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Electrical Adjustments - Akai CFTD2052 Service Manual

Lcd color television/dvd video player
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1.
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
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.
Before removing the anode cap, discharge electricity
because it contains high voltage.
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. Oscilloscope
2. AC Voltmeter
3. Pattern Generator
4. Multi-Sound Signal Generator
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 1 second
to appear the adjustment mode on the screen as shown
in Fig. 1-1.
Function
Step No.
3.
Use the Channel UP/DOWN button or Channel button (1-0)
on the remote control to select the options shown in Fig. 1-2.
4.
Press the TV MENU button on the remote control to end the
adjustments.
5.
To display the adjustment screen for AV mode, press the
INPUT SELECT button on the remote control to set to the AV
mode. And, to display the adjustment screen for DVD mode,
press the TV/DVD button on the remote control to set to the
DVD mode. Press the VOL.DOWN button on the set and the
channel (9) on the remote control for more than 1 second.

ELECTRICAL ADJUSTMENTS

01 OSD
TV
2C
NO.
01
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Fig. 1-1
D-1
FUNCTION
NO
.
OSD
38
RCUT M
39
GCUT M
40
BCUT M
41
DRI1 M
42
DRI2 M
43
MD6 M
44
DTHON M
45
DRREF M
46
RCUT2 M
47
GCUT2 M
48
BCUT2 M
49
GAINR M
50
GAING M
51
GAINB M
52
RCUT C
53
GCUT C
54
BCUT C
55
DRI1 C
56
DRI2 C
57
MD6 C
58
DTHON C
59
DRREF C
60
RCUT2 C
61
GCUT2 C
62
BCUT2 C
63
GAINR C
64
GAING C
65
GAINB C
66
RCUT W
67
GCUT W
68
BCUT W
FUNCTION
DRI1 W
DRI2 W
MD6 W
DTHON W
DRREF W
RCUT2 W
GCUT2 W
BCUT2 W
GAINR W
GAING W
GAINB W
BRI CEN
BRI MAX
BRI MIN
CON CEN
CON MAX
CON MIN
COL CEN
COL MAX
COL MIN
TIN CEN
TIN MAX
TIN MIN
SHA CEN
SHA MAX
SHA MIN
DIM
CR GAIN
CB GAIN
CR OFFS
CB OFFS
Fig. 1-2

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