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Author Topic: Finally bit the dust! HTX-202  (Read 6041 times)
VE4KAB
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Posts: 8




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« on: March 02, 2012, 11:20:29 AM »

It's a sad day.  My old faithful "brick" 2M HTX-202 finally gave me the old ER2!!  I've used it faithfully for years and I can truly say I got my $$ out of it.  I can't find much on the net about repairing the ER2.  The unit was working fine, then one night in the shack, HTX-202 on and monitoring a repeater, then it starts making beeping sounds and display reads ER2.  It goes to ER2 the second it's turned on.  Tried reset to cpu, low power, remote antenna, running batteries.  Looks like I'm hooped!  Suggestions.........other than letting it go for parts would be appreciated?  73 Undecided
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WB8VLC
Member

Posts: 120




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« Reply #1 on: March 02, 2012, 01:14:20 PM »

Error 2 is an unlocked PLL, have you tried any other frequencies at the band edges to see if possibly components in the VCO have drifted ?
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VE4KAB
Member

Posts: 8




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« Reply #2 on: March 02, 2012, 02:18:30 PM »

When I turn it on it won't even display frequency or allow me to tune.  Nothing but the ER2 error on the frequency display and a beep every few seconds. No audio.  It's as if the hand held is locked due to that type of error. 
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WB6THE
Member

Posts: 129




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« Reply #3 on: March 02, 2012, 03:41:02 PM »

The ER2 error can be repaired. ER2 means that the internal CMOS
backup battery has died. The battery is a 3.0 Volt button battery
very much like the one in a computer.

Do a Google search on  htx202 er2 error and you'll find
information about the problem.

Unlike the backup battery in a computer, the battery in the HTX-202
has solder tabs. It is not possible to solder to a button battery so
you'll have to find one with the tabs.

Replace the battery and perform the reset procedure and the HTX-202
will run for another 20 years.

Alan
WB6THE
« Last Edit: March 02, 2012, 03:44:53 PM by WB6THE » Logged
KE3WD
Member

Posts: 5689




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« Reply #4 on: March 02, 2012, 03:50:25 PM »

The ER2 error can be repaired. ER2 means that the internal CMOS
backup battery has died. The battery is a 3.0 Volt button battery
very much like the one in a computer.

Do a Google search on  htx202 er2 error and you'll find
information about the problem.

Unlike the backup battery in a computer, the battery in the HTX-202
has solder tabs. It is not possible to solder to a button battery so
you'll have to find one with the tabs.

Replace the battery and perform the reset procedure and the HTX-202
will run for another 20 years.

Alan
WB6THE

Every 202 I've seen with the ERR problem, this was the correct fix. 

73
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WB6THE
Member

Posts: 129




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« Reply #5 on: March 02, 2012, 05:01:45 PM »

Me Again...

The battery is not soldered  to any circuit boards, it is enclosed
in heat shrink or plastic tubing with wires leading out. There is
no available space inside for a battery holder.

A lot of screws to remove from the case to get at the insides
and the battery is on the component side of the digital board.
The digital board is the circuit board behind the keypad/front panel
of the radio and it is underneath an RF shield plate.

I looked through my collection of books and manuals that
I don't know I had and found the HTX-202 Radio Shack service manual
so if you need detailed help let me know.

As for the battery in question the manual says:
Battery, Lithium, 3V, 3.8 x 15mm
A standard computer motherboard battery, CR2032, is 18mm diameter
and would work just fine except those battery cases will not accept solder.
In a real pinch you could *make* it work. I've done that. Do yourself a big
favor and get one with solder tabs! Observe battery polarity.

Alan
WB6THE
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KE4VVF
Member

Posts: 61




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« Reply #6 on: March 03, 2012, 07:57:32 PM »

Yep,
Change out the button battery.  Be sure to wrap it well with a dielectric tape or shrink wrap before closing the radio.  It's a very tight fit inside the HT and it will certainly short out if not covered very well.  After install, reset the radio and it'll be good to go. 

I still use my HTX-202 daily.  It's a little work horse of a radio with great audio Rx and Tx.  I'd have it buried with me except I'm going to will it to my nephew.  It may outlast him too.
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MDNITERDER
Member

Posts: 146




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« Reply #7 on: March 04, 2012, 02:29:09 AM »

Im glad to see people use these radios, I picked up two of them for 25$ at a garage sale Cheesy

 Hope to get my license if all goes well next week.
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VE4KAB
Member

Posts: 8




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« Reply #8 on: March 04, 2012, 06:12:40 AM »

I replaced the lithium battery backup last year after it gave me an ER1 message.  That was fairly easy repair.  Are you suggesting the ER2 code also has to do with the battery backup?  Most info on the ER2 code says to send it to Radio Shack for repair.............sure, I'll get right on that!  I'll take the covers off and see if the battery is shorting or maybe a cold solder joint. 
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KE3WD
Member

Posts: 5689




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« Reply #9 on: March 04, 2012, 05:55:29 PM »

ERR2 has been known to happen when using a larger than stock battery pack that has a higher voltage. 

The cure is to open the radio and find the pcb trace that goes from the battery, up thru the lefthand side of the radio, right past the antenna, to the final. 

Once found, cut the trace at the battery and at at the final side, replace with an insulated wire sufficient to handle the current, and also place an RF choke on that wire, as close to the final as possible.  Cover up with heatshrink to avoid shorts. 

OR -- just obtain the lower voltage battery pack that won't make enough RF to allow it to couple onto the Vcc line. 


73
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VE4KAB
Member

Posts: 8




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« Reply #10 on: March 05, 2012, 10:44:56 AM »

Thanks.  I'll give it a try.
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W8QHV
Member

Posts: 1




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« Reply #11 on: March 13, 2012, 01:58:50 AM »

I own two HTX-202s.  A buddy of mine gave them to me to repair, as he stated that he would never get around to repairing them.  One had a power output final that needed replaced.  That was in the bag, too.  It has a bit of the screen leaking around the edge, but it does not affect the display, yet.  The other I have has a busted screen, but works otherwise.  I LOVE them both.  I have to work on his HTX-404 next, as the sensitivity on it is really lacking right now.  You have to be right on top of a repeater to hear it. 
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N4NYY
Member

Posts: 4776




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« Reply #12 on: March 13, 2012, 08:39:21 AM »

Quote
The ER2 error can be repaired. ER2 means that the internal CMOS
backup battery has died. The battery is a 3.0 Volt button battery
very much like the one in a computer.

Do a Google search on  htx202 er2 error and you'll find
information about the problem.

Unlike the backup battery in a computer, the battery in the HTX-202
has solder tabs. It is not possible to solder to a button battery so
you'll have to find one with the tabs.

Replace the battery and perform the reset procedure and the HTX-202
will run for another 20 years

If that battery is one of this pain-in-the-ass CR2032, then the battery is about $5 at any drug store. But the better news is, that Radio Shack sells a socket for that battery, so you can quickly replace it in the future without soldering. And you can place it pretty much anywhere the length of the wires allow.
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AD4U
Member

Posts: 2167




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« Reply #13 on: March 13, 2012, 10:29:59 AM »

[ And you can place it pretty much anywhere the length of the wires allow.

Yep about 15 years ago the memory battery died in my 22 year old Kenwood 231.  At that time Kenwood wanted $37 for the proper replacement battery. 

I bought the largest 3V button battery I could find.  Yes I soldered wires to it.  It can be done but carefully.  The battery can explode if heated too hot.

Since the big replacement battery would not fit in the original small space where the factory battery resided, I found a blank space back inside the radio.  I wrapped the new battery in electrical tape and ran the wires from the new battery about 5 inches and soldered them where the original battery tabs were soldered.

After 15 years on the new battery, the Kenwood 231 still "remembers" all the stuff I put in the memory channels.

Dick  AD4U
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N4NYY
Member

Posts: 4776




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« Reply #14 on: March 13, 2012, 02:08:06 PM »

Quote
At that time Kenwood wanted $37 for the proper replacement battery.

OMG! LOL
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