Before Use; Before Repair And Adjustment; Protection Circuitry; Safety Part Information - Panasonic SA-AK870GCP Service Manual

SA-AK870GCP
1.2.

Before Use

Be sure to disconnect the mains cord before adjusting the voltage selector.
Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will
be used. (If the power supply in your area is 110V or 120V, set to the "127V" position.)
Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries,
the correct voltage is already set.)
1.3.

Before Repair and Adjustment

Disconnect AC power, discharge unit AC Capacitors as such C5700, C5701, C5703, C5704, C5705, C5706 and C5707 through
a 10Ω, 1W 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 110-127V / 220-240V, at 50/60Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should
be ~500 mA.
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
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.
Reference No.
18
A2
P5701
T5701
T5751
F1
L5702
S5701
DZ5701
FP2901
36
PC5701
PC5702
PC5720
PC5799
PCB2
PCB8
PCB11
51
68
69
Part No.
RGRX0070U-A
K2CQ2CA00007
K2AA2B000017
ETS48AB116AC
ETS19AB256AG
K5D802BNA005
ELF22V035B
K0ABCA000007
ERZV10V511CS
K5G4013A0001
RKMX0144-K
B3PBA0000402
B3PBA0000402
B3PBA0000402
B3PBA0000402
REPX0622G
REPX0622G
REPX0622G
RMZ0339
REXX0686
REXX0687
Table 1
Part Name & Description
REAR PANEL
AC CORD
AC INLET
MAIN TRANSFORMER
SUB TRANSFORMER
FUSE
LINE FILTER
SW VOLTAGE SELECTOR
ZENER
FUSE PROTECTOR
TOP CABINET
PHOTO COUPLER
PHOTO COUPLER
PHOTO COUPLER
PHOTO COUPLER
SMPS P.C.B.
AC INLET P.C.B.
VOLTAGE SELECTOR P.C.B.
ZENER COVER
WHITE WIRE (VOLTAGE SELECTOR)
BLUE WIRE (VOLTAGE SELECTOR)
4
in the
Remarks
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M]
[M] (RTL)
[M] (RTL)
[M] (RTL)
[M]
[M]
[M]