Panasonic CT-27D10B Service Manual

Also see for CT27D10DB - 27" COLOR TV: User guide

Panasonic CT-27D10B Service Manual Manual pdf 27 page image

- 27 -Service Adjustments (Electronic Controls, cont.)Clock Adjustment (S7)Preparation:Connect the frequency counter from TPS1 (IC001Pin 13) to cold ground ( ).Note: Frequency Counter probe capacitance shouldbe 8pF or less.Procedure:1. Turn the Receiver “OFF” with the ACpower applied.2. Measure TPS1 (IC001 pin 13) for the frequency ofthe waveform and record the reading.Note: Pin 13 measurement must have at least fourdigits of resolution following the decimal point.Example: 000.00003. Turn the Receiver back “ON”.4. Place the Receiver into Serviceman Mode formaking electronic adjustment, select the ClockAdjustment DAC (S7).5. Calculate and set Sb based on thefollowing formula:Note: Pin 13 measurement will not changeregardless of the value stored in Sb.Vertical Size (D1)1. Adjust the VERTICAL SIZE DAC control, D1, untilthe top and the bottom edges of the raster arevisible.2. Adjust the VERTICAL SIZE control, D1, until thetop and the bottom of the raster touch the bezeledge. The advance SIZE control to obtain anapproximately 10% overscan. Linearity adjustmentis don automatically when the size is beingadjusted. (Best results can de obtained with around test patter.)Service Adjustments (Mechanical Controls)Focus (part of T551)Preparation:Connect a Signal generator and select a dot pattern.Procedure:Adjust the FOCUS control to obtain the sharpest andclearest dot pattern.a. Adjust for best center.b. Adjust for best area between the center and topright corner.Sb 128 0.901 6×10 244.1406 pin13 Hz[ ]–{ }244.1406------------------------------------------------------------------+=