Recently acquired this machine, bordering on the 'spears and rapiers' category.
Someone's been in there before... :
Torch was incomplete and in bits (fixed), PCB out, wiring mostly missing (now 'lashed up'), rotary voltage 5 position switch was out (plus an extra one was inside!)
First, I tested the big electrical bits, which all seemed OK.
It has had a wire feeder upgrade in the past, to a person-sized 40W motor. So worth saving.
The PCB. All was / is not well here. Note that the wire feed speed control SCR is 'en vacance'.
The board mounted mains to 12 vac transformer (removed, stage left) was also dead, plus another PCB diode.
These were variously repopulated with robbed components to hand. (Suggestions as to a replacement SCR spec. are welcomed).
Powered on. Not good on all scores:
Tripped. The replaced components got fried again.
The teenagers had to endure an actual 5 minutes off-line.
NHS wife also castigated me; stop messing about, there's no spare ambulances.
The rotary 5 position voltage selector switch. View attachment 267781
After digesting / understanding Sealey schematics, i.e. those blocks of of XXs, it transpires that the replacement rotary switch fitted had a bridge between L1 and L2, a dead short on L and N.
The original rotary switch has now been refitted and it seems OK.
I don't need or want this machine.
Someone's been in there before... :
Torch was incomplete and in bits (fixed), PCB out, wiring mostly missing (now 'lashed up'), rotary voltage 5 position switch was out (plus an extra one was inside!)
First, I tested the big electrical bits, which all seemed OK.
It has had a wire feeder upgrade in the past, to a person-sized 40W motor. So worth saving.
The PCB. All was / is not well here. Note that the wire feed speed control SCR is 'en vacance'.
The board mounted mains to 12 vac transformer (removed, stage left) was also dead, plus another PCB diode.
These were variously repopulated with robbed components to hand. (Suggestions as to a replacement SCR spec. are welcomed).
Powered on. Not good on all scores:
Tripped. The replaced components got fried again.
The teenagers had to endure an actual 5 minutes off-line.
NHS wife also castigated me; stop messing about, there's no spare ambulances.
The rotary 5 position voltage selector switch. View attachment 267781
After digesting / understanding Sealey schematics, i.e. those blocks of of XXs, it transpires that the replacement rotary switch fitted had a bridge between L1 and L2, a dead short on L and N.
The original rotary switch has now been refitted and it seems OK.
I don't need or want this machine.