Gateway VX900T Service Manual
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Gateway VX900T Service Manual

With d98 chassis
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SERVICE MANUAL
Picture tube
0.25-0.27 mm aperture grill pitch
19 inches measured diagonally
90-degree deflection
Video image area
(18" maximum viewing image)
Approx. 365 X 274 mm (w/h)
3/8
(14
x 10
Resolution
Horizontal: Max. 1600 dots
Vertical: Max. 1200 lines
Standard image area
Approx. 352 x 264 mm (w/h)
(13
7/8
x 10
Input signal
Video
Analog RGB (75 ohms typical)
0.7 Vp-p, Positive
Sync
External HD/VD, Composite
Polarity Free TTL
Video Composite (Sync on Green)
0.3 Vp-p, Negative
SPECIFICATIONS
Power Consumption
Deflection frequency
7/8
inches)
AC input voltage / current
Dimensions
1/2
inches)
Mass
Design and specifications are subject to change without notice.
— 1 —
VX900T
Canadian Model
Chassis No. SCC-L20F-A
D98
Maximum
130 W
Nominal
100 W
Horizontal: 30 to 96 KHz
Vertical: 48 to120 Hz
100 to 120 V, 50/60 Hz, 1.7A
220 to 240V, 50/60Hz, 1.2A
444 x 467 x 455 (w/h/d)
(17
1/2
x 18
Approx. 26 kg (57 lb 5 oz)
COLOR MONITOR
VX900T
VX900T
US Model
CHASSIS
1/2
x 18 inches)

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  • Page 1 VX900T VX900T SERVICE MANUAL VX900T US Model Canadian Model Chassis No. SCC-L20F-A CHASSIS SPECIFICATIONS Power Consumption Picture tube 0.25-0.27 mm aperture grill pitch Maximum 19 inches measured diagonally 130 W Nominal 90-degree deflection 100 W Deflection frequency Video image area (18"...
  • Page 2 VX900T POWER SAVING FUNCTION If no video signal is input to the monitor, the NOTE: This monitor has three Power Saving modes. "NO INPUT SIGNAL" message appears. After By sensing the absence of a video signal from the about 30 seconds, the Power Saving function...
  • Page 3 VX900T SAFETY CHECK-OUT After correcting the original service problem, perform LEAKAGE TEST the following safety checks before releasing the set to the The AC leakage from any exposed metal part to earth ground customer: and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampere).

  • Page 4: Table Of Contents

    VX900T TABLE OF CONTENTS Section Title Page 1. GENERAL ................... 5 2. DISASSEMBLY 2-1. Cabinet Removal ............11 2-2. Service Position .............. 11 2-3. D, A, H and N Board Removal........11 2-4. Picture Tube Removal ........... 12 3. SAFETY RELATED ADJUSTMENT .........

  • Page 5: General

    SECTION 1 The instructions given here are partial abstracts from the Operating Instruction Manual. The page numbers shown reflect those of the Operating Instruction Manual. GENERAL Getting Started Getting Started Setup Table of Contents Connect the monitor to your computer system. Precautions .
  • Page 6 Getting Started Customizing Your Monitor Customizing Your Monitor The OSD (On-screen Display) System Use of the Tilt/Swivel Adjusting the Picture Brightness and Contrast This monitor can be adjusted within the angles shown below. To 3 If necessary, use the BRIGHTNESS buttons to select a specific turn the monitor vertically or horizontally, hold it at the bottom with Introducing the OSD System (BRIGHTNESS) v/V or 6 (CONTRAST)
  • Page 7 Customizing Your Monitor Customizing Your Monitor 3 Adjusting the shape of the 5 Adjusting the color of the picture 6 Adjusting the quality of the Adjusting the Settings picture (GEOM) (COLOR) picture (CONV) 1 Adjusting the centering of the The COLOR settings allow you to adjust the picture’s color The CONV settings allow you to adjust the quality of the picture by The GEOMETRY settings allow you to adjust the rotation and picture (CENTER)
  • Page 8 Customizing Your Monitor Customizing Your Monitor 9 Using the GRAPHIC Resetting the adjustments Degaussing the monitor Note • Before using this feature, the monitor must be in normal operation mode The monitor is automatically degaussed (demagnetized) when the ENHANCEMENT OSD (Green power indicator) for at least 30 minutes.
  • Page 9 • The computer is in power saving mode. Try pressing any key on the computer keyboard. INFORMATION Damper wires • Check that the computer’s power is “on.” MODEL : CPD VX900T • Check that the graphic video board is completely seated in the proper bus slot. SER NO : 1234567 MANUFACTURED : 1998-53...
  • Page 10 Additional Information Symptom Check these items Picture is fuzzy • Adjust the brightness and contrast (page 5). • Degauss the monitor* (page 9). • If CANCEL MOIRE is ON, the picture may become fuzzy. Decrease the moire cancellation effect (page 9) or set CANCEL MOIRE to OFF. Picture is ghosting •...

  • Page 11: Disassembly

    VX900T SECTION 2 DISASSEMBLY 2-1. CABINET REMOVAL 2-2. SERVICE POSITION Two claws PUSH H board Cabinet (additional board) PUSH A board D board 1 When the D-board is Two screws placed in service (BVTP 4 x 16) position, the Safety Earth Wire (green and yellow wire) is disconnected.

  • Page 12: Picture Tube Removal

    VX900T 2-4. PICTURE TUBE REMOVAL Demagnetization coil Two screws (BVTP 4 x 16) Tension spring A board Neck assy Deflection yoke Four screws (Tapping screw 5) Stand assy (D board) Picture tube shield Anode cap Cushion REMOVAL OF THE ANODE-CAP NOTE: Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield or carbon painted on the CRT, after removing the anode.

  • Page 13: Safety Related Adjustment

    VX900T SECTION 3 SAFETY RELATED ADJUSTMENT b) HV Hold-Down Check When replacing parts shown in the table below, the 1) Using an external DC Power supply, apply the voltage following operational checks must be performed as a shown below between cathode of D908 on "D" Board safety precaution against X-ray emissions from the unit.

  • Page 14: Adjustments

    VX900T SECTION 4 ADJUSTMENTS Connect the communication cable of the connector located on the D board on the monitor. Run the service software and then follow the instructions. 1-690-391-21 A-1500-819-A 3-702-691-01 Interface Unit Connector Attachment IBM AT Computer To BUS CONNECTOR...
  • Page 15 VX900T Receive White cross-hatch. Convergence Specification Adjust HMC and VMC at six-pole magnet. < 6 Pole Magnet> Horizontal and Vertical 0.25mm 0.24mm 0.30mm 0.30mm C < 0.35mm Focus adjustment Receive R.B. cross-hatch. Adjust focus (V) and focus (H) for optimum focus.
  • Page 16 VX900T NOTES: — 16 —...
  • Page 17 VX900T NOTES: — 17 —...
  • Page 18 VX900T NOTES: — 18 —...

  • Page 19: Circuit Boards Location

    VX900T 5-2. CIRCUIT BOARDS LOCATION 5-3. SCHEMATIC DIAGRAMS AND PRINTED WIRING BOARDS Note: • All capacitors are in µF unless otherwise noted. pF: µµF • When replacing parts shown in the table below, 50 WV or less are not indicated except for electrolytic.
  • Page 20 CN101 (2/2) CN801 (2/2) F U N C G N D . A S 2 0 0 1 - S 2 0 0 8 (FUNC CTRL) (MICRO, DSP) G N D KEY SCAN1 K E Y S C A N 1 P O W E R LED1 L E D 1...
  • Page 21 1 2 V D311 +12V CN313 (VIDEO) 1PS226-115 STBY+5V :PROT R 0 3 0 J001 1 0 0 :S-MICRO S T B + 5 V : C H I P IC002 C 3 5 2 R 3 3 0 LM2403 1 0 0 B.GND1 1 6 V...
  • Page 22 A BOARD WAVEFORMS 4.37V 4.37V 4.66V 52.50V 38.44V 38.75V 38.13V 48.13V 51.88V 100.0 VDC above GND 0.76V 0.76V 0.76V...
  • Page 23 D GND KEY SCAN KEY SCAN CN901 IIC CLK IIC CLK R903 5V-2 :S-MICRO C929 IIC DATA IIC DATA R904 1000p B:CHIP DDC 5VDET 5V-2 5V-2 5V-2 SERVICE R940 IC903 D940 2.7k JW(5MM) NMJ78L05A S901 IC701 DDCSCL CXA8070P CONTRAST+ CONV.CONTROL TEST D901 (POWER DEFLECTION)
  • Page 24 D BOARD WAVEFORMS 1.36V 128.8V 1.1KV 10.81V 59.38V 11.19V 13.06V 1.42V 8.25V 11.09V 0.05 ~ 0.7V 0.05 ~ 0.2V...
  • Page 25 TO D BOARD CN1001 C2020 R2019 1000p 2.7k D2001 339VYUGW/R2 R2020 S2001 R2021 BRIGHT+ R2018 S2002 CONT- R2017 CONT+ R2016 S2003 BRIGHT- R2015 S2004 CN2003 MENU R2014 S2005 S602 POWER SWITCH R2013 2.2k TO D BOARD CN603 R2012 4.7k S2007 INPUT SELECT R2011 S2008...
  • Page 26 TO A BOARD CN309 TO A BOARD CN306 & CN311 CN1004 CN1003 :S-MICRO R1010 :CHIP INPUT SW INPUT SW R1054 1.0k :CHIP R1084 R1085 R1086 R1044 BP CLAMP R1089 PCB PIN NUMBERS C.SYNC R1083 :CHIP :CHIP :CHIP :CHIP :CHIP IICCLK R1090 (MICRO, DSP) IICDATA...
  • Page 27 N BOARD WAVEFORMS 3.38V 3.56V (8MHz) 5.03V 5.00V 3.25V...

  • Page 28: Semiconductors

    VX900T 5-4. SEMICONDUCTORS LA6500-FA MS278FP UPC4558G2 2SC2611 2SA1162-G UPC5021-109 2SC5022-02 NJM78M05FA LA6510 24LC21AT 2SC1623-L5L6 PC123F2 36 pins IRFU110A IRFIBC44LCLF65 FMC-26UA 1RF19634G-LF35 2SC5022-02 1RL1530GSLF33 FS7KM-18A-AY 2SK2098-01MR-F119 D2L40-TA D4L20U FMQ-G5FMS GBU4JL-6088 PST574CMT-T1 STV5109 TDA8177 CXD8768Q CXD8766S/JBK CAT24WC16J-TE13 TDA8138A TLV2262IDR 1SS119-25 MTZJ-39B 1PS226-115 MTZJ-6.2B...

  • Page 29: Exploded Views

    VX900T SECTION 6 EXPLODED VIEWS Note: • • Items with no part number and no descrip- Items marked " " are not stocked tion are not stocked because they are sel- since they are seldom required for routine The components identified by shading dom required for routine service.

  • Page 30: Packing Materials

    VX900T 6-2. PACKING MATERIALS REF.NO. PART NO. DESCRIPTION REMARK REF.NO. PART NO. DESCRIPTION REMARK REF.NO. PART NO. DESCRIPTION REMARK 51 * 3-865-779-12 MANUAL, INSTRUCTION 52 * 4-067-845-11 CUSHION (UPPER) 53 ¡ 1-783-835-11 CORD SET, POWER 54 * 4-041-927-11 BAG, POLYETHYLENE...

  • Page 31: Electrical Parts List

    VX900T SECTION 7 ELECTRICAL PARTS LIST The components identified by [ in this manual RESISTORS Note: • have been carefully factory-selected for each All resistors are in ohms set in order to satisfy regulations regarding X- REF.NO. PART NO. DESCRIPTION...
  • Page 32 VX900T Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 33 VX900T Note: Note: The components identified by shading Les composants identifies per un trame and mark ¡ ¡ ¡ ¡ ¡ et une marque ¡ ¡ ¡ ¡ ¡ sont critiques pour la are critical for safety. Replace only with part number specified.
  • Page 34 VX900T Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 35 VX900T Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 36 VX900T Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 37 VX900T Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 38 VX900T Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 39 VX900T The components identified by [ [ [ [ [ in this manual have been Note: The components identified by shading carefully factory-selected for each set in order to satisfy and mark ¡ ¡ ¡ ¡ ¡ are critical for safety.
  • Page 40 VX900T Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 41 VX900T REF.NO. PART NO. DESCRIPTION REMARK REF.NO. PART NO. DESCRIPTION REMARK C1027 1-164-004-11 CERAMIC CHIP 0.1MF FB2103 1-412-911-31 FERRITE C1028 1-126-935-11 ELECT 470MF 6.3V FB2104 1-412-911-31 FERRITE C1029 1-163-021-91 CERAMIC CHIP 0.01MF FB2105 1-412-911-31 FERRITE C1030 1-164-004-11 CERAMIC CHIP 0.1MF...
  • Page 42 VX900T Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 43 VX900T NOTES: REF.NO. PART NO. DESCRIPTION REMARK REF.NO. PART NO. DESCRIPTION REMARK — 53 —...
  • Page 44 VX900T NOTES: REF.NO. PART NO. DESCRIPTION REMARK REF.NO. PART NO. DESCRIPTION REMARK — 54 —...
  • Page 45 VX900T REF.NO. PART NO. DESCRIPTION REMARK REF.NO. PART NO. DESCRIPTION REMARK — 55 —...
  • Page 46 VX900T REF.NO. PART NO. DESCRIPTION REMARK REF.NO. PART NO. DESCRIPTION REMARK English 97KJ74015-1 Printed in U.S.A. 9-978-872-01 © 1998.11 — 56 —...
  • Page 47 VX900T VX900T SERVICE MANUAL VX900T US Model Canadian Model Chassis No. SCC-L20F-A CHASSIS CORRECTION -1 Subject: Digital Convergence Adjustment Correct the service manual as shown. File this correction with the service manual. COLOR MONITOR...
  • Page 48 VX900T Section 4 Adjustments (Page 15) Step 4 Digital Convergence Adjustment Set CONV_SWITCH_NDX to 3 Step 1 Adjust area "A" as follows: Adjust area "03" - "83" with the following register: "X DYNAMIC CONV RX03" - "X DYNAMIC CONV RX83"...

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