ELECTRICAL ADJUSTMENTS
1.BEFORE MAKING ELECTRICAL2. BASIC ADJUSTMENTS
ADJUSTMENTS2-1: CONSTANT VOLTAGE
Read and perform these adjustments when repairing the1.Place the set with Aging Test for more than 5 minutes.
circuits or replacing electrical parts or PCB assemblies.2.Set condition is AV MODE without signal.
3.Using the remote control, set the brightness and contrast
CAUTION
to normal position.
YUse an isolation transformer when performing any service
4.Connect the digital voltmeter to the TP003.
on this chassis.5.Adjust the VR502 until the digital voltmeter is 1? 1V.15
YBefore removing the anode cap, discharge electricity
because it contains high voltage.2-2: CUT OFF
YWhen removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire1.Place the set with Aging Test for more than 15 minutes.
2.Activate the adjustment mode display of Fig. 1-1 and
back in its original position.
press the channel button (01) on the remote control to
YWhen you exchange IC and Transistor for a heat sink, apply
the silicon grease on the contact section of the heat sink.select "CUT OFF".
3.Adjust the Screen Volume until a dim raster is obtained.
Before applying new silicon grease, remove all the old
silicon grease. (Old grease may cause damages to the IC
and Transistor.)2-3: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
Prepare the following measurement tools for electrical
adjustments.1.Place the set with Aging Test for more than 10 minutes.
2.Receive the gray scale pattern from the Pattern Generator.
1. Oscilloscope
3.Using the remote control, set the brightness and contrast
2. Digital Voltmeter
3. Multi-sound Generatorto normal position.
4.Activate the adjustment mode display of Fig. 1-1 and
4. Pattern Generator
press the channel button (10) on the remote control to
On-Screen Display Adjustmentselect OR. DRIVE�.
5.Press the CH. UP/DOWN button on the remote control to
1. In the condition of NO indication on the screen.
Press the VOL. DOWN button on the set and the Channelselect the OR. BIAS�, OG. BIAS�, OB. BIAS�, OR. DRIVE� or
button (9) on the remote control for more than 1 second toOB. DRIVE�.
6.Adjust the VOL. UP/DOWN button on the remote control
appear the adjustment mode on the screen as shown in
Fig. 1-1.to whiten the R. BIAS, G. BIAS, B. BIAS, R. DRIVE, and
B. DRIVE at each step tone sections equally.
7.Perform the above adjustments 5 and 6 until the white
TVcolor is looked like a white.
2-4: FOCUS
1.Receive a broadcast.
2.Turn the Focus Volume fully counterclockwise once.
3.Adjust the Focus Volume until picture is distinct.
00 OSD 25
Fig. 1-12-5: HORIZONTAL PHASE
2. Use the Channel UP/DOWN button or Channel button (0-1.Receive the monoscope pattern.
2.Using the remote control, set the brightness and contrast
9) on the remote control to select the options shown in
to normal position.
Fig. 1-2.
3. Press the MENU button on the remote control to end the3.Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
adjustments.
select "H.PHAS".
4.Press the VOL. UP/DOWN button on the remote control
NO. FUNCTIONNO. FUNCTIONNO. FUNCTIONuntil the SHIFT quantity of the OVER SCAN on right and
00OSD H13 G CUT OFF26 CB DELAY FINE
01CUT OFF14 B CUT OFF27 CR DELAY FINEleft becomes minimum.
02H.VCO15 BRIGHT MAX28 CB PEDESTAL ADJ
03H.PHASE16 BRIGHT CENT29 CR PEDESTAL ADJ
04AFC GAIN17 BRIGHT MIN30 E/W PARABOLA2-6: VERTICAL POSITION
05V.SHIFT18 CONTRAST MAX31. E/W CORNER
06H.SIZE19 CONTRAST CENT32. E/W TRAPEZIUM1.Receive the monoscope pattern.
07V.SIZE20 CONTRAST MIN33. LEVEL
08V.LINEARITY21 COLOR MAX34. SEPARATION 12.Using the remote control, set the brightness and contrast
09VS CORRECTION22 COLOR CENT35. SEPARATION 2to normal position.
10DRIVE R23 COLOR MIN
11DRIVE B24 TINT3.Check if the step No. V. SHIFT is "02".
12R CUT OFF25 SHARPNESS4.Adjust the VR401 until the horizontal line becomes fit to
Fig. 1-2
the notch of the shadow mask.
D-1 |
ACEC
TOSHIBA
