Sharp LC-20C2E, Руководство по обслуживанию

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16
LC-20C2E
TROUBLE SHOOTING TABLE
(Continued)
No sound
Check all the settins microprocessor's adjust process menu.
Is the pin 53 of IC2001 in the "L" state?
Is output at pins 26 and 27 of IC901 normal? Is output at pins 1 and 7 of IC903 normal?
Yes Yes
No No No No No
No sound from front speakers
Is output at pins 1 and 7 of IC303 normal?
Yes
Is output at pins 8 and 12 of IC3305 normal?
Yes
Muting effect is on. Check the FSMUTE line.
Check IC901 and their peripheral parts. Check IC903 and their peripheral parts. Check IC303 and their peripheral parts. Check IC3305 and their peripheral parts.
Check front speaker and connection cable.
Yes
Is the pin 53 of IC2001 in the "L" state?
Is output at pins 26 and 27 of IC901 normal? Is output at pins 1 and 7 of IC903 normal?
Yes Yes
No No No No No No
Is output at pins 1 and 7 of IC303 normal?
Yes
Is output at pins 8 and 12 of IC3305 normal?
Yes
Muting effect is on. Check the FSMUTE line.
Check IC901 and their peripheral parts. Check IC903 and their peripheral parts. Check IC303 and their peripheral parts. Check IC3305 and their peripheral parts.
Yes
Is output at Q301 normal?
Check Q301 connection cable.
No sound from headphone
TV sound failure
Is output at pins 37 and 38 of IC901 normal?
Is output at pins 1 and 7 of IC902 normal?
Check IC901 and their peripheral parts. Check IC902 and their peripheral parts.
Yes
No
No
No
No sound from output line
Is output at pin 1 of W7 tuner normal?
Is input at pin 67 of IC901 normal?
Check the tuner and their peripheral parts. Check IC901, MONOS/SIF line and their peripheral parts.
Yes
No