Acer AC501 AC501 Monitor Service Guide - Page 24

B. Monitor Check Flow Chart B-1 No Raster No raster Check power No indecator lighted Ye s Check contrast & brightness control adjust to MAX. Ye s Check HEATER voltage= +6.3VDC G1 = 50-80 VDC G2 = 500-600 VDC Ye s Check CRT Check AC Ye s power input No Check Q801 collector voltage about 1200 Vpp Ye s C he ck F. B . T Check power supply circuit Check power supply c ir c u it Check U401 No No Check U401 pin7 output sequare wave from Ye s Check Q506 Ye s No C he ck F. B . T pin 3, voltage about 80-155V Ye s C he ck F. B . T 24