Batboard

The clock on my HT1250 is loosing about 20 minutes a day. Any ideas on this? Is there an internal battery that keeps the time? The radio always has the battery attached and this radio is used for about 12 hours daily.
Thanks in adance

KB1DRL wrote:The clock on my HT1250 is loosing about 20 minutes a day. Any ideas on this? Is there an internal battery that keeps the time? The radio always has the battery attached and this radio is used for about 12 hours daily.
Thanks in adance

Interesting. I had issues with my clock in the past, like it resetting periodically, especially if the battery was removed from the radio for more than a couple hours. Other issues included the clock resetting after a reprogramming. I think there was another issue as well that I can't recall, but after programming it with a newer CPS and having the firmware upgraded (I noticed the clock problems disappeared after R05.08.03)

What firmware is in your radio? That may be an issue

-Josh

Thanks for the help Josh. My firmware version is 05.09.02 and it was sent to the depot less than a year ago to have the "blue gasket upgrade" done. I have CPS 06.01.00. I have never had any problems with the clock until last week.

i've had quite the contrary issue w/ the HT1250....we've got 50 of them in service, all w/ "7AN" model numbers, and no other issues that will not keep the clock even remotely close. We just ignore it.

i seem to remember something here on the bat board about an internal battery that runs the clock. Its similar to a cmos battery in a computer. My1250 is loosing time, and its only firmware 2. Im going to crack it open one of these days.

Funny, I was going to post something today about the same issue.
hmmmm....

I believe also from past experience that the firmware version makes a difference, newer firmware I thought corrected a problem with the clock...may just be my bad memory, but I seem to remember something on this before, may be worth doing a search to find it..

I have the SRN and it's not that long. If anyone wants me to post it I will, if not, just email me & I'll send it to whoever wants it.

fire4117 wrote:I have the SRN and it's not that long. If anyone wants me to post it I will, if not, just email me & I'll send it to whoever wants it.

please post or email to me.

Thanks

Here's the info.

SRN – 1498A
APC – 749, 008, 004
October 2005
Informational Only

Distribution: Service: MOL: Two Way Portable

From: HT1250LS+/HT1250LS/HT1250 - Subscriber Product Group
Subject: HT1250LS+/HT1250LS/HT1250 - Real Time Clock (RTC) is losing time

Symptoms:
The problem the HT1250LS+/HT1250LS/HT1250/EX600XLS/MTX8250LS portable radios are experiencing is intermittent losses of time to the radio’s RTC on its display. Turning the radio off will intermittently cause the RTC to stop as well. When you turn the radio back on, the RTC starts again. Depending on the length of time the radio was off, you could loose anywhere from a few minutes to several hours.

Potential Problem Radios:
Any Professional Series Portable that has the RTC feature and has firmware version R05.09.06 or older, potentially have this problem. Radio’s shipping from the factory starting with date code 5343 will have the fix implemented into it already.

Cause:
A setting in the radio’s firmware is causing an improper shut down of the microprocessor’s “SYN” line. This is causing the RTC of the microprocessor not to be switched to Vstby quickly enough to sustain the RTC.

Corrective Action:
Updating the radio’s firmware to version R05.09.11 or newer will correct this problems.

Informational Only. No Labor or Warranty Implied or Intended.

Wow when did 05.09.11 come out? last time I checked/ upgraded, 05.09.06 was the new thing... either way, I don't have problems with the clock with 05.09.06

-Josh

There is a small battery for the clock inside the HT1250. This is a "backup" battery for when you remove the radios battery - so the clock doesn't loose its time.

I've never seen a HT1250 have a slow clock OR loosing time becasue of the firmware issue mentioned in the above posts. However, I've replaced the internal battery on two HT1250's that would not keep proper time, which fixed the clock issue.

I posted the battery number about a year or so ago, but can't remember at this moment what the battery number is. However it's just a small watch battery available at any local Radio S4@ck or WallyWorld for a few dollars.

Good luck

UPDATE:

The battery is a 1.5v battery. The numbers are 1S621. It measures 6.75mm by 2.10mm.

If the battery number (/\/\otorola OEM?) doesn't cross reference to anything, then just get a battery with the specs above.

My HT1250s wont change the time when set.