Memorex MT2025D Service Manual - Page 6

AGC Adjustment Receive 60dBμ (1mV) VH colour bar pattern signal. Select RF AGC item. Adjust value, to noise reduce gradually and just disappeared point. CRT cut off and white balance adjustment a) CRT cut off adjustment 1. Select item VG2B, then adjust value to 32. 2. PRESS "MENU" key to page 2, when the screen shows"VK" adjust the SCREEN control on Fly back transformer to make the screen show alternating flashing characters to darkle. b) White balance adjustment 1. Receive a Black and White pattern. Maintenance Service and Trouble shooting 2. Adjust RC, GC, BC,RD,BD items to get colour temperature 9300K ±3 JND. A3. Error Detection Process 1. No light and sound Normal Check to see if Fuse is normal Abnormal Check D901~D904, C914, IC9601, Q901 Normal Check to see if the collector voltage of D909 is 13.5V Check to see 110V、180V etc. voltage is normal Abnormal Test to see all terminal Resistance of load Normal Check to see if , ZD201 8v, is normal Abnormal Normal Check the control voltage of Q207 or CPU power pin Check switch power unit Abnormal Check to see if rectifying tube is normal Normal ThTehe ffaailiulrue reofhoorizfontahl ourniitzontal unoitrNo2r 04IC201 Abnormal Check IC602 ,ect Normal Check the Loader 1 Abnormal Change rectifying diode PDF pdf Fact or y Pr o wÿww. f i nepr i nt . com. cn