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8-2.
VIDEO CIRCUIT ADJUSTMENTS
AGC LEVEL Adjustment
Measurement point |
Measurement equipment
Adjustment element
Adjustment Method
1)
Adjust VR102
so that the level is 1.00 +0.05Vp-p.
—
alt diy
THM
DEVIATION, CARRIER SET Adjustment
Signal
Signal
Specified value
ath Ny
NTSC Color bar
Measurement point
TP103
Measurement equipment | Spectrum analyzer
Adjustment element
VR103 (carrier)
VR104 (deviation)
Specified value
3.80 + 0.05MHz (carrier frequency)
1.00 + 0.0S5MHz (deviation)
Adjustment Method
1) Adjust the carrier frequency to 3.80 + 0.05MHz and
the deviation to 1.00 + 0.05MHz in color bar input
E-E state.
Sync tip
100%
White
+——
1MHz
DEVIATION
/ni ov"
3.45MHz
CARRIER
Note : The 100% white frequency must be within 4.80 = 0.05MHz,
in this case.
PB LEVEL Adjustment
a
Adjustment Method
1)
Terminate VIDEO OUTPUT
terminal with a 75 ohms.
2)
Adjust
VR101
so that the level is 1.00+0.05Vp-p.
.
WHY
DOC LEVEL (N. C.) Adjustment
Signal
@ Alignment tape MH-1
(or self-recording playback)
© Alignment tape NX-S704M
Measurement point
ORO UM Ol
:
® VIDEO OUT (TP101)
Adjustment element
— |
VR105
Adjustment Method @
1) Holding IC101@pin in CH1, IC101@pin in CH2, one
of the channels is inverted in the same range, using
in the add mode.
2)
Adjust
VR105
so
that
the
waveform
becomes
minimum.
;
-++ ADD mode
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aie thy
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— 148 —
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