Service Manuals, User Guides, Schematic Diagrams or docs for : Sony Sony IAD-IF70 Input_adaptor

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Sony IAD-IF70 Input_adaptor


>> Download Sony IAD-IF70 Input_adaptor documenatation <<

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                     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
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). Leak-
age 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




                                                AC
            0.15



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