10°C).
- Pb free solder will tend to splash when heated too high (about
1100°F/600°C).
- When soldering or unsoldering, please completely remove all of
the solder on the pins or solder area, and be sure to heat the
soldering points with the Pb free solder until it melts enough.
3. Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C601 ~ C604 through a 10 , 1 W
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 120V, 60Hz in NO SIGNAL mode (volume at min) should be ~1000
mA .
4. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
- No sound is heard when the power is turned on.
- Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and
negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of
the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note :
When the protection circuitry functions, the unit will not operate unless the power is first turned
off and then on again.
5. Connection of the Speaker Cables
- Be sure to connect speaker cables before connecting the AC
power supply cord.
- The load impedance of any speaker used with this unit must be 4 .
- Be sure to connect the cable from the right speaker to the right
terminal and the cable from the left speaker to the left terminal.
1. Strip off the outer covering, and twist the center conductor. Make
sure the bare ends of the wires are not unravelled. (If they are,
twist them tight again.)
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