Speco Technologies VM-1201 - Manuals

Page 2 - WARNING; Disclaimer; Speco Technologies; reserves the right to revise this publication and to; Table of Contents; Vertical guard.......................................................................................... 7

WARNING ========== For continuous protection against radiation, shock and flame, replace only with same type and rating components specified in the approved sheets. Disclaimer Speco Technologies makes no representation or warranties, either expressed or implied, with respect to the contents hereof a...

Page 4 - Operational Specification; Environment

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 Technologies monitor. It gives information regarding the opera...

Page 5 - Functional Specification

1.1.2 Signal Input Requirements ‧ Connector For CVBS ： BNC terminal Type ： 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 Requirements ‧ Operating Voltage Range ： 90 ~ 264 V AC at 50 / 60 ± 3Hz ‧ Input Curre...

Page 6 - Quality

• • • • • Temperature ： 25 ± 5 ℃ Magnetic field ： No additional magnetic field in near side AC line Input ： 100 ~ 240 V AC ± 10%, 50/60 ± 3Hz Warm-up Time ： 30 minutes min. after power on and signal applied Ambient light ： 400 to 600 lux. 1.2.1 Display Quality ‧ Display area (monoscope pattern) ： fu...

Page 7 - Theory of Operation

‧ 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...

Page 8 - Main Power Supply Block

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/off control ： Power swit...

Page 9 - Video input block; Signal input buffering and switch

• • • • • • 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 Video input block Signal input buffering and switc...

Page 10 - The sandcastle output pulse generated at pin17.; Vertical Deflection Block; • Power amplifier

black level is stored at pin7 by C404. The slicing 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, C...

Page 11 - Horizontal Deflection Block; Troubleshooting Instructions

• • • • 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 Vertical size control ： VR301, R312, R308. 2.5 Horizontal Deflection Block Horizontal drive buffering ： Driving source-U401 pin11. Driving...

Page 12 - Vertical Deflection Failure; check and fix

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....

Page 13 - Appendix A. Spare Parts List

Appendix A. Spare Parts List Location Parts Number Description F901 28-1100-0006 Fuse, 2A/250V, slow blow D901 06-3100-0005 Diode 3A, 600V, RS407 D902 06-1100-0001 Diode, 1.5A, 800V, BA159 D501, D502 06-1100-0023 Diode, 3A, 800V, FR107 D903, D904, D301 06-1100-0014 Diode, FR1005 D906, D401 06-1100-0...

Page 14 - Appendix B. Schematics and PCB Layout Diagram; Schematics Page 2 – Power Supply, Video Amplifier

Appendix B. Schematics and PCB Layout Diagram 1. Schematics Page 1 -- Main Board, Video Board. 2. Schematics Page 2 – Power Supply, Video Amplifier 3. PCB Layout -- Video Board, Circuit Trace 4. PCB Layout -- Main Board, Silk Screen 13