DVR-RT502-S
85
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A
B
E
2-2: CONFIRMATION AND ADJUSTMENT OF
AUDIO/CONTROL HEAD
When the Tape Running Mechanism does not work well,
adjust the following items.
1. Playback the VHS Alignment Tape (
GGV1183
).
(Refer to SERVICING FIXTURE AND TOOLS)
2. Confirm that the reflected picture of stamp mark is
appeared on the tape prior to P4 Post as shown in
Fig. 2-2-A
.
a) When the reflected picture is distorted, turn the screw
1
clockwise until the distortion is disappeared.
b) When the reflected picture is not distorted, turn the
screw
1
counterclockwise until little distortion is
appeared, then adjust the a).
3. Turn the screw
2
to set the audio level to maximum.
4. 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 height is not correct, turn the screw
3
to
adjust the height. Then, adjust the 1~3 again.
2-3: TAPE RUNNING ADJUSTMENT
(X VALUE ADJUSTMENT)
1. Confirm and adjust the height of the Reel Disk.
(
Refer to item 1-1
)
2. Confirm and adjust the position of the Tension Post.
(
Refer to item 1-2
)
3. Adjust the Guide Roller. (
Refer to item 2-1
)
4. Confirm and adjust the Audio/Control Head.
(
Refer to item 2-2
)
5. Connect CH-1 of the oscilloscope to
TP3002
, CH-2 to
TP101
and CH-3 to
HOT side of Audio Out Jack
.
6. Playback the VHS Alignment Tape (
GGV1184
).
(
Refer to SERVICING FIXTURE AND TOOLS
)
7. Press and hold the ATR button on the remote control
more than 2 seconds to set tracking to center.
8. Set the X Value adjustment driver (
GGF1510
) 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. 2-3
.
9. Playback the VHS Alignment Tape (
GGV1185
).
(
Refer to SERVICING FIXTURE AND TOOLS
)
10. Check if the picture is played back correctly.
2-4: CONFIRM HI-FI AUDIO (Hi-Fi model only)
1. Connect CH-1 of the oscilloscope to
TP101
and CH-2 to
the
Hi-Fi Audio Out Jack
.
2. Playback the VHS Alignment Tape (
GGV1183
).
(
Refer to SERVICING FIXTURE AND TOOLS
)
3. Press and hold the ATR button on the remote control
more than 2 seconds to set tracking to center.
4. Press the Tracking Up button and count number of steps
which the audio output is changed from Hi-Fi (10KHz) to
MONO (6KHz).
5. Press and hold the ATR button on the remote control
more than 2 seconds to set tracking to center.
6. Press the Tracking Down button and count number of
steps which the audio output is changed from Hi-Fi
(10KHz) to MONO (6KHz).
7. If the difference are more than 3 steps, set the X Value
adjustment driver (
GGF1510
) to
4
of Fig. 2-2-B. Change
the X Value and adjust it so that the value becomes
within 2 steps.
Audio/Control Head
Audio/Control Head
0.25
±
0.05 mm
P4 Cap
Stamp Mark
Reflected picture of
Stamp Mark
Envelope
CH-3
Audio
(1)
(2)
Fig. 2-2-A
Fig. 2-3
Fig. 2-2-B
Fig. 2-2-C
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TEL 13942296513 QQ 376315150 892498299
