ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE2. BASIC ADJUSTMENTS
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.2-1: CUT OFF
CAUTION1.Adjust the unit to the following settings.
R.DRIVE=10, B.DRIVE=10, R.BIAS=64, G.BIAS=64,
YUse an isolation transformer when performing any serviceB.BIAS=64, BRI.CENT=120, CONT.MAX=40.
on this chassis.
YBefore removing the anode cap, discharge electricity2.Place the set with Aging Test for more than 15 minutes.
3.Activate the adjustment mode display of Fig. 1-1 and
because it contains high voltage.
YWhen removing a PCB or related component, afterpress the channel button (01) on the remote control to
unfastening or changing a wire, be sure to put the wireselect "CUT OFF".
4.Adjust the Screen Volume until a dim raster is obtained.
back in its original position.
YWhen you exchange IC and Transistor for a heat sink,
2-2: WHITE BALANCE
apply the silicon grease on the contact section of the heat
sink. Before applying new silicon grease, remove all theNOTE: Adjust after performing CUT OFF adjustment.
old silicon grease. (Old grease may cause damages to the
1.Place the set with Aging Test for more than 10 minutes.
IC and Transistor.)2.Receive the gray scale pattern from the Pattern Generator.
Prepare the following measurement tools for electrical3.Using the remote control, set the brightness and contrast
adjustments.to normal position.
4.Activate the adjustment mode display of Fig. 1-1 and
1. Oscilloscope
2. Digital Voltmeterpress the channel button (10) on the remote control to
3. Pattern Generatorselect OR. BIAS�.
5.Press the CH. UP/DOWN button on the remote control to
On-Screen Display Adjustmentselect the OR. BIAS�, OG. BIAS�, OB. BIAS�, OR. DRIVE� or
1. In the condition of NO indication on the screen.OB. DRIVE�.
Press the VOL. DOWN button on the set and the Channel6.Adjust the VOL. UP/DOWN button on the remote control
button (9) on the remote control for more than 1 second toto whiten the R. BIAS, G. BIAS, B. BIAS, R. DRIVE, and
appear the adjustment mode on the screen as shown inB. DRIVE at each step tone sections equally.
Fig. 1-1.7.Perform the above adjustments 5 and 6 until the white
color is looked like a white.
TV2-3: FOCUS
1.Receive the monoscope pattern.
2.Turn the Focus Volume fully counterclockwise once.
3.Adjust the Focus Volume until picture is distinct.
00 OSD 232-4: HORIZONTAL PHASE
Fig. 1-11.Receive the monoscope pattern.
2.Using the remote control, set the brightness and contrast
3.Use the Channel UP/DOWN button or Channel buttonto normal position.
(0-9) on the remote control to select the options shown3.Activate the adjustment mode display of Fig. 1-1 and
in Fig. 1-2.press the channel button (05) on the remote control to
4.Press the MENU button on the remote control to end theselect OH. PHAS�.
adjustments.4.Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on right and
NO. FUNCTIONNO. FUNCTIONleft becomes minimum.
00 OSD H16 CONTRAST CENT
01 CUT OFF17 CONTRAST MAX2-5: VERTICAL SHIFT
04 H. VCO18 CONTRAST MIN1.Receive the monoscope pattern.
05 H. PHASE19 COLOR CENTER
06 V. SIZE20 COLOR MAX2.Using the remote control, set the brightness and contrast
07 V. SHIFT21 COLOR MINto normal position.
08 R DRIVE22 TINT3.Activate the adjustment mode display of Fig. 1-1 and
09 B DRIVE23 SHARPNESSpress the channel button (07) on the remote control to
10 R BIAS24 FM LEVELselect OV. SFT�.
11 G BIAS25 LEVEL4.Press the VOL. UP/DOWN button on the remote control
12 B BIAS26 SEPARATION1
until the horizontal line becomes fit to the notch of the
13 BRIGHT CENT27 SEPARATION2shadow mask.
14 BRIGHT MAX28 TEST MONO
15 BRIGHT MIN29 TEST STEREO
Fig. 1-2
D-1 |
ACEC
