Hi
I was given a Kenwood KA-701 in great cosmetic shape but not working .
I have recapped a couple of working amps previously with good results so i thought i'd have a go at this.
The first thing i did was to change all the electrolytic caps except the 4 big reservoir caps ,at switch on first thing i checked was dc offset and tried to set the bias , left channel ok, but right channel off the scale, i noticed resistor R64 glowing red hot , after a testing nearby components i found a faulty transistor Q26 and replaced it . Now the bias is correct on both channels @20mv but it blows fuse 3 .If one of you tech guys could point me in the right direction as to what to check next i would appreciate it .
Peter
I was given a Kenwood KA-701 in great cosmetic shape but not working .
I have recapped a couple of working amps previously with good results so i thought i'd have a go at this.
The first thing i did was to change all the electrolytic caps except the 4 big reservoir caps ,at switch on first thing i checked was dc offset and tried to set the bias , left channel ok, but right channel off the scale, i noticed resistor R64 glowing red hot , after a testing nearby components i found a faulty transistor Q26 and replaced it . Now the bias is correct on both channels @20mv but it blows fuse 3 .If one of you tech guys could point me in the right direction as to what to check next i would appreciate it .
Peter
when i put the fascia panel back on it seems i pinched the cable to the led on indicator, it must have shorted to earth 
. once i'd released the pinched cable and replaced the fuse i switched it on and it came out of protection and i thought it was sorted. This morning the protection relay is clicking in and out and the transistor i replaced Q26 is getting too hot
