Speco Technologies VM-1201 User Manual
SERVICE MANUAL
MODEL
REVISION
DATE
DOCUMENT NUMBER
：
：
：
：
VM-1201
A0
MAY. 21. 2001
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 and specifically disclaims any warranties, merchantability or fitness for any
particular purpose. 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.
Table of Contents
1. INTRODUCTION .......................................................….....…………………………………….. 3
1.1 OPERATIONAL SPECIFICATION ................................…............…………………….……... 3
1.1.1 Operating Environment ...........................................…..………………………………….. 3
1.1.2 Signal Input Requirements ...................................….....…………………….……………. 4
1.1.3 Power Input Requirements ................................…......……………………....…………… 4
1.2 FUNCTIONAL SPECIFICATION...........................…....……………………...............………. 5
1.2.1 Display Quality....................................................………………….………..………….. 5
1.3 CONTROL AND ADJUSTMENTS.........................…....................…………………………... 6
1.4 PHYSICAL SPECIFICATIONS................................….........……………………......………... 7
2.THEORY OF OPERATION..........................................…..…………………….........………….. 7
2.1 MAIN POWER SUPPLY BLOCK......................….....….……………………...............……... 7
2.2 VIDEO INPUT BLOCK ............……….......................…………………….............…………. 7
2.2.1 Video filter………….….…………………………………………………………………. 7
2.3 VERTICAL & HORIZONTAL PROCESSOR 7
2.3.1 Vertical guard……………………………………………………………………………… 7
2.3.2 Vertical Drive Output………..……………………………………………………………. 7
2.3.3 Sync Separator……………………………………………………………………………. 7
2.3.4 Phase Detector…………………………………………………………………………….. 7
2.3.5 Supply……………………………………………………………………………………... 8
2.3.6 Horizontal Oscillator, Horizontal O/P Transistor and Second Phase Detector…………… 8
2.3.7 Mute Output And 50/60 HZ Identification………………………………………………... 8
2.3.8 Sandcastle Output…………………………………………………………………………. 8
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2.4 VERTICAL DEFLECTION BLOCK.........................................……………………..………... 8
2.5 HORIZONTAL DEFLECTION BLOCK.............................……………………............……... 8
3. TROUBLESHOOTING INSTRUCTIONS............................................……………...…….….. 9
3.1 NO DISPLAY, NO POWER.......................…………………………………………………….. 9
3.2 NO DISPLAY, (POWER OK)............………………………………………………………….. 9
3.3 NO DISPLAY, (NO ASTER) ……………………………………………..........…………….. 10
3.4 NO PICTURE OR NO COLOR (RASTERK)..................………………………...…………. 10
3.5 VERTICAL DEFLECTION FAILURE............................................…………………..……….. 10
APPENDIX：
A. SPARE PARTS LIST
B. SCHEMATICS AND PCB LAYOUT DIAGRAM
2
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 operating principles of monitors, as well as technical service and maintenance information.
1. Introduction
The VM-1201, high performance monochrome monitor, display over 1,000 TV lines resolution on a
bright 12-inch picture tube. This combination provides excellent multi-screen displays commonly
produced by picture-in picture and quad units.
All user controls are conveniently located behind a protective front panel door. This monitor can be
placed on a desk or mounted in a standard 12-inch rack (with an optional rack mount kit)
This series are housed in an enameled steel cabinet for ruggedness and durability, and with the exception
of the picture tube, the circuitry is all solid-state. It also feature video loop through connectors with
switchable high-z/75ohm termination.
The VM-1201 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.
1.1 Operational Specification
1.1.1 Operating Environment
‧ Temperature
Operating ：-10 to + 50℃
Storage ：-20 to +70 ℃
‧ Humidity (Relative)
Operating ：10 to 85% non-condensing
Storage ：10 to 95% non-condensing
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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
‧ Input Current at 90 V
AC
Operating：0.5 Amps rms. maximum
‧ Input Current at 264 V
Operating：0.3 Amps rms. maximum
‧ Power consumption
at 50 / 60 ±3Hz
AC
Normal operation：30 Watts maximum
1.2 Functional Specification
The standard conditions for verifying the following specification are as below：
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