20PL83
CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
No. Adjusting pointAdjusting procedure/conditionsWaveform and others
1CRT CUTOFF1. Switch TV to VIDEO mode,BLUE BACK OFF, with
ADJUSTMENTNO VIDEO signal.
3.5Vdc
2
(IC BUS2. Press R/C to set Picture Normal condition.
CONTROL)3. Connect the oscilloscope to Red OUT from
IC801.(TP47R)
Range: 1 V/Div (DC)
Sweep: 5 msec/Div
1 V
4. Adjust SCREEN VR ,so that the tip of signal reach
0
3.5 Vdc + 0.1 Vdc.
2SUB-BRIGHT-1. Call " SUB-BRI" in service mode. (Receive Cross-
NESShatch pattern with 5 black level windows)
ADJUSMENT2. Adjust the " SUB BRIGHT " bus data in order that
2
(IC BUSthe line 1, 2 and 3 have the same darkness
CONTROL)wherelse line 4 is slightly brighter than line 1, 21 2 3 4 5
and 3 and finally line 5 will be the brighter than
line 4.
1, 2, 3 are in same black level.
3WHITE BAL-1. Receive the "Monoscope Pattern" signal.# 11,600! K X : 0.273
ANCE SERV-2. Press R/C to set Picture NORMAL condition.Y : 0.280
ICE MODE3. Connect the DC miliammeter between the TP 602
ADJ. (I2C BUS( - ) TP 603 ( + ).( MINOLTA COLOUR ANALYZER
CONTROL)4. Check Beam current should be around (990?A)CA-100)
5. Set it to service mode and adjust the DRI-G-MH,*NOTE: Above DATA can be UP/
& DRI-B-MH data to have a colour temperDOWN baturey volume key.
of 11,600!K ( white ).
6. Receive "WHITE" pattern, WITH BURST signal,LOWHIGH
22
and set BRIGHTNESS Y by generator, to ** 1020" 1.8cd/m115cd/m
cd/m2 (MINOLTA CA-100) by reducing LUMINATE
Y signal.* 11,600! K
7. Adjust "CUT-R" & "CUT-G" to get 11,600!K. Then DRI-GW="DRI-GS"DATA-5
go back NORMAL mode (HIGH BRIGHT**) toDRI-BW="DRI-BS" DATA-5
check colour temperature. If out of range, back
to (1).
Note:This adjustment must be done after
warming up the unit for 30 minutes or
longer with a beam current over 500?A.
DRI-R-MH=32(FIXED)
DRI-G-MH=33(FIXED)
DRI-B-MH=37(FIXED)
DRI-R-MH=32(FIXED)
4Maximum1. Receive the "Monoscope Pattern" signal.
beam check2. Press R/C to set Picture NORMAL condition.
3. Connect the DC miliammeter between TP603 (+)
and TP602 �().
(Full Scale: 3 mA Range)
4. Beam current must be within 990 ? 50 ?A.
12 |