Sharp 27DV-S100 Service Manual page 62

Unexpected clearing out Check the start sensor
of REC/PB mode. (Q7001) and end sensor
(Q7002). Replace as
required. Check also the
cassette tape (for
Are both the start sensor
NO
magnetic substance
and end sensor at "H"
peel-off, for example).
level?
YES
Is the master cam at "PB"
NO
Is the loading motor
position? (See Mechanism
running?
Operation Flowchart.)
YES
Are there the specified
mechanism position
signals at pins (6) and
(7) of IC2001?
Check IC2001 and
replace as required.
NO
Is the drum motor Go to Flowchart No. 6
running? "Drum motor failure to
start".
YES
NO
Go to Flowchart No. 10
Is there the H.SW.P.
"No H.SW.P. output
output signal?
signal".
YES
NO
Go to Flowchart No. 8
Is the capstan motor
"Capstan motor failure
running?
to start".
YES
Is the reel running with the
NO
Replace the idler
idler in mesh with the reel
assembly.
stand?
YES
Go to Flowchart No. 11
"No supply and take-up
reel pulse output".
FLOW CHART No. 2-4
Go to Flowchart No. 5
NO
"Loading motor failure to
start".
YES
Check the setup of relay
NO
gear and master cam.
Check also the
mechanism position
sensors (D7008 and
YES
D7009). Replace as
required.
Loading motor failure to
start.
Are the control signals at
Check pins (91) and (90)
NO
pins (11) and (12) of
of IC2001. Check also the
IC7006 as specified? (See
IC2001 performance.
the table at right.)
Replace as required.
YES
NO
Is PC12V applied at pins
Check the PC12V line.
(9) and (10) of IC7006?
YES
Do the voltages (shown at
NO
right) appear at pins (13)
Replace IC7006.
and (15) of IC7006?
YES
Disconnect the loading
Check the mechanism for
motor connector "AL" and
overload, and the setup
NO
apply external DC voltage
of relay gear, master cam
(about DC8V) to the motor
and shifter. Replace the
terminal. Does the motor
loading motor.
start?
YES
Check the loading motor
connection with pins (13)
and (15) of IC7006.
Drum motor failure to
start.
Are 12V and 5V applied
NO
Check the PC12V and
at pins (21) and (3) of
PC5V lines.
IC7006 respectively?
YES
Does the voltage at pin
Are there the PWM output
(2) of IC7006 become
NO
signals at pins (32) and
about 2.6V in the drum
(34) of IC2001?
motor startup timing?
YES
Check the connection
Check the line between
between connectors AD
pins (32)/(34) of IC2001
and ME. Replace the
and pin (2) of IC7006.
drum motor.
Check IC2001 and
replace as required.
FLOW CHART No. 2-5
Pin (11) Pin (12)
Normal turn
(loading
H L
direction)
Reverse turn H
(unloading L
H : 4.7 V
direction)
L : 0V
Stop H H
Pin (13) Pin (15)
Normal About About
turn
11V 1V
Reverse About About
turn
1V 11V
FLOW CHART No. 2-6
NO
Check IC2001 and
replace as required.
YES