Sharp VC-ME80HM Service Manual ▷ View online
33
VC-ME80GM
VC-ME80HM
VC-ME80HM
1
0
1
1
1
1
1
0
1
1
1
1
1
0
1
0
1
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
1
0
1
0
0
0
1
0
S sensor
Open
Close
Mode detection inside
sensor A
1
1
1
0
0
0
0
0
0
Mode detection inside
sensor B
0
1
1
0
1
0
1
1
0
CS/EJ
ULD
PU
VSR/RPB
RSL
FSL/STL
PB/VSF
FF/REW
STOP
25
0
–
0.5
20
15
10
– 1 + 8 = + 7
PULSE
+ 1
–
1
5
0
60
120
180
240
300
360
G mechanical timing
Mode check
Cam mark
Mode detection outside
(D705 SW B)
Mode detection inside
(D708 SW A)
CAM SW
0
19.812
°
81
188
236
222
265
282
316
334
10.354
°
12.812
°
CA/END
CS/EJ
UL
PU
VSR
PSL
FSL
PB
FF
STOP
Mode detection outside
Mode detection inside
S sensor
EJ
UL
PU
VSR
RSL
FSL
PB
FF
STP
0
1
1
0
1
1
0
0
0
0
0
1
0
0
1 or 0
Loading motor turns in reverse
direction and master cam
counterclockwise.
CASSETTE INSERTION STOP
Cassette
inserting
Full-
loading
YES
YES
YES
NO
NO
NO
Unloading
Loading motor starts in normal
direction and master cam counter
clockwise.
Does mechanism position sw.
come off within 2.5 sec.?
Are start/end sensors at low level
before cassette insertion ?
Insert cassette.
Double action rack slides.
Drum motor starts.
Tape loading.
Pinch roller comes into contact.
Cam switch is at PB position.
Loading motor stop.
Is drum FG pulse outputted ?
End
End
Cassette is ejected and loading
motor stops.
Start sensor close.
(Cassette is judged
caught halfway.)
(Cassette LED or some other part
is judged defective.)
6.
MECHANISM OPERA
TION FLO
WCHAR
T AND
TR
OUBLESHOO
TING GUIDE
MECHANISM OPERATION FLOWCHART
34
VC-ME80GM
VC-ME80HM
VC-ME80HM
STOP REC/PLAY
PLAY STILL
PLAY VSR
VSR PLAY
Capstan motor turns
counterclockwise.
Is take-up reel sensor signal
outputted ?
End
Press REC/PLAY key.
Picture appears.
Unloading
Set capstan motor to search
speed.
End
Press FF key.
PLAY VSF
REC/PLAY STOP
Capstan motor turns in
reverse direction.
Loading motor turns in
clockwise direction and
master cam counterclockwise.
Slow brake comes into
contact with capstan motor.
Slow brake comes into
contact with capstan motor.
When the cam switch detects
the position of wall opposite to
the FSL position, the loading
motor rotates counterclockwise,
and the master cam rotates
clockwise.
Cam switch is at STILL
position.
End
Capstan motor stops.
Press STOP key.
Loading motor stops.
End
Stop capstan motor.
NO
YES
Press STILL key.
Loading motor turns clockwise
and master cam counterclockwise.
The rack rotates counterclockwise the
Sup reel disk to wind up the tape.
The RSL position is detected, the
capstan motor rotates clockwise
with reverse playback speed to
start the reverse playback.
The VSR position is detected, the
loading motor stops, and the
speed of capstan motor is
increased up to the VSR speed.
Is take-up reel sensor signal
outputted ?
Press REW key.
Cam switch is at FSL position.
The tension arm is set to the
drum side.
Loading motor stops.
Capstan motor stops.
Still picture appears.
The Slow brake moves off
from the capstan motor.
End
Unloading
Cam switch is at PB position.
End
Press PLAY key.
Loading motor turns counter-
clockwise and master cam
clockwise.
Capstan motor turns
counterclockwise. PB speed.
NO
YES
Still picture is obtained.
Loading motor turns clockwise
and master cam counterclockwise.
35
VC-ME80GM
VC-ME80HM
VC-ME80HM
STOP FF/REW
STOP CASSETTE EJECT
FF/REW STOP
NO
NO
FF/REW
operation
Brake
function
Turn capstan motor in
normal or reverse direction,
after the remaining tape has
been detected.
Loading motor turns counter-
clockwise.
Cam switcn is at Stop
position.
End
Press STOP key.
Press FF/REW key.
Stop capstan motor.
Loading motor stops.
End
Loading motor turns in clockwise and master cam
counterclockwise.
4 supply reel pulses
outputted ?
Does the take-up
reel pulse output
two edges?
Capstan motor turns
clockwise.
Loading motor turns
clockwise.
Cam switch is at
EJECT position.
Loading motor
stops.
Capstan motor
stops.
Press EJECT key.
Tape
unloading
Cassette
eject
End
Capstan motor turns
clockwise.
Capstan motor turns
counterclockwise in about
2 seconds.
Stop loading motor.
Capstan motor turns in reverse direction.
Cam switch is at UL position.
YES
YES
VSR STILL
Loading motor turns in
counterclockwise direction
and master cam clockwise.
Slow brake comes into
contact with capstan motor.
When the cam switch detects
the position of wall opposite to
the FSL position, the loading
motor rotates clockwise, and
the master cam rotates
counterclockwise.
The cam switch detects the
RSV position.
End
Capstan motor stops.
Loading motor stops.
Press STILL key.
However, the reverse still screen
remains for 10 seconds, and it
changes to the forward still screen.
The reverse still screen appears.
36
VC-ME80GM
VC-ME80HM
VC-ME80HM
MECHANISM TROUBLESHOOTING
1. FF/REW FAILURE (NO TAPE WINDING)
Press FF key.
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Is master cam at
FF position ?
Does loading
motor operate?
Modes changing
smoothly through
cam switch ?
Loading motor
control system
in trouble.
Are Vco 12V and
Vcc 5V applied ?
Replace the
capstan motor.
Replace the idler
ass’y.
Replace the reel
sensor.
Is voltage applied
to loading motor ?
Loading motor is
damaged. Replace
it.
Voltage supply
system in trouble.
Mode sensor
system in trouble
or master cam
malpositioned.
Voltage supply
system in trouble.
Does capstan
motor turn in FF (or
REW) direction ?
Are idler wheel
ass’y and reel disk
in mesh ?
Is the pulse
outputted from reel
sensor ?
The cassette tape
is presumably
damaged.
2. REC/PLAY FAILURE (MODE RELEASE)
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Is the master cam
at PB position ?
Does loading
motor operate ?
Modes changing
smoothly through
cam switch ?
Loading motor
control system
in trouble.
Are Vco 12V and
Vcc 5V applied ?
Replace the
capstan motor.
Replace the idler
ass’y.
Replace the reel
sensor.
Is voltage applied
to loading motor ?
Loading motor is
damaged. Replace
it.
Voltage supply
system in trouble.
Voltage supply
system in trouble.
Does capstan
motor turn ?
Are idler wheel
ass'y and reel disk
in mesh ?
Is the pulse
outputted from reel
sensor ?
Check main PWB.
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