Panasonic CT-27D10B Service Manual

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

Panasonic CT-27D10B Service Manual Manual pdf 26 page image

- 26 -Service Adjustments (Electronic Controls, cont.)Horizontal CenteringServiceman DAC Adjustment (D0)Preparation:Connect a monoscope pattern generator.Procedure:1. In the Serviceman Mode for making electronicadjustments. Select the Horizontal CenteringAdjustment DAC (D0) and adjust until the center ofthe monoscope pattern is centered on CRT.2. EXIT the Serviceman Adjustment Mode.MTS Circuit AdjustmentsThe MTS Circuit Adjustments require two steps:1. Input Level Adjustment.2. Stereo Separation Adjustment.Input Level Adjustment (M0)Preparation:1. Connect an RMS meter with filter jig as shown inFig. 24.2. Connect an RF signal generator to the RFantenna input.Procedure:1. Apply the following signal from the RF signalgenerator:Video: 100 IRE flat field, 30% modulation.Audio: 300Hz, 100% modulation, monaural(70 ±5dB, 75Ω OPEN, P/S 10dB).2. Adjust the MTS Input Level Adjustment (M0) untilthe voltage measured is 106 ± 6.0mV rms.Stereo Separation Adjustment (M1 & M2)Preparation:1. Connect an RF signal generator to the RF antennainput.2. Connect a scope to TPE10.Procedure:1. Select Stereo Mode in Audio menu2. Apply the following signal from the RF signalgenerator:Video: 100 IRE flat field, 30% modulation.Audio: 300Hz, 100% modulation, stereo (left only)(70 ±5dB, 75Ω OPEN, P/S 10dB).3. Adjust the MTS Low-Level Separation Adjustment(M1) until the amplitude displayed on the scopeis minimum.4. Apply the following signal from the RFsignal generator:Video: 100 IRE flat field, 30% modulation.Audio: 3KHz, 100% modulation, stereo (left only)(70 ±5dB, 75Ω OPEN, P/S 10dB).5. Adjust the MTS High-Level Separation Adjustment(M2) until the amplitude displayed on the scope isminimum.6. Repeat above steps 2 through 5 until the amplitudeis at minimum for both signals.10k4700pTPE11RMSMETERFigure 24. Filter Jig