Grating is normal, that the power and field scanning, tube circuit are working properly; No PIC, silent by public channel, AGC and power supply circuit fault cause. Y7kservice manual download site
The machine on the basis of NP82 increased by remote control. So when the remote control circuit is out of order, also can appear without images. Without accompanying of failure. Y7kservice manual download site
 Y7kservice manual download site
 Y7kservice manual download site
(1) is used to control tuning or remote control tuning are close not vice images, figures show that only the "eight" word, failure is not remote control transmitter. Y7kservice manual download site
(2) boot check the CPU board power supply, 5 v, 12 v are not, again without between TH1, TH2 ac voltage. Shutdown T991 transformer resistance found has been burned. Only replace the T991. Y7kservice manual download site
(3) due to buy less than the transformer only rewind. Primary use QZ (or QZ - 1) phi is 0.12 ~ 0.15 mm enameled wire around 3920 turns. Primary use phi is 0.31 ~ 0.35 mm enameled wire around 310 turns. Around, secondary voltage test of 15 v ac. No-load current, no-load temperature rise are qualified. Fixed coil with transparent tape, according to the original pin location good welding wire, back into the machine experiment, the radio, choose platform, image sound all normal.Y7kservice manual download site