Onkyo DTA-9.4 Service Manual
2-1 NISSHIN-CHO,NEYAGAWA-SHI,OSAKA 572-8540,JAPAN
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Service EngineeringGroup, Customer Relations Dept.
Kiyoshi Matsuoka
MODELS :
SUBJECT :
SERVICE BULLETIN
NO:03007
MANAGER
2003/07/25 2003/07/25 2003/07/25
GL
Seiji Ichikami
DESIGN
Terukazu Matumi
DTA-9.4
Improvement of the sensitivity of DC detection circuit
Symptom:
When an excessive signal is inputted into amplifier, DC detection circuit operates and results No sound.
Cause:
The DC current detection circuit is too sensitive.
Procedure for service:
In NAAF-7797 R593, chip resistor is changed from 10K to 3.3K
DAT-9.4 has seven units of NAAF-7797 and do this change for all units.
Circuit No. Before change After change Description Remarks
Part No. Description Part No.
R593 435031034R1 RN72K1J-103J 435033324R1 RN72K1J-332J
Refer to the attached file---Page 2
Application: ...All seven power amplifier modules per unit.
Marking: Mark "A" after the serial number.
Revised: By Gedion Teklewolde
History:
6
P6
SERVICE BULLETIN
2 of 2
NO:03007
POWER AMPLIFIER PC BOARD
U15
(NAAF-7797)
TEMPERATURE
OR
P704
C701
Q702
R730
R701
C705
Q717
Q717
1
Q752
C751
Q754
R755
GNDC
+5VC
ERR
FMUTE
P702
OUTRL
PHTCP
GMUTE
P701
P703
CURRENT
R735
Q711
1
C707
Q711
Q704
Q753
C753
R751
C502
17
R506
R552
R513
RL502
IIOOGG
C501
C508
C507
R501
R502
C503
C504
R504
R503
Q502
R507R508
R510
R511
D
D D
EEB
Q504
Q503
C505
C506
R512
R515
R514
RL502
R721
C614
C703
JL701A
Component side
D751 D705
D710
MODULATOR
OPERATION
OUTPUT
WARNING
INDICATOR
C618
C613
O
I
G
Q610
Q604Q603
C608
R612
C617
C616
R611
R610
C607
L505
C534
Q501
C509
R505
R509
B
R516 R517
R555
Q506
G
SSS
C530
R607
DC
C615
P601A P601C
L
6
0
1
L601
L602
P607A
C603
C601
C601
L505
C611
Q517
Q513
C522
R558R559
R518R519 R537
C529
R549
R548
P601B
P608A
C519
C520
D517
R540
D513
C521
P503
R539
R554
D503
D504
D502
D501
D510
D509
D508
D507
G
Q505
C531
E601
C604
R556
C610
C609
R609
R604
2
0
6
L
C602
R547
C602
L506
C612
P504
D518
R560
Q514
D514
Q511 Q512
C532
G
R551
R550
E
R606R605
R608
R603
C410 C411
EBB
Q605 Q606
R546
C525
C526
R544
R601
R545
R542
R543
C523
C524
R602
NCAF-7797
25137797A
L506
R521
C513
R523
C535
R525
C518
R553
Q518
R527 R526
R561
R538
BE
R557
R530
S
G
C514
R533
Q510
RL501
C517
D
R531
C409
C408
C605 C606
1
Q508
E
C515
R534
R723
R724
R722
DTA-9.4
R410
R416R417
C401
R524
R528
R405
C402
R414
R418
C412C413
R412
R413
C404 C405
C403
R406
R430
R419
R415
R411
OFFSET
C310
R409
R407
R330
R329
C315
R327
R328
O
O
IG
G
Q601
I
C510C511
C516
R520
C512
R522
Q507
R529
B
Q509
R532
RL501
C316
Q602
C309
R595R596
R321 R310
C308
R311
R340
C583
C584
Q581
1
R586
C581
R584
R582
R585
C580
R583
R580
R581
RL701
RL701
EB
C702
Q708
R404R403
R401 R402
R315 R326
R312
R323
R341
R322
C303R318
R309
1
Q303
R320
R316
D581
D580
R594
R589
R591
R593
C582
L507
L507
E501
C307
R325
R314
C306
R308
C586
C587
P501
P502
BLACK
P302
R343
P302
R302
R306
R303
R304
C302
C305
C304
R319
C313
R334
C312
P303
WHITE
S301
R317
S301
J301
J302
P301
C314
R337
R338
P608B
R342
P607B
C585
P301
R335
R344
R331
C311
R301
R305
C301
R307
R339
R336
R597
C584
R586
C581
R584
R582
C580
R580
Q581
R585
R583
C583
1
R594
R591
R581
R31
D581
D580
C582
L507
R589
R593
R318
R336
R593
P303
R597
C586
C312
R334
R342
R335
P607B
R344
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