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TS22A problems after battery replacement
#635252 02/10/20 05:06 PM
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I should start by saying I am a soldering wizard. I have a TS22A manufactured by Harris. The main board in the body of the unit is date stamped in 1995. The board in the earpiece capsule is dated 1996. Upon finding my old unit in the closet, I found that both the 9 V battery and 3 V battery were toast. This is the version that only has one internal lithium cell on the main board. After acquiring a new cell and spot welding new nickel connections on to the 3V battery, I installed it along with a new 9 V battery. Following the replacement, I found that the loudspeaker would only pop when pressing it’s button, where it used to produce three different volume levels of hum when testing while disconnected from a phone line.

On further investigation I found that one of the chips on a daughter board in the earpiece capsule had it’s top sanded off to obscure its identity, and there was a paper label with the letter R attached to it. I know that some Harris TS22* units had a data lockout chip/processor that would seize up when the 3V battery died. I’m not sure if this is one of those units or not. I will be posting pictures of this chip soon. Can anyone here help me identify the chip, or tell me why these symptoms may be occurring? I know some companies offer a $65 service for repair of these units, but if I can get the offending chip (if it is the problem) and replace it myself, I would save a not insignificant amount of money. If anyone would be willing to help me I would be eternally grateful! I’ve had this unit since high school and would love to get it working.

Thank you in advance!
Garbleduser

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Re: TS22A problems after battery replacement
Garbleduser #635262 02/10/20 08:30 PM
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The attachment manager for this forum seems to be giving me issues uploading a picture. Here is a link to the picture daughterboard with the chip in question. https://www.dropbox.com/s/nzxu9u0yb32y9cg/IMG_0391.jpg?dl=0

Upon looking closer I noticed that the model number which is stamped into the plastic is TS22A.4, just in case it makes a difference. If anyone has any other ideas for what I should check, please let me know!

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Re: TS22A problems after battery replacement
Garbleduser #635301 02/12/20 04:47 PM
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I’ve done a lot more diagnostics on this unit since my last post. I have corrected all of the issues the unit had except for one. The loudspeaker will not activate. It just pops at the same volume when the button is pressed without going through its three levels of amplification. This is with two new batteries installed. Is anyone here familiar with the specific issue on the Harris TS22A?

Thanks in advance!
-Garbleduser

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Re: TS22A problems after battery replacement
Garbleduser #635318 02/13/20 05:39 PM
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Does anyone have circuit schematics for the Harris TS22A?

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Re: TS22A problems after battery replacement
Garbleduser #635320 02/13/20 07:06 PM
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Unfortunately service information and schematics for much of the equipment in this industry is a closely guarded secret. Why? I don't know, especially for something like this that was discontinued many years ago.

If the information was in demand somebody would have reverse engineered it, but, sorry to say the TS22 isn't in that category.

-Hal


CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Re: TS22A problems after battery replacement
hbiss #635324 02/13/20 08:05 PM
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Thank you so much for your reply! I’ve been removing most of the conformal coating from this unit. I’m hoping to get some good pictures to assist in making a complete parts list for the main board. eventually I’ll do the secondary board, which fortunately has very little conformal coating. Some of the components have been a pain in the keister to identify. It was quite time intensive To identify the PTC resettable fuse located under the 9 V battery holder.

If anyone would be willing to compare component values of items on the main board, I think we could find out a lot. The yellow capacitor located at C1 for example has markings on it that don’t seem to correlate with anything I search for. In terms of all the daughterboards on the secondary board in the earpiece capsule, does anyone here have any information on what the individual boards do? I would love to compare pictures to help identify what is on the sanded off chip! In terms of the daughterboards, what I really want to identify is what controls the speakerphone.

As I said in a previous post, the only thing that happens when the speakerphone button is pressed is a pop, each time at the same volume. When the device was in perfect condition, the speaker would amplify three different levels of dialtone or hum when pressed. (Now it just sounds depressed…) If someone has any idea what the cause of this could be, please let me know. Please assist me in tracking this issue down, so we can provide good information to anyone else in the community that our discoveries may help!

Thanks in advance!
-Garbleduser

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Re: TS22A problems after battery replacement
Garbleduser #635426 02/16/20 02:05 PM
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Dont know if this would work but if you had another buttset you could clip on to the speaker leads and see what you get. Might eliminate the speaker as part of the equation.

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Re: TS22A problems after battery replacement
gelehu #635533 02/20/20 05:59 PM
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The speaker shows the correct impedance. Unfortunately the actual speaker mechanism is not the issue. I wouldn’t be surprised if there is a low power voltage regulator chip that Has succumb to age. More exploratory surgery is required.

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