Tatung C7BTR Series Service Manual Download Page 19

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A7. ADJUSTMENT

FOCUS2

SCREEN

FOCUS1

T44

R47

R83

R32

S801

CRT DRIVE BOARD (Component side view)
PWB-0173

MAIN BOARD (Component side view) PWB

---

0176

S801

---

Power Switch

S516---Control key
R833

---

B+ Adjust

R321

---

HV Adjust

R471

---

ABL Adjust

R482

---

SUB Brightness

Adjust

S51

R48

Summary of Contents for C7BTR Series

Page 1: ...Tatung C7BTR SERIES Low Radiation Extended VGA PLUG PLAY COLOUR MONITOR SERVICE MANUAL...

Page 2: ...s 5 4 Disassembly instructions 7 5 General Connections applications 10 6 Electronic Circuit Description 12 7 Adjustment 24 8 Troubleshooting follow Chart 30 9 Black Diagram 36 10 PCB Layout 37 11 Circ...

Page 3: ...are worn People not so equipped should be kept away while handing picture tube Keep picture tube away from the body while handing 4 The picture tube is constructed to limit X RADIATION to 0 5MR HR at...

Page 4: ...mponents rated for higher voltage wattage etc Before replacing any of these components read the parts list in this manual carefully The use of substitute replacement parts which do not have the same s...

Page 5: ...tical Sync 15 SCL 3 First turn the PC power switch ON Then apply power to the display by pressing the power on off switch to power the monitor on The power indicator light will illuminate Waiting abou...

Page 6: ...Horizontal Scan 30KHz 70KHz continuous Vertical Scan 50 120Hz continuous Video Bandwidth 100MHz User Control Front Select Keys Left and Right Control Keys Down and Up Power ON OFF Power LED Power Powe...

Page 7: ...sec S Vertical Front Porch 0 318 0 381 0 027 0 0264 0 023 msec T V Sync Polarity Interlaced No No No No No Mode No 6 7 8 9 10 Unit Resolution 800 600 1024 768 800 600 1024 768 1024 768 Horizontal Freq...

Page 8: ...the 5V reference voltage on pin8 of I862 and discharge to 1 2V through R861 During the discharge time interval the oscillator generates a series of square waves which cause the output at pin6 of I862...

Page 9: ...Both H sync and V sync are off I501 MODE 40 V 39 H 23 21 D862 LED NORMAL 1 1 1 1 GREEN STAND BY 1 0 0 1 YELLOW SUSPEND 0 1 0 1 YELLOW OFF 0 0 0 0 AMBER When the display signal enters the suspend stat...

Page 10: ...in order to protect the display screen from color impurity The resistance value of the posistor is low 14 ohm during power off Immediately after the display turning on a large AC current flows throug...

Page 11: ...e display will produce a self diagnosis The self diagnosis function is useful to confirm the monitor is working correctly When the signal cable is connected to the computer this pin is low and the pow...

Page 12: ...lanking output on pin12 X ray protection is on pin 25 I401 combined with I330 TDA8172 is a vertical booster to drive the vertical deflection yoke 6 7 Pin Out Description for SGS TDA9111 I401 Pin No Na...

Page 13: ...ical Saw tooth Generator Capacitor 23 V OUT Vertical Ramp Output With frequency independent amplitude and S or C Corrections if any It is mixed with vertical position reference voltage output and vert...

Page 14: ...shift component R424 C427 and D428 and connected pin1 of T430 It combined with DC14 V from Pin2 boosts a sufficient output voltage on pin3 of T430 The snubber network R429 C429 compensates for leakag...

Page 15: ...Q502 any change of DC voltage on the base of Q470 will vary the DC resistance between the collector and emitter of Q470 Low DC resistance on Q470 will cause large width control current flows into Q470...

Page 16: ...spectively The I904 is video output amplifier to amplify the mixed R G and B signal They offer about 38 Vp p signal in amplitude to drive the cathodes of CRT L912 L942 L972 are the peaking coils also...

Page 17: ...6 16 Horizontal Position Raster Circuit The adjustable horizontal raster centering is achieved by using the circuit of D485 D486 and R485 by adjusting P402 in either a DC current element flow in or f...

Page 18: ...will block the H drive output and H V blanking output when the fail safe is activated The protection is reset and return to normal operation either by power off and on or by I2C Dynamic Focus The vert...

Page 19: ...FOCUS1 T44 R47 R83 R32 S801 CRT DRIVE BOARD Component side view PWB 0173 MAIN BOARD Component side view PWB 0176 S801 Power Switch S516 Control key R833 B Adjust R321 HV Adjust R471 ABL Adjust R482 SU...

Page 20: ...ate It indicates a power saving state when it is amber 2 Power Switch Press to power on the monitor press again to power off We recommend to power your system on first 3 Geometric Adjust a Press the s...

Page 21: ...831 16V Is the voltage of R867 normal 1Vpp Is F801 open Check power socket copper and plug D811 D814 R805 Check Q868 I862 D831 R867 Check R849 R848 D870 C831 D831 R831 Q850 D848 Q820 Q821 Q822 Q823 Ch...

Page 22: ...29 of I901 normal Is The voltage at pin 17 ofI901 normal Are the waveforms at cathode R G B of CRT normal Check signal cable C901 C931 C961 Check ABL line from PCB Check D941 I901 is CRT is defective...

Page 23: ...high voltage protection CKT active No raster Check PWM B CKT Q440 Q438 Q439 D442 C435 D435 Open L440 Input 31KHz signal apply 80V DC on Pin 9 of T440 Is defective Reset SCREEN control Check brightnes...

Page 24: ...No Yes Yes Yes Is the waveform at Pin 32 of I501 normal Is the waveform at Pin 40 of I501 normal Loss of vertical synchronization Check I401 Check I501 C328 defective No No Yes Yes 5 Loss of Vertical...

Page 25: ...I330 14V Pin 4 of I330 9V Is the voltage at Pin 7 of I330 normal 1 8V Is the waveform at Pin 23 of I401 normal voltage at Pin 22 of I401 normal Check R347 R348 Check C302 C338 R347 R348 Check C328 I40...

Page 26: ...heck 5V on Pin 5 of I501 Check X510 D506 C506 Check S509 S512 R571 R580 C512 C514 I502 8 MICRO CONTROL FUNCTION ABNORMAL No No Yes Yes H SIZE Is H size control function working Is voltage at the base...

Page 27: ...tors and the degaussing coil b Remove the back cover Fig4 4 grounding connector from the CRT drive shield b Remove CRT drive board from CRT neck Fig4 5 3 PCB Assembly Remove c Unplug the DY connector...

Page 28: ...T c Remove the volume control board from CAUTION Do not lift the CRT by the neck the bezel Fig4 6 7 Woofer Base removal 4 CRT Removal a CRT is supplied as ITC b Remove 4 screws F from the front cover...

Page 29: ......

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