AOC M600, CM—313 Service Manual
SERVICE MA NUAL
CM—313
COLOR VIDEO MON ITOR
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CM-313 VGA COLOR MONITOR
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4. ADJUSTMENT
4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS
1. Approximat ely 30 minu t e s sh ould be all o w e d f or warm up b efo re proceeding.
2. Adj u s t ments should be und e r ta k e n only on those necessary elements since mo st o f them have
been carefu l ly preset a t the f a ctory .
4-2 MAIN ADJUSTMENTS
NO.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13. HOR. CENTER
14.
15.
16.
17.
18.
FU N CTIO N LOCA TIO N DESIGNATION
B+ AD J PCB-POWER
R.G.B. D RIV E PCB - M A IN VR101, 201, 301
VERT . SI Z E FOR
ALL M O D E
VERT . SIZ E FOR
MODE 2
VERT . SIZ E FOR
MOD E 1
VERT . HO LD
VERT . LI NEAR PCB - M A I N
VERT. CEN TER
HOR. P INCUS HION GAI N
HOR. P I NCUS H I ON PHASE PCB - M A IN
HOR. H OLD
HOR. PHASE
HOR. WI DTH PCB - M A IN
SUB-BRI G HTNE S S
R.G.B. CUT - O FF CRT-B OARD VR700, 710, 720,
BRI GHTNESS
CONTRAS T
VR9 01
PCB - M A IN
PCB - M A IN
PCB-MAIN
PCB - M A IN VR4 1 1
PCB-MAIN
PCB-MAIN
PCB - M A IN
PCB -M A I N VR504
PCB - M A IN
PCB-MAIN
PCB - M A IN
PCB -M A I N
VR40 2
VR403
VR40 1
VR404
VR40 5
V R80 2
VR80 1
VR5 01
VR502
L501
VR50 5
VR508
VR6 0 1
4-3 ADJUSTMENT METHOD
1. Swit c hing regu la t o r un i t
(a) Conn e ct a DC v o ltag e mete r between TP1 and groun d , tha n adju s t VR90 1 to be 8 5Vdc.
Note : Do n ot opera te Switc hing re g u la t o r un it without a n y load.
2. Sub-Brightness: VR50 5
Measure CR T s o ck e t pin # 5 , adj us t VR505 t o be —3 2 V d c.
3. Hor. ho l d: VR-50 1
(a) Con n e ct TP2 t o gro und .
(b) Adj ust VR5 0 1 until th e bars (moving bars) are v ertica l and no t s la n tin g to l eft or right.
(c) D is co n n ec t TP 2 from groun d , th e n VR501 is a djusted p r o p erly.
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4. Hor. ce nt e r: VR502
Adjust VR502 until the raster is ju st located at ce n t e r of the panel.
(If raster is t oo dim, Adjust the screen VR of F LY-b ack transformer u ntil raster can be seen)
5. Hor. phase: V R504
Adjust VR 504 until the disp la y p i c t ure is located at t h e center of raster.
6. Hor. width: L501
Adjust h orizo ntal w idt h c oil L501 so that th e size of p i cture is 240m m
7. Vert ic a l linear : VR4 04
(a) Select a cross-hatch pattern .
(b) Adjust VR404 so that ve rt ic a l l inea r i t y is optim um.
8. Ver t ic a l size: VR401, 402, 40 3
Ver t i cal has thr ee modes, (m od e 1, 2, 3,)
(a) At F ir s t, use mode 3, signal that has vertic a l freq u e ncy 6 0 Hz a dj u s t VR402 so that v ert ica l
vertical size is 1 80 m m .
(b) Change t o mo d e 2, ad ju s t VR403 so that v e r t ic a l size is 180 mm
(c) Change to m o de 1, a d j u st VR 4 0 1 so that ver t ic al size is 1 80 m m .
9. Pincush ion adju s t m ent:
(a) Using crosshatch pa tt e r n , adju s t VR8 0 1 fo r symmetry between up-do w n side.
(b) A djus t VR802 for straight v e r tical lines on b o t h sides.
10. V e r t ical Center: V R40 5
Adjust VR 405 to c e n te r th e p icture verti c ally.
11. V e r t ic al Ho l d : VR 4 0 1
Using any p a t te r n gen era to r that has ve rt ic a l fre quen c y 50 H z and a p p l y to this monit o r. I f a
displa y quivers u p w a r d or downw a r d, t urn VR40 1 on the main PCB t o st ab iliz e it.
12. White balance:
A. In i t ial set up.
(a) Disable th e v id e o i nput signal.
(b) V R10 1, 201, 301, 700 , 71 0, 720 , set to mid dle p ositio n .
(c) Warm up more than 15 m in ut es .
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B. Bias adjustment.
(a) Adj ust G2 potentiome ter, check which color is first to appear, then turn c ut- off VR of that color
(VR700, 710, 720,) to min imu m, Again, turn G2 to more light An ot he r color appears, use this
cu t:o ff VR tor base.
(b) Using a Oscilloscope, adjust the base cu t- of f VR, so that the black level is 85Vdc.
(c) Ad just another tw o c u t-o ff VR until a faint neutral w hi te raster is produced.
C. Gain adjustment
(a) Enable all three channels (R. G. B.) to give a cross-hatch pattern on the screen.
(b) Using a oscilloscope, adjust the base drive VR (the same channel as B-(a) ), so that the
amplitude is 50Vp-p.
(c) Change the pattern to paper w hite video, turn contrast control to minim um, adjust the
luminance is 4 f t / l (fostlambert).
(d) Using a T V colo r analyzer, adjust the othe r tw o c u t-o f f VR (except the base c ut- of f V R) fo r a
white video corresponding t o a colo r temperature o f 930 0° K
(e) Tu rn contrast cont rol so that the luminance is 20 f t/ l , adjust the other two drive VR fo r the
same c olo r temperature.
(f) A few reiterations may be required to set the c olo r temperature the same at 4 f t /L and 20 f t / L
luminance level.
(g) Tu rn G2 contro l fo r raster to just appear (1 ft/l ).
13. Focus adjustment
Turn the contrast co ntro l to maximu m and set the brightness contro l to a suitable position, adjust
the focus control to the op tim um position.
14. Purity adjustment
(a) Be sure th at the display is no t being exposed to any external magnetic fields.
(b) Ensure tha t the spacing between the Purity, Convergence Magnet, (PCM), assembly and the
CRT stem is 29mm +— 1 mm. (See below diagram)
(c) Produce a complete, red pattern on the display. A dju st the Purity magnet rings on the PCM
assembly to obtain a complete field of the colo r red. This is done by moving the two tabs in
such a manner t hat they advance in an opposite d irect ion but at the same time to obtain the
same angle between the tw o tabs, which should be approx ima tely 180'.
(d) Check the complete blue and complete green patterns to observe their respective colo r pur ity.
Make min or adjustments if needed.
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RELATIVE PLAC EMENT OF T YP ICAL COMPO N ENTS
Dimensions in mm
15. Convergence adjustment
(a) Produce a magenta crosshatch on the display.
(b) Adjust the focus for the best overall focus on the display.
Also adjust the brightness to the desired c ondit ion .
(c) Vertical red and blue lines are converged by varying the angle between the tw o tabs of the 4-
pole magnets on the PCM assembly. (See above diagrams)
(d) Horizontal red and blue lines are converged by varying the two tabs together, keeping the angle
between them constant.
(e) Produce a w hi te crosshatch pattern on the display.
(f) Vertical green and magenta lines are converged by varying the angle between the two tabs of
the 6-pole magnets.
(g) Horizontal green and magenta lines are converged by varying the t wo tabs together, keeping the
angle between them constant.
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5 PCB LAYO U T
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