HR-MB3
7 – 1
Audio
HR-MB3
Service Manual
HR-MB3
Market
E
CHAPTER 7.
FLOWCHART
[1] Troubleshooting
Abnormal display
Is 7 V applied to TL700 ?
The LCD panel is defective.
Is voltage applied to pins 1, 8, 14, and 27 of IC301 ?
No
Check soldering of IC301, IC302, D303, D304, R301, R304, R305,
and R342.
Yes
Is waveform sent to pins 3, 4, 5, 6, and 7 of IC301 ?
No
Check peripheral circuits of R308~ER310, R312, R315, R101~
ER102, and R132~ER135.
No
No
Yes
Yes
Yes
Yes
No
Audio playback circuit
Is waveform sent to TL735 - TL740 and TL743 - TL750 ?
Check soldering of IC405, D407, L405, Q406, R422, R423,
R446, and C426. Check peripheral circuits of IC405.
Check peripheral circuits of IC201, IC500, SC500, IC700, R709,
and the LCD flex PWB.
Recheck
Recheck
No
No
Is waveform sent to TL735 - TL740 and TL743 - TL750?
Check peripheral circuits of IC100.Check peripheral
circuits of IC100.
During playback, playback time display advances but sound is
not heard.
Is waveform sent to pins 3, 4, 5, 6, and 7 of IC301 ?
Check peripheral circuits of IC100.
Is audio waveform sent to TL304 and TL305 ?
Check the headphone jack and headphones.
Check soldering of IC301, R344, R345, C312, C313, R321, R323,
R337, R338, FB300, and FB301.
Summary of Contents for HR-MB3
Page 13: ...HR MB3 5 4 MEMO ...
Page 38: ...HR MB3 8 9 MEMO ...