5
1.2. Before Repair and Adjustment
Disconnect AC power, discharge unit AC Capacitors as such C5700, C5701, C5702, C5706, C5708 and C5709 through a 10W, 1W
resistor to ground.
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 120V, at 60Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should be ~200 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
20 RGNX1045T-K NAME PLATE LABEL
55 RYKX1026J-K REAR CABINET UNIT
401 RAE0165T-V TRAVERSE UNIT ASS’Y
A2 K2CB2CB00021 AC CORD
A3 RQTX1217-C OI BOOK (En/Cf)
PCB10 REPX0820HA SMPS P.C.B (RTL)
DZ5701 ERZVA5Z471 ZNR
L5701 G0B453G00003 FILTER
T1000 G4D1A0000117 SWTCHING TRANSFORMER
T5701 ETS28BH156AC TRANSFORMER
T5751 ETS19AB221AG SUB TRANSFORMER
PC5720 B3PBA0000402 PHOTO COUPLER
RY5701 K6B1AEA00003 RELAY
F1 K5D302AQ0003 FUSE
FP1000 K5H7512A0010 PROTECTOR
TH5701 D4CC11040013 THERMISTOR
TH5702 D4CAA5R10001 THERMISTOR
P5701 K2AB2B000007 AC INLET
C5700 F1BAF1020020 1000pF
C5701 ECQU2A334MLA 0.33uF
C5702 ECQU2A104MLC 0.1uF
C5706 F1BAF1020020 1000pF
C5708 F1BAF1020020 1000pF
C5709 F1BAF1020020 1000pF
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