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Author Topic: My IC-751A RAM problem but battery is good  (Read 579 times)
HA5BZR
Member

Posts: 68




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« on: March 10, 2008, 08:00:53 AM »

I have a IC-751A transceiver,at the moment not working,maybe RAM problem?
Earlier I had a contact error in RAM board so
I did the folloiwng things:
I moved the RAM board out and resoldered J16 and J17 and put back to its place.
I realised that if I change the VFO main dial interestings character and frequency is on the display:Other things:
If I change the VFO main dial:the numbers light sometimes very strong similar to 8888888888
Details:
In HAM mode normally I have to change between 9 band:1,8  3,5  7  10  14   18  21  24 and 28MHz
 If  I push BAND button and I turn the VFO clockwise  :I can see 1.051.5    3.551.5    7.051.5     160.647.0     14.647.0      21.047.0     24.547.0     and 28.047.0
No 10 and 18MHz and the numbers of light are very strong?Why? I hope the display will not burn out?
 
In GENE mode: If  I push BAND button and I turn the VFO ,I can see:1.047.0     2.047.0    3.047.0     ...... until 30.047.0
But If I turn VFO further clockwise I can see   31.047.0 .....and  Frequency is stepping in 1MHz  but very high frequency until 999.047.0 :For example: 146.047.0    I can see 499.047     895.047 also on the display
 
If I transmit on 7145kHz ,the stations hear me on 7284kHz  this is 140kHZ up
If I transmit on 14.188kHZ, the station hear me on 14.248   this is 60kHz up
if I transmit on 21.047 ,the station hear me 21.187     this is 140kHz up
if I transmit on 21.187   the station hear me on  21.247     this is 60kHZ up
if I transmit on   24.950  the station hear me on      25.090     this is 140kHz up
 if I transmit on   28.400  the station hear me on      28540       this is  140kHz up
 
What do you suggest?How can I check that RAM is good or not?Could I damage the some gates of IC on the RAM board if I resoldered the J16 and J17 pin on the RAM board?Because I did' t move the battery.
May  under 3V voltage soldering case the problem?
Hardware problem or only reprogramming is needed?
                                                                            Thanks :Laszlo  HA5BZR
 
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S58F
Member

Posts: 9




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« Reply #1 on: March 28, 2008, 01:39:27 AM »


Few links ..maybe something help you:

http://www.ham.dmz.ro/icom/ic-751-cooling-remote-jacks.php
http://www.geocities.com/emailsrikanth/ham/icomram/RAM.html
This is very nice think if you have problem with RAM:
http://www.piexx.com/index.php?main_page=product_info&cPath=8&products_id=26


EriC S58F

PS.

If the RAM battery is good ..I not know have to help you but maybe you finde on this links something.  
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