LTC Dimmer repair

[pumphouse]

I have a Zero 88 LTC rack at my venue with 3 channels that resolutely refuse to turn off unless I switch the channel breaker off (or the dimmer supply). I suspect blown triacs in the power modules. The rest of the rack works fine, and the 3 dodgy channels are 13,19 and 20 so are spread across phases and power/control modules.

 

Just before I get my screwdrivers out and have a delve, can someone advise me on what part number/specification the triacs are (so I can order some replacements) and also if they are easy or hard to get at and replace.

 

I know they are fairly straightforward to do on a Paradim dimmer (unless the sprung terminal block springs off the pcb!).

 

All information (especially from the nice man at Zero 88) would be gratefully received.

 

Thanks in advance.

 

Jason

[Eric]

The power module is basically a Mk1 Beta in a different case.

The triac for these are BTA 40 600a/b.

 

To assess the triacs you remove the front panel of the dimmer.

Should be held in place with the 4 screws that hold the handles in place as well.

 

 

From what you have said you may find that only channel 13 may be a triac fault.

Channels 19 and 20 may be a problem with the sync circuit on the main PCB.

Main PCB is found by removing the rear panel. There are about 6 screws holding this in place.

From there is would be worth either contacting me direct to talk you through what you should be looking for.

[pumphouse]

Thanks for the informative reply.

 

I will contact you directly for another steer once I have had a quick look.

 

I might just let the current show finish before I go poking about inside though! This will be a week or so.

 

Jason