BG CD 5500 fusible resistors

5 replies
JÖ
Offline
Johan Östlund
Bronze
Posted October 8, 2014 at 17:37 GMT
#2201140

Hi everyone!

I've been trouble shooting my old CD 5500 that did nothing when plugged in. I traced it down to R11 and R12, one measures in the MOhms and the other is open. As I can't find a fuse I can only assume that their purpose is to act as such.

My question is what to replace them with to get the same behavior in over current situations, i.e. to work like intended?

Now, before you come suggesting there's a reason that they blew and I should find out why (rightly so!), I did actually short them out and monitor the current draw and everything looked completely normal. To give you the background, I was using the machine to reverse engineer its datalink behavior on start-up to mimic that for a gadget I'm building and I probably screwed up and shorted something.

Anyway, advice would be highly appreciated!

Thanks!

/  Johan

DI
Offline
Dillen
BronzeModeratorFounder
Posted October 8, 2014 at 17:48 GMT
#2201141

Something like this ?

JÖ
Offline
Johan Östlund
Bronze
Posted October 8, 2014 at 17:55 GMT
#2201142

Yes, I suppose.

I just figured there was a current figure to take into account, but perhaps that would have been in the manual then?

Forgive my newbieness, I've never had to deal with these before.

Thanks!

/  Johan

C(
Offline
chartz (archived2)
Bronze
Posted October 8, 2014 at 18:14 GMT
#2201143

I replaced those with ordinary fast fuses on holders. There's enough room to do that, and It's been 3 years.

The cause for their melting was two bad caps (shorted) in the PSU section. The zener was gone too.

JÖ
Offline
Johan Östlund
Bronze
Posted October 8, 2014 at 18:52 GMT
#2201144

chartz wrote:

I replaced those with ordinary fast fuses on holders. There's enough room to do that, and It's been 3 years.

The cause for their melting was two bad caps (shorted) in the PSU section. The zener was gone too.

Ok, sounds sane. What rating?

To be honest I haven't done more trouble shooting than finding the faulty resistors yet. But everything seems to be working normally apart from those, so I think it was me rather than a bad cap. I'm not aiming to get this unit into perfect condition at the moment. I'm just using it to learn the communication protocols.

Thanks!

/  Johan

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