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PVM-20M7MDE
I
VI.
Signal System Adjustment
I
1. Crystal Oscillator Adjustment
Note: This adjustment can be performed until the altanative
specification that color swinging is stopped.
(A) Cry~tal 443
1. Input the PAL color bar signal.
2. Connect a frequency counter
to
TP19
fil
3.EntertheServiceMode~.
4. Fabricate the circuit shown below and connect the circuit to
IC13pin-l.
5. Adjust~until
the frequency counter reading
fulllsthefollowingspecification.
6. Write the
data.
• CRYSTAL 443
Specification: 4.433619:!::20Hz
-:r--121/
~
tolC13(j)plo
1SS133orequlvalent
(Whenconnectingthefourdiodestopin-1,placethefourdiodcs
as close to pin-I as possible, and make the wirings short.)
(B)
Crystal358
I. InputtheNTSCcolorbarsignal.
2. Connect a frequency counter
to
TP19 EQ.
3.EntertheServiceMode(~.
4. Fabricate the circuit shown above and connect the circuit to
IC13pin-l.
5. Adjw.t NTSC
CRYSTAi
until the frequency counter reading
fulfils the following specification.
6. Writethedata.
• CRYSTAL 358
Specification: 3.579545±20Hz
2. PAL Color Decode Adjustment
(A) PAL HUE
1.
Input the PAL special (SP) color bar signal.
2. Connect an oscilloscope probe to TP 16
BL&Y..
3. EntertheServ:iceMode~.
4. AdjustfAL...!::illE. until the B-Y anti-PAL signal waveform
becomes''O".
5. Writethedata
*
Because the signal differs every 1H period. adjust so that
averagevaluebecomes''O".
(B) PALU-PHASE
1.
Input the PAL special (SP) color bar signal
2. Connect an oscilloscope probe to TP15
B.ffi.:Y,
3. Enter the Service Mode (Ucm..Nil....U2).
4. Adjust~until
theR-Y anti-PAL signal waveform
becomes''O".
5. Writethedata
8/8-Y (90°/-90°)
anti-PAL signal
*
Because the signal differs every IH p!riod, adjust so that
averagevaluebecomes"O''.
-36-
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