Read Panasonic SA-AK270EB / SA-AK270EG Service Manual online
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 230V - 240V, 50 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 500mA.
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.
permission of manufacturer.
Table 1
Reference No.
Part No.
Part name & Description
Remarks
18
RGRX0070C-A
REAR PANEL
[M] EG
18
RGRX0070C-B
REAR PANEL
[M] EB
36
RKMX0144-K
TOP CABINET
[M]
68
REXX0684
PRIMARY WIRE 1 (BLACK)
[M]
69
REXX0685
PRIMARY WIRE 2 (RED)
[M]
360
RAE0165A-V
TRAVERSE ASSEMBLY
[M]
PCB1
REPX0622J
SMPS P.C.B.
[M] (RTL)
A2
K2CQ2CA00006
AC CORD
[M] EG
A2
K2CT3CA00004
AC CORD
[M] EB
DZ5701
ERZV10V511CS
ZENER
[M]
L5001
G0B9R5K00003
LINE FILTER
[M]
L5002
G0B9R5K00004
LINE FILTER
[M]
L5701
ELF15N035AN
LINE FILTER
[M]
L5703
ELF22V020A
LINE FILTER
[M]
T2900
G4D1A0000117
TRANSFORMER
[M]
T5701
ETS42BN1A6AD
MAIN SW TRANSFORMER
[M]
T5751
ETS19AB256AG
BACKUP TRANSFORMER
[M]
PC5701
B3PBA0000402
PHOTO COUPLER
[M]
PC5702
B3PBA0000402
PHOTO COUPLER
[M]
PC5720
B3PBA0000402
PHOTO COUPLER
[M]
PC5799
B3PBA0000402
PHOTO COUPLER
[M]
F1
K5D502BNA005
FUSE
[M]
FP2901
K5G4013A0001
FUSE PROTECTOR
[M]
TH5701
D4CAC8R00002
THERMISTOR
[M]
TH5860
D4CC11040013
THERMISTOR
[M]
P5701
K2AA2B000017
AC INLET
[M]
C5700
F1BAF1020020
1000pF
[M]
C5701
F0CAF334A087
0.33uF
[M]
C5703
F0C2H1040001
0.1uF 500V
[M]
C5704
F1BAF1020020
1000pF
[M]
C5705
F1BAF1020020
1000pF
[M]
C5706
F1BAF1020020
1000pF
[M]
C5707
F1BAF1020020
1000pF
[M]
5
SA-AK270EB / SA-AK270EG
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