Onkyo K-505-TX Service manual

K-505TX

Ref. No . 3675

SERVICE MANUAL

STEREO

CASETTE DECK

MODEL K-505TX

STEREO CASSETTE TAPE DECK

CASSETTE LOADING MECHANISM

STANDBY / ON

ALBUM

STANDBY

FADE

Silver models

SUPP,SUPT

SUDT

LEVEL

REC

COUNTER

RESET

230V AC,50Hz

120V AC,60Hz

052001

DOLBY

REV.

MODE

505X

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 NUMBER 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

K-505TX

Track format

4-tracks, 2-channels

Erasing system

AC erase

Tape speed

4.8 cm/sec.

Wow and flutter

0.1 % (WRMS)

0.2 % (DIN)

Frequency response

Metal position tape

30 to 15,000 Hz ± 3 dB

High position tape

30 to 14,000 Hz ± 3 dB

Normal position tape

30 to 13,000 Hz ± 3 dB

Signal to noise ratio

• 54 dB (metal position tape, Dolby NR off)

• Noise reduction of 10 dB above 5 kHz and 5 dB at 1 kHz is possible with Dolby B NR.

• Noise reduction of 20 dB at 5 kHz is possible with Dolby C NR.

Input Jacks

LINE IN: 2

Input sensitivity: 80 mV Input impedance: 50 kohms

Output Jacks

LINE OUT: 2

Standard output level: 500 mV Output load impedance:

over 50 kohms

Motors

DC servo motor: 1

Heads

REC/PB: Special Hard Permalloy: 1 Erase head: Ferrite: 1

Power supply rating

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

Power consumption

12 W (230-240 V, 50 Hz) 14 W (120 V, 60 Hz)

Dimensions

205 mm × 76 mm × 278 mm (Width × Height × Depth)

Weight

2.6 kg

Specifications and external appearance are subject to change without notice as a result of product improvement.

SERVICE PROCEDURES

1. Replacing the fuse

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

Ce symbole indique que le fusible utlise est a rapide. Pour une protection permanente, n'untiliser que fusibles de meme type. Ce darnier est la qu le present symbol est appse.

CIRCUIT NO. PART NO. DESCRIPTION F901

252074 2A-SE-EAK,Fuse

BLOCK DIAGRAM

K-505TX

R/P HEAD

LINE

OUT

ERASE HEAD

Q401-Q405 L401.L402.L403

POWER TRANSFORMER AND REGULATOR

T901

D901.D902

D905.D906

P.B.AMP. P.B. LEVEL

Q102

Q101

Q103.Q104

BIAS OSC AND HX PRO

12V(for SIGNAL)

12V(for MECHA)

-22V(for F.L. TUBE)

70/120

R115.R116

Q901

Q903

Q906

DOLBY NR. REC EQ. METER AMP

Q201

MICROPROCESSOR

5V (for MICROPROCESSOR)

Q905

Q701

DISPLAY

Q709

S717 AUTO ADJUSTMENT START KEY

KEY CONTROL

MECHA AND DRIVER

TAPE SPEED R716

EXPLODED VIEW

K-505TX

P902A

F901

P702

P101

P703

P705

T901

Z001

PARTS LIST

REF.NO.PART NO. DESCRIPTION 1 27100334A

2 27175323

3 27175325

4 838130088

5 27190897

6 27301394

7 27191045

8 28140020

9 830440069

10 27150407B

11 27300750

12 27191137

13 27191138

14 833130100

15 27122849

16 838430088

17 27111214

18 28141456

19 27212314

20 28135247Y

21 28198864

23 28191796A

24 28184795

25 28141470

26 838930088

27 28148476

P101 2009990659

P702 20022392635A

P703 2009990469

P705 204319013

P902A 253193HIT

253277MIL

T901 2301298

2301297

U1 1N281546-1A

1N281546-1B

U2 1N281547-1A

1N281547-1B

U3 1N281548-1A

1N281548-1B

U4 1N281549-1A

1N281549-1B

U5 1N281550-1A

1N281550-1B

U6 1N281551-1A

1N281551-1B

Z001 244247

F901 252074

Chassis

Leg

3TTB+8B.Self tapping screw

KGLS-3S.Holder

HL-18-0.Clamp

KGPS-3.5S.Holder

4TTC+6C(BC).Self tapping screw

Shield plate

S-RELIEF #2271.Bushing cord

ML Holder

MR Holder

3TTP+10P.Self tapping screw

Rear panel

3TTB+8B(BC).Self tapping screw

Front bracket

Cushion

Front panel

Badge

Facet

Clear plate

Cover

Cushion

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

(TRAY).Door

NSAS-14P0919.Socket AS

NSAS-26P0918.Socket AS

NSAS-10P0623.Socket AS

NCFC3-19013.F.F.C

AS-CEE. Power supply cord

AS-UC-2#18.Poewr supply cord <D>

NPT-1314P.Power transformer

NPT-1314D.Power transformer <D>

NAAR-7146-1A.Main cuircuit PC board ass'y <D>

NAAR-7146-1B,Main circuit PC board ass'y

NAAF-7147-1A,Playback amp. PC board ass'y <D>

NAAF-7147-1B,Playback amp. PC board ass'y

NAAF-7148-1A,Dolby circuit PC board ass'y <D>

NAAF-7148-1B,Dolby circuit PC board ass'y

NAAF-7149-1A,Recording amp. PC board ass'y <D>

NAAF-7149-1B,Recording amp. PC board ass'y

NAPS-7150-1A,Power transformer PC board ass'y <D>

NAPS-7150-1B,Power transformer PC board ass'y

NADIS-7151-1A,Display circuit PC board ass'y <D>

NADIS-7151-1B,Display circuit PC board ass'y

CMAL2Z7.Deck mechanism

2A-SE-EAK,Fuse <European model only>

K-505TX

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