Speco Technologies VM-1201 service manual Horizontal Deflection Block, 1No Display, No Power

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•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.

2.5Horizontal Deflection Block

•Horizontal drive buffering：Driving source-U401 pin11. Driving transistor-Q40, to pull high the driving waveform to drive the Q401(MOS FET).

•Horizontal deflection：Horizontal Output transistor-Q401; Load-Yoke inductance and C414 ; D401, High Voltage generation-flyback transformer .

3Troubleshooting Instructions

‧This chapter describes possible failures of the monitor with corresponding check/correction actions, and guidelines for safe operation and service of the monitor.

3.1No Display, No Power

3.1.1First of all, turn power off, use multimeter to check Q901, and R904, replace if bad. Turn power on after that.

3.1.2Check DC voltage across C906. If no voltage or voltage too low, check and fix the following components：AC receptacle poor contact, fuse F601 broken, power switch malfunction, or bridge diode D901 bad

3.1.3Check voltage on U901 pin 7 for start up condition：If voltage on U901 pin 7 reaches the start 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.

3.1.4If no output pulses at U901 pin 6, check and replace U901.

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Contents Model Disclaimer APPENDIX： Spare Parts List Schematics and PCB Layout Diagram Operating Environment Operational SpecificationPower Input Requirements Functional SpecificationSignal Input Requirements Display Quality Physical Specifications Controls and adjustmentsMain Power Supply Block Vertical & horizontal processor Video input blockMute output and 50/60HZ identification pin13 Phase detectorVertical Deflection Block Supply pin9, 10Horizontal Deflection Block 1No Display, No Power4Vertical Deflection Failure 2No Display, power output normal3No Display No Raster FBT Appendix A. Spare Parts ListAppendix B. Schematics and PCB Layout Diagram VR Board VM-901B/1201/1501B W/AUDIO Main Board

VM-1201 specifications

Speco Technologies is known for its commitment to providing high-quality surveillance solutions, and the VM-1201 is no exception. This innovative video monitor is designed to meet the needs of modern security systems while offering impressive features that enhance both performance and usability.

One of the standout characteristics of the VM-1201 is its 12-inch display, which provides clear and crisp video footage. This size strikes an excellent balance, making it suitable for various applications, whether for personal use, business security, or monitoring large areas in a facility. The monitor supports various video inputs, allowing users to connect multiple cameras and display them simultaneously. This versatility is particularly beneficial for security personnel who require real-time monitoring of multiple feeds.

Another key feature of the VM-1201 is its high-resolution display, which ensures that every detail is captured and displayed accurately. This is critical in a surveillance context where identifying individuals or assessing situations can depend on clarity. The monitor is equipped with advanced technologies that enhance image quality, such as brightness and contrast adjustments, ensuring optimal performance in various lighting conditions.

In terms of design, the VM-1201 is sleek and space-efficient, making it easy to integrate into any environment. The durable construction means it can withstand the rigors of continuous operation, making it a long-lasting addition to a surveillance system. Its flexible mounting options allow users to position the monitor in a way that best suits their monitoring needs, whether on a desktop, wall-mounted, or stand-alone.

Furthermore, the VM-1201 is user-friendly, featuring an intuitive interface and accessible controls that simplify operation. Quick access to settings and adjustments ensures that users can customize their viewing experience to align with their specific requirements.

Overall, the Speco Technologies VM-1201 combines exceptional performance, advanced technologies, and practical features that cater to the demanding needs of the security industry. Whether used in homes, retail environments, or corporate settings, this monitor delivers reliable and high-quality video monitoring solutions, making it a valuable asset for professionals and security enthusiasts alike. Its blend of functionality, durability, and user-centric design solidifies its position as a leading choice in video surveillance technology.
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