Panasonic CT-32SX31CE Service Manual

Also see for CT-32SX31E: Operating instructions Service manual

Panasonic CT-32SX31CE Service Manual Manual pdf 28 page image

- 28 -Procedure:1. Connect the oscilloscope to TPY1.2. Apply a color bar signal in main and PIP (PIP on).3. In the Serviceman Mode for making electronicadjustments, select the DAC adjustment (P03) forPIP Sub-Subcontrast so that child (PIP) level is90% of parent (MAIN) signal (See Fig. 29)Color Temperature Adjustment(B/W Tracking)Serviceman DAC Adjust.(C00) (C01) (C02) (C04) (C05)Minor Touch-Up MethodOBSERVE low and high brightness areas of a B/Wpicture for proper tracking. Adjust only as required for“good gray scale and warm highlights”.1. LOW LIGHT areas – In Serviceman Mode formaking electronic adjustments, select Cutoff (C00)RED, (C01) GRN, (C02) BLU and adjust thepicture for gray.2. HIGH LIGHT areas – In Serviceman Mode formaking electronic adjustments, select Drive (C04)GRN, (C05) BLU and adjust the picture for warmwhites.Complete AdjustmentPreparation:1. Turn the Receiver “ON” and allow 10 minuteswarm up at high brightness.2. Apply a color bar signal with color “OFF”.3. Turn the SCREEN control (part of FBT T551) fullycounterclockwise.Procedure:Preset the following Serviceman DACs for best results:• C0 . . . . . . . . . . . . . . 128• C1 . . . . . . . . . . . . . . 128• C2 . . . . . . . . . . . . . . 128• C4 . . . . . . . . . . . . . . . 64• C5 . . . . . . . . . . . . . . . 641. Connect the oscilloscope to TP37 (L-Board).2. In Serviceman Mode for making electronicadjustment, select the Sub-Bright DAC (B02).3. Press the R-Tune key on the remote.4. Observe the oscilloscope waveform at Horizontalrate and adjust the Serviceman Mode Sub-BrightDAC (B02) level until a scanning period of2.3±0.05V above DC ground is measured, asindicated in Fig. 30.5. Press the R-Tune key on the remote.6. Connect the scope to RED Cathode (KR) on theCRT-Board.7. In the Serviceman Mode for making electronicadjustments, select the RED CUTOFF DAC (C00).8. Press the R-Tune key on the remote.9. View scope trace at Horizontal rate and adjust theServiceman Mode DAC (C00) level until ascanning period of 170±2V above DC ground ismeasured, as indicated in Fig. 31.10. Press the R-Tune key on the remote.11. Write the same C00 data to C01 and C02.12. Press the R-Tune key on the remote.13. Turn the Screen Control (part of FBT) slowlyclockwise until a slightly color horizontal lineappears.14. Adjust DAC C01 and C02 until the horizontal linebecomes white.15. Press the R-Tune key on the Remote16. In the Serviceman Mode for making electronicadjustments select the DAC DRIVE adjustments(C04) GRN, (C05) BLUE and adjust for warm whitein a white color bar pattern.17. Apply a monoscope pattern and check for a goodpicture.18. EXIT the Serviceman Mode.A Ax0.9Figure 29. Waveform0V DCFigure 30. TP35 Waveform2.3±0.05V DCFigure 31. KR Waveform170±2V DC0V DC (Ground)

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