Instruction/ maintenance manual of the product VM-1201 Speco Technologies
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MODEL ： VM-1201 REVISION ： A0 DATE ： MAY. 21. 2001 DOCUMENT NUMBER ： SER VICE MANUAL.
W ARNING ========== For continuous protection against radiation, s hock and flame, replace only with same type and rating components specified in the approved sheets.
2.4 VER TICAL DEFLECTION BLOCK.........................................……………………..………... 8 2.5 HORIZONT AL DEF LECTION BLOCK.............................……………………............……... 8 3. TROUBLESHOOTING INSTRUCTIONS.
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 .
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.
• • • • • 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.
‧ 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).
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.
• • • • • • 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.
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.
• • • • 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.
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.
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.
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.
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.
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 .
An important point after buying a device Speco Technologies VM-1201 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Speco Technologies VM-1201 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Speco Technologies VM-1201 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Speco Technologies VM-1201 you will learn all the available features of the product, as well as information on its operation. The information that you get Speco Technologies VM-1201 will certainly help you make a decision on the purchase.
If you already are a holder of Speco Technologies VM-1201, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Speco Technologies VM-1201.
However, one of the most important roles played by the user manual is to help in solving problems with Speco Technologies VM-1201. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Speco Technologies VM-1201 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
