Protection Circuitry - Technics SA-EH770 Service Manual

2. Before turning the power supply on, after completion of repair, slowly apply the
primary voltage by using a power supply voltage controller to make sure that the
consumed current at 50 Hz in NO SIGNAL mode should be shown below with
respectto supply voltage 110/240 V.

2. Protection Circuitry

The protection circuitry may have operated if either of the following conditions is
noticed:
-
No sound is heard when the power is switched ON.
-
Sound stops during a performance.
The functions 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 this unit are used.
If this occurs, follow the procedures outlined below.
1. Switch OFF the power.
2. Determine the cause of the problem and correct it.
3. Switch ON the power once again.
Note:
When the protection circuitry functions, the unit will not operate unless the power
is first switched OFF and then ON again.
3. Accessories
-
AC power supply cord for (GC) area
(RJA0019-1X)................................1 pc.
Power supply
voltage
Consumed current
50 Hz
3
AC 110 V AC 240 V
200 ~ 700 100 ~ 350
mA mA