Onkyo K-501A Service Manual
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Onkyo K-501A Service Manual

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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.
SERVICE MANUAL
SERVICE MANUAL
CASSETTE TAPE DECK
K-501A
MODEL
UPP
230-240V AC, 50Hz
UDT
120V AC, 60Hz
UGT
220-230V AC, 50/60Hz
ON THE
K-501A
Ref. No. 3718
112001

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Summary of Contents for Onkyo K-501A

  • Page 1 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

    K-501A SPECIFICATIONS Track format Power supply rating 4-tracks, 2-channels AC 230-240 V, 50 Hz AC 220-230 V, 50/60 Hz Erasing system AC 120 V, 60 Hz AC erase Power consumption Tape speed 13 W (230-240 V, 50 Hz) 4.8 cm/sec.
  • Page 3 K-501A PANEL VIEW FRONT PANEL Rec/Pause button STANDBY/ON button Rec/Pause indicator STANDBY indicator FADE button/FADE indicator Cassette in indicator ALBUM button/ALBUM indicator Eject button STEREO CASSETTE TAPE DECK CASSETTE LOADING MECHANISM CD DUBBING STANDBY / ON DOLBY NR REV MODE...

  • Page 4: Exploded View

    K-501A EXPLODED VIEW P901A P101A F901 P702A P702A P703A T901...

  • Page 5: Parts List Exploded View

    K-501A PARTS LIST EXPLODED VIEW REF. NO. PART NO. DESCRIPTION 27111266 Front bracket 27191165 Holder (Door) 28198948 Facet(IN) 28148505 Door 27180583 Spring 28325983 Recording button ass'y 27100415 Chassis 27191164 Holder (Mechanism) 27300750 #2271,Bushing 27212366 Front panel 28198939 Facet(S) 28198946 Facet(PLAY)

  • Page 6: Parts List

    K-501A EXPLODED VIEW CASETTE MECHANISM METAL F REC PACK R REC PARTS LIST REF.NO PART NO. DESCRIPTION FF18W- F/R belt FF19Y- Main belt F567-626 Switch PC board ass'y FF26K- Flywheel ass'y F513-891 Recording/Play head ass'y F514-129 Pinch roller R F514-130...

  • Page 7: Block Diagram

    K-501A BLOCK DIAGRAM K E Y C O N T R O L & D I S P L A Y D O L B Y N R , R E C E Q , M E T E R A M P P .

  • Page 8: Schematic Diagram

    K-501A SCHEMATIC DIAGRAM 1 C 2 4 3 1 0 0 0 / 1 6 R 2 7 0 6 . 8 K I N P U T ( R ) U D Z S 4 . 7 B R 2 8 5 4 .
  • Page 9 K-501A N O T E SCHEMATIC DIAGRAM 2 A R E C R I T I C A L F O R S A F E T Y T H E C O M P O N E N T S...
  • Page 10 K-501A T E S T P O I N T SCHEMATIC DIAGRAM P 2 0 5 N O T E R C H L C H C 2 4 3 1 0 0 0 / 1 6 T H E C O M P O N E N T S...
  • Page 11 K-501A SCHEMATIC DIAGRAM MECHANISM SECTION Rec/Play/Erease Head 1. L + 2. L - R/P HD 3. R - 4. R + 5. E - E HD 6. E + Control circuit PC board UNLOAD SW LOAD SW MTR-(CW)(UNLOAD) MTR+(CCW)(LOAD) Main circuit PC board R.REC SW...
  • Page 12 K-501A PRINTED CIRCUT BOARD VIEW 1 L403 J103 C404 Main circuit PC board C402 L403 C413 NAAF-7383 L401 C420 L402 L401 J106 Q405 L402 L405 C103 J111 R117 C105 L405 C107 C111 J109 C113 C113 J114 L406 C112 C108 C106...

  • Page 13: Printed Circuit Board View

    K-501A PRINTED CIRCUIT BOARD VIEW 2 R408 R405 R406 R407 R401 R402 R404 R502 R503 Main circuit PC board NAAF-7383 R415 C423 R103 C425 R501 R119 R120 C426 R118 R104 R508 R509 R237 R247 R257 C424 R234 R244 R254 R238...
  • Page 14 K-501A PRINTED CIRCUIT BOARD VIEW 3 Power supply PC board NAPS-7384 T901 C901 R901 J901 C903 C904 T901 D901 D902 C909 C909 C701 J913 J909 J907 P702 J937 J911 J912 ROT_S J919 J926 J920 C907 J915 C907 J916 P703 J931...
  • Page 15 K-501A PRINTED CIRCUIT BOARD VIEW 4 Power supply PC board NAPS-7384 Soldering side D706 C703 C702 R726 R916 R706 Q710 R704 R725 R703 R801 R715 R802 R702 R803 R718 R804 R735 Q701 R717 Q713 Q701 R746 R572 R730 R745 R723...
  • Page 16 K-501A PARTS LIST CIRCUIT PARTS 1 REF. NO. PART NO. DESCRIPTION Q101 22240147 MPC1330HA Q102 222905 MPC1228HA Q201 22241144R3HI HA12169FB Q401 222959 MPC1297CA Q701 22241751R3 TMP87CH14F-3JJ5 Q702 22241609R2 BR93LC46F-WE2 Q707 22240239 TA7291S Q901,Q903 222780125NEC or MPC78M12HF 222780125JRC NJM78M12FA Q905 222780055...
  • Page 17 K-501A PARTS LIST CIRCUIT PARTS 2 REF. NO. PART NO. DESCRIPTION Coils L401,L402 231127 NCH-4183 L405,L406 231085 NCH-2133 L203,L204 233407 NMC-6079 L403 231215 NLO-2059 L701 230955R2 BK1608HS102-T Oscillator X701 3010341 CSTLS8M00G56 Capacitors C243,C907 354741029 1000uF,16V,Elect C909 C107,C108 354741019 100uF,16V,Elect C413,C705...
  • Page 18 K-501A PARTS LIST CIRCUIT PARTS 3 REF. NO. PART NO. DESCRIPTION R117,R409 443521214 120ohm +/-5% 1/2W,Metal oxide R410 443524704 47ohm +/-5% 1/2W,Metal oxide R413 443521004 10ohm +/-5% 1/2W,Metal oxide R115,R116 5210296 N06HR47KBE,Trimming R716 5210261 N06HR5KBC,Trimming Switches S717 25035699 NPS-111-S662 S801-S813...
  • Page 19 K-501A MICROPROCESSOR CONNECTION DIAGRAM Q701:TMP87CH14F 3.9K 1.8K Q201 FT 1 L402 Q102 FT 2 L401 11.5V Q401 Q101 Q203.Q204 Q205.Q206 TRAY OPEN DOL B TRAY CLOSE LM(R) TAPE IN LM(L) R.PLY1 BIAS CONT DET SWITCH DET SWITCH SYSTEM BUS R.PLY2 F.PLY1...
  • Page 20 K-501A MICROPROCESSOR TERMINAL DESCRIPTIONS Pin NO. Terminal DESCRIPTION DOLBYBLED Dolby B indicator control output pin TAPEINLED Cassette tape detection indaictor control output pin REVLED1 Reverse direction indicator control output pin REVLED2 Reverse direction indicator control output pin FWDLED1 Forward direction indicator control output pin...

  • Page 21: Adjustment Procedures

    K-501A ADJUSTMENT PROCEDURES PRECAUTIONS TEST EQUIPMENT/TOOL REQUIRED 1. Before adjustment, clean the following parts Audio Oscillator with an alcohol moistened swab. Digital frequency counter *recording/playback head *erase head Oscilloscope *pinch roller *capstan Attenuator 2. Do not use magnetized screwdriver for AC voltmeter adjustment.

  • Page 22: Adjustment Point

    K-501A ADJUSTMENT POINT P205 NCAF-7383 25137383A P.B.LEVEL R115 R116 R716 SPEED NCPS-7384 25137384 S717 VTVM PHASE CHART AF Attenuator 0 deg. 45 deg. K-501A AF OSC LINE IN LINE OUT 90 deg. 180 deg. VTVM K-501A LINE OUT...

  • Page 23: Packing View

    K-501A PACKING VIEW Accessories Front Front...
  • Page 24 K-501A PARTS LIST PACKING VIEW REF. NO. PART NO. DESCRIPTION 29092028A 29053865 Carton 29092029 Pad (S) 29363044 EAN Label 29095835 0.515x650x550,Sheet 29100097-1A 350x250,Polybag 2010376 Cord ass'y 2010375 3.5-MINI PLUG,Cord ass'y 29343267 Instruction manual E 29343268 Instruction manual CT <GT,DT> 29343269 Instruction manual U3GSWD <PP>...
  • Page 25 Tel: 072-831-8111 Fax: 072-833-5222 ONKYO EUROPE ELECTRONICS GmbH Industriestrasse 20, 82110 Germering, GERMANY Tel: 089-849-320 Fax: 089-849-3265 E-mail: info@onkyo.de ONKYO CHINA LIMITED Units 2102-2107, Metroplaza Tower I, 223 Hing Fong Road, Kwai Chung, N.T., HONG KONG Tel: 852-2429-3118 Fax: 852-2428-9039 HOMEPAGE http://www.onkyo.co.jp/...

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