5
1.4.
Before Repair and Adjustment
Disconnect AC power to discharge unit AC Capacitors as such (C5700, C5701, C5703, C5704, C5705, C5706, C5707) through a
10
Ω
, 10 W 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~127V / 220V~240V, 50/60 Hz in NO SIGNAL mode volume minimal should be ~ 500 mA.
1.5.
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.
1.6.
Safety Parts 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
Safety
Ref. No.
Part No.
Part Name & Description
Remarks
6
REXX0687-1
BLUE WIRE (VOLT SELECTOR-
SMPS)
13
REZX0024-1
BLACK WIRE (AC-SMPS)
14
REZX0023-1
RED WIRE (AC SMPS)
15
REXX0686-1
WHITE (VOLT SELECTOR-SMPS)
22
RGRX0070ADA
REAR PANEL
41
RKMX0144A-K
TOP CABINET
340
RAEX0190A-V
TRAVESER ASS’Y (W/O CD SERVO)
A2
K2CQ2CA00007 AC CORD
A3
RQTX0273-M
O/I BOOK (En/Sp)
DZ5701
ERZV10V511CS ZNR
S5701
K0ABCA000007 SW VOLTAGE SELECTOR
L5702
ELF22V035B
LINE FILTER
T2900
G4D1A0000117
SWITCHING TRANSFORMER
T5701
ETS48AB116AC MAIN TRANSFORMER
T5751
ETS19AB256AG SUB TRANSFORMER
PC5701
B3PBA0000402
PHOTO COUPLER
PC5702
B3PBA0000402
PHOTO COUPLER
PC5720
B3PBA0000402
PHOTO COUPLER
PC5799
B3PBA0000402
PHOTO COUPLER
F1
K5D802BNA005 FUSE
FP2901
K5G4013A0001
FUSE PROTECTOR
TH5702
D4CAA2R20001 THERMISTOR
TH5860
D4CC11040013
THERMISTOR
P5701
K2AA2B000017
AC INLET
C5700
F1BAF1020020
1000pF
C5701
F0CAF334A087
0.33uF
C5703
F0C2H1040001
0.1uF 500V
C5704
F1BAF1020020
1000pF
C5705
F1BAF1020020
1000pF
C5706
F1BAF1020020
1000pF
C5707
F1BAF1020020
1000pF
PCB8
REPX0714E
SMPS P.C.B.
PCB9
REPX0714E
AC INLET P.C.B.
PCB10
REPX0714E
VOLTAGE SELECTOR P.C.B.
Summary of Contents for SA-AK980PU
Page 15: ...15 5 3 Disc Information ...
Page 27: ...27 6 6 2 Error Code Table For Power Supply ...
Page 28: ...28 7 Troubleshooting Guide 7 1 Jupiter USB ...
Page 29: ...29 7 2 Troubleshooting Guide ...
Page 30: ...30 ...
Page 32: ...32 7 3 2 Troubleshooting Guide ...
Page 38: ...38 ...
Page 39: ...39 9 1 Disassembly Flow Chart ...