Mitsubishi Electric HS-U449 Service Manual page 51

[ Servo circuit ]
1. Playback Switching
Point
Measuring instrument and condition
– – –
Test point – – –
EXT trigger – – –
Measurement
– – –
range
PCB-MAIN (Component side)
TP5B
TP5A
Adjustment purpose Video switch over timing during playback.
Symptom when Switching noise or jitter in the playback picture.
incorrectly adjusted
VCR set up condition
Input signal – – –
Alignment Tape
Using tape
( NS1, stair step )
VCR
Playback
condition
Using Jig – – –
1. Play back an Alignment Tape. (NS1, stair step)
2. Short-circuit TP5A to TP5B.
3. Push the channel up/down buttons at the same
time.
4. Confirm that the values 55 to 75 are displayed on
the fluorescent display after approx 6 seconds.
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