Kristel 1428-30k series Service Manual

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S E R V I C E M A N U A L

Color Monitors

1428 - 30K Series

Produced by M.M

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Summary of Contents for Kristel 1428-30k series

Page 1 S E R V I C E M A N U A L Color Monitors 1428 - 30K Series Produced by M.M Copyright 1997...
Page 2: Input Signals
COLOR DATA DISPLAY by KRISTEL, ISO-9001 CERTIFIED 1428 - 30K series COLOR SPECIFICATIONS • From 10” to 28” diagonal measure • P22 phosphor • Polished faceplate standard (dark - tint, light transmission: 57%, none glare, deflection angle 90 degree, dot pitch: 0.28 - 0.82. Optional finer pitches available.
Page 3: Product Safety Notice
1428-30k series MECHANICAL • The 14” monitor is also available in universal mount brackets. The monitor can be mounted in the user’s cabinet horizontally or vertically. • All the models are available also as a kit - without a frame. Custom frames can be fur- nished also available in the chassis form adaptable to individual customer requirements.
Page 4: Safety Precaution
1428-30k series SAFETY PRECAUTION NOTICE: Comply with all cautions and safety related notes located on or inside the chassis or picture tube. The following precautions should be observed: 1.The design of this product contains special hardware, many circuits and components especially for safety purposes.
Page 5 1428-30k series IMPORTANT Do not check high voltage by drawing an arc. Use a high voltage meter or a high voltage probe with a digital voltage meter. When service is required, observe the original lead dress. Extra precaution should be given to assure correct lead dress in high voltage circuit area.
Page 6: Power Supply
1428-30k series MAIN PCB, 1428-30K Video power connector B503 VR601, H-Hold LED,power indic. Sync.connector Hsize, B302 Vcenter, B303 VR602, X-Ray VERT. SEC. ⇒ POWER SUPPLY VR308, sub-H-size Hphase & Vsize - B601 SYNC.SECTION VR310, V-Lin. Yoke, B602A VR304, Gain -Tunning cap.C611...
Page 7 1428-30k series MAIN PCB, 1428-30K Video power connector B503 VR601, H-Hold LED,power indic. Sync.connector Hsize, B302 Vcenter, B303 VR602, X-Ray VERT. SEC. ⇒ POWER SUPPLY VR308, sub-H-size Hphase & Vsize - B601 SYNC.SECTION VR310, V-Lin. Yoke, B602A VR304, Gain -Tunning cap.C611...
Page 8 1428-30k series VIDEO PCB CONNECTION INFORMATION & PRINCIPAL SECTIONS AREA R,B - Drive/Gain adj. R, G, B - bias adj. LM1203 PREAMPLIFIER R236 clamp CIRCUIT R251 R233 R208 R286 HEATER Resistor Load Resistors contrast conn CRT socket video conn. Blanking, from GND,V &...
Page 9: Crt Board
1428-30k series /AB VIDEO PCB - ABNO2CX /autobias/ INFORMATION & PRINCIPAL SECTIONS AREA R236, R230 & R233 / LOAD RESISTORs IC202 , BIAS CONTROL PROCESSOR green wire: GP IC203, BEAM CURRENT CRT socket / large BUFFER or small neck white wire: VR...
Page 10: Overview Of Operation
1428-30k series, AUTO BIAS AUTOMATIC BIASING VIDEO SYSTEM PURPOSE The purpose of the system is to establish and maintain a constant and correct black level (cutoff level) on the CRT screen, without the need for manually adjusting the biasing of the individual video amplifiers.
Page 11 1428-30k series, AUTO BIAS...
Page 12 1428-30k series PURPLE: Power Supply Section GREEN: Horizontal Output Section RED: Sync.Processing Section YELLOW: HV Section (FBT) BLUE: Vertical Section CORAL: Electronic Width Control TOP OVERLAY KRISTEL / 100-100-1428-30K pg.7...
Page 13 1428-30k series SCHEMATIC DIAGRAM CRT BOARD model: 200-200—1564 USED IN CONJUNCTION WITH 1428-30k pcb To B801 main PCB TO B503, main PCB B211 to B901 main PCB G1 ABL GND NOTE All marked area with red square is subject to be changed accordingly with the model of the CRT and the characteristics of the deflection yoke existing on the CRT.
Page 14: Block Diagram
1428-30k series BLOCK DIAGRAM 100-100-1428-30K OPTIONAL for AUTOBIAS HORIZONTAL YOKE 110 - 240 vAC CHARACTERISTICS of potentiometers: NOT USED in AB configuration REMOTE CONTROL BLOCK / SIX CONTROLS or FIVE CONTROLS (AB) pg.9 Hsize=VR307=5Kohm; Vsize=VR309=10Kohm; Contrast=VR201=10Kohm Vcent=VR302=5Kohm; Hphase=VR604; Brightness=VR901=100kohm...
Page 15: Power Supply - Circuit Description
1428-30k series POWER SUPPLY - CIRCUIT DESCRIPTION / guide for switching power supply and components. 1.POWER CIRCUIT FUNCTIONAL BLOCK DIAGRAM Switching Power Supply The power circuit includes the lines filter, input rectifier circuit, start up, current-mode control and OVP. Please refer to the circuit diagram.
Page 16 1428-30k series 1.1 LINE FILTER CIRCUIT The line filter circuit is comprised of C501, C502 and L501. This line filter tends to reduce the noise of con- ducted EMI from monitor into the power line. 1.2 INPUT RECTIFIER CIRCUIT The input rectifier circuit is comprised of BD501 and C505. BD501 and C505 is a full - wave mode rectifier.
Page 17 1428-30k series 2. SYNCHRONOUS PROCESSING CIRCUIT IC 801 circuit (WT8041), a sychronous signal processor of multi-sync, is capapble of many functions such as the horizontal and vertical frequency discrimination, display mode selection and synchronous pulse polarity detection. Pin 15 and pin 16 work as a clock generating circuit. Output pin 4 is active high while pin 5 is ac- tive low, fixed polarity and have the same pulse width as the original horizontal and vertical sync.
Page 18 1428-30k series 6. H-SIZE CONTROL and PIN COMPENSATION The control of picture width and side pincushion compensation is achieved through changing the source volt- age of the horizontal deflection circuit. There’s need for some components to build a diode modulator. This circuit consist of C620, L602, C611, D602, D610 and H-DY.
Page 19: Video Amplifier Circuit
1428-30k series 7. VIDEO AMPLIFIER CIRCUIT The video circuit includes: video processing IC201 and video amplifier circuit (Q211, Q205 and Q208). The analog video processor IC201 includes gain control and DC restoration. Video signals RGB are input through the coupling capacitorsC206, C205, C204 and than sent to IC201.
Page 20 1428-30k series ELECTRICAL DATA AND RATINGS / CHUNGHWA 14” pg.16...
Page 21 1428-30k series pg.17...
Page 22: General Adjustment
1428-30k series GENERAL ADJUSTMENT FACTORY SPECIFICATION Unless being specified, “Factory spec.” means the final adjustment made by the operator in the factory. This adjustment is intended to be close to the standard display characteristics. TEST SIGNAL R,G,B video signals are identical and specified signals for standard VGA mode of 480 lines.
Page 23 1428-30k series • CRT diagnostic software included in Kristel 3.5” diskette • hipot tester • video generator • TEST Bezel - fixture model / depending on customer availability PROCEDURE ⇒ Apply AC recommended power and video signal from customer supplied generator or use IBM compatible computer ⇒...
Page 24 1428-30k series ⇒ Background white balance adjustment: • set all bias VR’s (204, 205 and 206) to max. and let the raster to be invisible • display black pattern (all video signals are disable) and adjust SCREEN VR, • as soon as the raster appears, check out which color (red, green or blue) comes out first •...
Page 25 1428-30k series CONVERGENCE and PURITY pg.21...
Page 26: More Information
1428-30k series MORE INFORMATION regarding convergence and purity: R,G, B bias R,B gain P 201 pg.22...
Page 27: Troubleshooting Guide
1428-30k series TROUBLE SHOOTING GUIDE pg.23...
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Page 31: Bill Of Material
1428-30k series BILL OF MATERIAL pg.27...
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Page 41 CM1438...
Page 42 1428-30k series, AUTO BIAS...
Page 43 1428-30k series CREATION, PERFECTION, TEAMWORK 555.South KIRK Road, ST.CHARLES, IL 60174 phone: 630 / 443-1290 fax: 630 / 443- 1390...

This manual is also suitable for:

200-200-1564