Read Sharp XG-PH70X (serv.man4) Service Manual online
XG-PH70X/XG-PH70X-N
4 – 4
Check Audio signal input of PC2.
Go to "Checking the Audio circuit"
Are there signal at C414 output?
Are there signal at C417 output?
Are there signal at C417 output?
NO
Check C414, C417 and their peripheral circuits.
YES
Are there signal at pin (7) of IC402 and IC404?
NO
Check IC402, IC404 and their peripheral circuits.
YES
Are there signal at C445 output?
Are there signal of C447 output?
Are there signal of C447 output?
NO
Check C445, C447 and their peripheral circuits.
YES
CN3001 is not stable or breakdown.
Check Audio output signal.
Go to "Checking the Audio circuit".
Are there signal at C415 output?
Are there signal at C416 output?
Are there signal at C416 output?
NO
Check C415, C416 and their peripheral circuits.
YES
Are there signal at pin (1) of IC401 and IC403?
NO
Check IC401, IC403 and their peripheral circuits.
YES
Are there signal at C446 output?
Are there signal at C448 output?
Are there signal at C448 output?
NO
Check C446, C448 and their peripheral circuits.
YES
CN3001 is not stable or breakdown.
Checking the Main unit.
Check output signal of input1 and 2.
Are there signal at R3045, R3047 and R3049 output?
NO
Check R3045, R3047, R3049 and their peripheral circuits.
YES
Are there signal at pin (2) of FL3006, FL3007 and FL3009
input?
input?
NO
R3045, R3047 and R3049 are breakdown.
YES
Are there signal at pin (1) of FL3006, FL3007 and FL3009 out-
put?
put?
NO
FL3006, FL3007 and FL3009 are breakdown.
YES
CN3001 is not stable or breakdown.
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