Panasonic CT-25G6E Service Manual

Also see for CT27G6DE - 27" COLOR TV: Operating instructions Service manual

Panasonic CT-25G6E Service Manual Manual pdf 10 page image

- 10 -Chassis Service Adjustment ProceduresAll service adjustments are factory preset and shouldnot require adjustment unless controls and/orassociated components are replaced.Note: Connect the (-) lead of the voltmeter to theappropriate ground. Use IC801’s heat sinkwhen the HOT ground symbol ( ) is used.Otherwise, use COLD ground ( ) — Tunershield, IC451’s heat sink or FA2.MOMENTARILY CONNECT A JUMPER TO ENTER SERVICE MODE (FA1 to FA2)130.0V B+ Voltage Confirmation1. Set the Bright and the Contrast to Minimum byusing the Picture Menu.2. Connect the DVM between C825 (+ side) orTPD14 and cold ground ( ).3. Confirm that B+ voltage is 130.0V ± 2.5V. Thisvoltage supplies B+ to the Horizontal Output &Flyback circuits.Source Voltage Chart120V AC line input. Set the Bright and the Picture toMinimum by using the Picture Menu. Use cold ground( ) for the (-) lead of the DVM.Adjust Picture Menu for normalized video adjustments.High Voltage Check1. Select an active TV channel and confirm thathorizontal is in sync.2. Adjust Brightness and Contrast using Picture Iconmenu so video just disappears.3. Confirm B+ 131V is within limit.4. Using a high voltage meter confirm that the HighVoltage is 29.25kV ± 1.25kV.Figure 4. A-Board MainComponents and Test Points(Components within dottedareas are located ontrace side)LOCATION VOLTAGETPD8 26.0V ± 2.0VTPD9 13.0V ± 2.0VIC551 Pin3 9.0V ± 0.25VIC552 Pin3 5.0V ± 0.25VD554 Cathode 220V ± 15V