Onkyo A 7055 Service Manual

Page 1

SERIAL NO. 3003

ONKYO SERVICE MANUAL

SOLID STATE STEREO PRE MAIN AMPLIFIER SOLID STATE AM/FM STEREO TUNER

model A-7055 model T-4055

INDEX

Item Page Item Page
model A4055 model T4055
Specifications 1 *~ 2 Specifications 10
Component Locations 2 Component Locations 11
Adjusment of the Idling Current 3 Clnssis Layout 12
Caution 3 Dial Cord Arrangement 12
Parts List 4 ~ 5 Alignment Procedure ISNM
Circuit BoankComponent Location 6 N 7 Caution 14
Circuit Diagram 8 ~ 9 Parts List 15N16
Circuit BoarrkComponent Location 17-43
Circuit Diagram 20~21
Line Voltage and Fuse 22
Packing Procedure 22

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4. PARTS LIST

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CIRCUIT NO. DESCRIPTION SPECIFICATION lam STOCK N0.
1:] Equalizer Amp assembly NAEmss 1 12900535
U 2 Te..e Amp assembly NATO-186 1 12969586
U 3 Ma... Amp assembly NAMA7187 1 12969587
U 4 Power Supply assembly NAFI-Isa 1 12900503
0001.0002 Transistor zscmls1 2 2210033
(100301004 . stIBSMrorN) 2 22000520r2200053
0005,0006 . 25A627M(orN) 2 22000620r2200063
D001 sum... Diode 5133 1 223810
P1101 Lam... 6.3V 015A 1 210003
T001 TransformerTPower NPTTSJZADGQ I 230045
c007rC009 Electrolytic CE62W35V4700/4F 2 350403011
ggigfigié Variahle Resistor N24RDC500KMN250K32T 1 5104006 (Double gang)
5 1 Swilrh-Rmary NRsrstoY 1 250114 (Selector)
5 3 . 111254651017 1 250115 [Tape manner)
38159 ~ 10352211720175 2 250117 (Tone)
s 13 . NRS-124~20Y 1 250118-1 (Speakers)
52 swuchssnde Nssrzazs 1 250121 (513111;;iy}
512 . N55422: 1 250122 lpre-malnl
2:15;? SwItchTLever NqungSL 5 2501121 (hgiffiflrylflj
514 swmelrrower NPS-lllLAZ 1 250157 (Power)
56,57 Sw1191.»1 ver 01 12.20511. 7 fl Frequency shIft]
sockerpiloc Lamp VE-0202 1 250124
SuckerTransislor 5153905 4 250144
JaelrSIereu Head Phone 3P64M 1 250126
Fuse 2Ar'l' 2 252002 (AC l.r.e)
,. 2.5A-T1A) 4 252008 (13:.
,. 1.51141 1 252007 lump)
Bouom cover 1 270295
Rubber Cushion 4 250379
Sllm Cloth Piece 1 270500
From Panel 1 280707
End Cav 2 280367
F acet 1 250375
Knob Sheet 1 230377
Sol. Block 2 270559
Rating Plate 1 252974
Knoerolume 1 253053
Knoeralance 1 25306471
Knolr Selecmr 1 283062
KnoeronelSpeakers, Tape monitor) 4 233001
Knoerush Swnch 1 28307]
Knob Guide 1 230374
Joiner 4 280376
Amp 135.. assembly 1 200708
Master Cam... Box 1 290332
Side Pad 2 290203
Fuse AA-T 2 252014 lAC lmel
011113151115
0101,0102 Transistor 25A493lGR> 2 2210235
010311104 zsc1000101) 2 2210200
(1105,0100 zscasslxl 2 2210290
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