1 Safety Precautions
1.1. General Guidelines
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, ensure that all the protective devices such as insulation barriers and insulation papers shields are properly
installed.
3. After servicing, check for leakage current checks to prevent from being exposed to shock hazards.
1.1.1. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. Using an ohmmeter measure the resistance value, between the jumpered AC plug and each exposed metallic cabinet part on
the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the
chassis, the reading should be between 1M
Ω
and 5.2M
Ω
.
When the exposed metal does not have a return path to the chassis, the reading must be
.
1.1.2. Leakage Current Hot Check (See Figure 1)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a 1.5k
Ω
, 10 watts resistor, in parallel with a 0.15µF capacitor, between each exposed metallic part on the set and a
good earth ground such as a water pipe, as shown in Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of the above measurements.
6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may
be used to make the hot checks, leakage current must not exceed 1/2 milliamp. Should the measurement is out of the limits
specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to
the customer.
Fig. 1
4
SA-AK350E / SA-AK350EB / SA-AK350EG
Содержание SA-AK350E
Страница 9: ...9 SA AK350E SA AK350EB SA AK350EG...
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Страница 21: ...9 4 2 Error Code Table For CD Changer Block 21 SA AK350E SA AK350EB SA AK350EG...
Страница 22: ...22 SA AK350E SA AK350EB SA AK350EG...
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Страница 27: ...10 3 Main Parts Location 27 SA AK350E SA AK350EB SA AK350EG...
Страница 37: ...10 16 2 Replacement of Motor Capstan Belt A Capstan Belt B and Winding Belt 37 SA AK350E SA AK350EB SA AK350EG...
Страница 43: ...12 4 Checking and Repairing of Power P C B 43 SA AK350E SA AK350EB SA AK350EG...
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Страница 49: ...15 3 Main P C B 15 4 Panel P C B 49 SA AK350E SA AK350EB SA AK350EG...
Страница 50: ...15 5 Power P C B Transformer P C B 50 SA AK350E SA AK350EB SA AK350EG...
Страница 51: ...15 6 Waveform Chart 51 SA AK350E SA AK350EB SA AK350EG...
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Страница 82: ...SA AK350E SA AK350EB SA AK350EG 82...
Страница 87: ...23 Exploded Views 23 1 Cabinet Parts Location SA AK350E SA AK350EB SA AK350EG 87...
Страница 88: ...SA AK350E SA AK350EB SA AK350EG 88...
Страница 89: ...23 2 Deck Mechanism Parts Location RAA4403 S SA AK350E SA AK350EB SA AK350EG 89...
Страница 90: ...23 3 Packaging SA AK350E SA AK350EB SA AK350EG 90...