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SERVICE MANUAL

INTEGRATED STEREO AMPLIFIER
A-905TX
INTEGRATED STEREO AMPLIFIER
CD
MD
TUNER
TAPE
STANDBY/ON
LINE/ DVD
CDR/PC
STANDBY
BASS
TREBLE
BALANCE
POWER
PHONES
ON
OFF
+
+
L
R
UDT
120V AC, 60Hz
UPT
230-240V AC, 50Hz
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK
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.
VOLUME
WIDE RANGE AMP TECHNOLOGY
INPUT
DIRECT
SOURCE DIRECT
DIRECT
ACOUSTIC
PRESENCE
TONE
OFF /1/ 2
A-905TX
ON THE
A-905TX
Ref. No. 3677
052001
STANDBY/ ON
GRAPHIC EQ
CLOCK
SLEEP
EFFECT
MODE
TUNER
INPUT
PRESET
F M
A M
TAPE
PAUSE / STEP
DVD
M D
REPEAT
SCROLL
PLAY MODE
CLEAR
REC
REPEAT
RANDOM
C D
MEMORY
CLEAR
DISC
CDR
REPEAT
PLAY MODE
TONE
CLEAR
REC
MUTING
1
2
3
TIMER
4
5
6
UP/DOWN
7
8
9
VOLUME
ACOUSTIC
PRESENCE
- - / - - -
10 / 0
ENTER
REMOTE CONTROLLER
RC - 456 S

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Summary of Contents for Onkyo TH-50PE8U

  • Page 1: Service Manual

    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...
  • Page 2: Specifications

    A-905TX SPECIFICATIONS PART-XX SERVICE PROCEDURES PART-XX Replacing the fuses DESCRIPTION This symbol located near the fuse indicates that the REF.NO. PART NO. fuse used is show operating type, For continued protection against F901 252158 1.6A-UL/T-237, Fuse <DT> fire hazard, replace with same type fuse , For fuse rating, refer to 252069 0.8A-SE-EAK, Fuse <PT>...
  • Page 3 A-905TX CHASSIS EXPLODED VIEW ############ P901 P402 P402 P584A P701 P801 Q527 Q525 Q523 Q524 Q526 Q528 F901 F904 F903 F902 T901 E860...
  • Page 4 A-905TX CHASSIS EXPLODED VIEW PARTS LIST ############ REF NO. PART NO. DESCRIPTION REF NO. PART NO. DESCRIPTION 27111123 Front bracket P402 27190011 KGLS-6S, Holder 838130088 3TTB+8B, Self tapping screw P584A 880009 Plastic rivet, NRP-345 <PT> 838430088 3TTB+8B(BC), Self tapping screw P701 27191106 UAMS-05S-2, Holder...
  • Page 5: Schematic Diagram

    A-905TX SCHEMATIC DIAGRAM-1 TO NAAF-6631 P405B P405C NADG-6630 Acoustic Presence AMP&VR R551 SUBWOOFER PREOUT R543 (1/2W) P582 24.6 (1/2W) 24.1 Q523 Q519 P307 Q301 Q531 R351 R353 2SA965 2SC4512 R581 LEFT TC9273N-010 2SC1845 R547 L503 R603 2.2K Q527 R571 2SC3421 Q515 VDD 28 R352...
  • Page 6 A-905TX SCHEMATIC DIAGRAM-2 Tone bass NAAF-6631 NJM4565D-D ACOUSTIC PRESENCE C403 R401 R407 Q409 3.3K 2SK246 C407 (1/2) R523 47/50 Q401 R505 R507 R527 R531 47/50 R409 R421 1.8K 1.8K D405 R403 220K (1/2W) 24.1 220K (1/2W) (1/4W) C405 23.5 100K PREAMPLIFIER R405 23.5...
  • Page 7 A-905TX PC BOARD CONNECTION DIAGRAM XXXXX SPEAKERS SUBWOOFER PROCESSOR CDR/PC REMOTE TAPE LINE/DVD PRE OUT PLAY REC PLAY CONTROL PLAY REC TUNER NAETC-6636 P582 P303 P302 P301 P307 P306 P305 P304 P586B P351A SPEARKER P584 P585B TERMINAL NAETC-6637 PC BOARD TERMINAL P311A JL581C...
  • Page 8: Printed Circuit Board Parts List

    A-905TX PRINTED CIRCUIT BOARD PARTS LIST-1 MAIN CIRCUIT PC BOARD (NADG-6630-4B/C) CIRCUIT NO. PART NO. DESCRIPTION CIRCUIT NO. PART NO. DESCRIPTION R563,R564 453530474 4.7ohm +/-5%, 1/2W, Metal oxide R565,R566 453530824 8.2ohm +/-5%, 1/2W, Metal oxide Q301 22240881 TC9273N-010 R575,R576 5210257 N06HR500BC, Trimming Q701 22241481...
  • Page 9 A-905TX PRINTED CIRCUIT BOARD PARTS LIST-2 ACOUSTIC CIRCUIT PC BOARD (NAAF-6632-4B/C) CIRCUIT NO. PART NO. DESCRIPTION CIRCUIT NO. PART NO. DESCRIPTION Capacitors C746 353721019 100uF0, 6.3V, Elect. Q401 22240191 NJM4565D-D C714,C715 353741009 10uF, 16V, Elect. Q402,Q403 22240250 NJM2068L-D C717,C718 353741009 10uF, 16V, Elect.
  • Page 10 A-905TX MICROPROCESSOR TERMINAL DESCRIPTION Q701:HD404316-E30H Pin No. Function Descriptions TEST Test pin. RESET System reset input pin. OSC1 Pins to connect the ceramic oscillator 4.0MHz. OSC2 Ground pin. AVSS Analog reference ground for A/D converter. SEL IN-1 Rotary switch connection input pin for input selector. SEL IN-2 KEY IN Operation key connection pin.
  • Page 11 A-905TX MICROPROCESSOR CONNECTION DIAGRAM Q701:HD404316E04H ACOUSTIC PRESENCE INDICATOR SOURCE INDICATOR DRIVER GREEN Q707 74HC595 PROTECTER DETECTOR CIRCUIT INPUT SELECTOR Q301 TC9273N-010 ACOUSTIC PRESENCE CIRCUIT SBASS-3 TEST SYSTEM RESET RESET SBASS-2 Q703 SBASS-1 OSC1 INPUT MUTING OSC2 Q415-Q418 MICROPROCESSOR Q701 INPUT AVSS HD404316-E30H SELECTOR...
  • Page 12: Idling Current Adjustment

    A-905TX ADJUSTMENT PROCEDUERS IDLING CURRENT ADJUSTMENT 1. Before Idling adjustment, turn the trimming resistors R575, R576 to counter clockwise. 2. Connect the DC voltmeter to terminal P503, P504. 3. After turn POWER to ON, adjust the trimming resistors R575, R576 so that the reading of voltmeter becomes 2.0 mV.
  • Page 13 A-905TX OOOOOOO PAD ASSEMBLY PROCEDURES-1 ############ ASSEMBLING OF PAD A Procedures : 1 to 5 : Line shows folding direction : Line shows folding direction Pin mark side Pin mark Other side...
  • Page 14 A-905TX OOOOOOO PAD ASSEMBLY PROCEDURES-2 ############ ASSEMBLING OF PAD B Procedures : 1 to 5 : Line shows folding direction Pin mark side Pin mark Other side...
  • Page 15 A-905TX OOOOOOO PAD ASSEMBLY PROCEDURES-3 ############ INSERT PAD A TO PAD B Pad A Pad B...
  • Page 16: Packing View

    A-905TX PACKING VIEW PART-XX Bottom side Bottom side PARTS LIST REF NO. PART NO. DESCRIPTION 29091886 Pad A 29091887 Pad B 29095835 Protection sheet 0.515*650*550 29110149 Tape 282301 Staple 29110141 Tape 29053720 Carton box 29362820 Label EAN 24140456 RC-456S, Remote controller 3010054 Battery, UM-3 29343066...
  • Page 17 Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN Tel: 072-831-8111 Fax: 072-833-5222 ONKYO U.S.A. CORPORATION 18 Park Way, Upper Saddle River, N.J. 07458, U.S.A. Tel: 201-785-2600 Fax: 201-785-2650 E-mail: onkyo@onkyousa.com ONKYO EUROPE ELECTRONICS GmbH Industriestrasse 20, 82110 Germering, GERMANY Tel: 089-849-320 Fax: 089-849-3265 E-mail: info@onkyo.de...

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