ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL2. BASIC ADJUSTMENTS
ADJUSTMENTS2-1: CONSTANT VOLTAGE
Read and perform these adjustments when repairing the1.Set condition is AV MODE without signal.
circuits or replacing electrical parts or PCB assemblies.2.Connect the digital voltmeter to TP002.
3.Adjust the VR502 until the digital voltmeter is 115 ? 1V.
CAUTION
YUse an isolation transformer when performing any2-2: RF AGC
service on this chassis.
1.Place the set with Aging Test for more than 15 minutes.
YBefore removing the anode cap, discharge electricity
2.Receive the VHF HIGH (63dB).
because it contains high voltage.
3.Connect the digital voltmeter between the pin 5 of
YWhen removing a PCB or related component, after
CP101 and the GND.
unfastening or changing a wire, be sure to put the wire
4.Activate the adjustment mode display of Fig. 1-1 and
back in its original position.
press the channel button (02) on the remote control to
YWhen you exchange IC and Transistor for a heat sink,
select "RF.AGC".
apply the silicon grease on the contact section of the
5.Press the VOL. UP/DOWN button on the remote
heat sink. Before applying new silicon grease, remove all
control until the digital voltmeter is 2.5 ? 0.05V.
the old silicon grease. (Old grease may cause damages
to the IC and Transistor).
2-3: CUT OFF
Prepare the following measurement tools for electrical1.Adjust the unit to the following settings.
adjustments.G. DRIVE =64, B. DRIVE=64, R. BIAS=64, G. BIAS=64,
B. BIAS=64.
1. Oscilloscope
2.Place the set with Aging Test for more than 15 minutes.
2. Digital Voltmeter
3.Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
On-Screen Display Adjustment
select "CUT OFF".
1. In the condition of NO indication on the screen.4.Adjust the Screen Volume until a dim raster is obtained.
Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control for more than2-4: WHITE BALANCE
1 second to appear the adjustment mode on the screen
NOTE: Adjust after performing CUT OFF adjustment.
as shown in Fig. 1-1.
1.Place the set with Aging Test for more than 10 minutes.
2.Receive the gray scale pattern from the Pattern
Generator.
TV
3.Using the remote control, set the brightness and
contrast to normal position.
4.Activate the adjustment mode display of Fig. 1-1 and
press the channel button (13) on the remote control to
select "R.BIAS".
00 OSD 155.Press the CH. UP/DOWN button on the remote control
to select the "R.BIAS", "G.BIAS", "B.BIAS", "B DRIVE"
Fig. 1-1
or "G DRIVE".
2. Use the Channel UP/DOWN button or Channel button6.Adjust the VOL. UP/DOWN button on the remote control
(0-9) on the remote control to select the options shownto whiten the R.BIAS, G.BIAS, B.BIAS, B DRIVE, and G
in Fig. 1-2.DRIVE at each step tone sections equally.
3. Press the MENU button on the remote control to end7.Perform the above adjustments 5 and 6 until the white
the adjustments.color is looked like a white.
NO. FUNCTIONNO. FUNCTION2-5: FOCUS
00OSD H21BRI.MAX
01CUT OFF22BRI.MIN1.Receive the monoscope pattern.
02RF.AGC23COL.MAX2.Turn the Focus Volume fully counterclockwise once.
03---24COL.CENT
3.Adjust the Focus Volume until picture is distinct.
04H.POSI25COL.MIN
05V.POSI26TINT
06H.SIZE27SHARPNESS2-6: HORIZONTAL POSITION
07V.SIZE28RGB CONTRAST
08V.CENT29PARABORA1.Receive the monoscope pattern.
09V.LIN30TRAPEZIU2.Using the remote control, set the brightness and
10VS CORR31COR TOP
contrast to normal position.
11G.DRV32COR BTM
12B.DRV33V EHT3.Activate the adjustment mode display of Fig. 1-1 and
13R.BIAS34H EHTpress the channel button (04) on the remote control to
14G.BIAS35FM.LVLselect "H.POSI".
15B.BIAS36LEVEL
4.Press the VOL. UP/DOWN button on the remote control
16BRI.CENT37SEP 1
17SUB CONT38SEP 2until the SHIFT quantity of the OVER SCAN on right
18CONT.MAX39T.STEand left becomes minimum.
19CONT.CENT40X-RAY
20CONT.MIN88READ DATA
Fig. 1-2 |
ACEC
