Before Repairs; Protection Circuitry - Technics SU-V300M2 Manual

properly with distinguishing the unit is sold on and after April
2001 ornot.
When the unit is repaired, refer to the table as shown below and
confirm IC601 and Part No. of operation P.C.B.
SU-V300M2 /
(AD903072C2)
IC601 RSN3502A
Operation RJB1273BB-2
P.C.B.
The time of Before April 2001 On and after
sales

2. Before Repairs

1. Turn off the power supply. Using a 10
both ends of power supply capacitors (C703, C704) in order to
discharge the voltage.
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 230/240 V.
Power supply
voltage
Consumed current
50 Hz

3. 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.
SU-V300M2 /
(AD0104089C2)
RSN3502C
RJB1273BB-3
April 2001
AC 230 V AC 240 V
47 ~ 157 45 ~ 150
mA mA
, 10 W resistor, connect
3