MECHANICAL ADJUSTMENTS
2-3:
2-2:
When the Tape Running Mechanism does not work well,
adjust the following items.
CONFIRMATION AND ADJUSTMENT OF AUDIO/
CONTROL HEAD
1.
2.
3.
4.
When the height is not correct, turn the screw
3
to
adjust the height. Then, repeat steps 1~3 again.
Playback the VHS Alignment Tape 940-00053
.
(Refer to SERVICING FIXTURE AND TOOLS)
Confirm that the reflected picture of stamp mark is
appears on the tape prior to P4 Post as shown in Fig.
2-2-A.
a)
b)
Turn screw
2
to set the audio level to maximum.
Confirm that the bottom of the Audio/ Control Head and
the bottom of the tape is shown in Fig. 2-2-C.
c)
When the reflected picture is distorted, turn the screw
1
clockwise until the distortion disappears.
When the reflected picture is not distorted, turn the
screw
1
counterclockwise until little distortion
appears, then adjust per "a" above.
Reflected picture of
Stamp Mark
Stamp Mark
Audio/Control Head
P4 Post
Fig. 2-2-A
Audio/Control Head
1
3
2
Fig. 2-2-B
Tape
Audio/Control Head
Fig. 2-2-C
0.25
±
0.05mm
TAPE RUNNING ADJUSTMENT
(X VALUE ADJUSTMENT)
Confirm and adjust the height of the Reel Disk.
(Refer to item 1-1)
Confirm and adjust the position of the Tension Post.
(Refer to item 1-2)
Adjust the Guide Roller. (Refer to item 2-1)
Confirm and adjust the Audio/Control Head.
(Refer to item 2-2)
Connect CH-1 of the oscilloscope to TP4001, CH-2 to
TP1002 and CH-3 to HOT side of Audio Out Jack.
Playback the VHS Alignment Tape 940-00556
.
(Refer to SERVICING FIXTURE AND TOOLS)
Press and hold the Tracking-Auto button on the remote
control more than 2 seconds to set tracking to center.
Set the X Value adjustment driver to the
4
of
Fig. 2-2-B. Adjust X value so that the envelope waveform
output becomes maximum. Check if the relation between
Audio and Envelope waveform becomes (1) or (2) of Fig.
2-1-A.
1.
2.
3.
4.
5.
6.
7.
8.
4
2-4: CONFIRM HI-FI AUDIO (Hi-Fi model only)
Connect CH-1 of the oscilloscope to TP4001, CH-2 to
TP1002 and CH-3 to the Hi-Fi Audio Out Jack.
Playback the VHS Alignment Tape 940-00055
.
(Refer to SERVICING FIXTURE AND TOOLS)
Press and hold the Tracking-Auto button on the remote
control more than 2 seconds to set tracking to center.
Press the Tracking Up button each time count number
of steps which the audio output is changed from Hi-Fi
(10KHz) to MONO (6KHz).
Press the Tracking Down button each time count number
of steps which the audio output is changed from Hi-Fi
(10KHz) to MONO (6KHz).
Confirm that the difference between these counted steps
number in the above items are within 2 steps. If the
difference are more than 3 steps, do Tape Running
Adjustment again. (Repeat step 2-3 again)
1.
2.
3.
4.
5.
6.
CM152
2-23
SERVICI
NG