Sharp 27DV-S100

67
27DV-S100 27DV-CS10
Hi-Fi audio recording failure.
NO
NO
YES
NO
YES
YES
YES
NO
NO
NO
Are there the audio output signals at pins (53) and (57) of IC6651?
Hi-Fi audio playback failure.
NO
YES
YES
NO
L-ch
R-ch
Pin (14) Pin (9)
Are the following signals applied to
the terminals of IC6651?
Are 5V and 9V voltages applied at
pins (40) and (58) of IC6651
respectively?
Check the line between pins (38)/(40) of
IC1301 and pins (14)/(9) of IC6651.
Is there the playback envelope output
signal (300mVp-p) at pin (29) of
IC6651?
Replace IC6651.
NO
YES
NO
YES
YES
NO
NO
Is the REC AGC ADJ terminal
voltage (1.7V) at pin (37) of IC6651
as specified?
Is the voltage at pin (29) of IC6651
about 3.7V?
Replace IC6651.
Check the BIAS CTL line.
Are there the record FM output
signals from pin (21) to pin (24) of
IC6651 for CH-1, and from pin (21) to
pin (22) of IC6651 for CH-2?
Is 5V voltage applied at pin (25) of
IC6651?
Check the connectors AH and MZ.
Check the PC5V line.
Replace IC6651.
Is there the A-H.SW.P. input signal at
pin (27) of IC6651?
Check the A-H.SW.P. signal line
between pin (27) of IC6651 and pin
(26) of IC2001.
Check the PC5V and PC9V regulator
circuits.
Check the line between pins
(42)/(43) of IC6651 and pins
(18)/(17) of IC2201.
Is there the sub-carrier input signal
(3.58MHz, about 900mVp-p) at pin
(45) of IC6651?
Are there the serial clock and data
signals at pins (42) and (43) of
IC6651?
Is the voltage at pin (28) of IC6651
at "H" level?
Check the line between the emitter of
Q5501 and pin (45) of IC6651.
FLOW CHART No. 2-17FLOW CHART No. 2-16