mr.blisset
New member
So I was mixing the other night and I blew the F5 fuse while the machine was rewinding. I was working on a song at the very start of the reel. I've noticed it struggles to get up to speed recently when at the start of a reel and so I was helping it out by pulling down on the left control arm. I've been mixing a bunch recently and had no problems when not at the very start of a reel.
When I blew the fuse it was rewinding at the time and I assumed it happened as I was running an oil heater off the same power board. I figured the heater must have switched on and spiked the power to cause the 388 to blow the fuse. The little green lights came on when I press the various transport functions but the solenoids didn't engage and the tape wouldn't move. No sound...no function at all when pressing different transport functions.
So today I put a new F5 (3A slowblow) in the 388. Everything is running great again. I put a new reel on and when to track a metronome and keyboard outline of a new song.
I started off at the very start of the reel (thinking this was a mistake now?) Pressed record and did my take. When I finished I walked over to the machine and noticed it had stopped at 2.35mins in. The play button light was still on but nothing was moving and there were no mechanical sounds.
I noticed the all to familiar smell of something being cooked inside the machine. oh no.
Opened it up and noticed the fuse was still intact, slightly darkened where the white part usually is on a slowblow fuse... but still intact.
The bias PCB cards were quite warm and when I stuck my nose in there the power supply and fuse section to the left didn't give off a smell but just to the right where the bias PCB cards are there was an obvious smell of cooked something.
I pulled both cards. The bias PCB closest to the power supper has noticeable blackening around the solder joints of W124 and W123. There are no components here, just a bridging wire.
All the pods are scorched with the exception of the W123 pod that goes to W104 on the PCB.
The other three look slightly toasted but the pod on W124 that goes to W103 looks particularly scorched compared to the other three.
The other bias PCB looks okay in comparison but the same pods do look like the got a bit warm. No darkened burnt looking stuff though.
I hoping someone here might know what has happened? I guessing I've made the machine work too hard due to the tension arms coming slightly out of alignment over time. I wish I could replace a component at W123 and W124 but there's nothing there, its just a bridging wire. So if I've toasted something it's further up right? If anyone has any idea of what other PCBs to scan for damage that would be a big help too.
I'm going to go buy another fuse tomorrow and am really hoping it comes back to life again. The fuse does seem to be intact so I'm not sure this will help.
Thanks
When I blew the fuse it was rewinding at the time and I assumed it happened as I was running an oil heater off the same power board. I figured the heater must have switched on and spiked the power to cause the 388 to blow the fuse. The little green lights came on when I press the various transport functions but the solenoids didn't engage and the tape wouldn't move. No sound...no function at all when pressing different transport functions.
So today I put a new F5 (3A slowblow) in the 388. Everything is running great again. I put a new reel on and when to track a metronome and keyboard outline of a new song.
I started off at the very start of the reel (thinking this was a mistake now?) Pressed record and did my take. When I finished I walked over to the machine and noticed it had stopped at 2.35mins in. The play button light was still on but nothing was moving and there were no mechanical sounds.
I noticed the all to familiar smell of something being cooked inside the machine. oh no.
Opened it up and noticed the fuse was still intact, slightly darkened where the white part usually is on a slowblow fuse... but still intact.
The bias PCB cards were quite warm and when I stuck my nose in there the power supply and fuse section to the left didn't give off a smell but just to the right where the bias PCB cards are there was an obvious smell of cooked something.
I pulled both cards. The bias PCB closest to the power supper has noticeable blackening around the solder joints of W124 and W123. There are no components here, just a bridging wire.
All the pods are scorched with the exception of the W123 pod that goes to W104 on the PCB.
The other three look slightly toasted but the pod on W124 that goes to W103 looks particularly scorched compared to the other three.
The other bias PCB looks okay in comparison but the same pods do look like the got a bit warm. No darkened burnt looking stuff though.
I hoping someone here might know what has happened? I guessing I've made the machine work too hard due to the tension arms coming slightly out of alignment over time. I wish I could replace a component at W123 and W124 but there's nothing there, its just a bridging wire. So if I've toasted something it's further up right? If anyone has any idea of what other PCBs to scan for damage that would be a big help too.
I'm going to go buy another fuse tomorrow and am really hoping it comes back to life again. The fuse does seem to be intact so I'm not sure this will help.
Thanks