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Author Topic: Yaesu FT-901dm Memory Module not working?..  (Read 1750 times)
ZS5WC
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Posts: 410


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« on: January 16, 2013, 02:41:43 AM »

 Huh

I have just repaired a FT-901dm from 1978/79 vintage, but it would seem the memory function is not working?.
I can store the memory, but when I want to recall the memory by pressing MR / TX or RX the VFO still seems to remain active.
Could it be that the WRITE line to the BCD counter is permanently HIGH, thus storing and relaying the VFO frequency directly?.

I had an FT-107m where this function worked just fine--any ideas what the problem could be?.

73 de William
ZS5WC / ZS4L
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KA4POL
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Posts: 1978




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« Reply #1 on: January 16, 2013, 03:35:30 AM »

Sounds pretty much like a backup battery problem.
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ZS5WC
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« Reply #2 on: January 16, 2013, 04:55:46 AM »

Rigs of this vintage had memory batteries?..

With the rig on, (if it had a battery) the battery backup should not be a problem.
It is as if the VFO is permanently active.
Were these module an option on these rigs?.

William
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KA4POL
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Posts: 1978




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« Reply #3 on: January 16, 2013, 07:52:03 AM »

My 1980 IC-1271 has one. But it seems the FT-901 is different.
There is a FT-901 Yahoo group which might have good information.
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W9GB
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Posts: 2623




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« Reply #4 on: January 16, 2013, 08:55:29 AM »

Fox-Tango International has a web page dedicated to this model, and its variations / production changes.
http://foxtango.org/FT901/FT-901-902%20Web%20Page.htm

Survival Guide (PDF)
http://foxtango.org/Files/FT-901DMsg.pdf
« Last Edit: January 16, 2013, 08:58:28 AM by W9GB » Logged
W3HKK
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Posts: 596




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« Reply #5 on: January 31, 2013, 07:01:17 PM »

My 901DM from c. 1979 has the same problem. Began maybe 5 yrs ago.   It keeps blinking but no more single memory function.  I have an external vfo so dont really use  the single memory.  Still, it would be interesting to know the problem/repair needed.

Good hunting. 

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W3HKK
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« Reply #6 on: January 31, 2013, 07:03:27 PM »

Come to think of it, I tried the 902DM memory and get the same problem...blinks. Never acquires the freq.

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