Sharp 27DV-CS10, Руководство по обслуживанию, Страница: 64 / 164

64
27D
V
-S100
27D
V
-CS10
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
FLOW CHART No. 2-13 FLOW CHART No. 2-11
FLOW CHART No. 2-12
No supply and take-up
reel pulse output.
Insert a cassette tape and
call the FF or REW mode.
Are pulses coming out of
the supply reel sensor
(D7006) and take-up reel
sensor (D7007)?
Capstan servo
malfunction.
Are there the reference
signals (14MHz) at pins
(37) and (38) of IC2001?
Check X7001, C7007
and C7008 for
malfunction.
Does the drum servo
function?
Go to Flowchart No. 12
"Drum servo
malfunction".
Make recording on a
tape with a well-
adjusted set, and play
back the recording. Is there the playback
control signal at pin (76)
of IC2001 during the play
of the recorded tape?
Are there the record
control signals at pins
(74) and (75) of IC2001
in the REC mode?
Is there the specified
capstan FG signal at
pin (67) of IC2001?
Is there the specified
capstan FG signal at
pin (6) of connector
AC?
Check IC2001 and
replace as required.
Check the line
between pins
(31)/(33) of IC2001
and pin (4) of
connector AC.
Check the line
between pin (6) of
connector AC and pin
(67) of IC2001.
Check the
connection between
connectors AC and
MC. Replace the
capstan motor.
Check the line
between pins (5)/(6)
of connector AA and
pins (74)/(75) of
IC2001.
Check the connection
between connectors
AA and MH. Check the
A/C head for stain,
height, breakage, etc.
Replace as required.
Does the voltage at pin
(4) of connector AC
change according to
the rpm?
Check the connection
between connectors
AC and MC. Replace
the capstan motor.
Check IC2001 and
replace as required.
Are there the record
control signals at pins
(5) and (6) of connector
AA?
Check the connection
between connectors
AA and MH. Check the
A/C head for height,
stain, etc.
Replace the A/C head.
Check the record
control signal line.
Check IC2001 and
replace as required.
Does the duty ratio of
the capstan error
output at pins (31) and
(33) of IC2001 change
according to the rpm
(by gently pressing on
the drum motor)?
Check the lines between
the reel sensors and pins
(3)/(2) of IC2001.
Drum servo malfunction.
Are there the reference
signals (14MHz) at pins
(37) and (38) of IC2001?
Check X7001, C7007 and
C7008 for malfunction.
Is there the composite
sync signal at pin (50) of
IC2001?
Is there the H.SW.P. signal
at TP3302? Go to Flowchart No. 10
"No H.SW.P. output signal".
Does the PC12V line
function?
Check the PC12V line.
Does the duty ratio of the
drum error output at pins
(32) and (34) of IC2001
change according to the
rpm (by gently pressing on
the drum motor)?
Check the connection
between pins (32)/(34) of
IC2001 and pin (2) of
IC7006, as well as the
connection between IC7006
and drum motor. Replace
the drum motor as required.
Does the servo malfunction in
the REC mode alone? (Make
recording and playback. Does
the switching point appear
onscreen and slowly move?)
Check IC2001 and
replace as required.
Check the line
between pin (52) of
IC2201 and pin (50) of
IC2001.
Check the reel sensors for stain
and poor positioning. Check the
clearance between the mechanism
and main PWB. Replace the reel
sensor(s) as required.