Memorex MVDP1085-BLW Service Manual - Page 5

Safety Checks - problems

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SAFETY CHECKS Important Note!!! Do the following safety checks after servicing this unit. 1. Remove all the externally connected test equipment and wires before testing the unit. 2. Use the safety test circuit as shown below. 3. Plug the power cord or unit to be tested into the test receptacle. 4. Switch the unit being tested to ON or PLAY. 5. Connect external jack/terminal contact VTVM across a 1k resistor in the test circuit. Set the meter to a high (150V AC) scale to avoid meter damage and then touch the points with the test probe. If the meter reading indicates less than 3 volts on all test points, set the meter to a low (3V AC) scale and repeat the test. 6. Any reading greater than 0.2 volt indicates a potential shock hazard. If this occurs, determine the cause of the leakage, correct the problem, and repeat the safety test. TO HOT SIDE OF AC LINE TEST RECEPTACLE PLUG IN POWER CORD OF UNIT UNDER TEST TO GROUND SIDE OF AC LINE (EARTH GROUND) VTVM 1K 20V TEST PROBE SAFETY TEST CIRCUIT 5

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5
SAFETY CHECKS
Important Note!!! Do the following safety checks after servicing this unit.
1.
Remove all the externally connected test equipment and wires before testing the unit.
2.
Use the safety test circuit as shown below.
3.
Plug the power cord or unit to be tested into the test receptacle.
4.
Switch the unit being tested to ON or PLAY.
5.
Connect external jack/terminal contact VTVM across a 1k resistor in the test circuit.
Set the meter to a
high (150V AC) scale to avoid meter damage and then touch the points with the test probe.
If the meter reading indicates less than 3 volts on all test points, set the meter to a low (3V AC) scale
and repeat the test.
6.
Any reading greater than 0.2 volt indicates a potential shock hazard. If this occurs, determine the
cause of the leakage, correct the problem, and repeat the safety test.
TO HOT SIDE
OF AC LINE
TEST
RECEPTACLE
PLUG IN POWER CORD
OF UNIT UNDER TEST
TEST PROBE
VTVM
1K 20V
TO GROUND SIDE
OF AC LINE
(EARTH GROUND)
SAFETY TEST CIRCUIT