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MODEL

：

VM-901B

REVISION

：

A0

DATE

：

MAY. 21. 2001

DOCUMENT NUMBER

：

SERVICE MANUAL

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Summary of Contents for VM-901B

Page 1: ...MODEL VM 901B REVISION A0 DATE MAY 21 2001 DOCUMENT NUMBER SERVICE MANUAL 1...

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: ...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 connector with switcha...

Page 5: ...l 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 VAC at 50 60 3Hz Input Current at 90 VAC Operating 0...

Page 6: ...0 VAC 10 50 60 3Hz Warm up Time 30 minutes min after power on and signal applied Ambient light 400 to 600 lux 1 2 1 Display Quality Display area monoscope pattern full scan Video Amplifier Performance...

Page 7: ...from eyes to screen Focus viewed at 50cm 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 patter...

Page 8: ...ol Power switch AC to DC conversion and filtering Diode D901 Capacitor C906 Start up circuit R914 C914 Main switching power controller free run oscillation voltage feed back switching duty control cyc...

Page 9: ...Q201 R201 R202 Video filter output stage Video input Through C202 to W202 Contrast VR and differential amplifier Q202 Q203 Video amplifier Cascade amplifier R219 Q204 Q205 R222 C206 Brightness contro...

Page 10: ...rrent 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 transi...

Page 11: ...aveform to drive the Q401 MOS FET Horizontal deflection Horizontal Output transistor Q401 Load Yoke inductance and C414 D401 High Voltage generation flyback transformer 3 Troubleshooting Instructions...

Page 12: ...916 3 2 2Check driving output voltage 0 or very low check and replace Q402 Q401 3 2 3Power off monitor Check yoke connection Use multimeter to check D501 D502 D401 Fix if any is bad 3 2 4Power on chec...

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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