CONFIDENTIAL 1 Precautio 1-1 Safety Precautions WARNINGS Inspect all protective devices such as nonmetallic For continued safety, do not attempt to modify the control knobs, insulating materials, cabinet backs, circuit board. adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical Disconnect the AC power before servicing.
CONFIDENTIAL 1 Precautions 1-2 Servicing Precautions WARNING 1:First read the “Safety Precautions” section of this manual. If unforeseen circumstances create conflict between the servicing precautions and safety precautions, always follow the safety precautions. WARNING 2:A high voltage Micom control replaced in the wrong direction may cause excessive X- ray emissions.
CONFIDENTIAL 2 Product Specifications 2-2 Pin Assignments Sync Type Macintosh Separate Pin No. GND-R Green Blue H/V Sync Sense 0 DDC Return Green GND-R GND-G GND-G Sense 1 GND-B Reserved Blue GND-Sync/Self-raster Sense 2 DDC Data V-Sync H-Sync GND-B V-Sync DDC Clock H-Sync Figure 2-1.
CONFIDENTIAL 2 Product Specifications 2-3 Timing Chart This section of the service manual describes the timing that the computer industry recognizes as standard for computer-generated video signals. Table 2-1 Timing Chart Mode VESA VGA2/70 Hz VGA3/60 Hz 800/85 Hz 1024/85 Hz 640/85 Hz 640/75 Hz 640 x 480...
CONFIDENTIAL 3 Disassembly and Reassembly This section of the service manual describes the disassembly and reassembly procedures for the AN17K*/AN17L* monitor. WARNING: This monitor contains electrostatically sensitive devices. Use with caution when handling these components. 3-1 Disassembly Cautions:1. Disconnect the monitor from the power source before disassembly. 2.
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CONFIDENTIAL 3 Disassembly and Reassembly 6. Remove the Shield.(TCO 99) 3-1-4 Removing the Main PCB 1. Complete all previous steps. 2. Disconnect the Degaussing Coil at CN603 on the Main PCB. 3. Disconnect all easily accessible ground wires on the PCB and Bottom Chassis. 4.
CONFIDENTIAL 4 Alignment and Adjustments This section of the service manual explains how to make permanent adjustments to the monitor. Directions are given for adjustments using the monitor Interface Board Ver. 2.0 and software (Softjig). 4-1 Adjustment Conditions Caution: Changes made without the Softjig are saved only to the user mode settings. As such, the settings are not permanently stored and may be inadvertently deleted by the user.
CONFIDENTIAL 4 Alignment and Adjustments 4-2 Display Control Adjustments 4-2-1 HIGH VOLTAGE Signal: 1024 x 768 (68 kHz/85 Hz) Run the All Mode save in the Right Menu. Display image: Don’t care Caution : Do not Run the All mode Save at the Contrast: Minimum other scannig times except for 1024x768...
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CONFIDENTIAL 4 Alignment and Adjustments Table 4-2. Other Modes Linearity: Use control bar after selecting “PINBALANCE” in left menu to optimize the image. above 40 KHz(Hf) Supported Timing Mode 4-2-7 Parallelogram Adjustment Difference between Each block (14 %) adjacent blocks (5 %) CONDITIONS Horizontal: 20.5~23.5 Horizontal: Less than 1.10 mm...
CONFIDENTIAL 4 Alignment and Adjustments 4-3 Color Adjustments CAUTION:Check below condition before color 4-3-2 (b) WHITE BALANCE ADJUSTMENT adjustment CONDITIONS Video signal : Analog 0.7 Vp-p (at 75 ) Scanning frequency: 68 kHz/85 Hz Sync : TTL level (H, V seperate signal) Display image: White box pattern Brightness:...
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CONFIDENTIAL 4 Alignment and Adjustments 4-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION PROCEDURE Measure luminance at nine points on the display CONDITIONS screen (see figure below). Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern Full White Pattern X-Y Coordinates: x = 0.283 ±...
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CONFIDENTIAL 4 Alignment and Adjustments PROCEDURE For trained and experienced service technicians only. Use the following procedure to correct minor color purity problems: 1. Make sure the display is not affected by external magnetic fields. 2. Make sure the spacing between the PCM assembly and the CRT stem is 29 mm ±...
CONFIDENTIAL 5 Troubleshooting 5-1 Parts Level Troubleshooting Notes: Check the following circuits. • No raster appears: Power circuit, Horizontal output circuit. • High voltage develops but no raster appears: Video output circuits. • High voltage does not develop: Horizontal output circuits. 5-1-1 No Power Supply WAVEFORMS Check and replace D601 and FH1...
CONFIDENTIAL 5 Troubleshooting 5-1-2 DPMS Failure WAVEFORMS Check signal source H/V Sync. video level. 100V (IC601, #1) Make No H/V Sync. (power off mode) LED blinks? CH1 P-P = 100V CH1 RMS = 325.8 V Check IC201 Pin 40. Check IC201 Pin 5/Pin 6 and +12 V line off? Q610/Q602 operation.
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CONFIDENTIAL 5 Troubleshooting 5-1-3 H_Deflection Failure Does PWM output signal appear Does DC 12V appear at Check 12 V line. at Pin 28 (B_DRV) of IC401? Pin 29 of IC401? WAVEFORMS Check IC401. 2.00 V (IC401, #28) Does Horizontal pluse signal Check IC401.
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CONFIDENTIAL 5 Troubleshooting 5-1-5 H_Lin. Failure Check and Replace T402 5-1-6 Invariable H_Size IC401 Pin 28 voltage varies with Check and replace IC401. different B_DRV DAC values? Q402 Gate output duty varies with Check some parts around Q402, different B_DRV DAC values? IC401 Pin 14 ~ 16.
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CONFIDENTIAL 5 Troubleshooting 5-1-8 Side Pin or Trap Failure WAVEFORMS IC401 Pin 24 output exists? Check and replace IC401. 1.00 V (IC401, #24) Refer to 5-1-7 Abnormal H_Size . CH1 P-P = 1.00V CH1 RMS = 3.008 V 5-1-9 Para. or Pin Balance Failure IC401 Pin 24 output varies with Refer to 5-1-7 Abnormal H_Size .
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CONFIDENTIAL 5 Troubleshooting 5-1-11 V Deflection Failure WAVEFORMS 13V and –13V lines are on? Refer to 5-1-1 No Power Supply 500 V (IC401, #23) IC401 Pin 23 output exists? Check and replace IC401. CH1 P-P = 500 V CH1 RMS = 1.425 V Check and replace 10.0 V (IC301, #6) IC301 Pin 6 output exists?
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CONFIDENTIAL 5 Troubleshooting 5-1-13 High Voltage Failure WAVEFORMS Check and replace IC401 IC401 Pin 28 OSC pulse exists? 2.00 V (IC401, #28) and +12 V line. Q402 Gate driving pulse exists? Check and replace Q401 and Q420. CH1 P-P = 2.00 V CH1 RMS = 5.868 V Check and replace 2.00 V (Q402, Gate) Q402 Drain pulse exists?
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CONFIDENTIAL 5 Troubleshooting 5-1-15 Dynamic Focus Failure WAVEFORMS IC401 Pin 32 output is right? Replace the IC401. 2.00 V (IC401, #32) Some parts around Q551 are right? Replace failed part. CH1 P-P = 2.00V CH1 RMS = 6.124V T502 Pin 6 input is right? 50.0 V (T502, #6) Check and replace C432.
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CONFIDENTIAL 5 Troubleshooting 5-1-16 No Video WAVEFORMS Check signal cable and connection. 1.00V (IC101 #12,14,16) IC101 Pin 12, 14 and 16 inputs Check the signal cable connection. are right? IC101 Pin 18, 21 and 24 Check I C bus and +12V line. outputs are right? CH1 P-P = 1.00V CH1 RMS = 2.452V 1.00V (IC101 #18,21,24)
CONFIDENTIAL 5 Troubleshooting 5-1-17 Micom Failure WAVEFORMS IC201 Pin 11 input voltage is 5V? Check IC604. 1.00 V (IC201, #13, 14) IC201 Pin 13 and 14 inputs Check C202, C203 and X201. are right? CH1 P-P = 1.00 V CH1 RMS = 2.108V IC201 Pin 18 input is right? Check and replace IC201 and R206.
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CONFIDENTIAL 5 Troubleshooting 5-1-18 OSD Failure Check CN102 and connector Ass’y. WAVEFORMS 1.00 V (IC101, #32) Check and replace IC101 Pin 32 input is right? R117, C117 and IC101. IC101 Pin 1 input is right? Check CN102 Pin 8. CH1 P-P = 1.00V CH1 RMS = 4.516V 1.00 V (IC101, #1) IC101 Pin 29 and 30 inputs are Check IC201 Pin 41 and 42.
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CONFIDENTIAL 5 Troubleshooting 5-1-19 User Control Failure Does the DC level change at Check the button. Pin 38 of IC201 when you (SW201 ~ SW204) push the S/W button? Check IC201. 5-1-20 Degaussing Failure Check degaussing connector. RL601 operation is right? Check D-coil and TH601.
CONFIDENTIAL 5 Troubleshooting 5-2 General Troubleshooting 5-2-1 No Picture LED blinks? Refer to 5-2-2 Shut down. LED is green color? Check Micom. Check G2 voltage, high voltage and R, G, B cathode voltage. 5-2-2 Shut Down Blinking LED’s? Check power supply. Check horizontal, vertical deflection Scan failure? system and check power supply...
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CONFIDENTIAL 5 Troubleshooting 5-2-3 Missing Color WAVEFORMS Proper Video levels are Check signal generator. 10.0 V (R,G,B, Video) on CN101 (D-Sub) Pin 1, 3 and 5? Proper Video signal Refer to 5-1-16 No Video. to all cathodes? CH1 P-P = 10.0V CH1 RMS = 17.02V Check IC101 Pin 17, 20 and 23.
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CONFIDENTIAL 5 Troubleshooting 5-2-4 Visible Retrace WAVEFORMS Check white balance adjustment. 5.00V (Q303, Collector) G2 voltage is right? Check D502, D512. Blank pulse at Pin 3 of IC401? Check IC401. CH1 P-P = 5.00V CH1 RMS = 28.33V 20.00V (CRT Socket, G1) V_FLB pulse at Check Q303.
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CONFIDENTIAL 5 Troubleshooting 5-2-5 Unsynchronized Image Check input signals Pin 2 and 3 of CN202. Signals are right? Check Video Cable Signals at Pin 28 and 29 of Check IC201. IC201 are right? Signals at Pin 1 and 2 of Check IC401 IC401 are right? Check circuits on Main board.
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CONFIDENTIAL 5 Troubleshooting 5-2-6 Misconvergence Adjust convergence. Convergence is now Done within spec.? Readjust convergence. Convergence is now Done within spec.? Change CRT and readjust convergence. Done AN17K*/AN17L* 5-17...
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CONFIDENTIAL 5 Troubleshooting 5-2-7 Poor Focus Adjust focus VR of FBT. Align monitor and Improved focus? check for focus change. Check focus leads from FBT to CRT Socket. Check CRT Socket. Refer to 5-1-15 Dynamic Dynamic focus circuit is right? Focus Failure.