Disney DT1900-P-A, Руководство по обслуживанию

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ELECTRICAL ADJUSTMENTS
D-1
1.
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 (YG6260M) on the contract
section of the heat sink, Before applying new silicon grease,
remove all the old silicon grease. (Old grease may cause
damages to the IC and Transistor.)
2. BASIC ADJUSTMENTS BEFORE MAKING ELECTRICAL
ADJUSTMENTS
1. Oscilloscope
2. Digital Voltmeter
3. Multi-sound Generator
4. Pattern Generator
Prepare the following measurement tools for
electrical adjustments.
•
•
•
•
On-Screen Display Adjustment
In the condition of NO indication on the screen.
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. 1.
Fig. 1-1
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options
shown in Fig. 1-2.
Press the MENU button on the remote control to end
the adjustments. 2.
3.
FUNCTION
OSD H
CUT OFF
RF.AGC
V.VCO
H.VCO
H.PHAS
V.SIZE
V.SFT
R.DRV
B.DRV
R.BIAS
G.BIAS
B.BIAS NO.
00
01
02
03
04
05
06
07
08
09
10
11
12
Fig. 1-2
FUNCTION
BRI. CENT
BRI. MAX
BRI. MIN
CONT. CENT
CONT. MAX
CONT. MIN
COL. CENT
COL. MAX
COL. MIN
TINT
SHARP
FM LVL
T. MONO NO.
13
14
15
16
17
18
19
20
21
22
23
24
28
TV
00 OSD H 30
2-3: CUT OFF
1.
2.
3.
4.
Adjust the unit to the following settings.
R.DRV=10, B.DRV=10, R.BIAS=64, G.BIAS=64,
B.BIAS=64, BRI. CENT=115, CONT MAX=65.
Place the set in Aging Test for more than 15 minutes.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "CUT OFF".
Adjust the Screen Volume until a dim raster is obtained.
2-4: FOCUS
1.
2.
3. Receive the monoscope pattern.
Turn the Focus Volume fully counterclockwise once.
Adjust the Focus Volume until picture is distinct.
2-5: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
Place the set in Aging Test for more than 15 minutes.
Receive the white 100% signal from the Pattern
Generator.
Using the adjustment control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (10) on the remote control to
select "R. BIAS".
Press the CH. UP/DOWN button on the remote control to
select the "R. BIAS", "G. BIAS", "B. BIAS", R. DRV or
"B. DRV".
Adjust the VOL. UP/DOWN button on the remote control
to whiten the R. BIAS, G. BIAS, B. BIAS, R. DRV, and
B. DRV at each step tone sections equally.
Perform the above adjustments 6 and 7 until the white
color is achieved. 1.
2.
3.
4.
5.
6.
7.
2-1: VIF VCO
1.
2.
3.
4.
5.
Place the set in Aging Test for more than 10 minutes.
Receive an 80dB monoscope pattern.
Connect the digital voltmeter between the pin 5 of
CP601 and the GND.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "V. VCO".
Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.5V.
2-2: RF AGC DELAY
Place the set in Aging Test for more than 15 minutes.
Receive an 63dB monoscope pattern.
Connect the digital voltmeter to TP001.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (02) on the remote control to
select "RF AGC".
Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.5V ± 0.05V.
1.
2.
3.
4.
5.