Connect 38.9 MHz test pattern for PAL B/G, PAL-SECAM B/G, 39.5 MHz test pattern for PAL I or 45.75 MHz
test pattern for
PAL M/N, NTSC M model to Z401 SAW filter input terminals. Change the IF-PLL Negative parameter until you
see IN, DOWN below. If you cannot catch IN, DOWN position this way, using a screwdriver rotate the VIF-COIL
LT401 left or right until you
see IN, DOWN.
ADJUST 04
= IF-PLL Negative
IF-PLL POSITIVE ADJUSTMENT (Only with PLL tuner):
Connect 33.9 MHz test pattern for SECAM L’ model to Z401 SAW filter input terminals. Change the IF-PLL
Positive parameter
until you see IN, DOWN below. If you cannot catch IN, DOWN position this way, using a screwdriver rotate the
VIF-COIL LT401
left or right until you see IN, DOWN.
ADJUST 05
= IF-PLL Positive
LUMINANCE DELAY ADJUSTMENT (with only TDA 8844 video processor):
ADJUST 06
= Y-Delay PAL
Enter a PAL B/G colour and black-white bar test pattern via RF. Adjust Y-Delay PAL till the colour transients on
the colour bar of
the pattern become as sharper and colours between transients do not mix with each other as possible.
Note:
If the SAW filter is one of the G1965M, J1951M, J3950M, K2958M, K2962M, G3957M, K6256K,
K6259K or M1963M, there is constant group delay distortion, so for an equal delay of the luminance and
chrominance signal the delay must be set at a
value of 160nS. This means the adjustment must be set to the maximum value.
ADJUST 07
= Y-Delay SECAM
Enter a SECAM B/G colour and black-white bar test pattern via RF. Adjust Y-Delay SECAM till the colour
transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each
other as possible.
Note:
If the SAW filter is one of the G1965M, K2958M, K2962M, G3957M, K6256K or K6259K, there is
constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be
set at a value of 160nS.
This means the adjustment must be set to the maximum value.
ADJUST 08
= Y-Delay NTSC
Enter an NTSC colour and black-white bar test pattern via RF. Adjust Y-Delay NTSC till the colour transients on
the colour bar
of the pattern become as sharper and colours between transients do not mix with each other as possible.
Note:
If the SAW filter is M1963M, there is constant group delay distortion, so for an equal delay of the
luminance and chrominance signal the delay must be set at a value of 160nS. This means the adjustment must be
set to the maximum value.
ADJUST 09
= Y-Delay Other
In case of other colour systems, enter this system with colour and black-white bar test pattern via RF. Adjust Y-
Delay Other till the colour transients on the colour bar of the pattern become as sharper and colours between
transients do not mix with each other
as possible. Normally for an equal delay of the luminance and chrominance signal the delay must be set at a value
of 160nS.
This means the adjustment must be set to the maximum value.
VERTICAL ZOOM ADJUSTMENT (only for 110ø picture tubes):
ADJUST 10
= Vertical Zoom
Enter a PAL B/G circle test pattern via RF. Change vertical zoom till you see the upper and lower limit of the
circle as close to the upper and lower limit of the picture tube as possible.
VERTICAL SCROLL ADJUSTMENT (only for 110ø picture tubes):
ADJUST 11
= Vertical Scroll
Enter a PAL B/G circle test pattern via RF. Change vertical scroll till you see the circle exactly in the middle of the
screen.
4:3 HORIZONTAL SHIFT ADJUSTMENT:
ADJUST 12
= 4 : 3 Horizontal Shift
Enter a RED PURITY test pattern via RF. Change horizontal shift till the picture is horizontally centred. Check
whether this adjustment is correct after completing Service Mode Adjustment.
4:3 VERTICAL SLOPE ADJUSTMENT:
ADJUST 13
= 4 : 3 Vertical Slope
