CONVERGENCE ADJUSTMENTCRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
NO. Adjustment partAdjusting procedure and conditionsWaveform and othersNO. Adjustment partAdjusting procedure and conditionsWaveform and others
1 CONVERGENCE1. Receive the "Crosshatch Pattern" signal.1CRT CUTOFF1. Switch TV to VIDEO mode, BLUE BACK OFF
BGR3.0Vdc
ADJUSTMENT2. Using the remote controller, call NORMALADJUSTMENTwith NO VIDEO signal.
(To be donemode.(I2C BUS2. Press R/C to set Picture Normal condition.
B
after the purityGCONTROL)3. Connect the oscilloscope to Red OUT from
adjustment.)Static convergenceRIC801.(TP851 (14")/TP852 (20"/21"))
1. Turn the 4-pole magnet to a proper opening
angle in order to superpose the blue and redRange: 1 V/Div (DC)
Fig. 5-1
colours.Sweep: 5 msec/Div
1 V
2. Turn the 6-pole magnet to a proper openingRGB
angle in order to superpose the green colour4. Adjust SCREEN VR, so that the tip of signal0
Fig. 6
over the blue and red colours.Rreach 3.0 ?0.1 Vdc.
G2SUB-1. Call "SUB-BRI" in service mode. (Receive
B
Dynamic convergenceBRIGHTNESSCrosshatch pattern with 5 black level windows)
1. Adjust the convergence on the fringes of theADJUSTMENT2. Adjust the "SUB BRIGHT" bus data in order
screen in the following steps.Fig. 5-2(I2C BUSthat the line 1, 2 and 3 have the same darkness
1 2 3 4 5
a) Fig. 5-1: Drive the wedge at point "a" andCONTROL)wherelse line 4 is slightly brighter than line 1,
RGB
swing the deflection coil upward.B2 and 3 and finally line 5 will be the brighter
b) Fig. 5-2: Drive the wedge at points "b"Gthan line 4.1, 2 and 3 are in same black level.
R
and "c" and swing the deflection coilFig. 7
downward.3WHITE1. Receive the "WHITE" pattern with BRefURSTer to Page 6.
c) Fig. 5-3: Drive the "c" wedge deeper andBALANCEsignal.* 7,500°KX : 0.300
swing the deflection coil rightward.Fig. 5-3SERVICE2. Press R/C to set Picture NORMAL condition.Y : 0.310
d) Fig. 5-4: Drive the "b" wedge deeper and
BGRMODE3. Connect the DC miliammeter between *TP60212,300°KX : 0.272
swing the deflection coil leftward.RADJUSTMENT(-) and TP603 (+).Y : 0.275
2. Fix all the wedges on the CRT and apply glassG(I2C BUS4. Check Beam current should be around 1,100 ?A
tape over them.BCONTROL)(14" around 800 ?A).(MINOLTA COLOUR ANALYZER
3. Apply lacquer to the deflection yoke lock screw,5. Set it to service mode and adjust the " CA-100)WPG"
magnet unit (purity, 4-pole, 6-pole magnets)(White Point-G), "WPB" (White Point-B) data*Note: AboveData can be UP/
9and magnet unit lock screw.to have a colour temperature of 12,300°K orDOWN by Volume key.
Fig. 5-4
7,500°K (white). * Note .
Finally received the Red-only and Blue-only6. Receive "WHITE" pattarn, WITH BURST signal,LOWHIGH
Wedge "a"
signals to make sure there is no other coloursand set BRIGHTNESS Y by generator, to ** 1014"10 cd/m2 200 cd/m2
on the screen.cd/m2 (MINOLTA CA-100) by reducing20"/21" 10 cd/m2 120 cd/m2
AboutAboutLUMINATE Y signal.
100°100°7. Adjust "CUT-R" & "CUT-G" to get desired colour
temperature. Then go back NORMAL mode
Lacquer(HIGH BRIGHT**) to check colour temperature.
If out of range, back to (1)
WedgeWedge
"b""c"Note: This adjustment must be done after
warming up the unit for 30 minutes
Fig. 5-5
or longer with a beam current over
700 ?A.
4-pole magnet(For 14", the beam current should be
6-pole magnetover 500 ?A)
CRT neck
* ADJUST DRI-GC/GW, DR-BC/BW AS FOL-* 7,500°K DRI-GW="DRI-GS"-5
LOWING DATA, AFTER FINISHING DRI-BSDRI-BW="DRI-BS"-5
AND DRI-GS.* 12,300°K DRI-GW="DRI-GS"-7
DRI-RW=32 (FIXED), DRI-GW="DRI-DRI-BW="DRI-BS"-7
GS"-7*, DRI-BW="DRI-BS"-7*
20mm
LacquerDRI-RC=25 (FIXED), DRI-BC="DRI-BS",
(21")
Purity magnetDRI-GC="DRI-GS"-7
40mm
(14")4Maximum1. Receive the "Monoscope Pattern" signal.
Fig. 5-6beam 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 800 ?A (14") /
1,100 ?A (21") ?100 ?A.21B-S1
9-19-2 |
ACEC
