Table Of Contents - Sony PS-DJ9000 - Stereo Turntable System Service Manual

SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, "metallized" knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers' instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The "limit" indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
0.15µF
1.5kΩ
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS AP-
PEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
2
AC
voltmeter
(0.75V)
Earth Ground

TABLE OF CONTENTS

1. GENERAL
..................................................................... 3
2. DIAGRAMS
2-1. Circuit boards Location ...................................................... 5
2-2. Schematic Diagram - Main Section - ................................ 6
2-3. Schematic Diagram - Motor Section - .............................. 7
2-4. Printed Wiring Board - Main Section - ............................. 8
2-5. Printed Wiring Board - Power Section - ........................... 9
2-6. Printed Wiring Board - Motor Section - .......................... 10
3. EXPLODED VIEWS
3-1. Bottom Section ................................................................. 11
3-2. Cabinet Section ................................................................. 12
4. ELECTRICAL PARTS LIST
.................................... 13