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PHOTOFACT, Technical Service Data

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PHOTOFACT, Technical Service Data PHOTOFACT, Technical Service Data INDEX SONY Adjustment and Alignment Tools .... 1 Model W-27EXR25 (Chassis SCC-D50F-A) Convergence Adjustments .......... 6 GridTrace Location Guide ABoard .................... .8 ..9 GBoard .................... .9 .8 PBoard-TopBoard ...........8 UlBoard .9 ................... .9 Important Parts Information ........ 10 Miscellaneous Adjustments ......... 6 PartsList ................. 9,10,11 Photos ABoard .................. .7,8 CBoard .................... .9 Cabinet - Rear View ........... 1 CRT Neck Assembly .......... 6 GBoard .................... .9 HBoard .................... .8 PBoard-BottomBoard ..... .7,8 PBoard-TopBoard ........ .7,8 Ul Board ................. .4,9 Complete coverage U2Board ................. .8,9 for servicing a television receiver... ! Troubleshooting Quick-Checks ABoard .................... .7 CBoard .................... .9 l Schematics l Parts lists PIP Adjustments .................. 6 Placement Chart ................. .5 l Component l Troubleshooting Safety Precautions ............... 1 locations guide Safety Related Adjustments ......... 6 Schematics CRT ....................... .2 Control ...................... Coverage includes this additional model and chassis: D/A Converter ................ 2 MODEL CHASSIS MTS Decoder ............... .3 KV-27EXR20 SCC-DSOE-A PIP .......................... 4 Power Supply ................ .4 Television ................... .2 Terminal Guides and Notes ........ .7 Test Equipment ................... 1 Troubleshooting ................... 1 Tuner Terminal Guide ............. 6 Tuner Voltage Chart ............... 6 For Supplier Address, HOWARD W. SAMS & COMPANY See PHOTOFACT Annual Index DECEMBER 1991 SET 2910 TROUBLESHOOTING POWER SUPPLY HORIZONTAL Check AC Fuse F60 1. Determine if the TV is in shutdown: If F60 1 is open: Refer to the “High Voltage Shutdown” section of this Troubleshooting guide. Check Bridge Rectifier Diodes (D601, and D602), Resistor (R601), Capacitors. C601, C603 thru C606, Electrolytics C607, If the TV is not in shutdown, inject a horizontal signal at the base of and C650, Power Converter IC (IC65 l), and Power Transformer the Horizontal Output Transistor (4502). (T604). If horizontal deflection is now present: Apply 120V and check for 17.OV at the (+) lead of D602. Check the voltages, waveforms, and components associated If 17.OV is missing: with pins 37,39,41, and 45 of Y/C/J IC (IC301), and Horizontal Drive Transistor (Q501). Check Line Filters (T601, T602), Power Transformer (T604), Capacitors C608, C609, Electrolytic C610, and D602. If there is no horizontal sweep: If 17.OV is present, check for 15OV* at the (+) lead of D601. Check the voltages, waveforms, and components associated with 4502, and Horizontal Output Transformer (T500), and If 15OV* is missing: check components associated with Diodes D5 17, D5 19, D520, Check the voltages, waveforms, and components associated D521, and D531 for defects. with Power Relay (RY601), and Relay Driver Transistor The high voltage rectifier is part of T500 and if defective will effect (Q601), and D601. the performance of the horizontal circuits. Note: The set may be in shutdown. Refer to the “High Voltage If the horizontal oscillator is off frequency: Shutdown” section of this Troubleshooting guide. Check the voltages, waveforms, and components associated If 15OV* is present at the (+) lead of D601, check for the proper wa- with AFC-DET Transistor (Q307), and Buffer Transistor veform at pin 1 of IC65 1. (Q3W. If the waveform is missing: Horizontal linearity or foldover problems may be caused by Capaci- Check the voltages, waveforms, and components associated tors C506, C507, and C509 beiig defective. with IC65 1, Transfer IC (IC652), Converter Transformer (T651), and Soft Start Transistor (4612). If the proper waveform is present at pin 1 of IC65 1: VERTICAL Check the voltages, waveforms, and components associated Inject a vertical drive signal at pin 3 1 of Y/C/J IC (IC301). with T6.5 1. If vertical deflection is now present: * Taken from isolated ground. Check the voltages, waveforms, and components associated with pins 29 thrn 34,38, and 44 of IC301. HIGH VOLTAGE SHUTDOWN If there is still no vertical deflection: Check the voltages, waveforms, and components associated The high voltage is monitored by Diode D531, rectifying pulses with Vert Out IC (ICSOO). from the Horizontal Output Transformer (T500). Should the high ,voltage increase, the rectified voltage at the cathode of Diode D531 Vertical linearity or foldover problems may be caused by pincush- will also increase, This will cause the voltage at pin 8 of Protect ion, vertical feedback and bias circuits: Module (PM501) to increase and turn on Protect Transistors (Q607, Check the voltages, waveforms, and components associated 4608) which causes Relay Drive Transistor (4601) to turn off and with Pin Correction IC (IC531) and Pin Out Transistor (4530). remove power from the set. Also check Electrolytics C328, C538, C540, C562, C563, and To troubleshoot, remove Resistor R629 fom the circuit. Use a variac C566 for defects. for AC power. Start at 90VAC and increase as necessary to locate and repair the defect. Return R629 to the circuit. Note: Care should be taken in defeating the high voltage shutdown IF-AGC circuit, as this may cause excessive X-radiation and damage the CRT, TSOO, and associated components. Monitor the high voltage Inject a video signal at the IF input and check for video on the CRT. and troubleshoot. If video is present: Check the tuner, tuner control, and tuner AFC circuits. TROUBLESHOOTING continued If there is no video on the CRT, check for a video waveform at Check the voltages, waveforms, and components associated TP12. with pins 3,4,8,26, and 27 of Y/C/J IC (IC301), Buffer Transistors (43 lO,Q3 13), Gamma Comp 1 Transistor (43 15), If video is present at TP12: and Equalizer Transistor (43 14). Y Clamp Transistor (43 17), Refer to the “Video” section of this Troubleshooting guide. and Gamma Comp 2 Transistor (4316). If there is no video at TP12: If brightness is inadequate or camrot be controll& Check the voltages, waveforms, and components associated Check the voltages, waveforms, and components associated with IF Module (IF201), and AGC Mute Transistor (Q102). with pin 5 of v901. A defective AGC circuit can cause an overloaded picture, excessive snow or loss of audio and video. CHROMA See the AGC Voltage Chart for AGC voltages with signal. Check for a chroma waveform at pm 5 of Y/C/J IC (X301). AGC Voltage Chart If the waveform is missing: IF201 pm 1 5.3v Check the voltages, waveforms, and components associated with Buffer Transistor (Q417), C-Switch IC (IC403), and pin 4 of Comb Filter (CM1301). SYNC If chroma waveform is present at pin 5 of IC30 1, cheek for the pmp er waveforms at pins 20,22,24 of IC301. If there is no vertical or horizontal sync: If these waveforms are missing: Check the voltages, waveforms, and components associated Check the voltages, waveforms, and components associated with Y Buffer Transistor (4301). with pins 5,6,7,19 thru 25 of IC301. If there is no vertical sync: Check the 3.58MHz oscillator at pin 7 of IC301. Check the voltages, waveforms, and components associated If the proper wavforms are present at pins 20,22,24 of IC301: with pins 38, and 44 of Y/C/J IC (IC301), V/Sext 1 Transistor (Q302), V/Sext 2 Transitor (Q303), and V/Sext 3 Transistor Refer to the “Raster” section of this Troubleshooting guide. (Q3W. If there is no horizontal sync: RASTER Check the voltages, waveforms, and components associated with pins 41, and 45 of IC301. Check the CRT and CRT voltages. Cheek the voltages, waveforms, and components associated with Buffer Transistor (Q711), SW 1 Transistor (Q710), and SW 2 Transistor (4712). VIDEO If there is no Red: Inject a signal at TP12, and check for video on the CRT Cheek the voltages, waveforms, and components associated with pin 20 of Y/C/J IC (IC301), Red Output Transistor (4708). If video is present: Video Amp Transistor (Q709), and Red 1K Det Transistors Refer to the “IF-AGC” section of this Troubleshooting guide. (Q707,Q7 16). If there is no video on the CRT, check for a video waveform at pin 6 If there is no Green: of Comb Filter (CM1301). Check the voltages, waveforms, and components associated If video is missing at pm 6 of CM1301: with pin 22 of IC301, Green Output Transistor (Q704), Video Amp Transistor (Q705), and Green 1K Det Transistors (4706, Check the voltages, waveforms, and components associated 47 15). with Buffer Transistors (4409, Q410), and AV-Switch IC (IC444), and CM1301. If there is no Blue: If video is present at pin 6 of CM1301, check for a video waveform Check the voltages, waveforms, and components associated at the emitter of Y Amp Transistor (4305). with pm 24 of IC301, Blue Output Transistor (Q701), Video Amp Transistor (Q702), and Blue 1K Det Transistors (4703, If the video is missing: 47 14). Check the voltages, waveforms, and components associated If the raster has a keystone shape: with 4305, Buffer Transistor (Q416), and Y Switch IC (IC402). Check the Deflection Yoke (L550). If the waveform is present at the emitter of 4305: SET 2910 Page 1 TROUBLESHOOTING continued If the raster has height or width problems: Check the voltages, wavefotms, and components associated with pins 10 thru 13 of IC2104, Vertical Pulse Transistor Refer to “Vertical”, “Horizontal”, and “Power Supply” sections (Q2119), and pins 5 and 36 of Y/C/J IC (IC2103). of this Troubleshooting guide. If waveform is present at pin 23 of IC2204, check for the proper wa- veform at pin 61 of IC2204. AUDIO If waveform is missing: Select an active TV channel and check for an audio waveforms at Check the voltages, waveforms, and components associated pins 1 and 2 of MTS Decode IC (IC25 1). with pins 1 and 2 of IC2 104, and Buffer Transistor (43 12) If there is no audio: If waveform is present at pin 23 of IC2204: Check the voltages, waveforms, and components associated Check the voltages, waveforms, and components associated with IC25 1, and pin 10 of IF Module (IF201).
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