Troubleshooting Guide - Panasonic SA-PM250EB Service Manual

7 Troubleshooting Guide

No Power
No power during power-on of the unit
Confirmation if AC Power from SMPS P.C.B. to Main P.C.B.
Is AC Power present at the AC Inlet (P5701) ?
Is fuse (F1700) on SMPS P.C.B. OK?
Is AC Power present at P1700 (SMPS) to CN1100 (Main)?
Replace Main P.C.B.
No Sound to speaker unit at times or all the times
Switch between L and R speaker. If no sound continues, speakers are faulty.
No Sound from speaker unit
Check value of resistance for speakers. (if it is
Check main unit or speaker is faulty.
Is sound waveform output from speaker terminal (CN400) ?
Check connection of speaker cables and any damage/breaking with cables
Replace speaker unit
Table3 The P.C.B. that could be speculated as the cause of failure by a function
Item No. Function
Bluetooth
USB
CD
Tuner
Remote control
Bass/Treble/Volume control
FL Display
Switches
Speaker
Check AC Cord and AC Inlet & replace them
Check & replace Fuse (F1700)
Table 1
Is 10P wire between P1700 (SMPS) to CN1100(Main) OK ?
Table 2
speakers are faulty.)
Table 2
PWM singnal output(Pin25, 30, 31, 36) from DSP/D-AMP IC400 is OK?
PWM singnal input(Pin1, 5, 9, 10) to DSP/D-AMP IC400 is OK?
Table3
P.C.B.
Bluetooth P.C.B./Main P.C.B.
USB P.C.B.(Components)/Main P.C.B.
CD Interface P.C.B.(Components)/Main P.C.B.
Tuner P.C.B.(Components)/Main P.C.B.
IR components/Panel P.C.B.(Components)/Main P.C.B.
Button P.C.B.(Components)/Volume P.C.B.(Components)/Panel P.C.B.(Components)/Main P.C.B.
Panel P.C.B.(Components)/Main P.C.B.
Button P.C.B.(Components)/Volume P.C.B.(Components)/Panel P.C.B.(Components)/Main P.C.B.
Main P.C.B.
Table1
SMPS P1700 -MAIN CN1100)
Pin No. Voltage Value
Replace 10P wire
Check each component on SMPS P.C.B.
Pin No. Waveform Output
Replace Main P.C.B.
Replace Main P.C.B.
Check sound input circuit (Tuner/CD/USB/BT P.C.B., etc.)
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