hi all i have this skytronic lab psu(linear),it was brought faulty,on powering it up voltage displayed about 50v,I found the coarse voltage controll pot busted off the pcb so assumed the psu had been dropped,i replaced it with a 10k,then the relays buzzed loudly,as i alterd the volage pots,long story short,i found 1 of 8 rectifier diodes shorted and a tap switching relay with welded contacts,i replaced the relay and diode,then it worked but would only output about 2a max,i since found 2 more diodes s/c,i could do with a schematic if anyone can help,i have replaced the diodes but have not put it together yet,but suspect it will fry the replacements,all pass transistors are ok+ the driver,its a 0-30v 5 amp psu,see pics.

 

Update,i fitted a new relay and replaced the diodes,refitted the pcb,it goes from 0-31v ok,but it will only output,about 5 ish amps max,the cc led doesent light trying to get max load and works fine upto 5a,i notice only one groupe of rectifier diodes get warm,samw with the pass transistors,only 2 get warm,would that cause the 5a op not 10 max,if so where should i start looking?,ive ran it into a 100w 1ohm resistor,the unit ampmeter corresponds to the voltage drop over the resistor,also reads 5a max into my avo8 and fluke 83 on amps range,so looks like it realy is doing 5a max TIA.