Fujitsu 17P4 Schematic

GENERAL INFORMATION

ADJUSTMENT

All adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes several adjustments may be required. Adjustment should be following procedure and after warming up for a minimum of 30 minutes.

• Alignment appliances and tools.

- IBM compatible PC.

- Programmable Signal Generator. (eg. VG-819 made by Astrodesign Co.)

- EPROM or EEPROM with saved each mode data.

- Alignment Adaptor and Software.

- Digital Voltmeter.

- White Balance Meter.

- Luminance Meter.

- High-voltage Meter.

AUTOMATIC AND MANUAL DEGAUSSING

The degaussing coil is mounted around the CDT so that automatic degaussing when turn on the monitor. But a monitor is moved or faced in a different direction, become poor color purity cause of CDT magnetized, then press DEGAUSSING on the OSD menu.

3) EEPROM → ALL CLEAR → Y(Yes) command.

<Caution> Do not run this procedure unless the EEPROM is changed. All data in EEPROM (mode data and color data) will be erased.

4) COMMAND → PRESET START → Y(Yes) command.

5) DIST. ADJ. → TILT & MISCI → TILT command. Adjust TILT as arrow keys to be the best condition.

6) DIST. ADJ. → BALANCE DATA command.

7) Adjust balance of Pin-Balance and Parallelogram correction as arrow keys to be the best condition.

8) DIST. ADJ. → FOS. ADJ command.

9) Adjust H-POSITION as arrow keys to center of the screen.

10) Adjust H-SIZE as arrow keys to 310 ±2mm.

11) Adjust V-POSITION as arrow keys to center of the screen.

12) Adjust V-SIZE as arrow keys to 230 ±2mm.

13) Adjust TRAPEZOID as arrow keys to be the best condition.

14) Save of the Mode.

15) Display from Mode 2 to Mode 10 and repeat above from number 8) to 14).

16) COMMAND→ PRESET EXIT → Y (Yes) command.

ADJUSTMENT PROCEDURE & METHOD

-Install the cable for adjustment such as Figure 1and run

the alignment program on the DOS for IBM compatible PC.

-Set external Brightness and Contrast volume to max position.

1. Adjustment for B+ Voltage.

1) Display cross hatch pattern at Mode 9.

2) Adjust C913 (+) voltage to 190V ±0.2V with VR901.

2. Adjustment for High-Voltage.

1) Display cross hatch pattern at Mode 9.

2) Adjust CDT Anode voltage to 26kV ±0.2kV with

VR701.

3. Adjustment for Horizontal Raster Center.

1) Display cross hatch pattern at Mode 9.

2) Adjust the Back Raster should be center of the screen with SW701.

4. Adjustment for Factory Mode (Preset Mode).

1) Display cross hatch pattern at Mode 1.

2) Run alignment program for FS792E on the IBM compatible PC.

5. Adjustment for White Balance and Luminance.

1) Set the White Balance Meter.

2) Press the DEGAUSSING on the OSD menu for demagnetization of the CDT.

3) Display color 0,0 pattern at Mode 9.

4) COLOR ADJ. → LUMINANCE command of the alignment program.

5) Set Bightness and Contrast to max position.

6) COLOR ADJ. → BIAS ADJ. command of the alignment program.

7) Set the data of Sub-Brightness to 140.

8) Check whether blue color or not at R-BIAS and GBIAS to min position, B-BIAS to 120 (decimal) position.If it's not blue color, the monitor must repair.

9) Adjust Screen control on the FBT to 0.15 ± 0.02FL of the raster luminance.

10)Adjust R-BIAS and G-BIAS command to x=0.283 ±

0.005 and y=0.298 ± 0.005 on the White Balance Meter with PC arrow keys.

11)Adjust Sub-Brightness command to 0.4 ± 0.05FL of the raster luminance.

12) Display color 15,0 box pattern(70x70mm) at Mode 9.

13)DRIVE ADJ → No 1. command.

14) Set B-DRIVE to 100(decimal) position at DRIVE of the alignment program.

15) Adjust R-DRIVE and G-DRIVE command to white balance x=0.283 ± 0.003 and y=0.298 ± 0.003 on the White Balance Meter with PC arrow keys.

16) Adjust SUB-CONTRAST command to 47±1FL of the color 15,0 box pattern (70x70mm) luminance at Mode 9.

17)Save in COLOR 1.

18)Display color 15,0 full white patten at Mode 9.

19)COLOR ADJ. → LUMINANCE → ABL command.

20) Adjust ABL to 33 ± 1FL of the luminance.

21) Exit from the program.

6. Input EDID Data.

1) Display color 15,0 cross hatch pattern at Mode 9.

2) EDID → EDID INFO command.

3) Check EDID data information, if incorrect, you should modify EDID data and saved.

4 EEPROM → BD7W_EDID command and confirm

“EDID Write OK!!” message of monitor.

5) Exit from the alignment program.

6) Power switch OFF/ON for EDID data save.

7. Adjustment for Focus.

1) Display “mE” character in full screen at Mode 6.

(1024x768/85Hz)

2) Adjust two Focus control on the FBT that focus

should be the best condition.

8. Special PRESET Mode Adjustment Method with OSD control.

Service man can adjust preset modes data easily by OSD control key (select/Adjustment) on the monitor without any jig or program.

★Be careful to remember the data before adjustment

because it can’t be recalled.

◆ Following is Adjustment Item.

1) H/V size & H/V position

2) SHAPE (except Tilt)

3) H-Convergence

4) Luminance box pattern (70x70mm) → SCO (Sub-Contrast)

5) Luminance Back-Raster → SBR(Sub-Brightness)

6) Luminance Full-White → ABL (Auto Beam Limit)

◆ Adjustment Procedure.

1) Power on the monitor.

2) First pushing the “set” key and then with keeping the condition push the “power” key. A screen of monitor blinks one time.

3) Check change of symbol (☆→ 󱀕) that displays on left below in the OSD window.

4) Select adjustment item 1), 2) and 3), adjust using set/ adjustment key for preset mode save.

5) Select “DEGAUSS” in the special menu for luminance adjustment item 4), 5) and 6).

* Before the luminance adjustment, set the max

position for extermal BRIGHTNESS & CONTRAST and white color balance must be color 9300K.

6) Select SCO, SBR and ABL, adjust at mode 9. Following are adjustment procedures using set/ adjustment key.

① SBR(Sub-Brightness): Back-Raster → 0.4FL ②

SCO(Sub-Contrast):Window luminance → 47FL (Box pattern)

③ ABL(Auto Beam Limit): Full White → 33FL

7) After adjustment, set power switch off → on and the symbol (󱀕) of OSD window disappeare.

POWER INPUT

.Free voltage: 100~240VAC

(50/60Hz)

.PFC version: 200~240VAC

(50Hz)

Line Filter

Degaussing Circuit

< OSD Control >

SMPS

TRANS

(T901)

SMPS CONTROL (IC901)

DPM

CONTROL

CIRCUIT

190V

-12V

80V 15V 12V

6.3V

TILT

Control Circuit

6.3V

12V

E2PROM

H-Convergence

Control

Circuit

PURITY

Control

Circuit

(IC402)

H / V POSITION H / V SIZE SPCC TRAPIZODE PIN BALANCE PARALLELOGRAM TILT TOP/BOTTOM CORNER RECALL DEGAUSS COLOR CONTROL H/V MOIRE H-CONVERGENCE LANGUAGE INFORMATION VIDEO LEVEL OSD POSITION PURITY BRIGHTNESS CONTRAST

OSD IC (IC301)

H-Sync Sig V-Sync Sig

I2C DATA(SDA) I2C CLOCK(SCL)

VIDEO PRE-AMP (IC302)

Signal Cable

R G B

VIDEO MAIN AMP (IC303)

CUT OFF

CONTROL IC

(IC304)

80V

12V12V 5V

H/V Sync Processor

( IC701 )

TDA9113

V-OUT

( IC601)

TDA8172

H-OUT

( Q708)

H-Linearity

Correction

DC/DC Converter

X-RAY

Protection

Circuit

FBT

( T701 )

Dynamic

Focus Circuit

Auto Beam Limit

Vertical Blanking,

Brightness Control

-150V

30V

400V

H.V

CONTROL

(IC702)

DUMMY

TRANS

12V

12V 15V

15V

MICOM (IC401)

SCL / SDA

H/V Sync,

PWM Control

Sig

12V

15V

12V

-12V

190V

DY CDT

Heater ( 6.3V )

I2C

H/V

Sync

G 1

Screen

Dynamic Focus

Static Focus

H.V

R/G/B

Bias

R/G/B

Contrast

H-DRV

B-DRV

15V

PURITY

COIL

ILT

COIL

DEGAUSSING

COIL

I2C

VOLTAGE

FEEDBACK

B-DRV Circuit

DESCRIPTION OF BLOCK DIAGRAM

1. Line Filter & Associated Circuit.

This is used for suppressing noise of power input line flowing into the monitor and/or some noise generated in this monitor flowing out through the power input line. That is to say, this circuit prevents interference between the monitor and other electric appliances.

2. Degauss Circuit & Coil.

The degauss circuit consists of the degaussing coil, the PTC (Positive Temperature Coefficient) thermistor (TH901), and the relay (RL901). This circuit eliminates abnormal color of the screen automatically by degaussing the slot mask in the CDT when turn on the power switch. When you need to degauss while using the monitor, select DEGAUSS on the OSD menu.

3. SMPS (Switching Mode Power Supply).

This circuit works with power of 100~240V or 200~240V (50/60Hz) specially for PFC version.

The operation procedure is as follows:

5. X-ray Protection.

This circuit detects the rectified DC voltage comes from the FBT pin 4. If the high voltage of the FBT reaches up to about 30kV (abnormal state), H.V control (IC702) detects. It stops B+voltage supplied to the FBT (T701), and high voltage is not be generated, (In the normal state, the high voltage is about 26kV.)

6. Micom(Microprocessor) Circuit.

The operating procedure of Micom (Microprocessor) and its associated circuit is as follows:

1) H and V sync signal is supplied from Signal Cable to t h e Micom (IC401).

2) The Micom (IC401) distinguishes polarity and frequency of H and V sync.

3) The Micom controls each OSD function signals. (H-size, H-position, V-size, etc.)

4) The controlled data of each mode is stored in IC402 (EEPROM). User can adjust screen condition by each OSD function. The data of the adjust screen condition is stored automatically.

1) AC input voltage is rectified and smoothed by the bridge diode (D901) and the capacitor (C907).

2) The rectified voltage (DC voltage) is applied to the primary coil of the transformer (T901).

3) The control IC (IC901) generates switching pulse to turn on and off the primary coil of the transformer (T901) repeatedly.

4) Depending on the turn ratio of the transformer, the secondary voltages appear at the secondary coil of the transformer (T901).

5) These secondary voltages are rectified by each diode (D906, D907, D928, D912, D913) and operate the other circuits. (Deflection, Video Amplifier, etc.)

4. Display Power Management Circuit.

This circuit control power consumption of the monitor by detecting H and V sync signal. There are stand-by and suspend mode. When no horizontal or vertical sync signal input, the circuit consists of Q904, Q905 becomes stand-by and suspend mode. It’s power consumption is below 8W. When no horizontal and vertical sync signal input, it’s power consumption is below 3W.

7. Horizontal and Vertical Synchronous Processor.

This circuit generates the horizontal drive pulse and the vertical drive pulse by taking sync-signal from Signal Cable. This circuit consists of the TDA9113(IC701) and the associated circuit.

8. Oscillating Circuit for D/D Converter.

This circuit generates the pulse wave which has the horizontal period by taking the output of the TDA9113 (IC701).

9. D/D (DC to DC) Converter.

This circuit supplies DC voltage to the horizontal deflection output circuit by decreasing DC 190V which is the secondary voltage of the SMPS in accordance with the input horizontal sync signal.

10. Side-Pincushion Correcting Cirucit.

This circuit improves the Side-pincushion of the screen by mixing east-west wave to the output of the horizontal deflection D/D converter which is used for the supply voltage source (B+) of the deflection circuit.

11. D/D Drive & Convert Circuit.

19. Image Rotation (Tilt) Circuit.

This circuit is used for supplying B+voltage to horizontal deflection output transistor (Q708). This circuit makes to add side-pincushion correcting signal to B+voltage.

12. Horizontal Deflection Output Circuit.

This circuit makes the horizontal deflection by supplying the saw-tooth current to the horizontal deflection yoke.

13. High Voltage Output & FBT (Flyback Transformer).

The high voltage output circuit is used for generating pulse wave to the primary coil of the FBT (Flyback Transformer (T701)). A boosted voltage (about 26kV) appears at the secondary of the FBT and it is supplied to the anode of the CDT. And there are another output voltages such as the dynamic focus voltage.

14. H-Linearity Correction Circuit.

This circuit corrects the horizontal linearity for each horizontal sync frequency.

15. Vertical Output Circuit.

This circuit takes the vertical wave from the TDA9113 (IC701) and performs the vertical deflection by supplying the saw-tooth wave current from the TDA8172 (IC601) to the vertical deflection yoke.

17. Dynamic Focus Output Circuit.

This circuit takes H and V parabola wave from the TDA9113 (IC701), and amplifies these waves to offer to the FBT (T701).

This circuit corrects the tilt of the screen by supplying the image rotation signal to the tilt coil which is attached to the CDT near the deflection.

20. Static Convergence Control Circuit.

This circuit corrects the convergence of the screen by supplying the convergence signal to the 4H (STC) coil which is attached to the CDT near the deflection.

21. Moire Reduction Circuit

This circuit reduce interference between the periodical display pattern and the CDT's slot (or dot). The positions of every other one dot video signal beams (red, green, and blue beam) are shifted finely, thus reducing interference.

22. OSD Circuit.

This circuit is used for performing the OSD (OnScreen- Display) function. When a user selects the OSD Select/Adjustment control, the adjustment status displays on the screen.

23. Video Pre-Amp Circuit.

This circuit amplifies the analog video signal from 0-

0.7V to 0-4V. This circuit is operated by taking the clamp, R, G, B drives, and contrast signals from the Micom (IC401).

24. Video Output Amp Circuit.

This circuit amplifies the video signal which comes from the video pre-amp circuit and amplified video signal is applied to the CDT cathode.

18. H &V Blanking and Brightness Control.

This circuit eliminates the retrace line by supplying a negative pulse to the G1 of the CDT. The brightness control circuit is used to control of the screen brightness by changing the DC level of G1.

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