SERVICING NOTES
SAFETY CHECK-OUTCHUCK PLATE JIG ON REPAIRING
After correcting the original service problem, perform the folloOn repairing CD section, playing a disc without the CD lid, usewing
safety check before releasing the set to the customer:Chuck Plate Jig.
Check the antenna terminals, metal trim, Ometallized� knobs, scrY Code number of Chuck Plate Jig: X-4918-255-1ews,
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 microamperes).
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 manufacturersO instructions to use theseLASER DIODE AND FOCUS SEARCH OPERATION
instruments.CHECK
1. Turn on POWER button and press CD button to CD position.
2. A battery-operated AC milliammeter. The Data Pr2. ecision 245Open the CD lid.
digital multimeter is suitable for this job.3. Turn on S801 as following figure.
4. Press the ( P (CD) button.
3. Measuring the voltage drop across a resistor by5. means of a Confirm the laser diode emission wVOMhile observing the objecting
or battery-operated AC voltmeter. The Olimit� indication is 0.75lens. When there is no emission, Auto Power Control circuit or
V, so analog meters must have an accurate low-voltaOptical Picge scale. Thk-up is breoken.
Simpson 250 and Sanwa SH-63Trd are examples of a passiObjectivvee lens moves up and down three times for focus search.
VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
S801
To Exposed Metal
Parts on Set
AC
0.15?F1.5kWvoltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
� 3 � |
ACEC
SONY
