There are 3 fuses on the PCB. The line fuse, F3 must be good as your red motor supply LED is lit. Lack of display or other functions indicates no +5vdc rail, check F2 ( 2.5A fast ), if good check REG1 for +8/10vdc on input, and +5vdc on output. If there is a +5vdc output, the problem is further upstream in the logic section and can't be fixed via email. IF there is no dc output, REG 1 is bad. If there is no dc input to REG1, check BR1 for 8-10VAC on the input, and 8-10vdc on the output. If there is an AC voltage on the input, and nothing on the output, or the dc output is below the AC input voltage, then the bridge is bad and needs to be replaced ( this is common). If there is no AC input to BR1, and F2 is verified as good, look to the left of the lower V-select switch at header pins labeled LOGIC AC1, and LOGIC AC2. Should read 8/10VAC across these pins. If no AC is present, Transformer is bad. If you need the PCB repaired, email me don at lightparts dot com
There are 3 fuses on the PCB. The line fuse, F3 must be good as your red motor supply LED is lit. Lack of display or other functions indicates no +5vdc rail, check F2 ( 2.5A fast ), if good check REG1 for +8/10vdc on input, and +5vdc on output. If there is a +5vdc output, the problem is further upstream in the logic section and can't be fixed via email. IF there is no dc output, REG 1 is bad. If there is no dc input to REG1, check BR1 for 8-10VAC on the input, and 8-10vdc on the output. If there is an AC voltage on the input, and nothing on the output, or the dc output is below the AC input voltage, then the bridge is bad and needs to be replaced ( this is common). If there is no AC input to BR1, and F2 is verified as good, look to the left of the lower V-select switch at header pins labeled LOGIC AC1, and LOGIC AC2. Should read 8/10VAC across these pins. If no AC is present, Transformer is bad. If you need the PCB repaired, email me don at lightparts dot com
