Speco Technologies VM-1201 Vertical Deflection Block, Phase detector, Supply pin9, 10

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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, C406, R405.

2.3.5 Supply (pin9, 10 and 16):

U401 can start operating by application of a very low supply current into pin16. When the starting circuit is taken from pin10 via internal diode, and the voltage on pin16 will stabilize to a typical value of 9.4V

2.3.6Horizontal oscillator, horizontal output transistor, and second phase detector (pin11, 12,

14 and15):

The oscillator is connected to pin15. An external RC; C409, R412, VR401; sets the frequency combination between pin15 and ground. The open collect horizontal output is

connected to pin11. The duty factor is set by an internal npn emitter follower stage connected to pin14. When no flyback pulse is detected at pin12 the duty factor of the horizontal output stage is set to 50%.

2.3.7 Mute output and 50/60HZ identification (pin13):

Pin13 has the possibility for 50/60HZ identification. A pull-high resistor R408 achieves the function.

2.3.8 Sandcastle output (pin17):

The sandcastle output pulse generated at pin17.

2.4Vertical Deflection Block

•Power amplifier：

‧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.

‧Boost power D301, C305 is connected to pin3.

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Contents Model Disclaimer APPENDIX： Spare Parts List Schematics and PCB Layout Diagram Operational Specification Operating EnvironmentSignal Input Requirements Functional SpecificationPower Input Requirements Display Quality Controls and adjustments Physical SpecificationsMain Power Supply Block Video input block Vertical & horizontal processorSupply pin9, 10 Phase detectorVertical Deflection Block Mute output and 50/60HZ identification pin131No Display, No Power Horizontal Deflection Block3No Display No Raster 2No Display, power output normal4Vertical Deflection Failure Appendix A. Spare Parts List FBTAppendix 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.

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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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