4
1.2.
Before Repair and Adjustment
Disconnect AC power, discharge unit AC Capacitors as such C702, C710, C725, C727, C728, C730 and C736 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 110V, at 60Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should be ~250 mA (For GT).
• Current consumption at AC 220V, at 50Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should be ~250 mA (For GK).
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
RGNX0850M-1
NAME PLATE LABEL
GT
30
RGNX0850N-2
NAME PLATE LABEL
GK
101
REXX0771
SECONDARY WIRE (WHITE) ; JW708
102
REXX0772
SECONDARY WIRE (BROWN); JW707
300
RAE0165T-V
TRAVERSE ASS’Y
(RTL)
A2
K2CA2CA00020
AC CORD
GK
A2
K2CA2CA00027
AC CORD
GT
A3
RQTX0312-K
O/I BOOK (Co)
GT
A3
RQTX0313-K
O/I BOOK (Cn)
GK
A7
J0KG00000037
AC CLAMP FILTER
GT
PCB5
REPX0755B
SMPS P.C.B.
(RTL) (GK)
PCB5
REPX0755M
SMPS P.C.B.
(RTL) (GT)
PCB14
REPX0755B
AC IN P.C.B.
(RTL) (GK)
PCB14
REPX0755M
AC IN P.C.B.
(RTL) (GT)
L702
G0B103G00015
LINE FILTER
GT
L702
G0B333E00002
LINE FILTER
GK
L703
G0B103G00015
LINE FILTER
GT
L751
ELF15N035AN
LINE FILTER
Summary of Contents for SC-HC4GK
Page 11: ...11 5 Location of Controls and Components 5 1 Main Unit Key Button Operations ...
Page 12: ...12 5 2 Remote Control Key Button Operations ...
Page 13: ...13 6 Operating Instructions 6 1 Disc and MP3 Information ...
Page 23: ...23 9 2 Type of Screw 9 3 Main Parts Location Diagram ...
Page 132: ...132 FLE0907 ...