The first Fixed out I had been using quit working. Internal fuse is OK. Was told if I put a jumper on the 2 fixed inputs I could get 2nd fixed output to work. This got me going again.
The question is was this failure a common problem, and what fixes it?
Thanks for the help - Ckuck
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What revision of the TIU are you using? By "quit working" do mean it no longer passes power to the output from the input? Or are you talking about the DCS signal no longer functions on that channel?
How are you powering the tiu? Thru AUX or FIXED 1?
If a fixed channel is not passing power you could have an open fuse, broken terminal wire, open trace, or a relay that some how went bad and is stuck open. G
RagBran,
Power your TIU thru Aux, if it still does not work check the fuse, and replace it if broken. If it still does not work, send the TIU to GGG and have him repair it.
PCRR/Dave
gunrunnerjohn posted:What revision of the TIU are you using? By "quit working" do mean it no longer passes power to the output from the input? Or are you talking about the DCS signal no longer functions on that channel?
The TIU is revision L. There seems to be the normal voltage on the fixed out, but no DCS communication to trains.
Thanks for the quick reply
RJR posted:How are you powering the tiu? Thru AUX or FIXED 1?
Using a power brick through Fixed 1
I'm sure you've tried this but just in case.... Menu/System/DCS set up/ AON (all channels on)
GGG posted:If a fixed channel is not passing power you could have an open fuse, broken terminal wire, open trace, or a relay that some how went bad and is stuck open. G
Fuses check OK. Power at output, but no DCS signal to trains
Gregg posted:I'm sure you've tried this but just in case.... Menu/System/DCS set up/ AON (all channels on)
will look at that
If you set all channels on and you get no DCS signal on channel one only, it's probably time for a repair. GGG in the forum has all the parts and lots of experience beating these back into submission. 
Ok, Your original post was not very clear and I thought you had no power out on fixed 1. If no DCS signal on Fix1 but F2 is working (and VAR1 and 2). Most likely a chip on fixed 1 needs to be replaced. It can be repaired. G
GGG posted:Ok, Your original post was not very clear and I thought you had no power out on fixed 1. If no DCS signal on Fix1 but F2 is working (and VAR1 and 2). Most likely a chip on fixed 1 needs to be replaced. It can be repaired. G
Interesting information. How would one go about determining that there REALLY is no DCS signal coming out of a specific channel? Just keep trying different DCS locomotives on those tracks powered by that specific TIU channel in question?
Interesting information. How would one go about determining that there REALLY is no DCS signal coming out of a specific channel? Just keep trying different DCS locomotives on those tracks powered by that specific TIU channel in question?
Quick answer would be,, The engines always starts up in conventional mode with lights and sounds.
Under DCSc set up there are many options. Each cannel can have the signal on or off. It's not likely the signal was accidently turned off. (possible but not likely)
Even with a low dcs signal of 2 or 3 a dcs engine will probably obey most commands , however the low signal would not be enough to add a engine.
If I remove jumpers from Fixed 1 and Fixed 2, and feed input Fixed 1 and output Fixed 1 to track, all 5 trains on layout fire up in conventional.
Chuck
GGG posted:Ok, Your original post was not very clear and I thought you had no power out on fixed 1. If no DCS signal on Fix1 but F2 is working (and VAR1 and 2). Most likely a chip on fixed 1 needs to be replaced. It can be repaired. G
Problem: TIU out on F1 and F2 only starts conventional
With F1 and F2 in jumperd, F2 0ut is OK DCS. F1 is conv
Voltage: F1 in =18.9 F1 out =18.6 F2 in =18.9 F2 out = 18.9
Tks - Chuck
gunrunnerjohn posted:If you set all channels on and you get no DCS signal on channel one only, it's probably time for a repair. GGG in the forum has all the parts and lots of experience beating these back into submission.
I suspect that should be next move
As George (GGG) says, it's probably the chip that injects the DCS signal on the channel, I've had to replace two of them in the past few months.
Hot Water posted:Interesting information. How would one go about determining that there REALLY is no DCS signal coming out of a specific channel? Just keep trying different DCS locomotives on those tracks powered by that specific TIU channel in question?
Wasn't there a "parlor trick" where you put a pocket AM radio near the track and you can hear bursts of static when there's DCS activity? Not suggesting it's conclusive test (and who has an AM radio anymore) but if you're a Macgyver fan it might be amusing to compare a track driven by Fixed 2 (DCS supposedly OK) with the same track driven the Fixed 1 (DCS supposedly absent).
gunrunnerjohn posted:As George (GGG) says, it's probably the chip that injects the DCS signal on the channel, I've had to replace two of them in the past few months.
Are the chips plugins? Can I get the chips and replace them?
Tks again
C
The chips are soldered to the board, you'll probably want someone that has the tools and skills replace it. There is one chip for each channel.
gunrunnerjohn posted:The chips are soldered to the board, you'll probably want someone that has the tools and skills replace it. There is one chip for each channel.
What would be the best way to contact George (GGG) for shipping directions, price, and how long for repair?
You all have been very helpful. Thanks
Chuck
His email is in his profile. George knows his stuff, probably better than anyone.
E-mail in profile as Ralph mention. Reason F2 doesn't work by itself is that the TIU needs power to generate the DCS signal. That only happens when F1 is powered or Aux power. Applying power to F2 alone just lets power go to track, but TIU Is off (LED Out). Since F2 and I assume VAR1 and 2 would generate a DCS signal when power applied, it is a repair to the F1 channel. G
GGG posted:E-mail in profile as Ralph mention. Reason F2 doesn't work by itself is that the TIU needs power to generate the DCS signal. That only happens when F1 is powered or Aux power. Applying power to F2 alone just lets power go to track, but TIU Is off (LED Out). Since F2 and I assume VAR1 and 2 would generate a DCS signal when power applied, it is a repair to the F1 channel. G
I haven't figured how to get to your profile to find E-mail address. Will be in touch when I do
Tks
Chuck
Chuck, click on this link: GGG and scroll down to the Display Email.
gunrunnerjohn posted:Chuck, click on this link: GGG and scroll down to the Display Email.
Thanks for all the feedback John. Have the e-mail and will make arrangements for the repair
Chuck
stan2004 posted:Hot Water posted:Interesting information. How would one go about determining that there REALLY is no DCS signal coming out of a specific channel? Just keep trying different DCS locomotives on those tracks powered by that specific TIU channel in question?
Wasn't there a "parlor trick" where you put a pocket AM radio near the track and you can hear bursts of static when there's DCS activity? Not suggesting it's conclusive test (and who has an AM radio anymore) but if you're a Macgyver fan it might be amusing to compare a track driven by Fixed 2 (DCS supposedly OK) with the same track driven the Fixed 1 (DCS supposedly absent).
DCS seen via AM:
And it's something you can try in the privacy of your own home! 
Without the benefit of an oscilloscope or some other expensive tool, this can let you know if the DCS signal is making it out to the track. As mentioned earlier there is a 50 cent chip that buffers/drives the DCS signal onto the track but it can fail for whatever reason. But it's a so-called surface-mount IC chip and not in a socket so requires quite the soldering skill to replace - best left to experts like GGG.
Hmmm...i wonder where said chip is for us DIY's
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