Troubleshooting Guide; No Power; No Sound To Speaker Unit (At Times Or All The Times) - Panasonic SA-PMX70EG Service Manual

7 Troubleshooting Guide

7.1.

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) ?
Yes
Is fuse (F1) on SMPS P.C.B. OK?
Yes
Is AC Power present at H2015 (SMPS) to CN1100 (Main)?
Yes
Replace Main P.C.B.
7.2.

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.
Table2
Is sound waveform output from speaker terminal (CN4200) ?
Yes
Check connection of speaker cables and any damage/breaking with cables
Yes
Replace speaker unit
No
Check AC Cord and AC Inlet & replace them
No
Check & replace Fuse (F1)
Table1
No
Is 15P wire between H2015 (SMPS) to CN1100 (Main)OK ?
Yes
speakers are faulty.)
No
PWM singnal output(Pin28, 31, 36, 39) from D-AMP IC4200 is OK?
Yes
PWM singnal input(Pin6, 8, 16, 18) to D-AMP IC4200 is OK?
Yes
PWM singnal output(Pin27, 28, 29, 30) from D-AMP IC4100 is OK?
Yes
PWM singnal input(Pin4, 5, 8) to D-AMP IC4100 is OK?
Yes
Table1
SMPS H2015 -MAIN CN1100)
Pin No. Voltage Value
Replace 15P wire
Check each component on SMPS P.C.B.
Table 2
Pin No. Waveform Output
No
Replace Main P.C.B.
No
Replace Main P.C.B.
No
Replace Main P.C.B.
No
Replace Main P.C.B.
Check sound input circuit (Tuner/CD/USB/BT P.C.B., etc.)
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