Sony CDP-M11 - Electrical Leakage and Safety Checks

CDP-M11/M12/M21/M41
MODEL IDENTIFICATION
~ SPECIFICATION LABEL - ree
CDP-M11 CDP-M12
CDP-M12 CDP-M21
CDP-M21 CDP-M41
SONY. MODEL NO. VILLI
MMMM
SONY. MODEL NO. LLLLLLD
SERIAL NO.
MADE IN FRANCE
SERIAL NO.
MADE !N JAPAN
AEP MODEL: AC220-230V, 50/60Hz AEP MODEL: AC220-230V, 50/60Hz
Australian MODEL: AC240V, 50/60Hz UK MODEL: AC240V, 50/60Hz
E, Saudi Arabian MODEL: AC110-120, 220-240V, 50/60Hz, 12W
SAFETY CHECK-OUT
After correcting the original service problem, perform the 3. Measuring the voltage drop across a resistor by means of a
following safety check before releasing the set to the customer: VOM or battery-operated AC voltmeter. The “limit indica-
Check the antenna terminals, metal trim, "metallized" knobs, screws, tion is 0.75V, so analog meters must have an accurate low-
and all other exposed metal parts for AC leakage. Check leakage as voltage scale. The Simpson 250 and Sanwa SH-(3Trd are
described below. examples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2V AC range are
LEAKAGE TEST suitable. (See Fig.A)
The AC leakage from any exposed metal part to earth ground To Exposed Metal
and from all exposed metal parts to any exposed metal part having Parts on Set
a return to chassis, must not exceed 0.5mA (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 | AC
‘ voltmeter
instruments. (0.75 V)
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
2 Earth Ground
Fig. A. Using an AC voltmeter to check AC leakige.