ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE2. BASIC ADJUSTMENTS
Read and perform these adjustments when repairing the
2-1: CONSTANT VOLTAGE
circuits or replacing electrical parts or PCB assemblies.
1.Place the set with Aging Test for more than 5 minutes.
CAUTION
2.Using the remote control, set the brightness and contrast
YUse an isolation transformer when performing any serviceto normal position.
on this chassis.
3.Set condition is AV MODE without signal.
YBefore removing the anode cap, discharge electricity4.Connect the digital voltmeter to the TP003.
because it contains high voltage.
5.Adjust the VR502 until the digital voltmeter is 123 ? 0.5V.
YWhen removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
2-2: CUT OFF
back in its original position.
YWhen you exchange IC and Transistor for a heat sink,1.Place the set with Aging Test for more than 15 minutes.
apply the silicon grease on the contact section of the heat2.Set condition is AV MODE without signal.
sink. Before applying new silicon grease, remove all the3.Using the remote control, set the brightness and contrast
old silicon grease. (Old grease may cause damages to theto normal position.
IC and Transistor.)4.Activate the adjustment mode display of Fig. 1-1 and
Prepare the following measurement tools for electricalpress the channel button (01) on the remote control to
select "CUT OFF".
adjustments.
5.Adjust the Screen Volume until a dim raster is obtained.
1. Oscilloscope
2. Digital Voltmeter
2-3: WHITE BALANCE
3. Multi-sound Generator
4. Pattern GeneratorNOTE: Adjust after performing CUT OFF adjustment.
On-Screen Display Adjustment1.Place the set with Aging Test for more than 10 minutes.
2.Receive the gray scale pattern from the Pattern Generator.
1. In the condition of NO indication on the screen.
Press the VOL. DOWN button on the set and the Channel3.Using the remote control, set the brightness and contrast
to normal position.
button (9) on the remote control for more than 1 second to
appear the adjustment mode on the screen as shown in4.Activate the adjustment mode display of Fig. 1-1 and
press the channel button (12) on the remote control to
Fig. 1-1.
select OR CUT OFF�.
5.Press the CH. UP/DOWN button on the remote control to
TVselect the OR CUT OFF�, OG CUT OFF�, OB CUT OFF�, OB.
DRIVE� or OR. DRIVE�.
6.Adjust the VOL. UP/DOWN button on the remote control
to whiten the R CUT OFF, G CUT OFF, B CUT OFF, B.
DRIVE, and R. DRIVE at each step tone sections equally.
7.Perform the above adjustments 5 and 6 until the white
00 OSD 35
color is looked like a white.
Fig. 1-1
2-4: FOCUS
3.Use the Channel UP/DOWN button or Channel button
1.Receive the monoscope pattern.
(0-9) on the remote control to select the options shown2.Turn the Focus Volume fully counterclockwise once.
in Fig. 1-2.
3.Adjust the Focus Volume until picture is distinct.
4.Press the MENU button on the remote control to end the
adjustments.
2-5: HORIZONTAL PHASE
1.Receive the monoscope pattern.
NO. FUNCTIONNO. FUNCTION
00 OSD H19 CONTRAST CENT2.Using the remote control, set the brightness and contrast
01 CUT OFF20 CONTRAST MINto normal position.
02 H. VCO21 COLOR MAX
03 H. PHASE22 COLOR CENTER3.Activate the adjustment mode display of Fig. 1-1 and
04 AFC GAIN23 COLOR MINpress the channel button (03) on the remote control to
05 V. SHIFT24 TINT
06 H. SIZE25 SHARPNESSselect OH. PHAS�.
07 V. SIZE26 Cb DELAY FINE4.Press the VOL. UP/DOWN button on the remote control
08 V. LINEARITY27 Cr DELAY FINE
09 VS CORRECTION28 Cb PEDESTAL ADJuntil the SHIFT quantity of the OVER SCAN on right and
10 DRIVE R29 Cr PEDESTAL ADJleft becomes minimum.
11 DRIVE B30 E/W PARABOLA
12 R CUT OFF31 E/W CORNER
13 G CUT OFF32 E/W TRAPEZIUM
14 B CUT OFF33 LEVEL
15 BRIGHT MAX34 SEPARATION1
16 BRIGHT CENT35 SEPARATION2
17 BRIGHT MIN88 READ DATA
18 CONTRAST MAX
Fig. 1-2
D-1 |
ACEC
