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(Shift register
IC 2805 Pins 5, 13,
3. VHS-
White value limiter
14 High,
Black value limiter
Oscilloscope:
CIC 2950-(9)
Trigger: S 7-6
Pins 4, 6, 7, 11, 12
Low)
eHeCan
—
Set the overshoots A and B to the same
amplitude.
Feed in acolour bar | Record (VHS)
test signal.
A
Oscilloscope:
CIC 2870-(15)
—
Trigger: S 7-6
100 %
CVS signal
B
5ps/cm
(Shift register IC
2805 Pins 7, 11 High
Pins 4, 5, 6, 12, 13,
14 Low)
(Shift register IC
2805 Pins 7, 11, 14
High, Pins 4, 5, 6,
12, 13 Low)
Normal play (NP)
Set overshoot A to 80% of the CVS signal.
Set overshoot B to 50% of the CVS signal.
Long play (LP)
Feed in acolourbar
| S-VHS record
test signal.
Oscilloscope:
CIC 2870-(15)
Trigger: S 7-6
4. S-VHS-
White value limiter
Black value limiter
A
100 %
CVS signal
B
Sps/cm
(Shift register IC
2805 Pins 5, 13 High
Pins 4, 6, 7, 11, 12,
14 Low)
(Shift register !C
2805 Pins §, 13, 14
High, Pins 4, 6, 7,
11, 12 Low)
Oscilloscope:
Playback the test
R 2685
Contact S 6-7
cassette
Normal play (NP)
Set overshoot A to 110% of the CVS signal.
Set overshoot B to 70% of the CVS signal.
Long play (LP)
5. Y record current
6. Playback
amplitude
7. Reference voltage
CIC 2850-(36)
101
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