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Note : Unless otherwise noted, a l l test points and adjustments are located on the M A I N board.
Check Point
No.
Item
TP1 1 0
1 4
S mode
E P
F requency
R es ponce
and Balance
1 5
C N R input
TP325
level
C N R
TP324
1 6
NC balance
C N R F B
TP324
1 7
TP324
R30
R303
2 -8
Signal
Adjustment Parts
• S-VHS mode
R30
• EP mode
(S-EP F R EQ
• R EC then PB
R ESPONSE )
• Mu lti-burst
•N mode
R 3 1 4
•SP mode
( C N R I N PUT
• R EC then PB
LEV E L )
• Color bars
• N mode
R303
• SP mode
T302
• PB
(C N R NC
• M H- 1 color bars
BA LANC E )
• E D IT : O F F
• N mode
R302
•PB
(C N R F B )
•MH-1 color bars
• E D IT : O F F
R 3 1 4
TP325
0
0
0
0
o o
0
0 0
0
T302
R302
&
Mode
1 . I n the same manner as above, (Sec. 2 . 4 . 1 3) .
perform adjustment for E P mode.
2. R ecord in the EP mode, then play back and
set 1 00 kHz level to 3-scale on the display
or video
at CH1 waveform.
3. Adj ust R30 so that the 3.58 M H z level
sweeper
becomes 1 .8 to 2 .4-sca le (-3 ± 1 d B ) .
4. Confirm that the level d ifference between
both channels is less than 2 d B .
1 . Observe the TP325 waveform at V rate.
2. Adjust R 3 1 4 so that the color level (A) is
0.27 ± 0.01 Vp-p.
1 . Observe the TP324 waveform at V rate.
2. Adjust R 303 and T302 to minimize the
3.58 MHz level " B ", i.e., so that only the
noise component is observable as shown in
Fig. 2-4-9.
1 . Short TP21 to TP G N D2. Use the control s
o f t h e osci l loscope to expand portion C o f
the�24 waveform a s shown in F i g . 2-4- 1 0 .
. ·2'--Adjust R302 so that the maximum 3.58
M H z ampl itude D and waveform segment
E are re lated as fol l ows
=
D : E
2 : 1 ± 0. 1
Note: Read p-p value of D and noise center of E .
TP1 1 0
TP1 0
Magnified
Description
Fig. 2-4-8
M i n i m u m
F ig. 2-4-9
I H
2H
F ig. 2-4-1 0
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