SHARP 14R2BK
Instrukcja Serwisowa

14R2BK

CONVERGENCE CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
BGR ( To be done (I C BUS DRI-RS/RW/RC, DRI-GS/GW/GC, DRI-BS/BW/ same as beside procedure. 2

No. point Adjustment conditions/procedure Waveform or others No. point Adjustment conditions/procedure Waveform or others

1 CONVERGENCE 1. Receive the "Crosshatch Pattern" signal. 1 CRT CUTOFF Remark *Alternative Procedure

ADJ. 2. Using the remote controller, call NORMAL mode. ADJUSTMENT 1. Before CRT cutoff adjustment, SUB-BRIGHT, (1) Step (1), (2), (3) and (4) are

after the purity STATIC CONVERGENCE CONTROL) BC, CUT-R and CUT-G must be INITIAL DATA. (2) Then continue adjust until readjustment. 1. Turn the 4-pole magnet to a proper opening anG

2. Turn the 6-pole magnet to a proper opening anNO VIDEO signal. related test points as below gle in order to superpose the green colour over sistor. TP47G, BLUE = TP47B. *4. Next, checking AKB circuit function by slowly in(4) Then adjust Screen VR until the DYNAMIC CONVERGENCE R suddenly on and off (AKB start function). 3.3Vdc B Fig. 5-1

R ours. 1. Switch TV VIDEO mode,BLUE BACK OFF, with (3) Connect the oscilloscope to

B 2. CRT Cutoff adjustment must be done inside a trace line appear and make sure dark room. the colour appear whether red, green or blue.
gle in order to superpose the blue and red col-

2. Press R/C to set Picture Normal condition. which is based on colour appear blue and red colours. RGB 3. First, off the by adjust screen variable reat (2) RED TP47R, GREEN =

1. Adjust convergence on fringes of the G crease screen variable resistor until colour raster tip of signal reach 3.3Vdc.

RGB
adjustment.nextthecontinueGt

screen in the following steps. 5. Then continue adjust until retrace line appear. a) Fig. 5-1: Drive the wedge at point "a" and swing 6. Finally, slowly decrease the screen variable rethe deflection coil upward. Fig. 5-2 sistor until screen retrace line cut off. (Not Raster) b) Fig. 5-2: Drive the wedge at points "b" and "c" Note : and swing deflection coil downward. Must confirm the AKB function in set before B c) Fig. 5-3: Drive the "c" wedge deeper and swing

R 0 the deflection coil rightward.
NESS hatch pattern with 5 black level windows) the deflection coil leftward.

d) Fig. 5-4: Drive the "b" wedge deeper and swing 2 SUB-BRIGHT1. Call " SUB-BRI" in service mode. (Receive Cross1 Fig. 5-3 (I C BUS that line 1and 2 have the tapesame overdarkness them.2

2. Fix all wedges on the CRT and apply glass ADJUSMENT *(2) Adjust the SUB BRIGHT " bus data in order 1 2 3 4 5

R 2. Finally data minus 1 to make line 1, 2, B brighter than line 2 magnet unit lock screw.

BGR CONTROL) wherelse line 3 is one step (data) brighter than 3. Apply lacquer to the deflection yoke lock screw,

magnet unit (purity, 4-pole, 6-pole magnets) and G Line 3 is one step (data) and 3 are in same level (darkness).

2
1 2 3 4 5 Fig. 5-4

8
screen.

Finally received the Red-only and Blue-only signals to make sure there is no other colours on the

Wedge "a" About 100° Lacquer Wedge "c" "b"

4-pole magnet 6-pole magnet CRT neck

Note*** SAMSUNG CRT : 32mm CPT CRT : 35mm TOSHIBA CRT : 35mm

Purity magnet

Lacquer Note***

8-1 8-2