Before Repair And Adjustment; Protection Circuitry; Safety Part Information - Panasonic SA-AK570PL Servise Manual

SA-AK570PL / SA-AK570GCP
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
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.
18
18
36
51
68
69
74
81
82
340
A2
A2
PCB4
PCB10
PCB13
DZ5701
S5701
L5702
T2900
T5701
T5701
T5751
in the Schematic Diagrams & Replacement Parts List. It is essential that these critical parts should
Part No.
RGRX0070D-A
RGRX0070E-A
RKMX0144-K
RMZ0339
REXX0686
REXX0687
RMVX0119
REZX0024
REZX0023
RAEX0190A-V
K2CB2CB00018
K2CQ2CA00007
REPX0676D
REPX0676E
REPX0676D
REPX0676E
REPX0676E
ERZV10V511CS
K0ABCA000007
ELF22V035B
G4D1A0000117
ETS48AB116AC
ETS48AB12GAC
ETS19AB256AG
Part name & Description
REAR PANEL
REAR PANEL
TOP CABINET
ZNR COVER
VOLTAGE SELECTOR WIRE 1
VOLTAGE SELECTOR WIRE 2
BARRIER COVER
PRIMARY WIRE 2
PRIMARY WIRE 1
TRAVERSE ASSEMBLY UNIT
AC CORD
AC CORD
SMPS P.C.B.
SMPS P.C.B.
AC INLET P.C.B.
AC INLET P.C.B.
VOLTAGE SELECTOR P.C.B.
DIODE
SW VOLTAGE SELECTOR
LINE FILTER
SWITCHING TRANSFORMER
TRANSFORMER
SWITCHING TRANSFORMER
BACKUP SW TRANFORMER
4
Remarks
[M] PL
[M] GCP
[M]
[M] GCP
[M] GCP
[M] GCP
[M] PL
[M] GCP
[M] GCP
[M] (RTL)
[M] PL
[M] GCP
[M] (RTL) PL
[M] (RTL) GCP
[M] (RTL) PL
[M] (RTL) GCP
[M] (RTL) GCP
[M]
[M] GCP
[M]
[M]
[M] GCP
[M] PL
[M]