Sharp VC-MH705HM/LM Service Manual page 30

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FLOW CHART NO.22 Hi-Fi SOUND MODE TROUBLESHOOTING(2)
No HI-FI sound recording(E-E mode is posible).
Check peripheral circuit of IC651 as
shown in table.
L-ch pins (16),(17),(18),(19)
R-ch pins (32),(33),(34),(35)
YES
Is there a REC FM signal outputted
at the IC651 pins(29) to (24) (CH-1)
/pins (21) to (22)(CH-2).
YES
Check AH-MZ harness.
YES
Check or replace the cylinder.
FLOW CHART NO.23 Hi-Fi SOUND MODE TROUBLESHOOTING(3)
No HI-FI sound playback(E-E mode is possible).
Is there playback envelope signal out
putted at pins(29) to (30) of IC651?
YES
Check peripheral circuit of IC651 as
shown in table.
L-ch pins (16),(17),(18),(19)
R-ch pins (32),(33),(34),(35)
YES
Replace IC651.
NO
Replace IC651.
Check PC 5V lines.
NO
Is the supply voltage of 5V fed to pin
NO
(25) of IC651?
YES
Is there "L" level at pin (36) of IC651?
NO
Check the AGC setting resistor R678
and pin (39) of IC651.
Check PC 5V lines.
NO
NO
Is the supply voltage of 5V fed to pin
(25) of IC651?
YES
Is there A-H.SW.P. signal at
YES
pin (27) of IC651?
NO
Check the A-H.SW.P. line between pin
(27) of IC651 and pin (28) of IC701.
Digitized in Heiloo the Netherlands
NO
6/17/2019
Not for sale!