Pinp Adjustment; Y Amplitude; Mts Adjustment; Input Level Adjustment - Hitachi 36UX59B Service Manual

MSLXU
4-2 PinP ADJUSTMENT
4-2-l Color amplitude
Adiustment Preparation
(1) Input red pattern signal to Video:l.
0.15v
(21 IRE
(2)
(3)
(4)
Turn CTV set ON.
Select PinP adjustment code, "P19."
Connect oscilloscope to pin @ of PIPA connec-
tor base.
4-3 MTS ADJUSTMENT
4-3-l Input Level Adjustment
Adjustment Preoaration
(1) Apply a signal to F/E Ul 01. IF output terminals
of Main PWB using the circuit shown below. And
connect the AGC terminal @ of UlOl to GND
with a lOOn resistor.
Note : Video signal and Audio Signal
should be synchronized.
IF modulator
(sonoutput)
Adiustment Procedure
(1) Change data of "P19" so that the amplitude of
main and sub signal level are the same.
SYNC
IN
lp=4575MHz
fs=41,25MHz
Main
4-2 Y amplitude
Adiustment Preparation
(1) Input 5 step signal to Video:l.
Max.
T
100 IRE
f
40 IRE
(2) After adjustment of color amplitude, connect oscillo-
scope to pin @I of PIPA connector base.
(3) Select PinP adjustment code "P18."
Adiustment Procedure
(1) Change data so that the amplitude of main and sub
signal white peak level are the same.
Main
$ Sub
IF modulator output signal waveform
(Color bar or all white)
IF modulator output level and P/S
P=105dBu (509 termination)
S level; -3dB to P level
At this time, S/N ratio of F/E
video output is 45dB or less.
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