Before Repair And Adjustment; Caution For Fuse Replacement; Protection Circuitry; Safety Part Information - Panasonic RX-D50EE Service Manual

1.2.

Before Repair and Adjustment

Caution : 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, 50Hz in TUNER mode at volume (min) should be (~300 mA).
1.3.

Caution For Fuse Replacement

1.4.

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.
1.5.

Safety Part Information

Safety Parts List:
There are special components used in this equipment which are important for safety.
These parts are marked by
critical parts should be replaced with manufacturer's specified parts to prevent shock, fire or other hazards. Do not modify the
original design without permission of manufacturer.
Safety Ref. No.
14
401
A2
A3
PCB3
L5901
T5903
Z5902
F5901
F5902
FP4100
FP5903
JK5901
ZA5901
ZA5902
ZA5903
ZA5904
in the Schematic Diagrams, Exploded View & Replacement Parts List. It is essential that these
Part No.
RKHN0005A-H HANDLE
RD-DAPX001-V TRAVERSE UNIT
K2CQ2CA00007 AC CORD
RQTX1037-R O/I BOOK (Ru/Ur)
REPNT0063E POWER P.C.B
ELF15N035AN LINE FILTER
G4C4BAH00002 TRANSFORMER
ERZVA5Z471 ZNR SURGE
K5D202BLA013 FUSE
K5D162BLA013 FUSE
K5G502A00039 FUSE PROTECTOR
K5G502A00039 FUSE PROTECTOR
K2AA2B000014 AC INLET
K3GE1ZZ00001 FUSE HOLDER
K3GE1ZZ00001 FUSE HOLDER
K3GE1ZZ00001 FUSE HOLDER
K3GE1ZZ00001 FUSE HOLDER
Table 1
Part Name & Description
4
Remarks
(RTL)