1.3. Before repair and adjustment
Disconnect AC power, discharge AC Capacitors C5700, C5701, C5703, C5704, C5705 (PL Only); C5700, C5701, C5703, C5704,
C5705, C5706 and C5707 (GCP Only) through a 10Ω, 5W 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 120V, 60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 500mA (For PL only).
Current consumption at AC 110V~127V, 50/60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 750mA (For GCP
only).
Current consumption at AC 220V~240V, 50/60 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 500mA (For GCP
only).
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 & 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
18 RGRX0070D-A REAR PANEL [M] PL
18 RGRX0070E-A REAR PANEL [M] GCP
36 RKMX0144-K TOP CABINET [M]
51 RMZ0339 ZNR COVER [M] GCP
68 REXX0686 VOLTAGE SELECTOR WIRE 1 [M] GCP
69 REXX0687 VOLTAGE SELECTOR WIRE 2 [M] GCP
74 RMVX0119 BARRIER COVER [M] PL
81 REZX0024 PRIMARY WIRE 2 [M] GCP
82 REZX0023 PRIMARY WIRE 1 [M] GCP
340 RAEX0190A-V TRAVERSE ASSEMBLY UNIT [M] (RTL)
A2 K2CB2CB00018 AC CORD [M] PL
A2 K2CQ2CA00007 AC CORD [M] GCP
PCB4 REPX0676D SMPS P.C.B. [M] (RTL) PL
REPX0676E SMPS P.C.B. [M] (RTL) GCP
PCB10 REPX0676D AC INLET P.C.B. [M] (RTL) PL
REPX0676E AC INLET P.C.B. [M] (RTL) GCP
PCB13 REPX0676E VOLTAGE SELECTOR P.C.B. [M] (RTL) GCP
DZ5701 ERZV10V511CS DIODE [M]
S5701 K0ABCA000007 SW VOLTAGE SELECTOR [M] GCP
L5702 ELF22V035B LINE FILTER [M]
T2900 G4D1A0000117 SWITCHING TRANSFORMER [M]
T5701 ETS48AB116AC TRANSFORMER [M] GCP
T5701 ETS48AB12GAC SWITCHING TRANSFORMER [M] PL
T5751 ETS19AB256AG BACKUP SW TRANFORMER [M]
4