Onkyo MPC 501 Service Manual

Page 1

REF. NO. 3523

ONKYO® SERVICE MANUAL

PERSONAL COMPONENT SYSTEM
MPG-501

Black model

230V AC. 50H?

D 120 AC, 60H1,

SAFETY-RELATED COMPONENT WARNING
COMPONENTS IDENTIFIED BY MARK A ON THE
SC HEMATIC 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 MEA-
SUREMENTS TO DETERMINE THAT EXPOSED PARTS
ARE ACCEPTABLY INSULATED FROM THE SUPPLY
CIRCUIT BEFORE RETURNING THE APPLIANCE TO
THE CUSTOMER.

I ON KYO
MIIIIII IIIIMPIIIIIIIIS

_1,

Page 2

TABLE OF CONTENTS
TABLE OF CONTENTS ........................................................................................................................................... 2
SERVICE PROCEDURES .............................................................................................................................................. 3
CAUTION ON REPLACEMENT OF OPTICAL PICKUP ................................................................................. 3
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING/LASER WARNING LABELS . 3
IC BLOCK DIAGRAMS ............................................................................................................................................... 5
PC, BOARDS - AMPLIFIER/CASSETTE DECK (KA-SOI) II
PC. BOARDS - CD/I'UNER (CT-501) ................................... 21
WIRING DIAGRAM , AMPLIFIER/CASSETTE DECK (KA-SOl) .......................................................................... 33
WIRING DIAGRAM - CD/TUNER (CT-501) .......... 35
BLOCK DIAGRAMS - TUNER & MAIN BLOCK . 37
BLOCK DIAGRAMS - AMPLIFIER/CASSETTE DECK BLOCK ............................................................................ 38
BLOCK DIAGRAMS - CD DECODER BLOCK ................... 39
CHASSIS EXPLODED VIEW PARTS LIST - CD/TUNER .. .. 40
CHASSIS EXPLODED VIEW - CD/IUNER (CT-501) .............................................................................................. 4|
CHASSIS EXPLODED VIEW - AMPLIFIER/CASSETTE DECK (KA-SOI) ........................ 43
CHASSIS EXPLODED VIEW PARTS LIST - AMPLIFIER/CASSETTE DECK (KA-SOI) . ., 45
TUNER ADJUSTMENTS ............................................................................................................................................ 46
TAPE ADJUSTMENT 50
CD ADJUSTMENTS .. ,. 52
PC BOARD PARTS LIST » AMPLIFIER/CASSETTE DECK (KA-501) 53
PC BOARD PARTS LIST » CD/TUNER (CT-50]) I. 55
PACKING LIST N 58

SCHEMATIC DIAGRAMS ,.
SPECIFICATIONS, , , ,

Page 20

MPG-501

TUNER ADJUSTMENTS

Equipment required:

1. AM signal generator
2. FM signal generator
3. VTVM

Notes:

1. Signal input must be as low as possible to avoid overload and
clipping. (Use highest sensitivity of output indicator.)

2. Volume control at maximum.

4. DC voltmeter

3. Standard modulation is 400Hz at 30% amplitude for AM,
lOOOHz at 22.5kHz deviation for FM (Mono).
4. Connect 8 ohm load across speaker jack.

MW IF Adjustment
Signal Source Siggal Generator Output Frequency Adjustment Remarks
requency Setting
MW IF sweep Oscilloscope Adjust for
generator connected to maximum &
connected to Sweep centered IC101 in Tuning to CF 103 S mmetrical
CN002 pin 1 450kHz p lOOOkHz (See Fig. l ) y
& GND 19 & GND. curve.
® ' ® (See Fig. 2 )
MW RF adjustment
Signal Source Signal Generator Output Frequency Adjustment Remarks
Frequency Settlng
DC meter
MW signal across L103 DC meter
generator MW 53lkHz R506 & Lowest freq. (See Fig. 1 ) 1Vi0.05V
connected to G CN002 pin 1
. . TC103 DC meter
& 3D. MW 1602kHz Highest freq. (See Fig. 1) 8V i0.05V
Repeat adjustments until the DC values are achieved.
MW 603kHz MW 603kHz L101
VTVM (See Fig. 1)
connected to Adjust for
CN21] pin TC101 maximum
MW 1404kHz 1 &p1n 3. MW 1404kHz (See Fig. 1) output
Repeat adjustments as necessary to minimise tracking error.

, 47 m