Sharp VC-MH80 Service Manual page 54

FLOW CHART NO.18 E-E MODE TROUBLESHOOTING
No E-E signal.
I
(Tuner input mode.)
Check IF PWB and partsaround it.
Is there a signal at pin (27) of IC2017
Is the supply voltage of 5V
fed to pins (26) and (54) of
Are there the serial data
and clockat pins (14) and
(Ext. input mode.)
' ES NO
Is there a signal at Ext. input
terminal?
Check between Ext. inputterminal
Check Ext. input terminal and
parts around it.
NO
Check PCSV lines.
YES
Check between pins (14)
NO
way up thru to pins (1) and
(2) of IC701.
Replace IC201.
FLOW CHART NO.19 RECORDMG MODE (LUMINANCE) TROUBLESHOOTING
Recording is not possible. (E-E mode is possible.)
I
NO
NO
connector?
YES
(27) of IC301?
YES
NO
Are there specified recording-
mode signals at pins (5) and (9) of
XC connector?
Check upper and lower drum.
Check parts around pins (38). (39).
(47) and (48) of lC20 1.
Check partsaround pin (50) of
Check R224 (REC FM level control).
YES
Check peripheral circuit of 4282
and Bias CTL 8V line.
Check between pin (10) of AX
connector and all the way up thru
to pin (25) and pin (27) of IC301.
Check BIAS CTL 8V line.