Batboard

AdrianH

The original poster has not been on since the 24th June 2018 so this may be a dead post.

AdrianH

No it did not work for me, but lets say I have a work around I have used, I lost all the functions I had and ended up with a very basic test set. So I did a lot of digging reading posts and a lot of reading and programming the RTC chip, I in fact even managed to build a programmer just for the RTC c...

AdrianH

The DS1286 is the type of RTC originally fitted to a Com120B that basically is just a DS1284 with a pin bent out of the way and a crystal and battery soldered to pins of the Chip then the whole lot potted and a cover on the top. What ever you do follow the instructions within the post regards making...

AdrianH

It would be very difficult to say but at 4.6 Volts some circuits may not kick in, but why has it dropped? It could be a faulty cap going resistive and taking some current/ something else gone faulty, or it could just be an adjustment that is required. The Tants where one for going I believe and the ...

AdrianH

It may be possible to remove the RTC and read it therefore you can save the RTC for the future. It is a bit like playing Russian Roulette, for some it works for some it means loosing everything as removing the chip can trigger a total loss. I used an Eprom programmer to read and program another RTC ...

AdrianH

Hello Pavell I know that I have had the keyboard processor replaced and that has cured an issue for me but I was getting a message reporting "Restoring calibration to front panel" There are Wowbagger posts that says the calibration details are kept in two places one is on the digital card ...

AdrianH

Well I've heard there was a secret chord That David played and it pleased the Lord But you don't really care for music, do you? Well it goes like this: The fourth, the fifth, the minor fall and the major lift The baffled king composing Hallelujah It was the 300 Volt caps one had broken it's solder j...

AdrianH

OK just an update. The power supply still fails on mains, but when I run up on battery the unit initializes and passes self test. The boss at work made a comment about that was why the set was retired from service. Strange it was working before I looked for the not charging problem, so either I have...

AdrianH

OK I need some guidance from anyone that knows, New LT1070CT chip came today so all fitted back together, I hope I have not taken anything else out but on powering up the test set it gets part way through initialization and then shuts down. I am hoping that as I have removed some shorted components ...

AdrianH

Just an update, took the power supply out again, found an area on the board with some scorch marks, tested a few components and found a 30 Volt Zener dead short, it was in series with a standard style diode and used with T2 transformer and a LT1070CT switcher chip. So both diodes have been replaced ...

AdrianH

We have helped each other and I was glad to assist.

The main worry is the gamble it will always work, for me it failed, you managed to keep and read them safely.

Adrian

AdrianH

So as the Dallas RTC the DS1286 has been out of production for some years and there are doubts about the age of so called new ones. I decided as well as getting a two DS1286's to buy two DS1284 chips basically what is in the 1286 and to add my own crystal and battery. So I did these. One has a CR122...

AdrianH

Well I have had a look and I am none the wiser, well perhaps I am. The PSU has been repaired in the past and seems to have replacement Electrolitics in it and a few replacement Tant's where the power connector is to the rest of the unit. I found it very difficult to see markings on some of the compo...

AdrianH

Hi Jim;

the battery is a new one I bought very recently as I knew the original was dead.

I will take the thing apart and look later.

Adrian

AdrianH

Thank you Carl I will have a look at mine and see if I can follow the line you mention.

Although I have to ask is the oven there if no option 2?, think I just have the standard 10 MHz, but it will give me something to look at.

Adrian

AdrianH

If anyone recognises the fault I would be grateful. The unit runs OK on Mains, will work OK from the internal battery when charged externally, and will power from external DC. Just will not charge the internal battery. So if anyone know the circuit enough to point me in the correct direction, not su...

AdrianH

Hello John

Can you tell me if you have anything to program the device with, out side of the IFR as a few bits need to be set. It may be possible to 'poke' some settings into the RTC in the IFR using serial but I have not discovered how to yet.

Adrian

AdrianH

http://www.tamarisktechnicals.com/images/Com120B/Com120B_2.jpg http://www.tamarisktechnicals.com/images/Com120B/Com120B_3.jpg These are the sort of caps that go the small metal can electrolitics, there is a range of sizes and also there are some non polarized on boards as well generally the ones wi...

AdrianH

Unfortunately on the DS1286 Pin 25 is not present, the device is basically the DS1284 with several pins bent up, such as pins 2 and 3 for a crystal and Pins 21 gnd and 25 bat + are not present as these are used for the battery. Another pin which on the 1284 that is not brought out is Pin 24 /RCLR as...

AdrianH

Hi Pavel; It could be possible the problems was on my read, it is always possible. I took another reading of the new RTC last night and have that saved with 2 hours plus run time, that is now saved on file. Yes I could try the numbers from that post, it could be a start I guess. My own sets previous...

AdrianH

Well one of the fixes was not to be! I left the test set with no internal battery and no mains connected for 24 hours and on re-applying power and starting up I got the restoring cals to front panel message. So looks like the board will be getting sent off for a replacement processor after all. Oh w...

AdrianH

Long post sorry, maybe of interest to some! I believe it went after de-soldering, I did read the chip and found the /esoc bit was high as I found in the new chips I bought. The original plan was to de-solder, read and then replace the original chip, but when I read it and found erroneous times in th...

AdrianH

Hello David; I can verify the same problem when trying to set the ifbw0 ifbw1 etc. I was hoping to get my RTC out, put a socket in and then refit, but either the heat of un soldering or what have you has meant I also lost the battery in the RTC. I had been getting the odd error that I had put down t...

AdrianH

Continuing to work on my 120B and to figure things out. As like many others the main concern in the RTC, so a while ago I ordered a couple of RTC's from Ebay and was wondering if one would really consider these being made in 2016? http://www.tamarisktechnicals.com/images/Com120B/Com120B_14RTC.jpg I ...

AdrianH

Hello David; I can only suggest a couple of things for you. If you still have options available under your /setup/version/ screen then there is a good chance you still have the serial number in there. But must admit I am unsure of the differences between the 120A and the 120B as to capabilities. I h...

AdrianH

I realised, (eventually) that this is an old thread, but it may help someone. I always work out in my head that every 10 dB down in signal reduces the level by 10. So 10 watts in, with 10 dB loss, I would end up with 1 Watt. But, 20 dB loss is not a reduction by 20 it is a reduction of 10 x 10 or 10...

AdrianH

OK second time around, I could not edit my previous post but wanted to change it in case others that followed possibly went down the wrong path with my ramblings. So that post has been deleted and I have added this. I thought I had found the EEProm on the front panel that was causing the 'Restoring ...

AdrianH

I was sure I posted again after asking about adjuster A and B? I found that A adjusts the +10.5 and -10.5 Volt rails, so assume B could be similar poss for the 5 Volt rails but decided against adjusting as they were OK. Can any one suggest where the eeprom is that goes faulty around the front panel,...

AdrianH

Since I posted the above in the morning and now it is late evening for me, I decided to have a play with the pot one can see, very carefully. It did modify the +10.5 and -10.5 Volt ranges, it seemed to be a balancing act as one moved so did the other, as the tolerances are different between the rail...

AdrianH

Just in case some users of the 120 series do not have this: https://ats.aeroflex.com/support/technical-support/product-support-documents/com120c-software/equipment-setup-utility-for-the-com-120b-to-establish-common-test-setups The above is a link through the Cobham website to a software utility that...

AdrianH

@ronbot This is probably to late for you now, but as I am getting things to work, thought I would try to help out. I put in a signal from a DDS generator at 1kHz sin going up to 20 kHz, checked it was reasonably flat on my R&S kit then plugged it into the IFR Com120B and also found it flat acros...

AdrianH

A bit slow progress tonight, started to replace caps starting with the 100uF 6 Volts, then the 47uF 16 Volts, going smaller as I go. Well that was the plan! Then it changed. I did the 5 x 100 uF's, then 1 x 47 uF that was leaking and the 3 x 1 uF that were also leaking. Had a good clean of the board...

AdrianH

I am in the Blackburn area. North West. I got it from work with the test set as mentioned in one of my posts the company I work for wrote the MPT 1327 software. I could scan it at work, but a bit like taking the Mick. I find the manual a bit awkward as there is no descriptions, multipart drawings an...

AdrianH

Hi; I have replacement caps on order, some flux off, some solder paste and I will have to dig out my anti-static work mat. The main thing that is worrying, is I do not know how long the RTC will last and could I make it worse? I found an old device with a serial port so have taken the readings as su...

AdrianH

Hello ablitz Do not think I am into grinding down chips just yet. I have had the unit powered up for 5 hours now, I reseated all the cards straightened the side chassis, not bent that much just a bit buckled and when I first powered it on this morning it passed self test. :) As times went on the sig...

AdrianH

Hello to the group new member on here, I have been reading these posts about IFR and have found them of great help. I thank you all for providing the information you have. I am now the owner of a faulty Com120B, , when I say faulty I mean that sometimes the unit will power sometimes not, sometimes I...

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