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
.
Fig. 1
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.
1.2. Before Use
Be sure to disconnect the mains cord before adjusting the voltage selector.
Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will
be used. (If the power supply in your area is 117V or 120V, set to the “127V” position.)
Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries,
the correct voltage is already set.)
1.3. Before repair and adjustment
Disconnect AC power, discharge Power Capacitors C5101, C5104, C5171, C5172, C5920, C5940 and C5950 through a 10
Ω
, 5W
resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at AC 127 V, at 60 Hz is ~500mA and AC 230-240 V, at 50 Hz is ~350mA in NO SIGNAL mode (volume min
at CD mode).
1.4. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
4
SA-AK340GCP
Summary of Contents for SA-AK340GCP
Page 13: ...8 Operation Procedures 13 SA AK340GCP ...
Page 14: ...14 SA AK340GCP ...
Page 23: ...10 3 Main Parts Location 23 SA AK340GCP ...
Page 40: ...12 2 Checking and Repairing of Transformer P C B 40 SA AK340GCP ...
Page 41: ...12 3 Checking and Repairing of Panel Deck Deck Mechanism P C B 41 SA AK340GCP ...
Page 42: ...12 4 Checking and Repairing of Power P C B 42 SA AK340GCP ...
Page 47: ...47 SA AK340GCP ...
Page 48: ...14 2 Power P C B and Transformer P C B 48 SA AK340GCP ...
Page 49: ...14 3 Waveform Chart 49 SA AK340GCP ...
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Page 87: ...21 Exploded Views 21 1 Cabinet Parts Location SA AK340GCP 87 ...
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Page 89: ...21 2 Deck Mechanism Parts Location RAA4502 S SA AK340GCP 89 ...
Page 90: ...21 3 Packaging SA AK340GCP 90 ...