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Speco Technologies VM-1201 - page 1
MODEL ： VM-1201 REVISION ： A0 DATE ： MAY. 21. 2001 DOCUMENT NUMBER ： SER VICE MANUAL ...
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Speco Technologies VM-1201 - page 2
W ARNING ========== For continuous protection against radiation, s hock and flame, replace only with same type and rating components specified in the approved sheets. Disclaimer Speco T echnologies makes no representation or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranties, m erc ...
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Speco Technologies VM-1201 - page 3
2.4 VER TICAL DEFLECTION BLOCK.........................................……………………..………... 8 2.5 HORIZONT AL DEF LECTION BLOCK.............................……………………............……... 8 3. TROUBLESHOOTING INSTRUCTIONS............................................……………...…….….. 9 3.1 NO DISPLA Y , NO ...
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Speco Technologies VM-1201 - page 4
Audience This service manual is primarily for system / service engineers, distributors and dealers. It carries the assumption that the reader understands the basic operating concepts. Purpose This manual contains reference data for Speco T echnologies monitor . It gives information regarding the operating principles of monitors, as well as technica ...
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Speco Technologies VM-1201 - page 5
1.1.2 Signal Input Requirements ‧ Connector For CVBS ： BNC terminal T ype ： composite video input Level ： 1.0Vp-p Synchronous ： 0.3 V Luminance ： 0.7V Polarity ： Positive bright Impedance ： 75 ohms 1.1.3 Power Input Requir ements ‧ Operating V oltage Range ： 90 ~ 264 V AC at 50 / 60 ± 3Hz ‧ Input Current at 90 V AC Operating ...
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Speco Technologies VM-1201 - page 6
• • • • • T emperature ： 25 ± 5 ℃ Magnetic field ： No additional magnetic field in near side AC line Input ： 100 ~ 240 V AC ± 10%, 50/60 ± 3Hz W arm-up T ime ： 30 minutes min. after power on and signal applied Ambient light ： 400 to 600 lux. 1.2.1 Display Quality ‧ Display area (monoscope pattern) ： full scan ‧ V ideo ...
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Speco Technologies VM-1201 - page 7
‧ Picture geometry ：≦ 2.5% ‧ Picture centering ：≦ 6mm ‧ Size stability ： Picture luminance from 5 FL to max., the size shall be less than 2.5% (with full white pattern) ‧ Swing and jitters ： Swing and jitters are not allowed (viewed at 50cm from eyes to screen). ‧ Focus ： (viewed at 50cm from eye to screen, contrast adjusted ...
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Speco Technologies VM-1201 - page 8
This section describes each functional block of the monitor . 2.1 Main Power Supply Block • • • • • • • • • • • • AC power input ： AC socket Line input noise / EMI filtering ： Line filter T902 ; X-Cap C901, C902. Y -Cap C903, C904, C905. Over current protection ： Fuse Power on/of f control ： Power switch AC to DC con ...
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Speco Technologies VM-1201 - page 9
• • • • • • Snubber circuit ： Snubber C907, D902, R902. Primary side self-powering circuit ： D903,C914. Output 13.5 volts for vertical & horizontal drive circuits ： D904, C915. Output 27.5volts for horizontal deflection circuit ： D906 ,C916. 2.2 V ideo input block Signal input buffering and switch ‧ CVBS Input buf fer ： ...
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Speco Technologies VM-1201 - page 10
black level is stored at pin7 by C404. The slici ng level is stored at pin6 by C403 and decided by R403. 2.3.4 Phase detector: The phase detector circuit is connected to pin8. The circuits are activated depending on the voltage of pin18 and the state of the Sync pulse noise detection circuit, C405, C406, R405. 2.3.5 Supply (pin9, 10 and 16) : U401 ...
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Speco Technologies VM-1201 - page 11
• • • • Flyback generator ： ‧ U301 pin6 is the output of the flyback generator that when driven, jumps from low to high condition C305 transfers the jump to pin3 V ertical size control ： VR301, R312, R308. 2.5 Horizontal Deflection Block Horizontal drive buf fering ： Driving source-U401 pin11. Driving transistor -Q40, to pull high t ...
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Speco Technologies VM-1201 - page 12
3.1.5 If driving pulses at U901 pin6 and drain of Q901 are correct but voltage at U901 pin 7 low than threshold voltage --causing U901 to stop and restart periodically , check and repair following circuits. Power transformer T901 bad; D903 short-circuit/opened. 3.2 No Display , power output normal. 3.2.1 Check and fix FBT B+ ： If no B+ （ 27.5V ...
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Speco Technologies VM-1201 - page 13
Appendix A. Spar e Parts List Location Parts Number Description F901 28-1 100-0006 Fuse, 2A/250V , slow blow D901 06-3100-0005 Diode 3A, 600V , RS407 D902 06-1 100-0001 Diode, 1.5A, 800V , BA159 D501, D502 06-1 100-0023 Diode, 3A, 800V , FR107 D903, D904, D301 06-1 100-0014 Diode, FR1005 D906, D401 06-1 100-0058 Diode, 2A, 600V , FR205 Q901 08-3100 ...
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Speco Technologies VM-1201 - page 14
Appendix B. Schematics and PCB Layout Diagram 1. Schematics Page 1 -- Main Board, V ideo Board. 2. Schematics Page 2 – Power Supply , Video Amplifier 3. PCB Layout -- V ideo Board, Cir cuit T race 4. PCB Layout -- Main Board, Silk Screen 13 ...
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Speco Technologies VM-1201 - page 15
1234 56 A B C D 6 5 4 3 2 1 D C B A Title Number Revis ion Size B D a t e : Sh ee t o f F i l e : G2 5 G4 7 K 2 HGND 4 HEAT 3 G1 1 6 J501 CRT SOCKET VR501 2MB R515 330K R6 4.7 1/4W 1 2 3 W204 C210 47U/200V R225 680K R222 8.2K 2W R223 1.5K 1/2W R224 150K C214 1U/25V 1 2 3 W205 R221 1K Q205 2SC2688 C217 47U/25V B+ 12.9V S201 SP ARK GAP PLU G AC SO CK ...
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Speco Technologies VM-1201 - page 16
123456 78 A B C D 8 7 6 5 4 3 2 1 D C B A Title Number Re vision Size D a t e : F ile: D r a wn B y : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 U401 TDA2579 C411 103 R217 15K R410 2.2K R406 18K R416 680 Q402 2SC1815 R417 1K C407 100U/25V R418 47 Q401 IRF740 R408 12K C408 1U R411 33K C410 .15 C409 2700P R411 30K VR401 H-HOLD R409 270 C416 22U/50V ...
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