
11 5100036989 NITTO ACETATE TAPE #5 BLACK W12MM -

8
Jul. 2013 AC-40
Plane View (1)
fig.heimen1.eps
Plane View (1) Parts List
View 1
View 2
View 2
View 1
c
a
d
b
No. Part Code Part Name Description Q’ty
a 40237101 SCREW M3X8 PAN MACHINE W/SW+SMALL PW BZC 2
b 40010667 SCREW 4X16 TRUSS TAPPING A FE BZC 3
No. Part Code Part Name Description Q’ty
c 40011312 SCREW 3X8 BINDING TAPTITE P FE BZC 2
d 40564601 SCREW M5X35 OVALHEAD MACHINE BZC 2

9
Jul. 2013 AC-40
Plane View (2)
fig.heimen2.eps
Plane View (2) Parts List
View 3
View 4
View 4
View 3
ee
f f
g h
No. Part Code Part Name Description Q’ty
e 40010367 SCREW M4X25 BINDING MACHINE BZC 8
No. Part Code Part Name Description Q’ty
f 40012501 SCREW 4X12 BINDING TAPTITE P FE BZC 4
g 40567034 SCREW 4X20 BINDING TAPTITE P BZC 4
h 5100005100 WASHER FLAT 4.2X10X0.5 BZC 4

10
Jul. 2013 AC-40
Exploded View (Fig. A)
fig.bunkai-A-e.eps
View A3
View A2
View A1
Solder
2locations
(wound)
Solder
2locations
(wound)
*Theendofthewiremustnotextend
belowtheconnector.
Windthewiring(#5100033167)
aroundthepowerswitchandsolder.
Securethewiringinplaceusingaclamp.
20–25mm
1
4
5
17
11
9
19
18
16
10
15
13
12
14
6
1
7
8
3
2

11
Jul. 2013 AC-40
Exploded View (Fig. A) Parts List
No. Part Code Part Name Description Q’ty
1 22150756 JACK NUT 2 PLASTIC/BLK 4
2 5100011024 R-KNOB(SD000083) 08203-500(40A-KAC-60-B) 11
3 ******** VR NUT M9 attached to potentiometer 11
******** VR MASHER attached to potentiometer 11
4 02897801 SEESAW SWITCH SDDJE13200 94V-0 1
5 5100010457 DC PLUG SUPPORTER 1
6 5100033207 CHASSIS 1
7 5100036137 CUSHION SLIDE SW 3
8 5100036138 HIMELON SLIDE SW 3
5100032329 PANEL SHEET ASSY 1
* This unit includes the following parts.
9 ******** GT INPUT BOARD 1
10 ******** MIC INPUT BOARD 1
11 ******** PANEL BOARD 1
12 ******** JACK BOARD 1
13 5100033242 MAIN BOARD ASSY 1
14 5100011021 STANDOFF M3-L6-H20 (311-BG436) 2
15 5100035706 CUSHION CHASSIS TOP L 1
16 5100035707 CUSHION CHASSIS TOP C 1
17 5100035705 CUSHION CHASSIS TOP R 1
18 5100035709 HIMERON CHASSIS REAR S 2
19 5100035708 HIMERON CHASSIS REAR L 1

12
Jul. 2013 AC-40
Plane View (Fig. A)
fig.heimenA.eps
View A1
View A3
View A2
a
a
a

13
Jul. 2013 AC-40
Plane View (Fig. A) Parts List
View A1
View A2
View A3
No. Part Code Part Name Description Q’ty
a 40012867 SCREW M3X8 PAN MACHINE W/SW+PW ZC 5
No. Part Code Part Name Description Q’ty
a 40012867 SCREW M3X8 PAN MACHINE W/SW+PW ZC 1
No. Part Code Part Name Description Q’ty
a 40012867 SCREW M3X8 PAN MACHINE W/SW+PW ZC 2

14
Jul. 2013 AC-40
Application Sites for EVA Packing Cushions
Mic Input Board
Give attention to the following point when affixing the EVA Packing
(#5100011617) onto the MIC/LINE CHANNEL INPUT jack.
fig.eva-mic-e.eps
GT Input Board
As shown in the figure, affix the EVA Packing (#5100027144) onto the GT
CHANNEL INPUT jack.
fig.eva-gt-e.eps
Jack Board
As shown in the figure, affix the EVA Packing (#5100027144, #5100027145 and
#5100010540) and Mini Jack Cushion (#5100032494) onto the respective jacks.
fig.eva-jack-e.eps
Panel Board
Give attention to the following point when affixing the EVA Packing
(#5100027157) around the wiring (#5100033167).
fig.eva-panel-e.eps
Chassis
Give attention to the following point when affixing the Cushion (#5100035705,
#5100035706 and #5100035707).
fig.eva-chassis-e.eps
OK
Starting point for attaching
Not OK
* Ensure no gaps between the
material and the surface.
Starting point
for attaching
EVAPacking
(#5100010540)
EVAPacking
(#5100027144)
EVAPacking
(#5100027145)
MiniJackCushion
(#5100032494)x2
OK
EVA PAKING
(#5100027157)
Not OK
Starting point
for attaching
Wrapping method
Overlap, with Cushion (CHASSIS TOP C) on top.
Affix within 1mm from the edge

15
Jul. 2013 AC-40

16
Jul. 2013 AC-40
Parts List
fig.-part1-e.eps
Safety Precautions:
The parts marked have
safety-related characteristics. Use
only listed parts for replacement.
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.
• Part supplied only as a component in a complete assembly
• Copyright does not permit the part to be supplied
• Part is sold commercially
CASING
# 5100033223 CABINET ASSY 1
# 5100033222 NET BOARD ASSY 1
5100009860 STAND 08203-016 (#SD001169) 1
CHASSIS
# 5100033207 CHASSIS 1
KNOB, BUTTON
5100011024 R-KNOB(SD000083) 08203-500(40A-KAC-60-B) 11
SWITCH
02897801 SEESAW SWITCH SDDJE13200 94V-0 1
5100007726 SWITCH SS71010F-0102-6T-015-NP 1
5100007725 SWITCH SS71020F-0103-6T-025-NP-017 2
JACK, EXT TERMINAL
04452956 3.5MM JACK YKB21-5401N 1
05019512 3.5MM JACK HTJ-035-09ABT 1
13449146 6.5MM JACK YKB21-5012 (W/SW) 3
13449252 6.5MM JACK YKB21-5006 (STEREO W/SW) 1
5100014678 CANNON CONNECTOR CT/PJ-02-EP(610-09064-03-00) 1
03562412 DC JACK HEC3900-010110 1
SPEAKER, BUZZER
# 5100033274 SPEAKER W6504-041A 2
PWB ASSY
# 5100033242 MAIN BOARD ASSY 1
# 5100032329 PANEL SHEET ASSY 1
* This unit includes the following parts.
******** PANEL BOARD 1
******** GT INPUT BOARD 1
******** MIC INPUT BOARD 1
******** JACK BOARD 1
DIODE
03349978 LED(RED) L-34HDSL-FPB 1
POTENTIOMETER
# 5100033257 ROTARY POTENTIOMETER R0923NOCH1P104FD20B4 2
# 5100033256 ROTARY POTENTIOMETER R0923NOCV1B103FD20A1 9
5100007731 ROTARY POT(231-11041-03-00) R1131GOXH1B203TG0027 1
FUSE, FUSE HOLDER
5100005125 FUSE MRT3.15 F200 on Jack Board 1
# 5100005117 FUSE MRT80 F300 on Main Board 1
5100005118 FUSE MRT100(472-11032-03-00) F2 on Main Board 1

17
Jul. 2013 AC-40
WIRING, CABLE
# 5100033165 WIRING W1 1
# 5100033166 WIRING W2 1
# 5100033167 WIRING W3 1
# 5100033168 WIRING W4 1
# 5100033169 WIRING W5 1
# 5100033170 WIRING W6 1
# 5100033171 WIRING W7 1
# 5100033172 WIRING W8 1
# 5100033173 WIRING W9 1
# 5100033174 WIRING W10 1
# 5100033175 WIRING W11 1
# 5100033176 WIRING W12 1
SCREWS
40237101 SCREW M3X8 PAN MACHINE W/SW+SMALL PW BZC 2
40012867 SCREW M3X8 PAN MACHINE W/SW+PW ZC 8
40010367 SCREW M4X25 BINDING MACHINE BZC 8
40564601 SCREW M5X35 OVALHEAD MACHINE BZC 2
40011312 SCREW 3X8 BINDING TAPTITE P FE BZC 2
40012501 SCREW 4X12 BINDING TAPTITE P FE BZC 4
40010667 SCREW 4X16 TRUSS TAPPING A FE BZC 3
40567034 SCREW 4X20 BINDING TAPTITE P BZC 4
22150756 JACK NUT 2 PLASTIC/BLK 4
5100011021 STANDOFF M3-L6-H20 (311-BG436) 2
5100005100 WASHER FLAT 4.2X10X0.5 BZC 4
MISCELLANEOUS
5100011381 HANDLE 716-11038-01-00 1
5100011383 HANDLE HOLDER 2
5100011382 HANDLE PLATE 750-11038-03-00 1
5100009659 DC JACK HOLDER 350-AP011-DH(750-11041-01-00) 1
5100010457 DC PLUG SUPPORTER 1
5100023934 CATCH D17.5 4
5100006069 RUBBER FOOT(430-BG-435) D25XT18 40484-512(SD001005) 4
5100009863 STAND HOLDER(40E-1BG-435) 40484-518 (#SD001007) 2
5100004216 LED SPACER LEDH-7 1
5100027814 LOCKING CABLE TIE CV-100V0K 1
# 5100036137 CUSHION SLIDE SW 3
# 5100035705 CUSHION CHASSIS TOP R 1
# 5100035706 CUSHION CHASSIS TOP L 1
# 5100035707 CUSHION CHASSIS TOP C 1
5100032494 MINI JACK CUSHION 761-12020-02-00 2
5100011617 EVA PACKING 40X25X1T W/ADH(762-11041-06-0 1
5100027157 EVA PACKING CABINET 08632-529 1
5100010541 EVA PACKING FOR DC JACK HOLDER 1
5100010540 EVA PACKING(429-AP011-DH) FOR DC JACK HOLDER A 1
5100027145 EVA PACKING MINI JACK 08632-526 2
5100027144 EVA PACKING PHONE JACK 08632-528 4
# 5100036138 HIMELON SLIDE SW 3
# 5100035709 HIMERON CHASSIS REAR S 2
# 5100035708 HIMERON CHASSIS REAR L 1
5100036989 NITTO ACETATE TAPE #5 BLACK W12MM -
ACCESSORIES (Standard)
5100010587 AC ADAPTOR PSB-12U 1
5100009481 AC CORD 181-AP009-J 100V 1.0M for 100V 1
5100012740 AC CORD 181-AP009-BL 117VBL 1.0M for 117VBL 1
5100009482 AC CORD 181-AP009-UC 117V 1.0M for 117VU, 117VU/CS 1
5100009484 AC CORD 181-AP009-B 230VE for 230VE 1
5100009483 AC CORD 181-AP009-G 181-AP009-G 230V EU 1.0M for 230VEU 1
5100009485 AC CORD 181-AP009-A 240VA 1.0M for 240VA 1
# 5100033164 OWNER’S MANUAL MULTILANGUAGE 1
# 5100033163 OWNER’S MANUAL JAPANESE 1

18
Jul. 2013 AC-40
Verifying the Version
Items Required
• Foot switch (FS-5U x 2 or FS-6 x 1)
* Set the POLARITY switch and the MODE switch on the foot switch as shown
below.
fig.FS-5U.eps
fig.FS-6.eps
• Foot-switch connection cable (PCS-31 or PCS-33)
• Dummy plug
Procedure
1. Connect a foot switch to the FOOT SW jack.
* If you’re using a PCS-31 cable, white is for tip and red is for ring. If you’re
using a PCS-33 cable, the pedal connected to B on the FS-6 is for tip and the
pedal connected to A is for ring. Also check the panel indication on the FS-6.
2. Make the following settings on the main unit.
• POWER SW: OFF
• GUITAR CHANNEL CHORUS: OFF
• MIC/LINE CHANNEL CHORUS: OFF
• ANTI-FEEDBACK SW: OFF
• All controls: minimum (0)
3. Insert a dummy plug into the PHONES jack.
4. Hold down the ring section of the foot switch connected to the FOOT SW
jack and switch on the power.
Immediately after the power is switched on, all LEDs light up.
* Continue to hold down the foot switch.
5. After all LEDs have lighted up and then flashed once, within 3 seconds,
depress first the ring section and then the tip section of the foot switch.
The POWER LED flashes rapidly several times, then flashes to indicate
the software version.
The POWER LED lights up in an intermittent pattern that indicates the
software version as shown below.
6. Switch off the power to the unit.
Test Mode
Items Required
• Foot switch (FS-5U x 2 or FS-6 x 1)
• Foot-switch connection cable (PCS-31 or PCS-33)
• Stereo miniature phone plug x 1
Entering the Test Mode
Carry out steps 1through 5of Verifying the Version (p. 18).
After verifying the version, depress the ring section of the foot switch
connected to the FOOT SW jack to enter the first test item, 1. DSP/
SDRAM Test (p. 18).
Quitting the Test Mode
Switch off the power.
Skipping Test Items
Test items cannot be skipped.
1. DSP/SDRAM Test
When the unit enters the Test Mode, DSP/SDRAM Test starts
automatically.
While testing is in progress, the POWER LED goes dark.
If the test is passed (OK)
After approximately 5 seconds, the POWER LED lights up, and
execution automatically advances to the next test.
If the test is failed (not OK)
The POWER LED flashes rapidly. Execution does not advance to the next
test.
2. Switch Test
Carry out operations in the sequence shown below, and check the status
of the POWER LED.
* If an error is made in the order of operations, or of a test is failed, execution
cannot advance to the next test.
o: lights, -: goes off
When all switch testing are completed, the POWER LED flash.
Version POWER LED illumination pattern
1.00 One long and no short
1.01 One long and one short
1.02 One long and two short
1.03 One long and three short
: :
2.00 Two long and no short
FS-5U
FS-6
No. Operation POWER LED
(Initial state) o
1 Set GUITAR CHANNEL CHORUS to SPACE. -
2 Set GUITAR CHANNEL CHORUS to WIDE. o
3 Set MIC/LINE CHANNEL CHORUS to SPACE. -
4 Set MIC/LINE CHANNEL CHORUS to WIDE. o
5 Set ANTI-FEEDBACK to ON. -
6 Disconnect the foot-switch plug. o
7 Disconnect the stereo miniature phone plug from
PHONES.
-

19
Jul. 2013 AC-40
3. Volume Check
Working in the sequence shown below, change the settings of the
controls from minimum to intermediate and to maximum and vice versa,
and verify that the LEDs light up and the speaker plays sound.
* Operation out of sequence is ignored.
1. GUITAR CHANNEL BASS
2. GUITAR CHANNEL MIDDLE
3. GUITAR CHANNEL TREBLE
4. GUITAR CHANNEL REVERB
5. MASTER
6. MIC/LINE CHANNEL REVERB
7. MIC/LINE CHANNEL TREBLE
8. MIC/LINE CHANNEL MIDDLE
9. MIC/LINE CHANNEL BASS
o: lights, *: flashes, -: goes off
The volume level of the speaker sound increases as the control is
operated toward the maximum position, and from the intermediate
position, the pitch rises.
When all volume testing has been completed, the POWER LED flashes
slowly.
Switch off the power.
This ends the Test Mode.
Input/Output Level Test
(for Reference)
Items Required
• Level meter
• Signal generator
• Dummy load resistor tool
-4Ωload resistor
- 1/4-inch phone plug with 47 kΩload resister
- Stereo miniature phone plug with 100 Ωload resistor
Procedure
1. Switch on the power and start the unit in the normal usage state.
2. Make the following settings on the main unit.
Speaker Output Verification
1. Connect a 4 Ωload resistor to the speaker lines.
2. Connect the signal generator to the MIC/LINE CHANNEL INPUT jack and
input the following signal.
1-kHz sine wave at -43.0 dBm
3. Verify that signals like the following are output from the speaker lines.
SP OUT L: +19.0±1.5 dBm
SP OUT R: +19.0±1.5 dBm
4. Connect the signal generator to the AUX IN STEREO jack and input the
following signal to the L channel.
1-kHz sine wave at -30.8 dBm
5. Verify that signals like the following are output from the speaker lines.
SP OUT L: +19.0±1.5 dBm
SP OUT R: +19.0±1.5 dBm
6. Input the following signal to the R channel of the AUX IN STEREO jack.
1-kHz sine wave at -30.8 dBm
7. Verify that signals like the following are output from the speaker lines.
SP OUT L: +19.0±1.5 dBm
SP OUT R: +19.0±1.5 dBm
8. Connect the signal generator to the GUITAR CHANNEL INPUT jack and
input the following signal.
1-kHz sine wave at -19.2 dBm
9. Verify that signals like the following are output from the speaker lines.
SP OUT L: +19.0±1.5 dBm
SP OUT R: +19.0±1.5 dBm
LINE OUT Verification
1. Connect a 1/4-inch phone plug with a 47-kΩload resistor to the LINE
OUT L/MONO and Rjacks.
2. Connect the signal generator to the GUITAR CHANNEL INPUT jack and
input the following signal.
1-kHz sine wave at -3.6 dBm
3. Verify that signals like the following are output from the LINE OUT L
and Rjacks.
LINE OUT L: +3.0±1.5 dBm
LINE OUT R: +3.0±1.5 dBm
Headphones Output Verification
1. Connect a stereo miniature phone plug with a 100 Ωload resistor to the
PHONES jack.
2. Connect the signal generator to the GUITAR CHANNEL INPUT jack and
input the following signal.
1-kHz sine wave at -23.5 dBm
3. Verify that signals like the following are output from the PHONES jack.
PHONES L: +4.9±1.5 dBm
PHONES R: +4.9±1.5 dBm
Control position POWER LED
(Initial state) *
0 -
Center o
10 o
Controls and switches Controls and switches position
GUITAR CHANNEL REVERB,
MIC/LINE CHANNEL REVERB
0
GUITAR CHANNEL BASS/
MIDDLE/TREBLE, MIC/LINE
CHANNEL BASS/MIDDLE/
TREBLE
Center
GUITAR CHANNEL VOLUME,
MIC/LINE CHANNEL VOLUME,
AUX LEVEL, MASTER
10
GUITAR CHANNEL CHORUS,
MIC/LINE CHANNEL CHORUS,
ANTI-FEEDBACK
OFF

20
Jul. 2013 AC-40
Wiring Diagram/Block Diagram
fig.block.eps@L
1
2
8
9
10
11
12
7