SHARP 14A1RU
Service Manual

CONVERGENCE CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
BGR ADJ. 2. Using the remote controller, call NORMAL mode. ADJUSTMENT NO VIDEO signal.
2

14A1-RU 14A2-RU

No. point Adjusting procedure/conditions Waveform and others

CONVERGENC Receive the "Crosshatch Pattern" signal. 1 CRT CUTOFF 1. Switch TV to VIDEO mode,BLUE BACK OFF, with ( To be done (I C BUS 2. Press R/C to set Picture Normal condition.
G adjustment. 1. Turn the 4-pole magnet to a proper opening anIC801.(TP851) R
3.0Vdc

after purity STATIC CONVERGENCE B CONTROL) 3. Connect the oscilloscope to Red OUT from

gle in order to superpose the blue and red colours. Range : 1 V/Div (DC)
RGB R

2. Turn the 6-pole magnet to a proper opening anFig. 5-1 Sweep : 5 msec/Div
0

gle in order to superpose the green colour over 1 V blue and red colours. 4. Adjust SCREEN VR ,so that the tip of signal reach 3.0 Vdc + 0.1 Vdc.

DYNAMIC CONVERGENCE G Adjust convergence on fringes of the B 2 SUB-BRIGHT1. Call " SUB-BRI" in service mode. (Receive CrossFig. 5-2 2 (I C BUS line 1, 2 and 3 have the same darkness
B

NESS hatch pattern with 5 black level windows) screen in the following steps. ADJUSMENT 2. Adjust SUB BRIGHT " bus data in order that a) Fig. 5-1: Drive the wedge at point "a" and swing the deflection coil upward.

b) Fig. 5-2: Drive the wedge at points "b" and "c" RGB CONTROL) wherelse is slightly brighter than line 1, 1 2 3 4 5

c) Fig. 5-3: Drive the "c" wedge deeper and swing R line 4. 1, 2, 3 are in same black level.

swing deflection coil downward. 3 and finally line 5 will be the brighter than G

the deflection coil rightward.

d) Fig. 5-4: Drive the "b" wedge deeper and swing 3 WHITE BAL1. Receive the "Monoscope Pattern" signal. Refer to Page 6.

2. Fix all wedges on the CRT and apply glass Fig. 5-3 ICE MODE 3. Connect DC miliammeter between the TP 602 Y : 0.310 3. Apply lacquer to the deflection yoke lock screw, G 7500°K ( white ). DOWN by volume key.
R

the deflection coil leftward. ANCE SERV2. Press R/C to set Picture NORMAL condition. # 7500° K X : 0.300

tape over them. BGR ADJ. (I2C BUS ) TP 603 ( + ).

CONTROL) 4. Check Beam current should be around 800µA) ( MINOLTA COLOUR ANALYZER

magnet unit (purity, 4-pole, 6-pole magnets) and B 5. Set it to service mode and adjust the DRI-GS, & CA-100) magnet unit lock screw. DRI-BS data to have a colour temperature of *NOTE: Above DATA can be UP/

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Wedge "a" LUMINATE Y signal. 20"/21" 10cd/m2 120cd/m2

Finally received the Red-only and Blue-only sig6. Receive "WHITE" pattern, WITH BURST signal, nals to make sure there is no other colours on the Fig. 5-4 and set BRIGHTNESS Y by generator, to ** 10 LOW HIGH screen. cd/m2 (MINOLTA CA-100) by reducing 14" 10cd/m2 200cd/m2 7. Adjust "CUT-R" & "CUT-G" to get 7,500. Then go

back NORMAL mode (HIGH BRIGHT**) to check * 7500° K About
100° colour temperature. If out of range, back to (1). DRI-GW="DRI-GS"DATA-5

DRI-BW="DRI-BS" DATA-5
Lacquer Note: This adjustment must be done after Wedge "b" "c"

warming up the unit for 30 minutes or longer with a beam current over 500µA. * ADJUST DRI-GC/GW, DRI-BC/BW as following DATA, after finishing DRI-BS and DRI-GS DATA ADJUSTMENT.
6-pole magnet DRI-BW="DRI-BS"-7*DRI-RC=25*, DRI-

4-pole magnet DRI-RW=32 (FIXED), DRI-GW="DRI-GS"-7*,

BC="DRI-BS", DRI-GC="DRI-GS"-7* CRT neck 4 Maximum 1. Receive the "Monoscope Pattern" signal. beam check 2. Press R/C to set Picture NORMAL condition.
Purity magnet (Full Scale: 3 mA Range) Lacquer 40cm and TP602 (–).

3. Connect the DC miliammeter between TP603 (+) 4. Beam current must be within 800 ± 100 µA.

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