14D2-SS
20D2-SS
21D2-SS
B
B
MgR
G
Cy100%WFig. 1-1Fig. 1-1
CyGMgR
veform or othersYveform orothersYSAME LEVELveform orothers
WaWWaWaW
75%
each short test.
* Select one of Q883/5/7 to do
.
9-2
Fig. 1-1
(Continued)sec/div.
?
200mV/div. (AC)(Use Probe 10:1)
CHROMA ADJUSTMENT
L
in.
PAUsing the R/C call "SUB COL" in SERVICE mode. Adjust SUB COLOUR bus data, so that the 75% White & Red portions of PAL Colour Bar be at the same level shown as Clear the SERVICE mode.After adjust SUB-COL, set COL-OP=14,
*Before adjust SUB-COL, make sure COL- OP=8, COL-OS=8, COL-O3=4, COL-O4=4. NTSC CHROMA ADJUSTMENTAV BLUE-OUT. ?Range: ?Sweep time: 10 just the "SUB-TINT" bus data to obtain the wave- form shown as Fig. 1-1.make sure the protector ON and switch to standby mode.Connect output of Bias Box to D603 cathode (R610 side).Set voltage of Bias Box to 18V and make sure the protector is not working.Set voltage of Bias Box to 27V, and make sure the protector is working.testing in +B line, check all possible damaged components on +B line. (Use random selected set for inspection)
4.5.1.Receive the "NTSC 3.58 Colour Bar" signal thru2.Connect the oscilloscope to TP47B (P882 pin 5)3.Call the "SUB-TINT" mode in service mode. Ad-4.Clear the SERVICE mode.1.Receive "Monoscope Pattern" signal. 2.Set CONTRAST MAX. 3.Set BRIGHT MAX. 4.During the Collector & Emitter of Q883/5/7 short,1.Receive "Monoscope Pattern" signal. 2.3.4.1.Once finish rectified Electrolytic Capacitor short
2CPROTECTOR OPERATION CHECKING
2C BUS
SUB COLOUR (ICONTROL)SUB-TINT (IBUS CON- TROL)BEAM PRO- TECTORH. V PROTEC- TOROther protectors
11123
No.Adjusting pointAdjusting procedure/conditionsNo.Adjusting pointAdjusting procedure/conditionsNo.Adjusting pointAdjusting procedure/conditions
Focusing point (middle of center and edge of monoscope pattern)
50
veform or othersveform or othersveform or others
WaWaWa
Figure:
A(20"
?
100
?
WHITE BALANCE
9-1
A(14").
(Continued)?sec/div.
?
100
?
CHROMA ADJUSTMENT
current must be within 1100 L
PARange: 20 V/div. (AC) (Using 10:1 probe)Sweep time: 10
Connect the DC miliammeter between TP603 (+) & TP602 (?). (Full Scale: 3 mA Range) Beam and 21"), 800 Increase or decrease "V-LIN" by Volume key till the horizontal line in the center of monoscope is just at the position where the blanking starts.till the picture is centered.set overscan of 9.5% typical. Adjustment Spec 9.5% range +1% -0%.Increase or decrease "H-CENT" by Volume key to center the picture horizontal.adjust V-Slope, V-Shift and V-Amp to makesure adjustment is in acceptable Ring-Shaped.center and edge of the monoscope pattern (as shown in the figure) to get the best focusing. (Make the character "50" on right edge of monoscope as fine as possible)Red Cathode(D882 Cathode) for 21" (Normal Neck). Red Cathode(D881 Cathode) for 14"/20" (Mini Neck). ??
SUB-BRIGHT ADJUSTMENT1.Receive the "Monoscope Pattern" signal. 2.Press R/C to set Picture NORMAL condition. 3.4.1.Receive Monoscope Pattern Signal. 2.Call the "V-LIN" mode. 3.1.Call the "V-CENT" mode. 2. Increase or decrease "V-CENT" by Volume key1.Call the "V-AMP" mode. 2.Increase or decrease "V-AMP" by Volume key to1.Call the "H-CENT" mode. 2.1. SET DATA TO 20(21"), 17(20" and 14"). * Check the E-5 CH Monoscope Pattern then re-1. SET DATA TO 20.1.Receive the "Monoscope Pattern" signal. 2.Press R/C to set Picture NORMAL condition.3.Adjust the focus control by focusing at middle of 1.Receive the "PAL Colour Bar" signal. 2.Press R/C to set Picture Normal condition. 3.Connect the oscilloscope to
BUS C2 C
2
2C(I2(IC BUS
-LIN (I-CENT2C BUS-AMP 2C BUS
Max beam checkVCONTROL)V(ICONTROL)VBUS CON- TROL)H-CENT BUS CON- TROL)S-CORREC- TION(ICONTROL)SUB-SHARP- NESSFocusSUB COLOUR (ICONTROL)
412345611
CRT CUT-OFF, AND HORIZONTAL VERTICAL DEFLECTION LOOP AND FOCUS ADJUSTMENTNo.Adjusting pointAdjusting procedure/conditionsNo.Adjusting pointAdjusting procedure/conditionsNo.Adjusting pointAdjusting procedure/conditions
9 |
ACEC
