Electrical Adjustments - Hitachi P42A01 Service Manual

1. ADJUSTMENT PROCEDURE
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
• Use an isolation transformer when performing any
service on this chassis.
• When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
• When you exchange IC and Transistor with a heat sink,
apply silicon grease on the contact section of the heat
sink. Before applying new silicon grease, remove all the
old silicon grease. (Old grease may cause damage to the
IC and Transistor).
Prepare the following measurement tools for electrical
adjustments.
1. Pattern Generator
2. BASIC ADJUSTMENTS
On-Screen Display Adjustment
1. Set the VOLUME to minimum.
2. Press the VOL. DOWN button on the set and the
channel button (9) on the remote control for more than
2 seconds to display adjustment mode on the screen as
shown in Fig. 2-1.
01 H POSI OSD
3. Use the UP/DOWN button or Channel button (0-9) on
the remote control to select the options shown in
Fig. 2-2.
4. Press the MENU button on the remote control to end
the adjustments.
5. To display the adjustment screen for TV, AV, YUV,
HDMI and PC mode, press the INPUT button on the
remote control to set to the TV, AV, YUV, HDM and PC
mode.
6. Press the VOL.DOWN button on the set and the
channel (9) on the remote control for more than 2
seconds.

ELECTRICAL ADJUSTMENTS

TV
FULL
PAL
176
Fig. 2-1
NO. FUNCTION
01 H POSI OSD
02 V POSI OSD
03 R DRIVE (N)
04 R CUT OFF (N)
05 G DRIVE (N)
06 G CUT OFF (N)
07 B DRIVE (N)
08 B CUT OFF (N)
09 R DRIVE (C)
10 R CUT OFF (C)
11 G DRIVE (C)
12 G CUT OFF (C)
13 B DRIVE (C)
14 B CUT OFF (C)
15 R DRIVE (W)
16 R CUT OFF (W)
17 G DRIVE (W)
18 G CUT OFF (W)
19 B DRIVE (W)
20 B CUT OFF (W)
2-1: WHITE BALANCE
1. Place the set in Aging Test for more than 90 minutes.
2. Receive the greyscale pattern from the Pattern
Generator.
3. Press the INPUT button on the remote control to set to
the AV mode.
4. Using the remote control, set the brightness and contrast
to normal position.
5. Activate the adjustment mode display of Fig. 2-1 and
press the channel button (03) on the remote control to
select "R DRIVE (N)".
6. Press the CH. UP/DOWN button on the remote control to
select the "R CUT OFF(N)", "B DRIVE(N)", "B CUT
OFF(N)", "R DRIVE(C)", "R CUT OFF(C)", "B DRIVE(C)",
"B CUT OFF(C)", "R DRIVE(W)", "R CUT OFF(W)", "B
DRIVE(W)" or "B CUT OFF(W)".
7. Adjust the VOL. UP/DOWN button on the remote control
to whiten the R CUT OFF(N), B DRIVE(N), B CUT
OFF(N), R DRIVE(C), R CUT OFF(C)", B DRIVE(C), B
CUT OFF(C), R DRIVE(W), R CUT OFF(W), B
DRIVE(W) and B CUT OFF(W) at each step tone
sections equally.
8. Perform the above adjustments 6 and 7 until the white
colour is achieved.
D-1
NO. FUNCTION
21 H POSI CENTRE
24 V POSI CENTRE
32 BRIGHT CENT
33 BRIGHT MAX
34 BRIGHT MIN
35 TINT
36 SHARP V1 MAX
37 SHARP H1 MAX
38 SHARP H2 MAX
39 CONTRAST CENTRE
40 CONTRAST MAX
41 CONTRAST MIN
42 COLOUR CENT
43 COLOUR MAX
44 COLOUR MIN
45 H POSI TEXT
46 V POSI TEXT
52 TEXT CONTRAST
Fig. 2-2