Hitachi C28W440N, Service Manual

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ADJUST 00 = White Point RED
ADJUST 01 = White Point GREEN
ADJUST 02 = White Point BLUE
These adjustments’ factory settings are 026, 026, 030 respectively.
AGC ADJUSTMENT:
ADJUST 03 = AGC
In order to do AGC adjustment, enter a 60dBmV RF signal level from channel C-12.
Connect a digital voltmeter to pin 1 of the tuner. Change the AGC parameter until you see 3.10 Vdc on voltmeter
display. Check that picture is normal at 90dBmV signal level.
IF-PLL NEGATIVE ADJUSTMENT
ADJUST 04
= IF-PLL Negative
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 Z201 SAW filter input terminals. Change the IF-PLL Negative
parameter until you see IN, DOWN below the Adjustment OSD. This adjustment’s factory setting is 080.
IF-PLL POSITIVE ADJUSTMENT:
ADJUST 05 = IF-PLL Positive
Connect 33.9 MHz test pattern for SECAM L’ model to Z201 SAW filter input terminals. Change the IF-PLL
Positive parameter until you see IN, DOWN below the Adjustment OSD. This adjustment’s factory setting is 080.
LUMINANCE DELAY ADJUSTMENT:
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 sharp as possible and colours between transients do not mix with each other.
This adjustment’s factory setting is 008.
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 sharp as possible and colours between transients do not mix with each
other. This adjustment’s factory setting is 011.
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 sharp aaas possible and colours between transients do not mix with each other.
This adjustment’s factory setting is 012.
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 sharp as possible and colours between
transients do not mix with each other. Normally for an equal delay of the luminance and chrominance
signal the delay must be set at a value of 160nS. This adjustment’s factory setting is 007.
GEOMETRY ADJUSTMENTS:
These adjustments are used to get a proper picture geometry in different picture modes: 4/3, 16/9, Cinema (
Subtitle and Zoom are optional picture modes )
After these adjustments the geometry must be like the ones shown below :
4:3 mode for 4:3 CRTs 16 : 9 mode for 4:3 CRTs