What I found at work today...

[Elysarian]

Got called out to a camera (CCTV) fault today - customer report was 4 cameras offline in the same area.

This is what I found when I opened the PSU (an Elmdene 12v, 3A boxed unit):



Personally haven't heard of that brand of cap myself but I've flagged the job for a follow-up to replace the PSU with a 5A unit (I've always specced 1A per camera myself and although the draw on this *should* only be 2A judging by the resistance reading on my meter you have to account for impulse currents when the IR lamps switch on).

There was a layer of soot in the bottom of the case too and the output volts were reading 3v (I didn't even bother checking the ripple!).

[Pentium4]

Re: What I found at work today...

Wow! That thing went out with a bang Haven't heard of that brand either

[goontron]

Re: What I found at work today...

hmm it was a sad looking unit before the pop, look at that not even a bridge rectifier and is that spring supposed to be ground?
also the small blue cap under the "incap" is popped to, its not feasible to repair mainly because the "incap" thats 8800㎌ cost the same amount as a new power box.
not good!

[klkmalik]

Re: What I found at work today...

This problem means High voltage going to shorting main diode and busting main caps. should be test diode. caps,switching transistor. but before you test, you must connect Ac lamp 100 or 80 watts in fuse holder. If the bulb is bright still short component if the board
good bulbs dim/

[Elysarian]

Re: What I found at work today...

hmm it was a sad looking unit before the pop, look at that not even a bridge rectifier and is that spring supposed to be ground?
also the small blue cap under the "incap" is popped to, its not feasible to repair mainly because the "incap" thats 8800㎌ cost the same amount as a new power box.
not good!

They are cheapo units TBF, we never repair them - their bigger units do have a proper bridge in them IIRC.

The spring isn't a ground contact though, it's a tamper (case open) switch for connecting the unit to an intruder alarm system - grounding is via the regulator heatsink (the Alu part wrapped around the PCB).

Missing components are for a fault relay that isn't fitted in this particular model (the back EMF diode screenprint is visible near the relay output terminals).

[mockingbird]

Re: What I found at work today...

Looks like that "incap" has turned into an "outcap".

[delaware74b]

Re: What I found at work today...

Incap - 'incap'able of holding its guts inside for long......

[c_hegge]

Re: What I found at work today...

^
Of course