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CONVERGENCE ADJUSTMENT CUT OFF , WHITE BALANCE, SUB BRIGHT, & FOCUS ADJUSTMENT.
NO POINT ADJUSTMENT CONDITION/PROCEDURE WAVEFORM OR OTHERS
2
CONVERGENCE Receive the "CROSSHATCH R G B 1 CRT Cut OFF ADJ. 1. Switch TV to VIDEO MODE, Blue Back: * Before adjustment , make
R
(To be done after the PATTERN" signal. (I C BUS CONTROL) OFF, Without Video Signal. sure that this adjustment purity adjustment.) Using remote controller, call 2. Connect oscilloscope to TP851. with the initial bus data
NORMAL mode. (Use a 10:1 probe) "White Point (G)" & G (Static convergence) Range: 500mV/div "White Point (B)" are 32. B 1. Turn the 4 pole magnet to a proper Sweep Time: 5ms/div opening angle in order to superpose the Press "DC" mode blue and red colours. Figure a 3. Using the remote controller, call 2. Turn the 6 pole magnet to a proper NORMAL mode. opening angle in order to superpose 4. Adjust Screen VR so that the tip of B G R green colour over the blue and red signal reach 2.5Vdc ± 0.1Vdc. Figure 5 colours.
B 2 Balance ADJ. 5. Receive the MONOSCOPE PATTERN *Note : White Point (G) G 2 UP 2 " KEY (I C BUS CONTROL) signal.
(Dynamic convergence) screen in the following steps. 7. Adjust (G)", "White Point White Point (B) a) Fig. a : Drive the wedge at point "a" upward. 1. Adjust convergence on the fringes of 6. Call the "BKGD" in SERVICE mode. UP 3 " KEY (B)" data to have a colour temperature of 12300k (White) *Note.
R
DOWN 5 " KEY
b) Fig. b : Drive the wedge at point "a" R G B UP / DOWN.
G deflection coil downward. *12300k x=272 R c) Fig. c : Drive the "c" wedge deeper
and swing the deflection coil Figure b DOWN 6 " KEY As the above data can be
"b" and swing the B
y=275
and swing the deflection coil (Minolta Colour Analyzer rightward. CA-100) Figure c 3 SUBBRIGHT ADJ. 8. Receive the "CROSSHATCH and swing the deflection coil (I C BUS CONTROL) PATTERN" Signal. 9. Call the "SUB BRI" in SERVICE mode. 10. Adjust the "SUB-BRI" bus data, so that 3. Apply lacquer to the deflection yoke lock screw, magnet unit ( purity 4 pole, 6 1 2 3 4 5
9
Figure d 1500µA. Finally received the Red only and Blue 12. Press P-NORMAL key.
About 100� 6-pole Magnet
d) Fig. d : Drive the "b" wedge deeper
2
leftward.
2. Fix all wedges on the CRT and apply B G R
glass tape over them. R
pole magnets ) and magnet unit lock Figure 6 screw.
No. 2 line inside the window area G will disappear. B Note: Before starting this adjustment, warm up the unit for 30 minutes or longer at a beam current of 1300 ~
only signals to make sure there is no other colours on screen. 4 BEAM CURRENT 11. Receive the "MONOSCOPE PATTERN" Wedge "a" CHECK Signal. 4-pole Magnet 13. Connect the DC Milliammeter between 3.0 mA Range). Figure 3 5 FOCUS ADJ. 1. Receive the "MONOSCOPE PATTERN"
Lacquer signal.
CRT NECK Lacquer TP601 (-) and TP602 (+). (Full Scale:
"b" Wedge "c"
14. Beam current Must be 1400 ± 100µA.
Purity Magnet NECK
2. Using the remote control, call NORMAL Figure 4 3. Adjust FOCUS control so that the shaded
mode.
29R600P
area of screen be in optimal focus.
Figure 7
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