Sharp 27DV-S100 Service Manual page 61

Cassette tape failure to come in
or unexpected ejection.
Push in the cassette tape. Does
NO
the start sensor (Q7001(C))
shift from "H" to "L" level?
YES
NO
Push in the cassette tape. Does
the loading motor start?
YES
Push in the cassette tape. Are
NO
both the start sensor and end
sensor at "H" level?
YES
Check the setup of relay gear
and master cam. Check the
cassette controller for
misalignment.
FLOW CHART No. 2-2
No tape travel in FF/REW
mode.
Check the performance of the
cassette controller's double-
acting rack. Check also the
Are both the start sensor and
start sensor (Q7001) and
end sensor at "H" level?
cassette LED (D7001).
Replace as required.
Push in the cassette tape and
Go to Flowchart No. 5
immediately press the FF key.
"Loading motor failure to
Is the remaining tape fast-
start".
forwarded at "PB" position?
Press the FF/REW key after
Check the start sensor
the above FF action. Does the
(Q7001) and end sensor
loading motor start?
(Q7002). Replace as required.
Does the master cam shift to
"FF" position? (See Mechanism
Operation Flowchart.)
Is the drum motor running?
Is there the H.SW.P. output
signal?
Is the capstan motor running?
Is the reel running with the idler
in mesh with the reel stand?
Are there the supply and take-
up reel pulse input signals at
pins (2) and (3) of IC2001?
Cassette tape assumed to be
defective.
NO
Check the start sensor (Q7001)
and end sensor (Q7002).
YES
NO
YES
NO
Go to Flowchart No. 5 "Loading
motor failure to start".
YES
Are there the specified
NO
mechanism position input
signals at pins (6) and (7) of
IC2001?
YES
YES
Check IC2001 and replace as
required.
NO
Go to Flowchart No. 6 "Drum
motor failure to start".
YES
NO
Go to Flowchart No. 10 "No
H.SW.P. output signal".
YES
Go to Flowchart No. 8
NO
"Capstan motor failure to
start".
YES
NO
Replace the idler assembly.
YES
Go to Flowchart No. 11 "No
NO
supply and take-up reel pulse
output".
YES
FLOW CHART No. 2-3
Check the setup of
master cam and relay
NO
gear. Check also the
mechanism position
sensors (D7008 and
D7009). Replace as
required.