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MRC1300 Testing??

 

Just rec'd a MRC1300 for my yet to be assembled Z trains (MARKLIN) Wanted to test output. Got 19.6vAC for accessories terminals. The DC output is a constant 15.6vDC, not affected by dial position. Is this a wrong test? Does the controller need to be connected to track/engine to get accurate results? Did I buy a defective unit on ebay? Only the shadow knows,...or one of you out there. Help me out please.
 

most likely blown output transistor.
?
just to double check, get an automotive 12v bulb (that can be sacrificed) and try it... you will know if it is constant output or not.
?
Greg
 

My Tech II Railroad Power 1400 also reads in the range but with the logo on the track it goes virtually zero. The wiring inside shows that there are a tap in the potentiometer for speed that controls when the pulse power drops out so I think this is something like Rokuhan did in their controller. There’s pulses enough to keep LED lights on and a passenger car that say, but certainly not run the locomotive.

Jeff Merrill
408.888.1551
BAZ BoyZ (a.k.a. NorCal Z)


On Sun, Jan 19, 2025 at 2:19?PM Greg Elmassian via <greg=[email protected]> wrote:
most likely blown output transistor.
?
just to double check, get an automotive 12v bulb (that can be sacrificed) and try it... you will know if it is constant output or not.
?
Greg


--

Jeff
NorCal Z (Sacramento)
’San Francisco Bay Area Z’
a.k.a. 'The BAZ BoyZ'
 

Thanks Greg, will try that tonite.

DH

On Sunday, January 19, 2025, 05:19:52 PM EST, Greg Elmassian <greg@...> wrote:


most likely blown output transistor.
?
just to double check, get an automotive 12v bulb (that can be sacrificed) and try it... you will know if it is constant output or not.
?
Greg
 

Failed the bulb test and further research showed using the multimeter to test for variable voltag was the right way. ?Seller gracious & refunded $ with an apology.

DH

On Sunday, January 19, 2025, 05:19:52 PM EST, Greg Elmassian <greg@...> wrote:


most likely blown output transistor.
?
just to double check, get an automotive 12v bulb (that can be sacrificed) and try it... you will know if it is constant output or not.
?
Greg
 

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Just a heads up. I am hearing multiple reports of older MRC1300s failing. Some have even damaged AZL locos due to the higher voltage output of a failed device. I would be very caution using older MRC1300s, or purchasing these 2nd hand as there could be folks looking to dump failed controllers.?

Rob

“Zeeing is believing…"

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On Jan 20, 2025, at 11:45?PM, Douglas Howard via groups.io <enfieldclassic@...> wrote:

Failed the bulb test and further research showed using the multimeter to test for variable voltag was the right way. ?Seller gracious & refunded $ with an apology.

DH

On Sunday, January 19, 2025, 05:19:52 PM EST, Greg Elmassian <greg@...> wrote:


most likely blown output transistor.
?
just to double check, get an automotive 12v bulb (that can be sacrificed) and try it... you will know if it is constant output or not.
?
Greg
 
Edited

?
Thanks. ?I am getting a new in box MRC 1300. ?I am having a voltage restrictor added by a friend to hold max voltage to 11 v DC to prevent any surges or accidental over throttling.
?
DH
 

If somebody can send me one, I can quickly get the technical data
e.g.
Waveforms (Unloaded, pure under pure resistances range)
Low voltage 'Pulse-Power'
Peak 'spikes'
Short handling
Actual running on my Test Tracks
etc.
?
Turn around week or less
?
email: BAZboyZ.SF@...
--

Jeff
NorCal Z (Sacramento)
’San Francisco Bay Area Z’
a.k.a. 'The BAZ BoyZ'

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