Sharp 21YF30, Service Manual

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9
9-1 9-2
21YF30
H-VCO, VIF-VCO & S-TRAP fo ADJUSTMENT
No. Adjustment point Adjustment procedure/conditions Waveform and others
H-VCO ADJ
(I
2 C BUS
CONTROL)
(AUTO &
MANUAL ADJ)
(MANUAL ADJ)
1) In No signal (RASTER) condition.
2) Go to service mode, choose service data V03.
3) Connect oscilloscope to IC801 pin11, adj V03 until
freq become 15.625
±
0.15 KHz
(Auto Adj)
1) In No signal (RASTER) condition.
2) Go to service mode.
3) Choose service data V03, by pressing R/C Auto
(Hex C1) key, OSD will appear “OK” at screen.
4) If appear “NG” pls repeat step 3.
(Manual ADJ)
1) In No signal (RASTER) condition.
2) Go to service mode, choose service data V02.
3) Connect oscilloscope to IC801 pin2, adj V02 until
voltage become 2.5
±
1 V.
(Auto Adj)
1) In No signal (RASTER) condition.
2) Go to service mode, choose service data V02.
3) Press the R/C Auto (Hex C1) key, OSD will appear
“OK” at screen.
4) If appear “NG” pls repeat step 3.
(Manual ADJ)
1) In No signal (RASTER) condition.
2) Go to service mode, choose service data V21.
3) Connect oscilloscope to TP 801, adj V21 until
voltage become Min (below 5 V).
4) After that pls adj service data V20 & V24 same as
“V21”, V22 to “V21-1”, V23 to “V21+2”.
(Auto Adj)
1) In No signal (RASTER) condition.
2) Go to service mode, choose service data V21.
3) Press the R/C Auto (Hex C1) key, OSD will appear
“OK” at screen.
4) If appear “NG” pls repeat step 3.
1
VIF-VCO ADJ
(I
2 C BUS
CONTROL)
(AUTO &
MANUAL ADJ)
2
S-TRAP fo
ADJ
(I
2 C BUS
CONTROL)
(AUTO &
MANUAL ADJ)
3
HORIZONTAL, VERTICAL, DEFLECTION LOOP and FOCUS ADJUSTMENT
No. Adjustment point Adjustment procedure/conditions Waveform and others
H-SHIFT
(I
2
C BUS
CONTROL)
(to be done
after purity
adj)
1
V-SHIFT
(I
2
C BUS
CONTROL)
(to be done
after purity
adj)
2
V-SHIFT
(I
2
C BUS
CONTROL)
(to be done
after purity,
V-shift adj)
3
SUB-
SHARPNESS 4
Focus
5
A B
1) Receive Monoscope Pattern Signal (PAL 50 Hz)
2) Choose the service data V13.
3) Adjust the V13 bus data to have a balance position
to spec of A=B (as attach drawing)
4) If cannot make it to A=B, adjust from the best point
so that B slightly smaller than A.
1) Receive Monoscope Pattern Signal (PAL 50 Hz)
2) Choose the service data V12.
3) Adjust V12 bus data to have a most acceptable
vertical position, the monoscope pattern should
be Balance in vertical position.
1) Receive Monoscope Pattern Signal (PAL 50 Hz)
2) Choose the service data V11.
3) Adjust V11 bus data until the overscan become
10
±
2.5 %
Caution1: Pls aging TV more than 10 minutes
before adjustment.
Caution2: for H-shift & V-shift & V-size adj, after
adj pls switch to Monoscope pattern
signal (NTSC 60 Hz) to confirm all
positions are the same.
1) Confirm Service data V08 is 43.
1) Receive the "Monoscope Pattern" signal.
2) Press R/C to set Picture NORMAL condition.
3) Adjust the focus control to get the best focusing.