1.2. Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C2602, C2641, C2642, C5015, C5016, C5110, C5916, C5917 and
C5938 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 230-240 V, at 50 Hz in NO SIGNAL mode (at volume min) should be ~300 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 in the
Schematic Diagrams & 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
Reference No. Part No. Part Name & Description Remarks
A2 K2CJ2DA00008 AC CORD [M]
JK5970 K2AA2B000017 AC INLET [M]
T5900 G4CYAYY00174 POWER TRANSFORMER [M]
T5901 G4CYAYY00137 SUB-TRANSFORMER [M]
F5970 K5D162BLA013 FUSE [M]
L5970 ELF15N035AN LINE FILTER [M]
RL5970 K6B1AEA00003 POWER RELAY [M]
Z5970 ERZVA5Z471 ZENER [M]
FP5920 K5G402AA0002 FUSE PROTECTOR [M]
FP5922 K5G202AA0002 FUSE PROTECTOR [M]
22 RFKHAPMX3GNS REAR CABINET ASS´Y [M]
21 RKMX0142-S TOP CABINET [M]
PCB1 REPX0633A TRANSFORMER P.C.B. [M] (RTL)
301 RAEX0190Z-V TRAVERSE UNIT [M] (RTL)
4
SA-PMX3GN
