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 111 ? 1V.
CAUTION
YUse an isolation transformer when performing any2-2: RF AGC
service on this chassis.1.Receive a 70dB monoscope pattern.
YBefore removing the anode cap, discharge electricity
because it contains high voltage.2.Connect the digital voltmeter between the TP001 and
YWhen removing a PCB or related component, afterthe GND .
3.Activate the adjustment mode display of Fig. 1-1 and
unfastening or changing a wire, be sure to put the wirepress the channel button (02) on the remote control to
back in its original position.
Inferior silicon grease can damage IC's and transistors.select "RF. AGC".
YWhen replacing IC's and transistors, use only specified4.Press the VOL. UP/DOWN button on the remote
control until the digital voltmeter is 1.95 ? 0.05V.
silicon grease.
Remove all old silicon before applying new silicon.
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=32, G. BIAS=32,
1. Synchro ScopeB. BIAS=32, BRIGHTNESS=70, UNI COLOR=64.
2. Digital Voltmeter2.Place the set with Aging Test for more than 15 minutes.
3.Activate the adjustment mode display of Fig. 1-1 and
On-Screen Display Adjustmentpress the channel button (01) on the remote control to
1. In the condition of NO indication on the screen.select "CUT OFF".
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 than
1 second to appear the adjustment mode on the screen2-4: WHITE BALANCE
as shown in Fig. 1-1.NOTE: Adjust after performing CUT OFF adjustment.
1.Place the set with Aging Test for more than 10 minutes.
2.Receive the white 100% signal from the Pattern
TV
Generator.
3.Using the adjustment 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
00 OSD 15select "R. BIAS".
5.Using the VOL. UP/DOWN button on the remote control,
Fig. 1-1adjust the R. BIAS.
2. Use the Channel UP/DOWN button or Channel button6.Press the CH. UP/DOWN button on the remote control to
select the "G. DRV", "B. DRV", "G. BIAS" or "B. BIAS".
(0-9) on the remote control to select the options shown7.Using the VOL. UP/DOWN button on the remote control,
in Fig. 1-2.adjust the G. DRV, B. DRV, G. BIAS or B. BIAS.
3. Press the MENU button on the remote control to end
the adjustments.8.Perform the above adjustments 6 and 7 until the white
color is looked like a white.
NO. FUNCTIONNO. FUNCTION2-5: FOCUS
00 OSD H17 SUBCONT
01 CUT OFF18 UNI COL1.Receive a 70dB monoscope pattern.
02 RF. AGC19 ---2.Turn the Focus Volume fully counterclockwise once.
03 ---20 TINT3.Adjust the Focus Volume until picture is distinct.
04 H. POSI21 SHARP
05 V. POSI22 RGB CONT2-6: HORIZONTAL POSITION
06 H. SIZE23 PARABOLA
07 V. SIZE24 TRAPEZIU1.Receive the center cross signal from the Pattern
08 V. CENT25 COR TOPGenerator.
09 V. LIN26 COR BTM2.Using the remote control, set the brightness and
10 VS. CORR27 V EHTcontrast to normal position.
11 G. DRV28 H EHT3.Activate the adjustment mode display of Fig. 1-1 and
12 B. DRV29 FM. LVLpress the channel button (04) on the remote control to
13 R. BIAS30 LEVELselect "H. POSI".
14 G. BIAS31 SEP1
15 B. BIAS32 SEP24.Press the VOL. UP/DOWN button on the remote
16 BRI33 T. STEcontrol until the right and left screen size of the vertical
Fig. 1-2line becomes the same. |
ACEC
TOSHIBA
