JVC TM-H1700G/E Service Manual page 31

DEFLECTION CIRCUIT ADJUSTMENT
There are 2 kind of adjustment for the DEFLECTION circuit, PAL and NTSC. The adjustment using PAL signal is as the standard of all
DEFLECTION adjustment. The "#" mark in the table given below expresses the number of each adjustment item. The screen aspect ratio 4 : 3
at 50Hz (PAL) is regarded as the reference value for all adjustments. The other values obtained in the adjustments using other signals
become the offset values as opposed to the reference values.
Therefore, the adjustments must always be carried out in order of PAL and NTSC. When it does not adjust in this turn, and when
operation which is different by the middle is carried out, it is necessary to readjust from the beginning.
ASPECT RATIO
4:3
16:9
4:3
16:9
Although the procedure is described about the adjustment at the time of inputting a PAL signal into below, please perform adjustment which
inputs an NTSC signal continuously.
However, about each adjustment item of "Vertical center", "Vertical linearity", "16:9 Vertical size" and "Horizontal size and center at the time of
under scan mode", it considers as the adjustment only to a PAL signal, and adjustment with an NTSC signal is not required.
Item Test equipment
H. Center Signal generator
H. Size (Crosshatch pattern)
Adjustment
95%
100%
Side Signal generator
pincushion (Crosshatch pattern)
Adjustment
MODE
SCAN SIZE VERTICAL FREQUENCY
NORMAL SCAN
NORMAL SCAN
UNDER SCAN
UNDER SCAN
Test points
SCREEN SIZE SCREEN SIZE
SCREEN SIZE SCREEN SIZE
95%
100%
PICTURE SIZE PICTURE SIZE
PICTURE SIZE PICTURE SIZE
50Hz(PAL)
60Hz(NTSC)
50Hz(PAL)
60Hz(NTSC)
50Hz(PAL)
60Hz(NTSC)
50Hz(PAL)
60Hz(NTSC)
Adjustment
locations
D01 (H. CENTER) 1. Input a crosshatch pattern signal.
2. Select DEFLECTION BLOCK mode from <BLOCK
D02 (H. SIZE)
SELECT> screen.
[SERVICE MENU]
3. Select D01 item.
4. Adjust D01 to align the picture center with the CRT
center.
5. Adjust D02 to set horizontal size to 95% .
6. Repeat above step 4 and 5 to adjust correctly.
7. Confirm the side pincushion of the four corners in
D07
(E-W PARABOLA)
the screen.
D08
8. If not optimum, adjust the D07 and D08 to become
(E-W CORNER)
correctly.
[SERVICE MENU]
No. 51922
TM-H1700G
DISPLAY
D0＃ ＃ ＃ ＃
DA＃ ＃ ＃ ＃
DB＃ ＃ ＃ ＃
DC＃ ＃ ＃ ＃
DD＃ ＃ ＃ ＃
DE＃ ＃ ＃ ＃
DB#, DD#, DF＃ ＃ ＃ ＃
DC#, DE#, DG＃ ＃ ＃ ＃
Adjustment procedure
31