Infinity 7540a User manual

Reference Series
7540a
7541a
4 CHANNEL POWER AMPLIFIER
SERVICE MANUAL
Infinity Systems, Inc.
250 Crossways Park Dr.
Woodbury, New York 11797 Rev310/2005

- CONTENTS -
SPECIFICATIONS ………………………………….……..1
FEATURES/TEST CONDITIONS……..…………………2
CONTROLS/CONNECTIONS………….……..…...…..…3
INSTALLATION………………….……...……..…...…...…5
BASIC TROUBLESHOOTING..…….…….………………6
TYPICAL SYSTEM WIRING..…….…….……………..…7
EXPLODED VIEW/PARTS LIST…….….….…………....8
MECHANICAL PARTS LIST……………..…………........9
AMPLIFIER BLOCK DIAGRAM…………………………10
P.C.B. DRAWINGS….…………………………………….11
ELECTRICAL PARTS LIST ……………………………. 15
REF 7541a ELECTRICAL PARTS LIST ADDENDUM….……18
IC/TRANSISTOR PINOUTS..………………………. …..19
REF 7540a SCHEMATICS……………………………....22
REF 7541a SCHEMATICS…………………………..…..25
PACKING……..……………………………………..…....28
Reference 7540a/7541a Specifications
Output Power: 111W RMS x 4 channels @ 4 ohms; ≤1% THD + N
(14.4V supply) 139W RMS x 4 channels @ 2 ohms; ≤1% THD + N
278W RMS x 2 channels @ 4 ohms; ≤1% THD + N
Signal-to-noise ratio: 81dBA (reference 1W into 4 ohms)
Dynamic power: 164W @ 2 ohms
Effective damping factor: 6.315 @ 4 ohms
Frequency response: 10Hz – 100kHz (–3dB)
Maximum input signal: 5.5V
Maximum sensitivity: Reference 7540a - 230mV
Reference 7541a - 75mV
DC Offset <50mV (-50%)
Output regulation: .088dB @ 4 ohms
Idle Current 1.2A
Input Impedance 22kΩ
Max Current Draw 54A @ 4 ohms
83A @ 2 ohms
Dimensions: 12 x 15 x 2 11/16” (L x W x D)
(305mm x 381mm x 68mm)
Fuses: 30A x 2
Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and details in
this and related JBL publications are therefore subject to change without notice.
1
Power Amplifier Reference 7540a/7541a

Reference 7540a/7541a
2

2
•
If the amplifier’s fuse must be replaced, use
only the same type and rating as that of the
original. Do not substitute another kind.
The Reference amplifiers are capable of
delivering high power levels, and require a
reliable connection to the vehicle’s electrical
system in order to perform optimally. See
Figure 1 for connection location. Please
adhere to the following instructions carefully.
GROUND CONNECTION
Connect the amplifier’s Ground (GND) terminal
to a solid point on the vehicle’s metal chassis,
as close to the amplifier as possible. Refer to the
chart below to determine minimum wire-gauge
size. Sand away any paint from this location; use
a star-type-lock washer to secure the connection.
POWER CONNECTION
Connect a wire (see chart at right for appropriate
gauge) directly to the vehicle’s positive battery
terminal, and install an appropriate fuse holder
within 18" of the battery terminal. Do not
install the fuse at this time. Route the wire to
the amplifier’s location, and connect it to the
amplifier’s positive (+12V) terminal. Be sure to
use appropriate grommets whenever routing
wires through the firewall or other sheet metal.
Failure to adequately protect the positive wire
from potential damage may result in a vehicle
fire. When you are done routing and connecting
this wire to the battery and to the amplifier,
you may install the fuse at the battery.The
fuse value should be selected based on total
amplifier-current draw; see chart at right.
REMOTE CONNECTION
Connect the amplifier’s Remote (REMOTE)
terminal to the source unit’s RemoteTurn-On
lead using a minimum of 18-gauge wire. If your
source unit does not have a remote turn-on
connection, connect the amplifier’s (REMOTE)
terminal to the vehicle’s accessory circuit.
WIRE-GAUGE CHART
Amplifier Maximum Minimum
Model Current Draw Wire Gauge
7520a 34A #8 AWG
7540a/7541a 85A #8 AWG
These recommendations assume 7' – 10' wire
runs. If your installation differs markedly, you
will need to adjust the wire gauge accordingly.
SPEAKER CONNECTIONS
Refer to the application guides on the pages
that follow. Speaker connections should be
made using a minimum of 16-gauge wire.
HIGH-LEVEL INPUT CONNECTIONS
The 7540a/7541a amplifiers are
equipped with speaker-level inputs that allow
you to add an amplifier to head units that do
not have RCA line outputs.The speaker outputs
for the source unit should be connected to the
amplifier using the supplied connector (square
four-wire plug). Remember to check for proper
polarity.
NOTE: When using the low-level or high-level
inputs, the AUX outputs can be used to pass a
full-range line-level signal to another amplifier.
Figure 2. Speaker-level connector.
POWER CONNECTIONS
Figure 1.Terminal-connection end plate.
HIGH LEVEL
INPUT
Speaker Wires
(spliced)
LR
–
L
+
–
R
+
+ WHITE
– WHITE/BLACK
GRAY/BLACK –
GRAY +
Power Amplifier Reference 7540a/7541a
3

The 7540a/7541a can be set up for stereo 4-channel,
3-channel or bridged 2-channel operation, as
shown in Figures 7 through 9.
NOTE: For simplicity, Figures 7 through 9 do not
show power, remote and input connections.
NOTE: Minimum speaker impedance for
stereo operation is 2 ohms. Minimum speaker
impedance for bridged operation is 4 ohms.
NOTE: “Bass Boost” only affects rear channels.
APPLICATIONS – 7540a/7541a
Figure 7. 7540a/7541a amplifier in 4-channel (stereo) operation to drive front and rear full-range speakers.
Figure 8. 7540a/7541a is set up for 3-channel operation to drive a set of full-range speakers and a subwoofer.
Figure 9. 7540a/7541a used in bridged 2-channel mode to drive a set of components or subwoofers.
Power Amplifier Reference 7540a/7541a
4

Initially set the crossover-frequency control
midway. While listening to music, adjust the
crossover for the least perceived distortion from
the speakers, allowing them to reproduce as
much bass as possible.
Systems using a separate subwoofer set the
crossover mode to HP (high pass) for your
full-range speakers. Adjust the crossover
frequency to limit bass, and provide increased
system volume with less distortion.
For subwoofers, choose the highest frequency
that removes vocal information from the sound
of the subwoofer.
If using the 7540a/7541a to drive a subwoofer(s),
set the crossover mode to LP (low pass).
SETTING THE CROSSOVER(S)
Determine your system plans and set the
crossover-mode switch accordingly. If your
system design does not include a subwoofer,
set the crossover mode to FLAT and skip to
“Setting Input Sensitivity.”
MODE SWITCH
Flat: Allows a full-range signal through to the
speakers; can be used with larger full-range
speakers such as 6" x 9"s.
HP: Allows a high-pass signal through to
the speakers; should be used with most
loudspeakers (can protect your full-range
speakers from being overdriven with low
frequencies, one cause of speaker damage).
LP: Allows bass to pass through to the speakers;
should be selected when powering subwoofers.
Figure 13. Control end panel.
SETTING INPUT SENSITIVITY
1. Initially turn the INPUT LEVEL control(s) to
minimum (counterclockwise).
2. Reconnect the (–) negative lead to the vehi-
cle’s battery. Apply power to the audio system
and play a dynamic music track.
3. On the source unit, increase the volume
control to 3/4 volume. Slowly increase the
INPUT LEVEL control(s) toward three o’clock
until you hear slight distortion in the music.
Then reduce the INPUT LEVEL slightly until
distortion is no longer heard.
NOTE: After the source unit is on, blue LEDs (on
the top panel) will light, indicating the amplifier
is on. If not, check the wiring, especially the
remote connection from the source unit. Also
refer to “Troubleshooting” on the page 6.
INSTALLATION AND SETUP
REMOTE LEVEL CONTROL (OPTIONAL)
All three Reference subwoofer amplifiers
have inputs for an optional
remote level control (100rc).This will allow the
subwoofer level to be adjusted from the listening
position. Connect the optional remote level
control using the RJ-11 jack on the side of the
amplifier. Install the control module in the front
of the vehicle within easy reach of the driver.
Both the underside of the dash and the center
console are suitable locations. Refer to the
mounting instructions accompanying the 100rc.
SETTING THE BASS BOOST
The 7540a/7541a are all equipped
with a bass-boost control.This allows you to
enhance the bass output of your system at
50Hz up to 12dB.
NOTE: Only rear channels of the 7540a/7541a are
affected by the bass boost control.
AUX OUTPUT
Reference amplifiers are equipped
with full-range outputs that can be used to
connect additional amplifiers.
NOTE: When using the low- or high-level inputs,
the AUX outputs can be used to pass a full-range
line-level signal to another amplifier.
Power Amplifier Reference 7540a/7541a
5

7
STATUS LEDs
Clip: Indicates the amplifier is being overdriven,
and your speakers may be in danger.This
should blink only on musical peaks, and not
be on constantly.
Power: Indicates the amplifier is on.
Protection: Refer to “Troubleshooting” for specific
indications.
Figure 15. LED status.
• PROBLEM:
No audio (POWER LED is off).
CAUSE and SOLUTION:
No voltage at BATT+ and/or REM terminals, or
bad or no ground connection. Check voltages
at amplifier terminals with VOM.
• PROBLEM:
No audio (PROTECT LED flashes every
4 seconds).
CAUSE and SOLUTION:
DC voltage on amplifier output. Amplifier may
need service; see enclosed warranty card for
service information.
• PROBLEM:
No audio (PROTECT LED is on).
CAUSE and SOLUTION:
Amplifier is overheated. Make sure amplifier
cooling is not blocked at mounting location;
verify that speaker-system impedance is within
specified limits.
• PROBLEM:
No audio (PROTECT and POWER LEDs flash).
CAUSE and SOLUTION:
Voltage less than 9V on BATT+ connection.
Check vehicle charging system.
• PROBLEM:
No audio (PROTECT LED is on).
CAUSE and SOLUTION:
Voltage greater than 16V or less than 8.5V on
BATT+ connection. Check vehicle charging
system.
• PROBLEM:
Distorted audio.
CAUSE and SOLUTION:
Input sensitivity is not set properly, or amplifier
or source unit is defective. Check INPUT LEVEL
setting, or check speaker wires for shorts or
grounds.
• PROBLEM:
Distorted audio (PROTECT LED flashes).
CAUSE and SOLUTION:
Short circuit in speaker or wire. Remove
speaker leads one at a time to locate shorted
speaker or wire, then repair.
• PROBLEM:
Music lacks “punch.”
CAUSE and SOLUTION:
Speakers are not connected properly. Check
speaker connections for proper polarity.
TROUBLESHOOTING
Power Amplifier Reference 7540a/7541a
6

Reference 7540a/7541a
7

71 2 3 4 5 6 8
A
B
C
D
E
Reference 7540a/7541a
8

Power Amplifier Reference 7540a/7541a
9

7540a/7541a BLOCK DIAGRAM
Power Amplifier Reference 7540a/7541a
10

J61
15m/m
J26
7.5m/m
J14
17.5m/m
R45
47
J115 10m/m
J66
22m/m
C800
10/16V
C52
4700/50V"HC"
J150
7.5m/m
HI301
LAD1140-04PBK
HI101
LAD1140-04PBK
R307
1K
SW102
JSS2219
CON301-1
TM2501-DG-14P
BJ07
55m/m
SW302
JSS2219
J151
7.5m/m
R433
22
R236 47
C251
100P
R233
22
R24322
R242
5.6K
J129
7.5m/m
R246
47
R235
1K
R2451K
R232
5.6K
R244
22
R234 22
R250
120
Q443
C3198GR
Q44
FQP50N06
Q431
C3198GR
Q442
A1266GR
Q233
A1266GR
R91 22K
Q232
C3198GR
Q231
C3198GR
C232
100P
C242
100P
R252
10K
D251
1SS133
R237
3.9K
C221
68P
Q241
A1266GR
C320
2.2/50V
J12019m/m
R247
2.7K
R271
13.7KF
C240
473(M)
Q242
A1266GR
R272
820F
R443 22
C191
220/16V
R160 0.1/3W
D291
1N4744
J179
19m/m
R03
10/0.5W
J172 7.5m/m
J11012.5m/m
R370
0.1/3W
D191
1N4744
J174 22m/m
Q243
C3198GR
J55 6m/m
1STPOWER
LWL0640-03P
J13422m/m
C291
220/16V
Q234
C1027Y
J8112.5m/m
C371
100/16V
R442
5.6K
R350
120
Q244
A1023Y
J4412.5m/m
J79
7.5m/m
Q251
C3200GR
Q341
A1266GR
C332
100P
C342
100P
R4511.5K
C451
100P
R15 10
J178 22m/m
D351
1SS133
R352 10K
J141
6m/m
J143
6m/m
C301
102P
R3373.9K
J152
6m/m
J153
6m/m
C321
68P
Q342
A1266GR
J155
6m/m
C141
2.2/50V
C401
102P
J148
10m/m
J166 20m/m
R446
47
J4912.5m/m
J149
10m/m
R181
56K
J222
7.5m/m
R431 1K
R4351K
R3472.7K
R170
0.1/3W
R131
1K
R141
1K
C340
473(M)
R441
1K
Q331
C3198GR
R334
22
Q343
C3198GR
R344
22
R332
5.6K
J177 22m/m
R371
13.7KF
Q334
C1027Y
C261
104(M)
R372
820F
J112 12.5m/m
C461
104(M)
R345 1K
J75
15m/m
C471
100/16V
R465
1K
C131
2.2/50V
C192
330/16V
J07
17.5m/m
L01
CL-510
C62
4700/50V"HC"
J13812.5m/m
J73
15m/m
R321
22KF
R407
1K
R341 1K
J22
10m/m
Q344
A1023Y
Q335
TIP35C
J136
22m/m
Q345
TIP36C
C441
2.2/50V
Q351
C3200GR
J92
12.5m/m
J93
12.5m/m
C431
2.2/50V
C331
2.2/50V
J171 22m/m
J8212.5m/m
Q445
TIP36C
J99
17.5m/m
C341
2.2/50V
C57
4.7/50V
R421 22KF
R56
47
Q435
TIP35C
R3351K
R365
1K
J156
6m/m
R331 1K
R445 1K
D52 FR154
WIRE
W1
120m/m
J97 20m/m
C404
10P
Q332
C3198GR
Q333
A1266GR
C405
22P
R472
820F
C406
22P
J140
6m/m
J76
15m/m
C161
104(M)
R402
47KF
J113 12.5m/m
C171
100/16V
C120
2.2/50V
D53 FR154
D51 FR154
R403
47KF
R121
22KF
J117
15m/m
J154
7.5m/m
J118
20m/m
J142
6m/m
J51
15m/m
J83
15m/m
J137
22m/m
R90 47K
Q434
C1027Y
C220
2.2/50V
R360
0.1/3W
J1117.5m/m
L02
CL-510 J65
10m/m
R406
47KF
J10217.5m/m
J310
20m/m
J1017.5m/m
J64
10m/m
R405
47KF
J130 6m/m
C402
22/16V"SRE"
C60
104P
Q145
TIP36C
Q135
TIP35C
J176 22m/m
R172
820F
C11
100/16V
R171
13.7KF
R346
47
J7720m/m
R471
13.7KF
C403
22/16V"SRE"
J139
6m/m
C140
473(M)
J98 20m/m
R147
2.7K
R137
3.9K
R432
5.6K
J122
22m/m
Q441
A1266GR
R444
22
D42
YG225D2
J91
12.5m/m
J16811m/m
R31
1K
C14
47/16V
J133
22m/m
R41
220/0.5W
R351
1.5K
R02
4.7K
C15
10/25V
D41
YG225D2
R04 56K
J10017.5m/m
Q340
C3200GR
C181
100/16V
J78
15m/m
C33 473P
R61 10K
R05
8.2K
J158 22m/m
R342
5.6K
R401
22KF
R16 820
C12 100/16V
C13
100/16V
R53
47
R12
3.9K
R343 22
R34 15K
J48
12.5m/m
Q440
C3200GR
J16917.5m/m
R434
22
Q240
C3200GR
R33 33K
Q140
C3200GR
C21102(M)
R14
10K
J252
6m/m
C420
2.2/50V
C22 104P
R01
4.7K
Q151
C3200GR
R11
4.7K
R333
22
C121
68P
Q53
FQP50N06
R32
22K
R336
47
C61
470/50V
J84
17.5m/m
J71
12.5m/m
C63
473P
J8817.5m/m
2NDPOWER
LWL0640-03P
C304
10P
J1217.5m/m
Q54
FQP50N06
C53473P
J35
10m/m
U01
TL494CN
Q43
FQP50N06
J80
7.5m/m
R270 0.1/3W
R21 24K
R460
0.1/3W
J1717.5m/m
TH01
FTD5-350
R13 10K
R22 24K
R381
56K
R42
1K
J19
17.5m/m
R43
47
J2017.5m/m
D54 FR154
Q22
A1268GR
Q02
C3198GR
Q11
A1266GR
R51
220/0.5W
R152
10K
D03
1SS133
C351
100P
Q12A1266GR
R447
2.7K
Q21
C3198BL
C440
473(M)
Q01
A1023Y
R4373.9K
J12611m/m
R150
120
D151
1SS133
Q33
A1266GR
J63
17.5m/m
D04
1SS133
C361
104(M)
R452
10K
C142
100P
R281 56K
C132
100P
Q23
A1266GR
Q433
A1266GR
J104
20m/m
R291
150/2W
C16
47/25V
J116
6m/m
Q432
C3198GR
R191
150/2W
Q281
C3198GR
J90
12.5m/m
Q181
C3198GR
C05
2200/25V"WL"
Q144
A1023Y
R62
4.7KF
C421
68P J147
10m/m
R161
4.7/0.5W
R450
120
Q134
C1027Y
C241
2.2/50V
J16711m/m
D451
1SS133
R134
22
C442
100P
C432
100P
Q451
C3200GR
R30
100/2W
Q143
C3198GR
Q142
A1266GR
R144
22
R132
5.6K
R145
1K
R135
1K
C08
222(M)
J60
15m/m
R146
47
R151
1.5K
J121
22m/m
R142
5.6K
R143 22
R133
22
R13647
J67
22m/m
J175 22m/m
R231
1K
Q141
A1266GR
C151
100P
R420
5.6KF
R220
5.6KF
R241
1K
R221
22KF
C231
2.2/50V
J135
22m/m
C306
22P
D01 1N5404
Q131
C3198GR
Q132
C3198GR
Q444
A1023Y
Q245
TIP36C
Q235
TIP35C
Q133
A1266GR
R251
1.5K
C305
22P
TER02
WT-9519
R305
47KF
FH01
WF-9604
J74
15m/m
R303
47KF
C302
22/16V"SRE"
C303
22/16V"SRE"
U301
NJM2068LD
J39
10m/m
R302
47KF
R306
47KF
R301
22KF
U110
NJM2068LD
R469
200K
J170
6m/m
J123
22m/m
C67
4.7/50V
J323
7.5m/m
J173 22m/m
R260 0.1/3W
J125 22m/m
J0617.5m/m
R60
10.5KF
J86
17.5m/m
R35
15K
J251
13m/m
TM0006-01
R436 47
R165
1K
R269
200K
C101
102P
C201
102P
R265
1K
R169
200K
R369 200K
C271
100/16V
C03 104P
C04
2200/25V"WL"
R207
1K
R107
1K
R481
56K
C204
10P
C205
22P
C206
22P
R202
47KF
R206
47KF
J87
17.5m/m
J103
20m/m
R203
47KF
J89
12.5m/m
R205
47KF
C203
22/16V"SRE"
C202
22/16V"SRE"
J94
12.5m/m
J321
15m/m
R201
22KF
C31
105(M)TL
C104
10P
J320 20m/m
BJ06
35m/m
R162
680/2W
55m/m
105(M)TL
C01
105(M)"TL"
C106
22P
J72
12.5m/m
J54
6m/m
J1817.5m/m
J53 6m/m
C105
22P
R461
4.7/0.5W
R105
47KF
R52
1K
RCA301
DJB-562D
3RD
C400
104P
WIRE
W2
60m/m
C200
104P
D02
IN4004
R362
680/2W
R462
680/2W
R262
680/2W
R106
47KF
J4712.5m/m
C102
22/16V"SRE"
RCA101
DJB-554A
J10817.5m/m
J165 7.5m/m
J52 6m/m
R361
4.7/0.5W
R129
100K
C128
4.7/50V"SRE"
C103
22/16V"SRE"
C228
4.7/50V"SRE"
U101
NJM2068LD
R102
47KF
R103
47KF
J8517.5m/m
R101
22KF
R55
47
R46
47
Q56
FQP50N06
D269
1SS133
Q90C3198GR
R92 1K
R25 68K
SCREW
R54
47
J0817.5m/m
J09
17.5m/m
Q55
FQP50N06
R470
0.1/3W
J1617.5m/m
J15
17.5m/m
J13
17.5m/m
Q45
FQP50N06
R44
47
Q46
FQP50N06
55m/m
J05
17.5m/m
L03
CL-310
J119
22m/m
J124
22m/m
J62
17.5m/m
J159 15m/m
J157 15m/m
J160 17.5m/m
J164 22m/m
C323
22/16V"SRE"
C324
22/16V"SRE"
C423
22/16V"SRE"
C424
22/16V"SRE"
C224
22/16V"SRE"
C223
22/16V"SRE"
C124
22/16V"SRE"
C123
22/16V"SRE"
R123
270K
R124
270K
R223
270K
R224
270K
R222
10K
R122
10K
U111
NJM2068LD
R166
1K
R466
1K
R266
1K
R366
1K
R125
10KF
R126
10KF
U310
NJM2068LD
R127
1K
R128
1K
C126
22P
R229
100K
C226
22P
R227
1K
R228
1K
R226
10KF
R225
10KF
R322
10K
R422
10K
R424
270K
R423
270K
R324
270K
R323
270K
J107
17.5m/m
3RD.
BJ08
20m/m
BJ09
35m/m
J322
7.5m/m
J331
7.5m/m
J27
7.5m/m
C51
470/50V
J10912.5m/m
J330
20m/m
J163 22m/m
J162 22m/m
J161 22m/m
J131
17.5m/m
J128
22m/m
J12711m/m
J101
17.5m/m
D369
1SS133
J144
7.5m/m
J205
11m/m
J250
17.5m/m
J202
20m/m
J201
7.5m/m
C410 104P
C210
104P
J203
6m/m
J132
10m/m
J4612.5m/m
J219
6m/m
J218
6m/m
J209
10m/m
J213
15m/m
R261
4.7/0.5W
J207
20m/m
J206
20m/m
J228
12.5m/m
J229
6m/m
J215
10m/m
J223
10m/m
J224
10m/m
C06
2200/25V"WL"
J227
10m/m
CLIP
LWL0640-02P
R320
5.6KF
J200
6m/m
J226
10m/m
D469
1SS133
J208
10m/m
J225
6m/m
J230
6m/m
R120
5.6KF
J231
6m/m
D169
1SS133
J214
6m/m
J30
7.5m/m
J31
7.5m/m
J32
7.5m/m
BJ04
35m/m
J34
10m/m
J38
10m/m J37
10m/m J36 10m/m
J42
7.5m/m
J43
7.5m/m
J212
6m/m
J211
6m/m
R63430K
J204
6m/m
J217
6m/m
J216
6m/m
CON101-1
TM2501-DG-14P
J210
10m/m
C32
473P
D11
1SS133
J59
25m/m
J11120m/m
J25
7.5m/m
J4512.5m/m
J28
7.5m/m
C292
330/16V
J114 10m/m
SCREW
BJ03
55m/m
J5012.5m/m
J40 7.5m/m J41 7.5m/m
J58
10m/m
J57
10m/m
J56
10m/m
J33
6m/m
J29
7.5m/m
J70
23m/m
J21
10m/m
J23
10m/m
J24
10m/m
J300
6m/m
T01
44PHI
SCREW
YELLOW
RED
BK
BK
BK
7540a
FR-IN
FL-IN
+15V
GNDS
FL-OUT
FR-OUT
RR-OUT
RL-OUT
GNDS
-15V -15V
+15V
RR-IN
RL-IN
R-R-
R+R+ L+L+
L-L-
MONO MONOSTEREO STEREO
LR LL
RR
R/CH
L/CH
4T:11T:8T:8T
(0.7x15):(0.7x4):(0.7x1):(0.7x1)
Reference 7540a/7541a
11

J75
J150
J07
R53
J148
J174
C52
J151
HI301
HI101
R433
SW102
CON301-1
BJ07
SW302
J129
R236
R233
C232
R243
R242
R246
J172
R235
R245
R232
R244
R234
R250
R91
Q431
Q44
Q442
Q233
Q232
R252
Q231
Q241
C242
C221
R237
D351
R247
C332
Q242
C120
J120
R271
R272
C340
Q243
R443
R442
C191
R160
D291
J179
R41
J79
J82
R370
D191
J134
Q234
J141
1STPOWER
J178
C291
Q244
C371
R350
R451 Q251
J222
Q341
Q342
C342
C451
R15
C301
R352
J177
D03
R337
J143
J152
C321
R446
J153
J155
C401
Q331
J156
C131
C404
J149
J97
R431
J112
R161
J154
R435
R347
R131
R170
R141
R441
C341
R334
Q343
R344
Q334 R332
R371
J136
R372
Q344
C161
R345
J138
C32
R465
J73
C471
R321
C441
C192
J99
L01
C62
J92
J76
R407
R341
R421
J65
Q351
Q335
J171
Q345
C431
Q332
J93
C320
J63
J132
J113
Q445
J11
C57
J160
R335
J81
Q435
R365
R331
J140
R445
R472
D52
W1
J118
C405
Q333
Q434
C406
R402
C60
J142
J117
C140
R403
J91
C171
C141
D53
D51
R121
R90
J80
J310
J130
C261
J78
J176
R406
Q441
C402
R360
J102
L02
J64
R405
J10
J77
J100
R172
J139
C403
C08
Q145Q135
J122
R171
C11
R346
R471
J98
R147
C14
J252
C21
J104
R137
R432
R444
J133
Q340
R31
D42
J168
R351
J158
R51
R04
R35
C420
D41
R61
J169
Q440
C181
J60
C22
R05
R342
J121
R401
R16
R12
C12
C13
R381
R343
R34
R434
J114
Q240
J84
R33
Q140
R14
Q151
C440
R01
J116
C16
C121
R11
Q22
R333
R32
C63
Q53
R336
R21
C61
J88
J90
C304
J12
2NDPOWER
C53
J17
Q54
C351
J147
U01
Q43
R270
R13
R460
J19
TH01
R22
R152
R42
R43
J20
R251
D54
Q02
Q11
Q12
J131
R447
D151
C142
Q21
R437
Q01
C461
Q33
R150
J126
R452
D04
Q23
J06
D451
J71
R62
C132
R52
C421
Q433
Q432
J103
R291
C241
J170
Q281
R191
Q181
J89
Q144
C05
Q134
R450
C442
C240
R134
Q451
C231
J167
D269
R144
C432
C151
Q143
R30
Q142
Q141
R132
R145
R135
R146
C31
J74
R151
R142
J67
R143
R133
R136
R231
J175
J135
R420
Q131
C306
R220
R241
R221
R305
C302
J123
C305
D01
Q132
Q444
Q133
Q245
Q235
Q90
J166
C201
TER02
R303
J321
R302
C303
C67
U110
J128
R306
R301
R469
U101
R60
J54
J173
C203
J165
J125
R260
J137
J86
R436
J87
R461
J251
TER01
R165 R265
R269
R129
C34
R169
R369
R207
C271
C204
C04
R107 R202
R481
C205
C331
C104 R206
R203
J18
J320
R205
J94
R201
C202 C102
J72
J159
R105
C01
C106
J330
R162
C33
R281
C206
J53
J52
C400
R361
R106
R55
RCA301
3RD
C200
W2
C126
D02
R362
R462
R262
C105
C128
RCA101
J85
C03
J203
R261
R102
C103
C228
C323
U111
R103
R101
J08
R92
R46
R54
Q56
D369
C800
R25
R123
R44
J09
J16
Q55
R470
J15
J13
J05
Q45
J61
Q46
J62
L03
J124
J164
C251
J157
J213
J163
C324 C423
C424
C224
C223 C124
C123
C101
R124 R223 R224
R222R122
R166
U310
R466
R266
R366
R125
R126
R127
R128
R229
C226
R227
C410
R228
R226
R225
R322 R422
R424 R423 R324 R323
R320
J119
3RD.
C15
R307
J144
C51
J202
J162
J161
J83
J101
U301
J127
J250
D469
J201
J205
R56
J207
C210
R03
J219
J209
J228
J218
J229
J215
J66
C220
J206
J111
J200
J223
J224
J227
C06
J226
CLIP
R120
J225
J208
D169
J230
J231
R63
J214
D11
J212
J51
J210
J211
J204
J217
J216
CON101-1
J115
R181
C361
J59
J55
C292
J14
D251
R02
J70
R45
Q443
T01
Reference 7540a/7541a
12

Reference 7540a/7541a
13

Reference 7540a/7541a
14

TRS-00-00087 TRANSISTOR SMALL SIGNAL PNP KTA1023Y Q01,144,244,344,444 5
TRS-00-00088 TRANSISTOR SMALL SIGNAL NPN KTC1027Y Q134,234,334,434 4
TRS-00-00091 TRANSISTOR SMALL SIGNAL PNP KTA1268GR Q22 1
TRS-00-00111 TRANSISTOR SMALL SIGNAL NPN KTC3200GR Q151,251,351,451 4
TRS-00-00110 TRANSISTOR SMALL SIGNAL NPN KTC3198GR Q02,90,131,132,143,181,231,232,243,281 16
Q331,332,343,431,432,443
TRS-00-00090 TRANSISTOR SMALL SIGNAL PNP KTA1266GR Q11,12,23,33,133,141,142,233,241,242 16
Q333,341,342,433,441,442
TRS-00-00109 TRANSISTOR SMALL SIGNAL NPN KTC3198BL Q21 1
DIO-00-00108 DIODE FAST RECOVERY FR154 D51,52,53,54 4
DIO-00-00003 DIODE RECTIFIER IN4004 D02 1
DIO-00-00006 DIODE SWITCHING SIGNAL 1SS133 D03,04,11,151,169,251,269,351,369,451 11
D469
RES-00-00586 RESISTOR METAL FILM 1/5WF 820 OHM R172,272,372,472 4
RES-00-00523 RESISTOR METAL FILM 1/5WF 4.7K OHM R62 1
RES-00-00545 RESISTOR METAL FILM 1/5WF 5.6K OHM R120,220,320,420 4
RES-00-00402 RESISTOR METAL FILM 1/5WF 10K OHM R125,126,225,226 4
RES-00-00399 RESISTOR METAL FILM 1/5WF 10.5K OHM R60 1
RES-00-00417 RESISTOR METAL FILM 1/5WF 13.7K OHM R171,271,371,471 4
RES-00-00467 RESISTOR METAL FILM 1/5WF 22K OHM R101,121,201,221,301,321,401,421 8
RES-00-00537 RESISTOR METAL FILM 1/5WF 47K OHM R102,103,105,106,202,203,205,206,302,303 16
R305,306,402,403,405,406
RES-00-00610 RESISTOR CARBON FILM 1/5WJ 10 OHM R15 1
RES-00-00660 RESISTOR CARBON FILM 1/5WJ 22 OHM R133,134,143,144,233,234,243,244,333,334 16
R343,344,433,434,443,444
RES-00-00716 RESISTOR CARBON FILM 1/5WJ 47 OHM R43,44,45,46,53,54,55,56,136,146 16
R236,246,336,346,436,446
RES-00-00615 RESISTOR CARBON FILM 1/5WJ 120 OHM R150,250,350,450 4
RES-00-00756 RESISTOR CARBON FILM 1/5WJ 820 OHM R16 1
RES-00-00633 RESISTOR CARBON FILM 1/5WJ 1K OHM R31,42,52,92,107,127,128,131,135,141 36
R145,165,166,207,227,228,231,235,241,245
R265,266,307,331,335,341,345,365,366,407
R431,435,441,445,465,466
RES-00-00598 RESISTOR CARBON FILM 1/5WJ 1.5K OHM R151,251,351,451 4
RES-00-00644 RESISTOR CARBON FILM 1/5WJ 2.7K OHM R147,247,347,447 4
RES-00-00676 RESISTOR CARBON FILM 1/5WJ 3.9K OHM R12,137,237,337,437 5
RES-00-00702 RESISTOR CARBON FILM 1/5WJ 4.7K OHM R01,02,11 3
RES-00-00720 RESISTOR CARBON FILM 1/5WJ 5.6K OHM R132,142,232,242,332,342,432,442 8
RES-00-00751 RESISTOR CARBON FILM 1/5WJ 8.2K OHM R05 1
RES-00-00608 RESISTOR CARBON FILM 1/5WJ 10K OHM R13,14,61,122,152,222,252,322,352,422 11
R452
RES-00-00623 RESISTOR CARBON FILM 1/5WJ 15K OHM R34,35 2
RES-00-00658 RESISTOR CARBON FILM 1/5WJ 22K OHM R32,91 2
RES-00-00663 RESISTOR CARBON FILM 1/5WJ 24K OHM R21,22 2
RES-00-00687 RESISTOR CARBON FILM 1/5WJ 33K OHM R33 1
RES-00-00714 RESISTOR CARBON FILM 1/5WJ 47K OHM R90 1
RES-00-00730 RESISTOR CARBON FILM 1/5WJ 56K OHM R04,181,281,381,481 5
RES-00-00742 RESISTOR CARBON FILM 1/5WJ 68K OHM R25 1
RES-00-00604 RESISTOR CARBON FILM 1/5WJ 100K OHM R129,229 2
RES-00-00647 RESISTOR CARBON FILM 1/5WJ 200K OHM R169,269,369,469 4
RES-00-00664 RESISTOR CARBON FILM 1/5WJ 270K OHM R123,124,223,224,323,324,423,424 8
RES-00-00706 RESISTOR CARBON FILM 1/5WJ 430K OHM R63 1
RES-00-00053 RESISTOR METAL FILM 1/2WJ 4.7 OHM R161,261,361,461 4
RES-00-00018 RESISTOR METAL FILM 1/2WJ 10 OHM R03 1
RES-00-00038 RESISTOR METAL FILM 1/2WJ 220 OHM R41,51 2
ELC-00-00223 CAPACITOR ELECTROLYTIC "SMS" 2.2/50V C120,131,141,220,231,241,320,331,341,420 12
C431,441
ELC-00-00229 CAPACITOR ELECTROLYTIC "SMS" 4.7/50V C57,67 2
ELC-00-00195 CAPACITOR ELECTROLYTIC "SMS" 10/16V C800 1
ELC-00-00203 CAPACITOR ELECTROLYTIC "SMS" 10/25V C15 1
ELC-00-00198 CAPACITOR ELECTROLYTIC "SMS" 47/16V C14 1
ELC-00-00205 CAPACITOR ELECTROLYTIC "SMS" 47/25V C16 1
Electrical Parts List
Reference 7540a/7541a
15

ELC-00-00199 CAPACITOR ELECTROLYTIC "SMS" 100/16V C11,12,13,171,181,271,371,471 8
ELC-00-00200 CAPACITOR ELECTROLYTIC "SMS" 220/16V C191,291 2
ELC-00-00201 CAPACITOR ELECTROLYTIC "SMS" 330/16V C192,292 2
ELC-00-00250 CAPACITOR ELECTROLYTIC "SRE" 4.7/50V C128,228 2
ELC-00-00641 CAPACITOR ELECTROLYTIC "SRE" 22/16V C102,103,123,124,202,203,223,224,302,303 16
C323,324,402,403,423,424
MYC-00-00020 CAPACITOR MYLAR 5% 100V 102(M) J C21 1
MYC-00-00031 CAPACITOR MYLAR 5% 100V 222(M) J C08 1
MYC-00-00038 CAPACITOR MYLAR 5% 100V 473(M) J C140,240,340,440 4
MYC-00-00094 CAPACITOR MYLAR 5% 100V 104(M) J C161,261,361,461 4
MYC-00-00085 CAPACITOR MYLAR 5% 63V "TL" 105(M) J C01,31,34 3
CEC-00-00077 CAPACITOR CERAMIC DISK 50V "NPO" 10P F C104,204,304,404 4
CEC-00-00090 CAPACITOR CERAMIC DISK 50V "NPO" 22P F C105,106,126,205,206,226,305,306,405,406 10
CEC-00-00108 CAPACITOR CERAMIC DISK 50V "NPO" 68P F C121,221,321,421 4
CEC-00-00073 CAPACITOR CERAMIC DISK 50V "NPO" 100P F C132,142,151,232,242,251,332,342,351,432 12
C442,451
CEC-00-00074 CAPACITOR CERAMIC DISK 50V 102P F C101,201,301,401 4
CEC-00-00102 CAPACITOR CERAMIC DISK 50V 473P F C32,33,53,63 4
CEC-00-00076 CAPACITOR CERAMIC DISK 50V 104P F C03,22,60,200,210,400,410 7
JUP-00-00043 JUMPER 0OHM JUMPER 6m/m J33,52,53,54,55,116,130,139,140,141 33
J142,143,152,153,155,156,170,200,203,204
J211,212,214,216,217,218,219,225,229,230
J231,252,300
JUP-00-00044 JUMPER 0OHM JUMPER 7.5m/m J25,26,27,28,29,30,31,32,40,41 26
J42,43,79,80,129,144,150,151,154,165
J172,201,222,322,323,331
JUP-00-00045 JUMPER 0OHM JUMPER 10m/m J21,22,23,24,34,35,36,37,38,39 29
J56,57,58,64,65,114,115,132,147,148
J149,208,209,210,215,223,224,226,227
JUP-00-00052 JUMPER 0OHM JUMPER 11m/m J126,127,167,168,205 5
JUP-00-00046 JUMPER 0OHM JUMPER 12.5m/m J44,45,46,47,48,49,50,71,72,81 23
J82,89,90,91,92,93,94,109,110,112
J113,138,228
JUP-00-00059 JUMPER 0OHM JUMPER 13m/m J251 1
JUP-00-00047 JUMPER 0OHM JUMPER 15m/m J51,60,61,73,74,75,76,78,83,117 14
J157,159,213,321
JUP-00-00048 JUMPER 0OHM JUMPER 17.5m/m J05,06,07,08,09,10,11,12,13,14 33
J15,16,17,18,19,20,62,63,84,85
J86,87,88,99,100,101,102,107,108,131
J160,169,250
JUP-00-00074 JUMPER 0OHM JUMPER 19m/m J120,179 2
JUP-00-00049 JUMPER 0OHM JUMPER 20m/m J77,97,98,103,104,111,118,166,202,206 14
J207,310,320,330
JUP-00-00075 JUMPER 0OHM JUMPER 22m/m J66,67,119,121,122,123,124,125,128,133 26
J134,135,136,137,158,161,162,163,164,171
J173,174,175,176,177,178
JUP-00-00076 JUMPER 0OHM JUMPER 23m/m J70 1
JUP-00-00042 JUMPER 0OHM JUMPER 25m/m J59 1
ICO-00-00022 I.C P.W.M TL494CN U01 1
ICO-00-00112 I.C DUAL OP AMP "SIP-08P" NJM2068LD U101,110,111,301,310 5
FET-00-00023 F.E.T N-CH MOSFET FQP50N06 Q43,44,45,46,53,54,55,56 8
TRS-00-00188 TRANSISTOR AUDIO POWER NPN TIP35C Q135,235,335,435 4
TRS-00-00207 TRANSISTOR AUDIO POWER PNP TIP36C Q145,245,345,445 4
TRS-00-00111 TRANSISTOR SMALL SIGNAL NPN KTC3200GR Q140,240,340,440 4
DIO-00-00152 DIODE FAST RECOVERY YG225D2 D41,42 2
DIO-00-00048 DIODE RECTIFIER 1N5404 D01 1
DIO-00-00206 DIODE ZENER 1W 15V 1N4744A D191,291 2
RES-00-01046 RESISTOR MOR/S 2WJ 100 OHM (3.8x11m/m) R30 1
RES-00-01264 RESISTOR MOR/S 2WJ 150 OHM (3.8x11m/m) R291 1
RES-00-01265 RESISTOR MOR/S 2WJ 150 OHM (3.8x11m/m) R191 1
RES-00-01041 RESISTOR MOR/S 2WJ 680 OHM (3.8x11m/m) R162,262,362,462 4
RES-00-00895 RESISTOR WIRE WOUND 3WJ 0.1 OHM (5.5x15m/m) R160,170,260,270,360,370,460,470 8
Electrical Parts List cont'd
Reference 7540a/7541a
16

THS-00-00013 THERMISTOR NTC RESISTOR FTD5-350 TH01 1
ELC-00-00234 CAPACITOR ELECTROLYTIC "SMS" 470/50V (12.5x20m/m) C51,61 2
ELC-00-00727 CAPACITOR ELECTROLYTIC "WL" 2200/25V (16x25m/m) C04,05,06 3
ELC-00-00714 CAPACITOR ELECTROLYTIC "HC/DL" 4700/50V (25x30m/m) C52,62 2
COR-TF-00405 CORE 44PHI MAGNETICS T01 , 4(0.7x15):11(0.7x4):8(0.7x1):8(0.7x1) 1
COI-00-00093 INDUCTOR DRUM COIL CL-510 L01,02 2
COI-00-00028 INDUCTOR BAR COIL CL-310 L03 1
SWI-00-00024 SWITCH SLIDE SWITCH JSS-2219 SW102,302 2
JAC-00-00043 RCA JACK GOLD PLATED DJB-554A RCA101 1
JAC-00-00042 RCA JACK GOLD PLATED DJB-562D RCA301 1
TER-00-00030 TERMINAL GOLD PLATED TM0006-01 (3P) TER01 1
TER-00-00021 TERMINAL GOLD PLATED 8P WT-9519 TER02 1
JUP-00-00005 JUMPER METAL JUMPER 55m/m BJ01,02,03,07 4
JUP-00-00003 JUMPER METAL JUMPER 35m/m BJ04,06,09 3
JUP-00-00001 JUMPER METAL JUMPER 20m/m BJ08 1
HOD-00-00011 FUSE HOLDER WF-9604 Fh01 1
CON-00-00002 WAFER LWL0640-2P CLIP 1
CON-00-00033 WAFER LWL0640-3P 1ST POWER,2ND POWER 2
CON-00-00128 WAFER LAD1140-04PBK HI101,301 2
WIR-00-00208 WIRE ASS'Y 300m/m CHD1140-04PBK ACCESSORY 2
WIR-00-00015 WIRE AWG #22 BK 3.2PHI RING LUG 60m/m W2 1
WIR-00-00018 WIRE AWG #22 BK 3.2PHI RING LUG 120m/m W1 1
HED-00-00115 HEADER PIN SOCKET TM2501-DG-14P 14P CON101-1,301-1 2
TUB-00-00008 TEFLON TUBE 0.7PHI 10m/m TH01,Q140,240,340,440 6
FUS-AT-00006 AUTO FUSE 30A SET2+ACCESSORY2 4
ICO-00-00113 I.C DUAL OP AMP "SOP-08" NJM2068M U102,103,104,105,302,303,304,305,306,307 10
RES-08-00239 RESISTOR SMD 0805 1/10WF 9.31K OHM R257,457 2
RES-08-00022 RESISTOR SMD 0805 1/10WF 15K OHM R155,255,355,455 4
RES-08-00088 RESISTOR SMD 0805 1/10WF 47K OHM R256,456 2
RES-08-00117 RESISTOR SMD 0805 1/10WF 91K OHM R156,356 2
RES-08-00225 RESISTOR SMD 0805 1/10WJ 820 OHM R108,208,308,408 4
RES-08-00148 RESISTOR SMD 0805 1/10WJ 1K OHM R391,392,491,492 4
RES-08-00201 RESISTOR SMD 0805 1/10WJ 5.6K OHM R113,115,213,215,313,315,413,415 8
RES-08-00210 RESISTOR SMD 0805 1/10WJ 6.8K OHM R396,496 2
RES-08-00132 RESISTOR SMD 0805 1/10WJ 10K OHM R110,111,112,114,210,211,212,214,310,311 16
R312,314,410,411,412,414
RES-08-00187 RESISTOR SMD 0805 1/10WJ 39K OHM R393,493 2
RES-08-00141 RESISTOR SMD 0805 1/10WJ 150K OHM R397,497 2
CEC-08-00023 CAPACITOR SMD 0805 22pF C156,356 2
CEC-08-00037 CAPACITOR SMD 0805 39pF C256,456 2
CEC-08-00042 CAPACITOR SMD 0805 47pF C111,211,311,393,411,493 6
CEC-08-00040 CAPACITOR SMD 0805 473pF C195,196,295,296,395,396,495,496 8
MYC-00-00157 CAPACITOR MYLAR 5% 63V "TL" 823J C113,115,213,215,313,315,413,415 8
MYC-00-00083 CAPACITOR MYLAR 5% 63V "TL" 104J C391,392,491,492 4
ELC-00-00241 CAPACITOR ELECTROLYTIC"SRE" 10/16V C125,155,225,255,325,355,425,455 8
SWI-00-00033 SWITCH SLIDE SWITCH JSS2319 SW101,301 2
VOL-00-00349 VOLUME V9M(7x5) G3(PH2R)N 15S 3B20KBx2 VR101,301,303 3
VOL-00-00351 VOLUME V9M(7x5) G(4R)(PH2R)N 15S 15C50KCx4 VR102,302 2
HED-00-00249 PIN CONNECTOR TM2008-D76G-14P 14P CON101,301 2
ICO-00-00095 I.C COMPARATOR DIP-8P KIA393P U90 1
RES-00-00437 RESISTOR METAL FILM 1/5WF 1K OHM R97 1
RES-00-00402 RESISTOR METAL FILM 1/5WF 10K OHM R95 1
RES-00-00550 RESISTOR METAL FILM 1/5WF 51K OHM R96 1
RES-00-00556 RESISTOR METAL FILM 1/5WF 56K OHM R94 1
RES-00-00573 RESISTOR METAL FILM 1/5WF 68K OHM R93 1
RES-00-00635 RESISTOR CARBON FILM 1/5WJ 1M OHM R98 1
RES-00-00029 RESISTOR METAL FILM 1/2WJ 1K OHM R192,292 2
CEC-00-00005 CAPACITOR CERAMIC TUBULAR 50V 103P C91,92,93 3
CEC-00-00006 CAPACITOR CERAMIC TUBULAR 50V 104P C90 1
DIO-00-00321 LED BLUE 3PHI MS-L330CBHSK LED1,2,3 3
CON-00-00139 WAFER LAL0640-2P CLIP 1
CON-00-00140 WAFER LAL0640-3P 1ST POWER,2ND POWER 2
WIR-AS-00220 WIRE ASS'Y BK,RED CHL0640-2P(300m/m) CLIP 1
WIR-AS-00218 WIRE ASS'Y BK,RED,GREEN CHL0640-3P(300m/m) 1ST POWER 1
WIR-AS-00219 WIRE ASS'Y BK,YELLOW,GREEN CHL0640-3P(300m/m) 2ND POWER 1
Electrical Parts List cont'd
Reference 7540a/7541a
17

Reference 7541a Electrical Parts List Addendum
The following chart below represents the only electrical parts
differences in 7540a and 7541a models:
MODEL PART NAME PART NUMBER SPEC DESIGNATOR
REF 7540a RESISTOR RES-00-00586 1/5WF 820 OHM R172,272,372,472
1 REF 7541a RESISTOR RES-00-00437 1/5WF 1K OHM R172,272,372,472
REF 7540a RESISTOR RES-00-00417 1/5WF 13.7K OHM R171,271,371,471
2 REF 7541a RESISTOR RES-00-00508 1/5WF 33K OHM R171,271,371,471
REF 7540a RESISTOR RES-08-00225 SMD 0805 1/10WJ 820 OHM R108,208,308,408
3 REF 7541a RESISTOR RES-08-00242 SMD 0805 1/10WF 240 OHM R108,208,308,408
REF 7540a POWER TERMINAL TER-00-00030 (3P) TM006-01 TER01
4 REF 7541a POWER TERMINAL TER-00-00278 (3P) DK-03B04-AG-5-UP TER01
REF 7540a SPEAKER TERMINAL TER-00-00021 (8P) WT-9519 TER02
5 REF 7541a SPEAKER TERMINAL TER-00-00274 (8P) DK-0801-AG-5-UP TER02
18
Reference 7540a/7541a

Reference 7540a/7541a
19