Speco VM-901B Service Manual
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Speco VM-901B Service Manual

Speco vm-901b cctv system-monitors: service manual
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Download this manual See also: Instruction Manual
SERVICE MANUAL
MODEL
REVISION
DATE
DOCUMENT NUMBER ：
：
VM-901B
：
A0
：
MAY. 21. 2001
1

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Summary of Contents for Speco VM-901B

  • Page 1 SERVICE MANUAL MODEL REVISION DATE DOCUMENT NUMBER ： ： VM-901B ： ： MAY. 21. 2001...

  • Page 2: Table Of Contents

    Furthermore Speco Technologies reserves the right to revise this publication and to make changes from time to time in contents hereof without obligation to notify any person of such revision or changes.
  • Page 3 2.4 VERTICAL DEFLECTION BLOCK...……………………..………... 2.5 HORIZONTAL DEFLECTION BLOCK...……………………...……... 3. TROUBLESHOOTING INSTRUCTIONS...……………...…….….. 3.1 NO DISPLAY, NO POWER...…………………………………………………….. 3.2 NO DISPLAY, (POWER OK)...………………………………………………………….. 3.3 NO DISPLAY, (NO ASTER) ……………………………………………...…………….. 3.4 NO PICTURE OR NO COLOR (RASTERK)...………………………...…………. 3.5 VERTICAL DEFLECTION FAILURE...…………………..……….. APPENDIX： A. SPARE PARTS LIST B.

  • Page 4: Introduction

    It can be single or double mounted in a standard 9-inch rack. Front panel controls include brightness, contrast, vertical hold horizontal hold and AC power on/off. The VM-901B is an excellent choice when you require a rugged, compact B/W monitor. The exquisite and reliable design of this monitor will provide years of trouble- free operation.

  • Page 5: Signal Input Requirements

    ：10 to 95% non-condensing Storage 1.1.2 Signal Input Requirements ‧ Connector For CVBS：BNC terminal Type：composite video input 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 ‧ Input Current at 90 V Operating：0.5 Amps rms.

  • Page 6: Functional Specification

    1.2 Functional Specification The standard conditions for verifying the following specification are as below： • Temperature • Magnetic field • AC line Input • Warm-up Time • Ambient light 1.2.1 Display Quality ‧ Display area (monoscope pattern)：full scan ‧ Video Amplifier Performance ‧...

  • Page 7: Control And Adjustments

    ‧ Horizontal ：10% maximum ‧ Vertical ‧ Picture geometry：≦ 2.5% ‧ Picture centering：≦ 6mm ‧ Size stability：Picture luminance from 5 FL to max., the size shall be less than 2.5% ‧ Swing and jitters：Swing and jitters are not allowed (viewed at 50cm from eyes to ‧...

  • Page 8: Theory Of Operation

    • Net Weight：9 Kg 2. Theory of Operation 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 ; • Over current protection：Fuse •...

  • Page 9: Video Input Block

    filtering R906, C909. • Energy storing and transferring：Power transformer T901. • Power driving：Power MOS transistor Q901. • 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 •...

  • Page 10: Sync Separator

    The drive o/p pin1 of U401 delivers a drive current of 1.5mA at 5V output through R302 to U402 pin1. 2.3.3 Sync separator: The video input through C401, R401 and filter C402 to pin 5 of U401.The Sync separator is designed such that the slicing level is independent of the amplitude of the Sync pulse. The black level is stored at pin7 by C404.

  • Page 11: Horizontal Deflection Block

    ‧ The DC level across C308 and the current is detected by R306 and feedback to U401 through R311. ‧ The driver output comes from pin5 and it drives the yoke by a negatives slope current ramp R419 is used to stabilize the power amplifier. ‧...

  • Page 12: No Display, (Power Ok)

    up voltage(around 15 to 17.5V), U901 UC3842 will start to work and output 5V at pin 8. If voltage on U601 pin 7 is too low, check and fix following circuits：start up circuit R914, and C914. 3.1.4 If no output pulses at U901 pin 6, check and replace U901. 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.

  • Page 13: Appendix A. Spare Parts List

    Appendix A. Spare Parts List Location F901 D901 D902 D501, D502 D903, D904, D301 D906, D401 Q901 Q201, Q202, Q206, Q402, Q501 Q205 Q502 Q203, Q204 U401 U301 U901 T401 T901 R902 R904 R614 Parts Number 28-1100-0006 06-3100-0005 06-1100-0001 06-1100-0023 06-1100-0014 06-1100-0058 08-3100-0011...

  • Page 14: Appendix B. Schematics And Pcb Layout Diagram

    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...
  • Page 15 Rt/Ct Vref...
  • Page 16 2SC1815 Q203 2.2U/50V C205 C410 .15 C204 10U/16V R211 3.3K R209 120 R306...

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