Before Repair And Adjustment; Protection Circuitry; Safety Part Information - Panasonic SA-PM45E Service Manual

1.2.

Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C501, C502, C503, C910, C911, C915 and C923 through a 10Ω, 1W
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 230V, 50 Hz in NO SIGNAL mode (volume min) should be ~150 mA.
1.3.

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.
1.4.

Safety Part Information

Safety Parts List:
There are special components used in this equipment which are important for safety.These parts are marked by
Schematic Diagrams & Replacement Parts List. It is essential that these critical partsshould be replaced with manufacturer's
specified parts to prevent shock, fire or other hazards. Do not modify the original designwithout permission of manufacturer.
Reference No.
A2
F1
JK600
T600
T601
L600
Z600
RL600
FP352
FP601
FP950
Table 1
Part No.
K2CQ2CA00002
K5D631BLA012
K2AA2B000015
G4CYAYY00137
G4CYAYY00139
G0B371HA0005
ERZV10V511CS
K6B1AEA00015
K5G502A00039
K5G502A00039
K5G102AA0002
5
Part Name & Description
AC CORD
FUSE
JK AC INLET
SUB TRANSFORMER
TRANSFORMER
LINE FILTER
ZENER
POWER RELAY
FUSE PROTECTOR
FUSE PROTECTOR
FUSE PROTECTOR
SA-PM45E / SA-PM45EG / SA-PM45EE
in the
Remarks
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]