Mitel 5310IP Conference Controller
Hi Folks,
Our Mitel 5310 telephone conference saucer (speaker unit) just died - the power light would come on for a fraction of a sec, then go off, there would be a quick 'click', and then the cycle would repeat. These units aren't cheap so I decided to take a look.
The unit has a central PCB that's not too difficult to extract - desoldering the wires to the speaker on the other half of the plastic case makes things easier.
There's about 7 Nichicon-branded caps on the board and I replaced them all using parts salvaged from our scrap development stock (mixed brands - we design digital/analogue audio kit so there was a lot stuff around) and the unit's working fine again. The unit had a couple of 56uF 63V DC blocking caps which I couldn't match, so I used 47uF 63V ones with no apparent ill effects. Can't say whether I had bad caps or just one/some that failed for un-related reasons.
The Mitel circuit board was multilayer with some very thick ground planes and I had difficulty working on it - in the end I used a temperature controlled iron cranked all the way to 450C (!!) and carefully pulled out the old caps and then VERY carefully drilled out the solder using a 0.7mm drill bit as it was proving very hard to get enough heat on the joints for a solder sucker to work.
Hope this is of use - as I said the conference units are not cheap (about £270 upwards), so a fix costing perhaps £2 and about 30 mins of time is well worth it.
Our Mitel 5310 telephone conference saucer (speaker unit) just died - the power light would come on for a fraction of a sec, then go off, there would be a quick 'click', and then the cycle would repeat. These units aren't cheap so I decided to take a look.
The unit has a central PCB that's not too difficult to extract - desoldering the wires to the speaker on the other half of the plastic case makes things easier.
There's about 7 Nichicon-branded caps on the board and I replaced them all using parts salvaged from our scrap development stock (mixed brands - we design digital/analogue audio kit so there was a lot stuff around) and the unit's working fine again. The unit had a couple of 56uF 63V DC blocking caps which I couldn't match, so I used 47uF 63V ones with no apparent ill effects. Can't say whether I had bad caps or just one/some that failed for un-related reasons.
The Mitel circuit board was multilayer with some very thick ground planes and I had difficulty working on it - in the end I used a temperature controlled iron cranked all the way to 450C (!!) and carefully pulled out the old caps and then VERY carefully drilled out the solder using a 0.7mm drill bit as it was proving very hard to get enough heat on the joints for a solder sucker to work.
Hope this is of use - as I said the conference units are not cheap (about £270 upwards), so a fix costing perhaps £2 and about 30 mins of time is well worth it.
