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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.
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)
Fig. A. Using an AC voltmeter to check AC leakage.
0.15µFTo Exposed Metal
Parts on Set
1.5k-„¦AC
voltmeter
(0.75V)
Earth Ground
TABLE OF CONTENTS
1. GENERAL
..................................................................... 3
2. DIAGRAMS2-1. 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 VIEWS3-1. Bottom Section ................................................................. 11
3-2. Cabinet Section ................................................................. 12
4. ELECTRICAL PARTS LIST .................................... 13
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SECTION 1
GENERAL
1 POWER ON/OFF switch
2 Spindle
3 Strobo lamp
4 START/STOP button
5 Slip mat
6 Platter
7 TARGET LIGHT and release button
The TARGET LIGHT allows you to see the
position of the stylus in the dark. Push and
depress the TARGET LIGHT to turn it off.
Push the release button to raise the light again
and turn it on.
8 Cartridge and headshell
9 Finger lift
q; PITCH BEND + and -“ buttons
qa Insulator
qs Dust cover
qd Headshell holder
qf Counter weight
qg Hinge
qh 45 adaptor
qj height adj (adjusting) lever
Use this lever to adjust the vertical position of the
tonearm (wd).
qk LOCK lever (for height adjustment)
ql ANTI-SKATING dial
w; Cueing lever
wa Arm stand
ws Speed-adjustment hole
This hole is for use by qualified service
technicians only.
wd Tonearm
wf PITCH ADJ. (adjusting) knob
wg QUARTZ lock button
wh SPEED (33/45) button
wj Locking ring
1qs
qd
qf
qg
qh
qj
qk
ql
w;
wa
ws
wd
wf
wg
wh
wj 2
3
4
5
6
7
8
9
0
qa
This section is extracted from
instruction manual.
