71001872 CNTRL-ELEC

71001872 CNTRL-ELEC

Dim numbers but oven seems to be working ok

The clock numbers are very dim but the oven(s) seem to be working OK. This unit was replaced once before about 5 years ago with the same symptoms. All the tech did was replace the module for $225.  I was reluctant to do that before because once I bought it I owned it.  Any ideas of a fix without spending min $140 for a new module?

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71001872 CNTRL-ELEC

Product Troubleshooting for 71001872 CNTRL-ELEC


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A replacement clock unit is available but costs $150-200 and is rather simple to replace - I've replaced mine twice in the past 5 or so years.The original and replacement both began to dim at 3-4 years and eventually became so dim they were unreadable. Someone here, I believe, suggested that one or more of the capacitors may have became defective due to the high temperatures above the oven. Replacements for the four suspect capacitors were very reasonably priced but it was difficult locating appropriate high-temprature capacitors. The only trick to removing and replacing the clock unit is the ribbon connector on the clock circuit board. There are very small plastic ears or tabs at the extreme ends of the connector. Press toward the center of the connector and pull away from the board (about 1/8") to release the ribbon cable. Replacing capacitors C3, 4, & 7 is straight forward EXCEPT the circuit traces are prone to pull from the board (use as little heat as possible, wick as much solder as possibe before trying to dislodge the capacitors, and watch polarity). C1 a BIG challenge since the solder side is under the display assembly. I used a VOM to locate alternate connecting points on the component side of the board and just let the leads support C1. Total repair time was about 1-2 hours and savings around $150 - AND it now works perfectly.
I have the same identical problem. I replaced the original unit in 2004 due to a failure of the display panel. Now in 2009 the replacement unit has become extremely dim, though the board functions normally. I will pull the unit this weekend and see if I can find the appropriate capacitors on the http://www.alliedelec.com/ website (that's Allied Radio for you old-timers...) Do you happen to have the capcitor values and temperature limits available for posting here? Thanks for the assistance with this annoying problem!

Research, Knowledge and Information :


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