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Sony KV-27EXR25 PHOTOFACT Technical Service Data
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Sony KV-27EXR25 PHOTOFACT Technical Service Data

Sony KV-27EXR25 PHOTOFACT Technical Service Data

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INDEX
Adjustment and Alignment Tools
Convergence Adjustments . . . . . . . . . . 6
Important Parts Information
Miscellaneous Adjustments
Photos
Cabinet - Rear View
CRT Neck Assembly
PBoard-BottomBoard . . . . . .7,8
Troubleshooting Quick-Checks
PIP Adjustments . . . . . . . . . . . . . . . . . . 6
Placement Chart
Safety Precautions . . . . . . . . . . . . . . . 1
Safety Related Adjustments
Schematics
CRT
Control . . . . . . . . . . . . . . . . . . . . . . .
D/A Converter . . . . . . . . . . . . . . . . 2
MTS Decoder
PIP . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Power Supply
Television
Terminal Guides and Notes
Test Equipment . . . . . . . . . . . . . . . . . . . 1
Troubleshooting
Tuner Terminal Guide
Tuner Voltage Chart . . . . . . . . . . . . . . . 6
For Supplier Address,
See PHOTOFACT Annual Index
Technical Service Data
1
8
10
6
1
. . . . . . . . . . 6
6
1
6
HOWARD W. SAMS & COMPANY
SONY
Model W-27EXR25 (Chassis SCC-D50F-A)
Complete coverage
for servicing a television receiver...
Schematics
l
Component
l
locations
Coverage includes this additional model and chassis:
MODEL
DECEMBER 1991 SET 2910
Parts lists
l
Troubleshooting
l
guide
CHASSIS

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Summary of Contents for Sony KV-27EXR25 PHOTOFACT

  • Page 1 Technical Service Data SONY INDEX Model W-27EXR25 (Chassis SCC-D50F-A) Adjustment and Alignment Tools Convergence Adjustments ..6 Important Parts Information Miscellaneous Adjustments Photos Cabinet - Rear View CRT Neck Assembly ..6 PBoard-BottomBoard .

  • Page 2: Troubleshooting

    TROUBLESHOOTING HORIZONTAL POWER SUPPLY Determine if the TV is in shutdown: Check AC Fuse F60 1. Refer to the “High Voltage Shutdown” section of this Troubleshooting guide. Check Bridge Rectifier Diodes (D601, and D602), Resistor If the TV is not in shutdown, inject a horizontal signal at the base of the Horizontal Output Transistor (4502).
  • Page 3 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).
  • Page 4 SET 2910 Page 1 TROUBLESHOOTING continued Check the voltages, wavefotms, and components associated If the raster has height or width problems: with pins 10 thru 13 of IC2104, Vertical Pulse Transistor Refer to “Vertical”, “Horizontal”, and “Power Supply” sections of this Troubleshooting guide. If waveform is present at pin 23 of IC2204, check for the proper wa- veform at pin 61 of IC2204.
  • Page 5 TROUBLESHOOTING continued If the wave form is missing at the emitter of 42244: Check the voltages, waveforms, and components associated with 42244, pins 3 thru 6 of IC2 104, and pin 3 1 of IC2204. If the waveform is present at pin 4 of IC2201: Check the voltages, waveforms, and components associated with Y Buffer Transistor (42202).
  • Page 29 MISCELLANEOUS ADJUSTMENTS 3. Make changes on selected adjustment by pressing the 3 and 6 button. Note: Use Remote Commander to accomplish prehming. All proce- Saving Adjustments to Memory dures require an antenna or cable connected, and power supplied to the set. 1.
  • Page 30 Page 6 SET 2910 PIP ADJUSTMENTS PIP RGB PICTURE (RGBP) Note: Adjustments made with PIP on. Refer to “Digital Adjustment Procedure” in Miscellaneous Adjustment Section. Tune in a colorbar Pattern. Enter Service Adjustment Mode. Select RGBP adjustment, and adjust level to 00. Set Picture and Brightness PIP BRIGHTNESS AND CONTRAST to MINIMUM.
  • Page 31 MISCELLANEOUS ADJUSTMENTS continued VERTICAL COMP (VCOM) HORIZONTAL SIZE (HSIZ) Enter the Service Adjustment Mode. Select VCOM, and adjust level Tune in a crosshatch pattern. Enter the Service Adjustment Mode. to 02. Save adjustment to memory. Select HSIZ, and adjust level for slight horizontal overscan. Save ad- justment to memory.
  • Page 32 S E T 2910, P a g e 6 MISCELLANEOUS ADJUSTMENTS continued COLOR TEMPERATURE @CUT, GCUT, GAMP, BAMP) (RV702) to converge the Red and Blue dots over the Green dots horizontally at the center of the screen. Rotate the Vertical Static Adjust G2 Control (RV701) so that the retrace lines just disappear.

  • Page 33: Safety Related Adjustments

    SAFETY RELATED ADJUSTMENTS 2. Confum that the voltage at TP-85 is more than 108V when the set is operating normally with 120VAC supply. CONFIRMATION) AND READJUSTMENTS following adjustments should always be performed when replac- ing the following components PMSOl, 4608, 4607, R629, R628, Hold-down Operation Confirmation R627, R559.