(This “Safety Precaution” is applied only in U.S.A.)
2 Safety Precautions
2.1. 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, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
1. Before servicing, unplug the power cord to prevent an electric shock.
2. When replacing parts, use only manufacturer’s recommended components for safety.
3. Check the condition of the power cord. Replace if wear or damage is evident.
4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent the
customer from being exposed to a shock hazard.
2.1.1.
LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. Measure the resistance value, with an ohmmeter, 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 5.2
Ω
.
When the exposed metal does not have a return path to the chassis, the reading must be
.
2.1.2.
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 capacitors, 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. In case a measurement is outside 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.
Figure. 1
2.2. Before Repair and Adjustment (Digital Receiver SB-FX85)
This model uses switching mode power supply (SMPS) module to provide the necessary voltages for the receiver (SB-FX85)
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 120V, 60Hz in NO SIGNAL mode (at volume minimum) should be ~180 mA.
4
SH-FX85P / SH-FX85PC
Содержание SH-FX85P
Страница 12: ...7 4 Digital Receiver Operations as stand alone audio amplifier SB FX85 12 SH FX85P SH FX85PC ...
Страница 39: ...11 2 Checking of D Amp and D Port P C B 39 SH FX85P SH FX85PC ...
Страница 41: ...12 1 3 PANEL P C B 4GH 0Q 1 2 56 0 5 2 2 2 0 2 2 0 2 3 3 3 3 3 41 SH FX85P SH FX85PC ...
Страница 42: ...12 2 Waveform Chart RF TEST POINT PLAY 42 SH FX85P SH FX85PC ...
Страница 44: ...SH FX85P SH FX85PC 44 ...
Страница 48: ...SH FX85P SH FX85PC 48 ...
Страница 50: ...50 SH FX85P SH FX85PC ...
Страница 66: ...SH FX85P SH FX85PC 66 ...
Страница 70: ...70 SH FX85P SH FX85PC ...
Страница 71: ...20 Exploded Views 20 1 Cabinet Parts Location SH FX85P SH FX85PC 71 ...
Страница 72: ...20 2 Packaging SH FX85P SH FX85PC 72 ...
