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MODEL

：

VM-1201

REVISION

：

A0

DATE

：

MAY. 21. 2001

DOCUMENT NUMBER

：

SERVICE MANUAL

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Summary of Contents for VM-1201

Page 1: ...MODEL VM 1201 REVISION A0 DATE MAY 21 2001 DOCUMENT NUMBER SERVICE MANUAL...

Page 2: ...o 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 Req...

Page 3: ...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 APPENDI...

Page 4: ...nd 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...

Page 5: ...pedance 75 ohms 1 1 3 Power Input Requirements Operating Voltage Range 90 264 VAC at 50 60 3Hz Input Current at 90 VAC Operating 0 5 Amps rms maximum Input Current at 264 V Operating 0 3 Amps rms maxi...

Page 6: ...pplied Ambient light 400 to 600 lux 1 2 1 Display Quality Display area monoscope pattern full scan Video Amplifier Performance Video Bandwidth 8 MHz Light output brightness and contrast at maximum At...

Page 7: ...m from eye to screen contrast adjusted to set luminance at 20 FL with full white pattern brightness set at raster just disappeared Inspect full character pattern all characters should be distinguished...

Page 8: ...tart up circuit R914 C914 Main switching power controller free run oscillation voltage feed back switching duty control cycle by cycle over current protection power MOSFET driving U901 UC3842 Free run...

Page 9: ...R214 R225 R226 Q204 2 3 Vertical horizontal processor 2 3 1 Vertical guard This vertical feedback signal on pin2 when the level on pin 2 is below 0 35v or high than 1 85v the guide circuit inserts a...

Page 10: ...n 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 followe...

Page 11: ...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 repla...

Page 12: ...n Use multimeter to check D501 D502 D401 Fix if any is bad 3 2 4Power on check voltage at pin10 of U401 if no voltage check and fix Vertical circuit B D904 3 3No Display No Raster 3 3 1Check yoke conn...

Page 13: ...901 08 3100 0011 Power MOS 2SK2996 Q201 Q202 Q206 Q402 Q501 08 1100 0003 Transistor NPN 2SC1815 Q205 08 1100 0001 Transistor NPN 2SC2688 Q502 08 1100 0002 Transistor PNP 2SA1015 Q203 Q204 08 1100 0081...

Page 14: ...x 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 Sc...

Page 15: ...1 6 5 8 7 11 12 T901 ERL 35 D902 BA159 GND 5 VC 7 COMP 1 Vfb 2 Vref 8 Rt Ct 4 OUT 6 Ise 3 U901 IC3842 D905 1N4148 R905 18 R906 1K C908 472 1KV G S D Q901 2SK2996 R904 39 C909 1000P C912 104 50V R909...

Page 16: ...2U R405 1 2K C308 1000U 25V R306 1 8 1W 1 2 W201 VIDEO IN R228 1K C201 47U 16V Q201 2SC1815 R203 470 R202 15K R201 12K C202 220U 16V 1 2 3 4 5 6 7 8 W504 Q204 2SC1815 R219 330 C206 C560P 100V R510 1 2...

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