How To Diagnose The Amplifier Section - Pioneer VSX-1015-S Service Manual

5

7.1.2 HOW TO DIAGNOSE THE AMPLIFIER SECTION

When DC detection worked (MCACC LED flashes for a long
time) in the protection circuit of foregoing section (or there is not
the speaker output, probably only 1CH), failure (damage) of the
power amplifier section is considered.
Because this receiver cannot diagnose the amplifier section by an
electricity state by structure, please diagnose it in the following
steps.
Caution:
When release the state of flashing "MCACC" LED before repair
(see how to release "1 DC detection" on page 111.), Because
there is the case that the damage progresses when turns the power
on once again, please be careful.
• According to a symptom, perform the following
confirmation beforehand.
1. Are not Fuse and IC protector opening it?
2-a. When can turn on electricity, confirm that supply voltage of
the point that can measure is appropriate.
2-b. Furthermore, confirm that voltage ((in a no signal) DC and
the appropriate signal output) between GND and R2008-
R2014 on the SP/PS Assy (Either of the amplifier side and
the speaker terminal side is possible) (Or remove either of
CN2101-2104) on the SP/PS Assy. And limit failure CH.
If was able to limit failure CH, diagnose the CH in the following
steps.
• Use the tester basically and check that each part is
not damaged (resistance value / open / short circuit).
About parts with damaged possibility, explain FL ch to an
example in order.
1. R4231, R4232 (ACN7132: 0.047 Ω, 0.5W chip drain resistor)
IC 4202, IC4203 (SAPM01N: Nch, SAPM01P: Pch output
POWER MOS Tr.) /POWER AMP-L Assy
2. R4219 (ACN7121: 0.18 Ω .5W ×2 cement source resistor)
R4217, R4218 (RS1/16S471J: 470 Ω chip resistor for
protection circuit)
D4201, D4203 (UDZS10B: 10V Zener diode for current
limiting)
D4202, D4204 (1SS355: Small signal diodes same as above)
R4210, R4211 (RS1/16S560J: 56 Ω chip gate resistor)
R4206, R4207 (RS1/16S101J:100 Ω chip IC4101 power filter
resistor) /POWER AMP-L Assy
3. IC4201 (PA9010A: Power amplifier with output current bias
Voltage step HIC) /POWER AMP-L Assy
4. Q2231 (2SA1514K) /VH TR Assy
Q2232 (2SC3906K) /VH TR Assy
Q2233 (2SA1837D1) /VH TR Assy
Q2234 (2SC4793D1) /VH TR Assy
5
6
S POWER AMP-L ASSY
W4317
1
W4318
W4319
1
W4300
CN4402
W4301
W4302
W4303
W4304
W4305
C4301
C4303
+55V
C4305
-55V
W4325
W4326
C4401 C4402
W4308
W4309
IC4201
+55V
-55V
W4332
IC4101
+55V
R4573
-55V
15
CN4502
1 1 11 11
C2002
R2009
R2009
R2008
R2007
AA
VH TR
ASSY
SIDE A
VSX-1015-K
6
7
SIDE A
W4339
6
6
Q4402
IC4453
PBD002A
C4107
R4106
C4106
R4104
C4102 R4105
R4101 R4103
IC4302
C4117
PBD001A
D4105
PBD002A
R
CMKM-P3X
R4207
R4207
C4207
R4206
C4206
R4206
IC4303
R4204
C4202
R4201
IC4202
R
CMKM-P3X
C4217
R4202
IC4202
PBD001A
PBD002A
IC4203
R
CMKM-P3X
R4219
R4344
R4346
IC4203
IC4102
C4307
R4306
C4306
PBD001A
PBD002A
W4347
IC4103
13 1
AB
SP/PS ASSY
R2002
CN2004
W2017
WHITE
RY2001
CN2102
W2042
R2016
CN2102
W2019
1 2
CN2101
R2015
1 2
R2003
CN2101
L2003 RED
R2010
RY2005
R2012
2001
R2005
CN2002
R2004
R2011
R2011
CN2104
CN2103
RY2003
R2013
R2014
R2014
CN2006 CN2003
R
CMKM-P3X
Q2233
-C
-B Q2233
R2233
-VH
C2211
+VH
+B
+C
Q2234
Q2234
AWX8411
VH TR ASSY
7
8
A
SIDE B
Q4401
R4501
R4107
R4111
R4110
D4101
C4116
R4121
D4102
R4109
R4120
R4108 R4117
R4118
R4112
R4102
C4112 C4113
R4114
D4107
Q4102
D4106
R4115
R4116
R4145
D4204
R4146 R4144 D4108
D4208
R4244
R4246
D4203
D4205
D4204 R4232
Q4202 D4203
D4207
R4214
D4201
D4202
R4211
B
R4218
R4210
R4210 R4209 R4218
R4217
C4216
R4208
R4221
R4217
R4205
R4211
R4220
R4203 R4212
D4202
C4212 C4213
R4231
D4201
D4308
R4345
R4316
D4305
R4315
D4306
Q4302 D4304
D4307
R4314
R4307 D4303 R4318
R4317
R4321
D4301
R4320
D4302
C4316
C4302 R4305
C
R4304 R4303
R4301
C4317 R4302
SIDE A
D
E
SIDE B
Q2231
Q2231
R2231
C2231
D2231
R2232
F
R2234
C2212
Q2232 Q2232
C2232
113
8