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 15 minutes.
circuits or replacing electrical parts or PCB assemblies.2.Set condition is AV MODE without signal.
CAUTION3.Using the remote control, set the brightness and contrast
to normal position.
YUse an isolation transformer when performing any service4.Connect the digital voltmeter to the TP402.
on this chassis.5.Adjust the VR502 until the digital voltmeter is 130 ? 1V.
YBefore removing the anode cap, discharge electricity
because it contains high voltage.2-2: RF AGC
YWhen removing a PCB or related component, after
1. Place the set with Aging Test for more than 15 minutes.
unfastening or changing a wire, be sure to put the wire
back in its original position.2. Receive the VHF HIGH (63dB).
3. Connect the digital voltmeter to the TP001.
YWhen you exchange IC and Transistor for a heat sink, apply
the silicon grease on the contact section of the heat sink.4. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (02) on the remote control to
Before applying new silicon grease, remove all the old
silicon grease. (Old grease may cause damages to the ICselect "RF.AGC".
5. Press the VOL. UP/DOWN button on the remote control
and Transistor.)
until the digital voltmeter is 2.5 ? 0.05V.
Prepare the following measurement tools for electrical
adjustments.2-3: CUT OFF
1. Oscilloscope1.Adjust the unit to the following settings.
2. Digital VoltmeterR.DRIVE=10, B.DRIVE=10, R.BIAS=64, G.BIAS=64,
3. Multi-sound GeneratorB.BIAS=64, BRIGHTNESS=124, CONTRAST=65.
4. Pattern Generator2.Place the set with Aging Test for more than 15 minutes.
On-Screen Display Adjustment3.Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
1. In the condition of NO indication on the screen.select "CUT OFF".
Press the VOL. DOWN button on the set and the Channel4.Adjust the Screen Volume until a dim raster is obtained.
button (9) on the remote control for more than 1 second to
appear the adjustment mode on the screen as shown in2-4: WHITE BALANCE
Fig. 1-1.
NOTE: Adjust after performing CUT OFF adjustment.
1.Place the set with Aging Test for more than 10 minutes.
TV2.Receive the gray scale pattern from the Pattern Generator.
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 (10) on the remote control to
select OR. BIAS�.
00 OSD 155.Press the CH. UP/DOWN button on the remote control to
Fig. 1-1select the OR. BIAS�, OG. BIAS�, OB. BIAS�, OR. DRIVE� or
OB. DRIVE�.
2. Use the Channel UP/DOWN button or Channel button (0-6.Adjust the VOL. UP/DOWN button on the remote control
9) on the remote control to select the options shown into whiten the R. BIAS, G. BIAS, B. BIAS, R. DRIVE, and
Fig. 1-2.B. DRIVE at each step tone sections equally.
3. Press the ACTION 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 H16 CONTRAST CENT
01CUT OFF17 CONTRAST MAX1.Receive a broadcast.
02RF AGC18 CONTRAST MIN2.Turn the Focus Volume fully counterclockwise once.
03VIF VCO19 COLOR CENT
04H.VCO20 COLOR MAX3.Adjust the Focus Volume until picture is distinct.
05H.PHASE21 COLOR MIN
06V.SIZE22 TINT
07V.SHIFT23 SHARPNESS
08R.DRIVE24 FM LEVEL
09B.DRIVE25 LEVEL
10R.BIAS26 SEPARATION 1
11G.BIAS27 SEPARATION 2
12B.BIAS28 TEST MONO
13BRIGHT CENT29 TEST STEREO
14BRIGHT MAX30 X-RAY TEST
15BRIGHT MIN
Fig. 1-2 |
ACEC
