SHARP 14R2MK2
Service Manual

14R2MK2 21R2MK2

CONVERGENCE CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT

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
2 3.0Vdc

ADJ. 2. Using the remote controller, call NORMAL mode. BGR ADJUSTMENT NO VIDEO signal. ( 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(14")/TP852(21")) R

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 anSweep : 5 msec/Div Fig. 5-1 3.0 Vdc ± 0.1 Vdc. 2 SUB-BRIGHTCall " SUB-BRI" in service mode. (Receive Cross1. Adjust convergence on fringes of the B Fig. 5-2 2 (I C BUS line 1, 2 and 3 have the same darkness the deflection coil upward.
B
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

DYNAMIC CONVERGENCE G

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

1 3 5 b) Fig. 5-2: Drive the wedge at points "b" and "c" RGB CONTROL) wherelse 4 is slightly brighter than line 1, 2
3 finally line 5 will be brighter than and swing the deflection coil downward. G line 4. c) Fig. 5-3: Drive the "c" wedge deeper and swing R 1, 2, 3 are in same black level.

the deflection coil rightward. Fig. 5-3 2. Fix all wedges on the CRT and apply glass 3. Apply lacquer to the deflection yoke lock screw,
R G

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

the deflection coil leftward. ANCE SERV2. Press R/C to set Picture NORMAL condition. # 18000° K X : 0.255

ICE MODE 3. Connect DC miliammeter between the TP 602 Y : 0.255

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

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

magnet unit (purity, 4-pole, 6-pole magnets) and B 800µA(14")/1100µA(21") CA-100) magnet unit lock screw. 5. Set it to service mode and adjust the DRI-GS, & *NOTE: Above DATA can be UP/ DRI-BS data to have a colour temperature of DOWN by volume key.

8
Wedge "a" cd/m2 (MINOLTA CA-100) by reducing 20"/21" 10cd/m2 120cd/m2 About 7. Adjust "CUT-R" & "CUT-G" to get color temperture * 18000° K 100¡ #. Then go back NORMAL mode (HIGH DRI-GC="DRI-GS"DATA-5 Lacquer range, back to (1).

Finally received the Red-only and Blue-only sig12,300°K or 7500°K ( white ). nals to make sure there is no other colours on the Fig. 5-4 6. Receive "WHITE" pattern, WITH BURST signal, LOW HIGH screen. and set BRIGHTNESS Y by generator, to ** 10 14" 10cd/m2 200cd/m2

LUMINATE Y signal.

BRIGHT**) to check colour temperature. If out of DRI-RC=27 Note: This adjustment must be done after
Wedge

warming up the unit for 30 minutes or longer with a beam current over "b" "c" 500µA(14")/700µA(21"). * ADJUST DRI-GC/GW, DRI-BC/BW as following DATA, after finishing DRI-BS and DRI-GS DATA
6-pole magnet DRI-RW=32 (FIXED), DRI-GW="DRI-GS"-7*, CRT neck DRI-BW="DRI-BS"-7*DRI-RC=25*, DRI-

4-pole magnet ADJUSTMENT.

BC="DRI-BS", DRI-GC="DRI-GS"-7* 4 Maximum 1. Receive the "Monoscope Pattern" signal. beam check 2. Press R/C to set Picture NORMAL condition.
Lacquer 40cm (21") and TP602 (�).

3. Connect the DC miliammeter between TP603 (+)
20cm (14") Purity magnet

(Full Scale: 3 mA Range)

4. Beam current must be within 800±100 µA(14")/

1100 ± 100 µA(21").

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