Onkyo A905TX Service Manual

SERVICE MANUAL

INTEGRATED STEREO AMPLIFIER

A-905TX

Ref. No. 3677

052001

STANDBY/ON

STANDBY

POWER

ON OFF

INTEGRATED STEREO AMPLIFIER

MD TUNER

TAPE

LINE/DVD

CDR/PC

PHONES

TREBLEBASS BALANCE

—+ —+ LR

UDT 120V AC, 60Hz UPT 230-240V AC, 50Hz

VOLUME

DIRECT

SOURCE DIRECT

DIRECT

WIDE RANGE AMP TECHNOLOGY

TONE

STANDBY/ ON

PRESET

REPEAT

PLAY MODE

REPEAT

MEMORY

REPEAT

TONE

INPUT

ACOUSTIC PRESENCE

OFF/1/2

A-905TX

TIMER

UP/DOWN

ENTER

CLOCK SLEEP EFFECT

F MA M

SCROLL

CLEAR

REC

RANDOM

CLEAR

DISC

PLAY MODE

CLEAR

REC

123

456

789

- - / - - -

10 / 0

REMOTE CONTROLLER

PAUSE / STEP

ACOUSTIC PRESENCE

GRAPHIC EQ

MODE

INPUTTUNER

TAPE

MUTING

VOLUME

DVD

M D

C D

CDR

456

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ON THE

SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE

CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.

REPLACE THESE COMPONENTS WITH ONKYO

PARTS WHOSE PART NUMBERS APPEAR AS SHOWN

IN THIS MANUAL.

MAKE LEAKAGE-CURRENT OR RESISTANCE

MEASUREMENTS TO DETERMINE THAT EXPOSED

PARTS ARE ACCEPTABLY INSULATED FROM THE

SUPPLY CIRCUIT BEFORE RETURNING THE

APPLIANCE TO THE CUSTOMER.

SPECIFICATIONS

PART-XX

A-905TX

SERVICE PROCEDURES

PART-XX

Replacing the fuses

This symbol located near the fuse indicates that the fuse used is show operating type, For continued protection against fire hazard, replace with same type fuse , For fuse rating, refer to the marking adjest to the symbol.

Ce symbole indique que le fusible utilise est e lent. Pour une protection permanente, n'utiliser que des fusibles de meme type. Ce demier est indique la qu le present symbol est apposre.

REF.NO.

F901 252158 1.6A-UL/T-237, Fuse <DT>

F902-F904 2.5A-SE-EAK, Fuse <PT>

NOTE:

<DT> : Asian model only for 120V <PT> : Asian model only for 230V

PART NO.

252069 0.8A-SE-EAK, Fuse <PT> 252075

DESCRIPTION

A-905TX

CHASSIS EXPLODED VIEW

############

P901

P584A

A40

A81

P801

A11

A43

F901

F902

A11

A26

A43

A41

A25

T901

F904

U10

A27

F903

A34

Q523

A27

A34

Q527

A10

E860

Q525

Q526

A10

P402

Q524

Q528

A10

A16

P402

A28

A10

P701

A67

A10

A49

A50

A49

A52

A10 A58

A63

A1 A56

A53

A10

A13

A11

A54

A47

A55

A66

A46

A49

A51

A61

A65

A64

A11

A73

CHASSIS EXPLODED VIEW PARTS LIST

############

REF NO. PART NO. DESCRIPTION REF NO. PART NO. DESCRIPTION

A1 27111123 A10 838130088 3TTB+8B, Self tapping screw P584A 880009 Plastic rivet, NRP-345 <PT> A11 838430088 3TTB+8B(BC), Self tapping screw P701 27191106 UAMS-05S-2, Holder A13 28198862 Facet, VOL P801 25055436 or NPLG-2P418, Shorted plug A16 27100375D Chassis 25055945 A25 27160451B

A26 29110083 Adhesive tape, CROSS-16U Q523,Q524 2202303 or A27 801525 3TTB+8B(BC), Special screw <PT> 2202304 or

A28 801433 3SMS8W.SW+14B(BC), special screw Q525,Q526 2202313 or A34 27141530A Retainer, HS-2 2202314 or A40 27300750 Bussing cord 2202315 A41 27122831 Rear panel <DT> Q527,Q528 2212654 or

A43 830440089 4TTC+8C(BC), Self tapping screw A46 28184759-1 A47 29362571 A49 838930088 A50 838430107 3TTB+10S(BC), Self tapping screw A51 27212298 Front panel A52 28198894 Facet 7P A53 28198895 Facet 1P A54 28198925 Facet A A55 27268037 Guide A A56 28325133 Knob, FM A58 28191798 Clear plate, RE A61 28325926 Knob, INPUT A63 28135247Y Badge A64 28325925 Knob, VOL A65 28325674 Knob, TD A66 28325927 Knob, TONE A67 28325673 Knob, POWER A73 27175323 Leg AS A81 29362630 Label, PROCESSOR F901 252158 1.6A-UL/T-237, Fuse <DT>

F902-F904 2.5A-SE-EAK FUSE <PT>

NOTE: THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.

27160452B

838430088 3TTB+8B(BC), Self tapping screw <DT> 2202305

27122832 Rear panel <PT> 2212653

252069 0.8A-SE-EAK FSBFUSE, Fuse <PT> 252075

Front bracket P402 27190011 KGLS-6S, Holder

Heat sink <DT> P901 253277MIL AS-UC-2#18, Power supply cord <DT> Heat sink <PT> 253193HIT AS-CEE, Power supply cord <PT>

Top cover Label, WARNING <DT,PT>

3TTB+8B(UN), Self tapping screw

2SC4512-O or

2SC4512-Y or

2SC4512-P, Transistor

2SA1726-O or

2SA1726-Y or

2SA1726-P, Transistor

2SC3421-Y or

2SC3421-O, Transistor

T901

U10

NOTE:

<DT> : Asian model only for 120V <PT> : Asian model only for 230V

CAUTON :

Replacement of the transistor of mark * ,if necessary, must be made from the same beta group(HFE) as the original type.

2301423 NPT-1374D, Power transformer <DT> 2301424 NPT-1374P, Power transformer <PT> 1A905530-4B 1A905530-4C 1A905531-4B 1A905531-4C 1A905532-4B 1A905532-4C 1A905533-4B 1A905533-4C 1A905534-4B 1A905534-4C 1A905536-4B 1A905536-4C 1A905537-4B 1A905537-4C 1A905539-4B 1A905539-4C 1A905540-4C

NADG-6630-4B, Main circuit PC board ass'y <DT> NADG-6630-4C, Main circuit PC board ass'y <PT> NAAF-6631-4B, Preamplifier circuit PC board ass'y <DT> NAAF-6631-4C, Preamplifier circuit PC board ass'y <PT> NAAF-6632-4B, Acoustic circuit PC board ass'y <DT> NAAF-6632-4C, Acoustic circuit PC board ass'y <PT> NAPS-6633-4B, Power supply circuit PC board ass'y <DT> NAPS-6633-4C, Power supply circuit PC board ass'y <PT> NADIS-6634-4B, Display circuit PC board ass'y <DT> NADIS-6634-4C, Display circuit PC board ass'y <PT> NAETC-6636-4B, Speaker terminal PC board ass'y <DT> NAETC-6636-4C, Speaker terminal PC board ass'y <PT> NAETC-6637-4B, Terminal PC board ass'y <DT> NAETC-6637-4C, Terminal PC board ass'y <PT> NAETC-6639-4B, Power switch PC board ass'y <DT> NAETC-6639-4C, Power switch PC board ass'y <PT> NAETC-6640-4C, Fuse PC board ass'y <PT>

A-905TX

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