Remote Mic doesn't work on HT1250 without firmware update?

Jammer · Post by **Jammer** » Fri Feb 03, 2006 4:17 pm

So you can't get a public safety mic to work on a HT1250 unless you update the firmware past 02.00? What the hell is that all about!!!??

Seems we're lucky the thing even turns on without an update!

Unless this mic doesn't work..... is it mandatory to update past 2 to get a remote mic working?

Post by **wavetar** » Fri Feb 03, 2006 5:33 pm

I hadn't heard of that particular firmware issue, but really, if you have less than 2.xx.xx firmware, you should get it updated for a multitude of reasons, not just for the public safety mic. The firmware is being updated to this very day...it's no surprise 7-year old firmware would have major bugs.

Todd

K8TEK · Post by **K8TEK** » Fri Feb 03, 2006 5:43 pm

I have never used a radio with that old of firmware... Do regular speaker mics work on it? If they do your mic has issues.

Jammer · Post by **Jammer** » Fri Feb 03, 2006 6:52 pm

This is the only speaker mic I've tried... the only reason I mention the firmware thing is while rooting around in CPS I noticed on the Accessory Microphone Gain help page it mentions This feature is NOT available in portables with firmware releases before R02.00. I don't know if they mean just the Acc Mic gain control is unavailable or that the accessory mic functionality is unavailable. At any rate, when connected there is audio from the mic but transmit will not key up the radio.

Al · Post by Al » Fri Feb 03, 2006 7:35 pm

Remote speaker mic functionality is pretty basic. It's pretty hard to believe that no matter how old your firmware is that RSM functionality isn't present. I'd sooner believe that you have a faulty RSM.

HLA · Post by **HLA** » Sat Feb 04, 2006 1:38 am

when you put the mic on your radio what is or isn't the radio doing? you don't have to change any settings to make the mic work, just trun the radion off, put the mic on and turn it back on. i'm more to believe the mic is bad too.

Jammer · Post by **Jammer** » Sat Feb 04, 2006 2:54 am

OK, I went and got my meter to check this out. Using the pinout from Batlabs it appears that pad 5 is the PTT. So, looking at pin 7 & 5, when I key up the mic pin 5 goes low, or shorts to pin 7 GND. So the mic switch is working OK. Now I continue looking at the pinout and notice pin 4 is external MIC, but that is just for audio. Pin 5 is OPT SEL2 which goes to the PTT on the test rig, and this pin also shorts to GND when keyed so it must be the PTT pad. Pin 6 is OPT SEL 1 which heads to OPT SEL INT/EXT on the rig so I gather from that that that pad goes HI or LOW depending on INT/EXT. Currently pad 6 is at 3.3v, and the radio doesn't key on the ext mic. I was thinking that if EXT was set in the software pad 6 should go HI, and that pad 5 should then go HI too. Without taking the mic apart, I was also considering that when on EXT, pad 6 goes logic HI and when connected to the MIC pin 6 supplies pin 5 on the mic with 3.3v which then goes low when the mic is keyed. Question is for those techs out there: does pad 6 supply the logic to pin 5 through the mic in order that that logic goes low on keying? When tested pin 6 does not short to pin 5 on the mic keyed or unkeyed. Since 1,2 are speaker +/- and pin 4 is audio, that leaves 5,6,7 on the mic. 5 is PTT, 7 is GND and 6 is logic HI. Makes sense that pin 6 should supply pin 5 with logic to gnd to pin 7 when keyed. So in that case, pin 6 should be shorted to 5 at all times should it not? If INT was selected then pin 6 should go low and not supply pin 5 with logic and therefore not key the radio. All that makes sense to me, but I need someone else out there to test their pins on their 9054A safety mic to ensure they get the same readings as I do. Then I should know if the mic is bad or not. I don't feel like trying to short pin 6 to gnd on the radio to see if it keys

Anyone? Thanx

Jammer · Post by **Jammer** » Sat Feb 04, 2006 3:27 am

actually as I look at it, if pin 5 is PTT and it goes low when I key, the pad #5 should be logic hi on the radio side and short to ground when I key. So pin 6 should not supply pin 5 through the mic, PAD 5 on the radio should be logic hi and short to gnd when keyed. So PAD 5 on the radio should be hi then correct?

Jammer · Post by **Jammer** » Sun Feb 05, 2006 4:50 pm

can anyone else check the voltage on pad 5 on the radio and tell me if they get 0 or 3.3? My thinking is somethingin the firmware won't set that pad HI unless I update higher than 2.0.0

Someone pleez check their voltage on pad 5

And also advise if they have a working RSM on that radio?

Thanx

Post by **wavetar** » Sun Feb 05, 2006 8:20 pm

I can tell you for a fact the remote speaker mic works even with firmware version 1.00.00...as that's what our demo radios were back in 97/98...and the remote speaker/mics worked fine.

Todd

K8TEK · Post by **K8TEK** » Mon Feb 06, 2006 8:33 am

It may not be the mic... One of the traces on the flex may have been damaged.

Jammer · Post by **Jammer** » Tue Feb 07, 2006 4:18 pm

I called Mot yesterday to ask how much for an update, the guy asked why I wanted the update and when I told him he said he "believed" that was correct. He wasn't actually a tech at the depot so I don't know what the story really is.

I will get the firmware updated ASAP though and post the results.

Anyone measure the voltage on pad 5 on the radio?

Jammer · Post by **Jammer** » Tue Feb 07, 2006 4:23 pm

There's nothing in CPS that disables the external mic is there? I mean everything's been tried, like VOX etc.

I figure since audio was at the speaker it should key as well.

Before taking the thing apart I'm gonna get it updated. I don't want the cable nightmare if I can avoid it.

Post by **wavetar** » Wed Feb 08, 2006 10:21 am

I measure both pins 5 & 6 to be 3.30Volts, with no speaker/mic attached. Pin 6 goes low when the speaker/mic is attached, and pin 5 goes low when the speaker/mic PTT is pressed. The radio will not key unless both pins are low.

Todd

Jammer · Post by **Jammer** » Wed Feb 08, 2006 6:08 pm

thanks for testing Todd. Motorola service just emailed me back and said firmware wasn't an issue with the mic keying. With that I tried to measure impedance from pad 5 to any other contact and get nothing. All other pads show some value to gnd but pad 5 doesn't.

So I'm in ribbon cable hell I guess as someone else put it

Anyone have a ballpark on replacing the comport ribbon? I'm actually trying to remove the connector at the PCB side and trying to reseat it but I can't see how to separate the lock at the connector. I tried a little pressure but it doesn't just slide back to unlock the ribbon and I don't wanna break anything...

I guess this happened when I recased... though I was supremely carefull during case replacement I'm sure there's a hairline fracture somewhere. I guess I could just keep scratching and testing and jump the gap, but I'd rather not "rig" the radio like that.

Jammer · Post by **Jammer** » Sat Feb 11, 2006 11:44 am

yah... it was a fractured ribbon. New ribbon, works fine.

As a side note, I had firmware R01.00.01 in this thing and the newest R05.09.13 downloaded 2 days ago was able to flash straight up with no problems.

Man do I feel better now. Thanx everybody