4
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 in the Schematic Diagrams, Exploded View & Replacement Parts List. It is essential that these
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.
Table 1
Safety Ref. No. Part No. Part Name & Description Remarks
14 RKHN0005A-H HANDLE
401 RD-DAPX001-V TRAVERSE UNIT
A2 K2CQ2CA00007 AC CORD
A3 RQTX1037-R O/I BOOK (Ru/Ur)
PCB3 REPNT0063E POWER P.C.B (RTL)
L5901 ELF15N035AN LINE FILTER
T5903 G4C4BAH00002 TRANSFORMER
Z5902 ERZVA5Z471 ZNR SURGE
F5901 K5D202BLA013 FUSE
F5902 K5D162BLA013 FUSE
FP4100 K5G502A00039 FUSE PROTECTOR
FP5903 K5G502A00039 FUSE PROTECTOR
JK5901 K2AA2B000014 AC INLET
ZA5901 K3GE1ZZ00001 FUSE HOLDER
ZA5902 K3GE1ZZ00001 FUSE HOLDER
ZA5903 K3GE1ZZ00001 FUSE HOLDER
ZA5904 K3GE1ZZ00001 FUSE HOLDER
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