Read Panasonic SA-PM24EB / SA-PM24EG / SA-PM24EP / SC-PM24EP Service Manual online
5
1.3.
Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C5901, C900, C909, C5909, C5917 & C5121 through a 10
Ω, 1W resis-
tor 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.
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 220-240 V, 50 Hz in NO SIGNAL mode should be ~250 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.
• 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:
"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.
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.
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.
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
401
RAEX0190Z-V
TRAVERSE UNIT
22
RFKHAPM24EBK
REAR CABINET ASS’Y
EB
22
RFKHAPM24EGK
REAR CABINET ASS’Y
EG
22
RFKHAPM24EPK
REAR CABINET ASS’Y
EP
PCB1
REPX0709AA
TRANSFORMER P.C.B.
(RTL)
T5901
G4CYAYY00213
MAIN TRANSFORMER
T5902
G4C2AAJ00005
BACK-UP TRANSFORMER
Z5901
ERZVA5Z471
ZNR
RL5901
K6B1AEA00003
RELAY
F5901
K5D102BLA013
FUSE
FP5901
K5G502AA0002
FUSE PROTECTOR
JK5901
K2AA2B000011
AC INLET
L5901
ELF15N035AN
LINE FILTER
A2
K2CZ3YY00005
AC CORD
EB
A2
K2CQ2CA00007
AC CORD
EG/EP
A3
RQTX0179-2D
O/I BOOK (Ge/Fr/It/Sp)
EG
A3
RQTX0180-2H
O/I BOOK (Da/Du/Sw)
EG
A3
RQTX0181-2E
O/I BOOK (Sp)
EP
A3
RQTX0182-2B
O/I BOOK (En)
EP
A3
RQTX0183-2R
O/I BOOK (Ru/Ur)
EP
A3
RQTX0262-2B
O/I BOOK (En)
EB
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