4
1.2. Before Repair and Adjustment
Disconnect AC power, discharge unit AC Capacitors as such C702, C710, C725, C727, C728 and C730 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 ~250 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
6 REXX0746-1 RED WIRE (AC INLET-SMPS)
7 REXX0747-1 BLACK WIRE (AC INLET-SMPS)
9 REXX0752-1 BLUE WIRE (AC INLET-SMPS)
30 RGNX0850C-1 NAME PLATE PC
30 RGNX0850H-1 NAME PLATE P
101 REXX0771 WHITE WIRE (JW708)
102 REXX0772 BROWN WIRE (JW707)
300 RAE0165T-V TRAVERSE ASS’Y (RTL)
A2 K2CB2CB00021 AC CORD
A3 RQTX0250-1P O/I BOOK (En)
A3 RQTX0251-1C O/I BOOK (Cf) PC
A3 RQTX0254-1M O/I BOOK (Sp) P
L702 G0B103G00015 LINE FILTER
L703 G0B103G00015 LINE FILTER
L751 ELF15N035AN LINE FILTER
T581 G4D1A0000117 MAIN TRANSFORMER
T701 G4DYA0000139 SUB TRANSFORMER
T751 ETS19AB221AG SWITCHING TRANSFORMER
Z752 ERZVA5Z471 ZNR
PC701 B3PBA0000454 PHOTO COUPLER
PC751 B3PBA0000454 PHOTO COUPLER
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