| Author |
Message |
    
Junkbarren
| | Posted on Sunday, October 27, 2002 - 12:17 pm: | 
|
i have a 2970dx with a problem. it works fine when it is on, but if i turn it off and turn it back on the memory is gone and i have to program the channels i use back in. is there a cap. in it that keeps the memory charged when it is turned off? if there is which one is it? any help greatly appreciated. thanks--i have no papers on it |
Ss8541
| | Posted on Sunday, October 27, 2002 - 9:54 pm: |
|
on the microprocessor board, near the interconnecting pins you will find a 220uf electrolytic cap(its non-smt to make it easier). you can see it without taking the processor board out of the radio(look at processor board with spkr side of radio off). this should be your memory backup cap. |
Inspector
| | Posted on Tuesday, October 29, 2002 - 5:38 pm: |
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220uF doesn't sound very big... Could a much larger value cap be used for longer duration of the memory? say a 0.2F??? |
Ss8541
| | Posted on Tuesday, October 29, 2002 - 10:15 pm: |
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sure could inspector. i just made a post at panther about using the the 'real' memory caps(like the ones used in vcr, etc circuits to keep clock time, etc) that you mentioned above in a 2510/lincoln to extend its memory. will work with the dx radios also. you'll just need to find a place to mount these bigger size caps. whoever designed the pres. george put this into their plans at the drawing board, since it comes stock with a 'real' memory cap. |
307
| | Posted on Wednesday, October 30, 2002 - 8:24 pm: |
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Ss8541 is 'da man...
307 |
Junkbarren
| | Posted on Sunday, November 03, 2002 - 12:51 am: |
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thanks for the info. i needed it. |
N3nfx
New member
Username: N3nfx
Post Number: 1
Registered: 4-2005
| | Posted on Thursday, May 25, 2006 - 8:39 pm: |
|
Seeing the same issue with an older 2950. Anyone know if this post applies to the older radios aswell? Radio was one of the first radios I bought and had the chance to acquire it again, installed it in my boat. |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1527
Registered: 7-2004
| | Posted on Thursday, May 25, 2006 - 9:50 pm: |
|
Order radios- check 3V battery.
Want long life, use a lithium battery. |
N3nfx
New member
Username: N3nfx
Post Number: 2
Registered: 4-2005
| | Posted on Friday, May 26, 2006 - 8:41 am: |
|
RW, is this battery located on the board behind the display? |
Tech808
Moderator
Username: Tech808
Post Number: 10105
Registered: 8-2002
| | Posted on Friday, May 26, 2006 - 9:55 am: |
|
N3nfx,
Yes the battery is just under the black piezo-buzzer if it is the 13Z board.
Lon
Tech808
CEF808
N9CEF
CVC#2 |
N3nfx
New member
Username: N3nfx
Post Number: 3
Registered: 4-2005
| | Posted on Friday, May 26, 2006 - 6:48 pm: |
|
Thanks Lon, that's the one I had in mind. Kinda tough to visualize it and have it make sense.
73,
Rob |
N3nfx
New member
Username: N3nfx
Post Number: 4
Registered: 4-2005
| | Posted on Friday, June 09, 2006 - 2:26 pm: |
|
Found, replaced battery. Radio seemed to hold memory for about a week, now back to the same problem. Radio is installed in a boat with DC power to the electronics switched off when not in use, didn't think this would be an issue since the radio has a battery to keep these perameters, correct? What could be causing premature battery drain? |
