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ICOM IC735 lithium battery
I have a 13 year old IC735. In the manual it says the
lithium battery is good for 5 years. After that it should be monitored closely and replaced as needed. The battery has not been changed in the 13 years. So I am thinking its time to replace it. The manual says it is used for the memory that holds the frequencies and setup. And that it should be replaced by Icom. At this time the radio remembers all the setups and frequenies when powered down. So it appears to still be functioning. What happens if I remove the battery with the power off? Do I loss just the setup? Or do I loss the operating system for the radio? Thanks in advance for any information. Derek Toeppen, WA0ZTI |
Derek Toeppen wrote: I have a 13 year old IC735. In the manual it says the lithium battery is good for 5 years. After that it should be monitored closely and replaced as needed. The battery has not been changed in the 13 years. So I am thinking its time to replace it. The manual says it is used for the memory that holds the frequencies and setup. And that it should be replaced by Icom. At this time the radio remembers all the setups and frequenies when powered down. So it appears to still be functioning. What happens if I remove the battery with the power off? Do I loss just the setup? Or do I loss the operating system for the radio? I am going to make an assumption that this is the same or similar setup that is used in the IC-745. I had one several years ago and changed the battery and you really need to be careful. You should get a 3 volt source and tack solder it across the points on the circuit board where the existing lithium battery is connected. You may want to do the tack soldering on the same circuit trace but away from where the lithium cell is soldered in. Remove the lithium cell and replace it with the new one. Then remove the tack solder leads and you should be set for another 10 years or so. If you remove the lithium cell without the backup, you will lose the radio programming and it must be sent back to Icom for reprogramming. If you do blow the programming, you need not send the entire radio (at least on the IC745). As I recall, the memory board is socketed into the main board so all you need send back is the memory board. I went to Radio Shack and purchased a two AA cell battery back, soldered the leads onto that with some fresh AA's and the battery replacement went just fine. It is quite easy to lose the programming though. A good friend of mine, who is a very meticulous technician, lost the programming on his IC745. Perhaps his solder connection wasn't good or he lost the memory voltage for a split second, but he had to send the memory board back to Icom. If your radio is 13 years old and the memory is on the same battery, I would definitely make arrangements to replace that battery. Andy WD4KDN -- "People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." George Orwell |
Derek Toeppen wrote: I have a 13 year old IC735. In the manual it says the lithium battery is good for 5 years. After that it should be monitored closely and replaced as needed. The battery has not been changed in the 13 years. So I am thinking its time to replace it. The manual says it is used for the memory that holds the frequencies and setup. And that it should be replaced by Icom. At this time the radio remembers all the setups and frequenies when powered down. So it appears to still be functioning. What happens if I remove the battery with the power off? Do I loss just the setup? Or do I loss the operating system for the radio? I am going to make an assumption that this is the same or similar setup that is used in the IC-745. I had one several years ago and changed the battery and you really need to be careful. You should get a 3 volt source and tack solder it across the points on the circuit board where the existing lithium battery is connected. You may want to do the tack soldering on the same circuit trace but away from where the lithium cell is soldered in. Remove the lithium cell and replace it with the new one. Then remove the tack solder leads and you should be set for another 10 years or so. If you remove the lithium cell without the backup, you will lose the radio programming and it must be sent back to Icom for reprogramming. If you do blow the programming, you need not send the entire radio (at least on the IC745). As I recall, the memory board is socketed into the main board so all you need send back is the memory board. I went to Radio Shack and purchased a two AA cell battery back, soldered the leads onto that with some fresh AA's and the battery replacement went just fine. It is quite easy to lose the programming though. A good friend of mine, who is a very meticulous technician, lost the programming on his IC745. Perhaps his solder connection wasn't good or he lost the memory voltage for a split second, but he had to send the memory board back to Icom. If your radio is 13 years old and the memory is on the same battery, I would definitely make arrangements to replace that battery. Andy WD4KDN -- "People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." George Orwell |
On Wed, 28 Jan 2004 17:21:37 -0500, Nitespark
wrote: If your radio is 13 years old and the memory is on the same battery, I would definitely make arrangements to replace that battery. Andy WD4KDN FWIW, I'm finally replacing the still-going-strong lithium battery in my 20-year-old Icom 735, mainly because it is in the shop anyway, for other work. A few years back, an Icom technician told me the current drain is 15-20 nano-amps, and being a 180 mah battery, the estimated life works out to 600 years or so!! Bob k5qwg |
On Wed, 28 Jan 2004 17:21:37 -0500, Nitespark
wrote: If your radio is 13 years old and the memory is on the same battery, I would definitely make arrangements to replace that battery. Andy WD4KDN FWIW, I'm finally replacing the still-going-strong lithium battery in my 20-year-old Icom 735, mainly because it is in the shop anyway, for other work. A few years back, an Icom technician told me the current drain is 15-20 nano-amps, and being a 180 mah battery, the estimated life works out to 600 years or so!! Bob k5qwg |
On Wed, 28 Jan 2004 17:21:37 -0500, Nitespark
wrote: Derek Toeppen wrote: I have a 13 year old IC735. In the manual it says the lithium battery is good for 5 years. After that it should be monitored closely and replaced as needed. The battery has not been changed in the 13 years. So I am thinking its time to replace it. The manual says it is used for the memory that holds the frequencies and setup. And that it should be replaced by Icom. At this time the radio remembers all the setups and frequenies when powered down. So it appears to still be functioning. What happens if I remove the battery with the power off? Do I loss just the setup? Or do I loss the operating system for the radio? I am going to make an assumption that this is the same or similar setup that is used in the IC-745. I had one several years ago and changed the battery and you really need to be careful. You should get a 3 volt source and tack solder it across the points on the circuit board where the existing lithium battery is connected. You may want to do the tack soldering on the same circuit trace but away from where the lithium cell is soldered in. Remove the lithium cell and replace it with the new one. Then remove the tack solder leads and you should be set for another 10 years or so. If you remove the lithium cell without the backup, you will lose the radio programming and it must be sent back to Icom for reprogramming. If you do blow the programming, you need not send the entire radio (at least on the IC745). As I recall, the memory board is socketed into the main board so all you need send back is the memory board. I went to Radio Shack and purchased a two AA cell battery back, soldered the leads onto that with some fresh AA's and the battery replacement went just fine. It is quite easy to lose the programming though. A good friend of mine, who is a very meticulous technician, lost the programming on his IC745. Perhaps his solder connection wasn't good or he lost the memory voltage for a split second, but he had to send the memory board back to Icom. If your radio is 13 years old and the memory is on the same battery, I would definitely make arrangements to replace that battery. Andy WD4KDN NO The 735 battery only retains the programmed memories the operator programmed it is not like the IC-745, 751, 751A, 76,1 R71A, 271A / H, 471A / H, 1271A , M700, M700TY where if the battery expires the frequency set up for those transceivers goes away. If the IC-735 battery dies all your programmed memory channels with revert back to 28 MHz frequencies. Gary K8IZ Washington State Resident Registered Linux User # 312991 |
On Wed, 28 Jan 2004 17:21:37 -0500, Nitespark
wrote: Derek Toeppen wrote: I have a 13 year old IC735. In the manual it says the lithium battery is good for 5 years. After that it should be monitored closely and replaced as needed. The battery has not been changed in the 13 years. So I am thinking its time to replace it. The manual says it is used for the memory that holds the frequencies and setup. And that it should be replaced by Icom. At this time the radio remembers all the setups and frequenies when powered down. So it appears to still be functioning. What happens if I remove the battery with the power off? Do I loss just the setup? Or do I loss the operating system for the radio? I am going to make an assumption that this is the same or similar setup that is used in the IC-745. I had one several years ago and changed the battery and you really need to be careful. You should get a 3 volt source and tack solder it across the points on the circuit board where the existing lithium battery is connected. You may want to do the tack soldering on the same circuit trace but away from where the lithium cell is soldered in. Remove the lithium cell and replace it with the new one. Then remove the tack solder leads and you should be set for another 10 years or so. If you remove the lithium cell without the backup, you will lose the radio programming and it must be sent back to Icom for reprogramming. If you do blow the programming, you need not send the entire radio (at least on the IC745). As I recall, the memory board is socketed into the main board so all you need send back is the memory board. I went to Radio Shack and purchased a two AA cell battery back, soldered the leads onto that with some fresh AA's and the battery replacement went just fine. It is quite easy to lose the programming though. A good friend of mine, who is a very meticulous technician, lost the programming on his IC745. Perhaps his solder connection wasn't good or he lost the memory voltage for a split second, but he had to send the memory board back to Icom. If your radio is 13 years old and the memory is on the same battery, I would definitely make arrangements to replace that battery. Andy WD4KDN NO The 735 battery only retains the programmed memories the operator programmed it is not like the IC-745, 751, 751A, 76,1 R71A, 271A / H, 471A / H, 1271A , M700, M700TY where if the battery expires the frequency set up for those transceivers goes away. If the IC-735 battery dies all your programmed memory channels with revert back to 28 MHz frequencies. Gary K8IZ Washington State Resident Registered Linux User # 312991 |
Gary P. Fiber wrote in message . ..
Gary, I am inclined to think you are correct. The battery only supplies power to the CPU. Not an external memory. The CPU has an EPROM window. So I think the radio programming is in ROM. And the limited RAM inside the CPU only holds user programmed frequenies. But I could be wrong. It could hold calibration factors or frequency range information for the PLL. Have you tried this on an IC-735 yourself? P.S. The current drain from the CPU must be very low. The 13 year old battery has a voltage of 2.946 volts under load. Its still going strong. On Wed, 28 Jan 2004 17:21:37 -0500, Nitespark wrote: Derek Toeppen wrote: I have a 13 year old IC735. In the manual it says the lithium battery is good for 5 years. After that it should be monitored closely and replaced as needed. The battery has not been changed in the 13 years. So I am thinking its time to replace it. The manual says it is used for the memory that holds the frequencies and setup. And that it should be replaced by Icom. At this time the radio remembers all the setups and frequenies when powered down. So it appears to still be functioning. What happens if I remove the battery with the power off? Do I loss just the setup? Or do I loss the operating system for the radio? I am going to make an assumption that this is the same or similar setup that is used in the IC-745. I had one several years ago and changed the battery and you really need to be careful. You should get a 3 volt source and tack solder it across the points on the circuit board where the existing lithium battery is connected. You may want to do the tack soldering on the same circuit trace but away from where the lithium cell is soldered in. Remove the lithium cell and replace it with the new one. Then remove the tack solder leads and you should be set for another 10 years or so. If you remove the lithium cell without the backup, you will lose the radio programming and it must be sent back to Icom for reprogramming. If you do blow the programming, you need not send the entire radio (at least on the IC745). As I recall, the memory board is socketed into the main board so all you need send back is the memory board. I went to Radio Shack and purchased a two AA cell battery back, soldered the leads onto that with some fresh AA's and the battery replacement went just fine. It is quite easy to lose the programming though. A good friend of mine, who is a very meticulous technician, lost the programming on his IC745. Perhaps his solder connection wasn't good or he lost the memory voltage for a split second, but he had to send the memory board back to Icom. If your radio is 13 years old and the memory is on the same battery, I would definitely make arrangements to replace that battery. Andy WD4KDN NO The 735 battery only retains the programmed memories the operator programmed it is not like the IC-745, 751, 751A, 76,1 R71A, 271A / H, 471A / H, 1271A , M700, M700TY where if the battery expires the frequency set up for those transceivers goes away. If the IC-735 battery dies all your programmed memory channels with revert back to 28 MHz frequencies. Gary K8IZ Washington State Resident Registered Linux User # 312991 |
Gary P. Fiber wrote in message . ..
Gary, I am inclined to think you are correct. The battery only supplies power to the CPU. Not an external memory. The CPU has an EPROM window. So I think the radio programming is in ROM. And the limited RAM inside the CPU only holds user programmed frequenies. But I could be wrong. It could hold calibration factors or frequency range information for the PLL. Have you tried this on an IC-735 yourself? P.S. The current drain from the CPU must be very low. The 13 year old battery has a voltage of 2.946 volts under load. Its still going strong. On Wed, 28 Jan 2004 17:21:37 -0500, Nitespark wrote: Derek Toeppen wrote: I have a 13 year old IC735. In the manual it says the lithium battery is good for 5 years. After that it should be monitored closely and replaced as needed. The battery has not been changed in the 13 years. So I am thinking its time to replace it. The manual says it is used for the memory that holds the frequencies and setup. And that it should be replaced by Icom. At this time the radio remembers all the setups and frequenies when powered down. So it appears to still be functioning. What happens if I remove the battery with the power off? Do I loss just the setup? Or do I loss the operating system for the radio? I am going to make an assumption that this is the same or similar setup that is used in the IC-745. I had one several years ago and changed the battery and you really need to be careful. You should get a 3 volt source and tack solder it across the points on the circuit board where the existing lithium battery is connected. You may want to do the tack soldering on the same circuit trace but away from where the lithium cell is soldered in. Remove the lithium cell and replace it with the new one. Then remove the tack solder leads and you should be set for another 10 years or so. If you remove the lithium cell without the backup, you will lose the radio programming and it must be sent back to Icom for reprogramming. If you do blow the programming, you need not send the entire radio (at least on the IC745). As I recall, the memory board is socketed into the main board so all you need send back is the memory board. I went to Radio Shack and purchased a two AA cell battery back, soldered the leads onto that with some fresh AA's and the battery replacement went just fine. It is quite easy to lose the programming though. A good friend of mine, who is a very meticulous technician, lost the programming on his IC745. Perhaps his solder connection wasn't good or he lost the memory voltage for a split second, but he had to send the memory board back to Icom. If your radio is 13 years old and the memory is on the same battery, I would definitely make arrangements to replace that battery. Andy WD4KDN NO The 735 battery only retains the programmed memories the operator programmed it is not like the IC-745, 751, 751A, 76,1 R71A, 271A / H, 471A / H, 1271A , M700, M700TY where if the battery expires the frequency set up for those transceivers goes away. If the IC-735 battery dies all your programmed memory channels with revert back to 28 MHz frequencies. Gary K8IZ Washington State Resident Registered Linux User # 312991 |
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