Sony AZ1-L CHASSIS Service-Handbuch - Seite 10

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SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety checks before releasing the set to the customer:

1. Check the area of your repair for unsoldered or poorly soldered connections.

Check the entire board surface for solder splashes and bridges.

2. Check the interboard wiring to ensure that no wires are "pinched" or touching

high-wattage resistors.

3. Check that all control knobs, shields, covers, ground straps, and mounting

hardware have been replaced. Be absolutely certain that you have replaced

all the insulators.

4. Look for unauthorized replacement parts, particularly transistors, that were

installed during a previous repair. Point them out to the customer and

recommend their replacement.

5. Look for parts which, though functioning, show obvious signs of deterioration.

Point them out to the customer and recommend their replacement.

6. Check the line cords for cracks and abrasion. Recommend the replacement

of any such line cord 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.

KDL-32EX707/40EX707/46EX707/52EX707

To Exposed Metal

Parts on Set

0.15 µF

Earth Ground

Figure A. Using an AC voltmeter to check AC leakage.

Voltmeter

(0.75V)