Created Date: December 28,2014

Created by: Tinker

I have a DL-105 & with good 120 power at the input, but the PLC does not power up.

I have opened it up hoping to find a blown fuse, but don't see one.

Is there a fuse on-board, or do I have to start testing electronic components to find the outage?:(

You do realize there are "no user serviceable parts inside " right?

That said, I suspect R1 is a "fusible resistor ", I just checked a working 105 and R1 was 10 ohms, you might check yours, but if it is open, there has to be a reason why. I just took a look at a printed DL105 manual I have, no schematic of the power supply of course, not even a block diagram. However, the copyright on the manual is 1996, suggesting the DL105 design is around 20 years old. No doubt some upgrades have been done over the years, but I think you may have some difficulty finding single unit quantities of some of the old parts.

Since you have relay outputs you can't be using any high speed output functions, how about "high " speed input? if not, personally I'd transcribe the program to a CLICK, if that is not an option, then I'd recommend just buying a new 105.

I understand the desire to repair the thing, in fact I'm on my way to put a new '06 in machine to replace one with bad relays. Once I have the old one out, I will pry it apart, and if I can find relays, I will solder new ones in, and keep the ting for a spare, but I did buy a new PLC first to keep the machine running.

Created Date: December 29,2014

Created by: Tinker

Tinker,

I just checked R1, of the 8 connections, a few were 0 ohms to each other & others were infinite. On yours, what were the readings per connection?

Well, like I said, there have no doubt been some updates over the years (or my dyslexia struck again) On the unit I looked at R1 (At least I think it was marked R1, in any case, the first component the Line terminal trace connects to) is a two axial lead cylindrical device that looks like a wire wound resistor (and no doubt that is what it is, with a "flame proof " outer coating allowing it to be used as a fuse, I only mentioned it because you were looking for a fuse)

With only two leads, there was only one pair of points to measure and I got 10ohms.

An 8 lead resistor would be a resistor array and perhaps relatively unlikely to be part of the power supply, certainly not on the high voltage side.