Marconi 2022 Frozen on power up - UK Vintage Radio Repair and Restoration Discussion Forum

Wendymott · 26th Apr 2014, 5:37 pm

Hi Guys.
One of (out of 2) Marconi 2022 Signal generators has started mis behaving...on power up, The frequency button is lit...and the REV Output legend is flashing, and No other functions will work, When booting up, it goes through the firmware checks and then goes to the symptom I described.

One silly thing though...if I hold down a button, and power up... Voila works ok.

Any ideas please ??

Not too urgent as number 2 still works ok

Regards
Wendy G8BZY

Dickie · 27th Apr 2014, 9:21 pm

Can you expand on "the REV Output legend is flashing" ? Do you mean the RPP (reverse power protection) has tripped?

Wendymott · 28th Apr 2014, 10:31 am

Hi Richard. Yes you are correct... but even with no RF out connection...Since I posted the request...I have powered on again and it now seems ok....Possibly had a "Friday feeling" day......If it happens again I will repost..
Many thanks
Regards
Wendy G8BZY

Dickie · 28th Apr 2014, 7:04 pm

You can be sure it will happen again, usually when it's most inconvenient..

I was going to say that the manual claims that in that situation the RF level key is still enabled and will reset the RPP trip.
Presumably holding a key down at startup prevents the RPP trip signal getting back to the processor. I would guess you are getting some sort of transient issue at power up that may be down to dried up electrolytics, etc., or maybe a dry joint.

Wendymott · 29th Apr 2014, 10:07 am

Hi Richard.... Good thoughts... many thanks for your comments... I have used it since and seems to be back working, however all the buttons seem " clicky" compared to my other which are smooth, so it seems it will get "seen to" ,soon.
Regards
Wendy G8BZY

Skywave · 29th Apr 2014, 11:00 am

'Clicky' buttons in a Marconi 2022 sig. gen.: could easily be the cause of the described fault, especially as it is intermittent. Although it was a long time ago, I do vaguely recall having your described problem once. The cure was to strip down the key pad and thoroughly clean it with IPA. I've had the same trouble with calculators: same cause; same fix.

Al.

Wendymott · 29th Apr 2014, 9:20 pm

Hi Al.... When I bought it.... from another member.....I found then that it didn't have the same "feel" as my other, I bought it simply to act as a "reserve", but I find it Most useful when doing RF front end re alignment... set one on the LF end and the other at HF, saves all that frequency changing......I will give it attention when I get back from my hols.

Regards
Wendy G8BZY

Dickie · 29th Apr 2014, 9:25 pm

Are you getting confused between technologies? The first 2022s used individual keyswitches using metal dome contacts and actively "clicked". Later developments, eg 2022C,D, used a rubber keymat and conductive rubber pills.

Wendymott · 29th Apr 2014, 10:49 pm

Hmmmmmmmmm ... Yes Richard........One is the plain old 2022 the other is the 2022E.. problem solved.. just hope it behaves now

26th Apr 2014, 5:37 pm	#1
Wendymott Octode Join Date: Jun 2013 Location: Huddersfield, West Yorkshire, UK. Posts: 1,795	Marconi 2022 Frozen on power up Hi Guys. One of (out of 2) Marconi 2022 Signal generators has started mis behaving...on power up, The frequency button is lit...and the REV Output legend is flashing, and No other functions will work, When booting up, it goes through the firmware checks and then goes to the symptom I described. One silly thing though...if I hold down a button, and power up... Voila works ok. Any ideas please ?? Not too urgent as number 2 still works ok Regards Wendy G8BZY

27th Apr 2014, 9:21 pm	#2
Dickie Octode Join Date: Sep 2004 Location: St. Albans, Hertfordshire, UK. Posts: 1,478	Re: Marconi 2022 Frozen on power up Can you expand on "the REV Output legend is flashing" ? Do you mean the RPP (reverse power protection) has tripped? __________________ Regards, Richard, BVWS member

28th Apr 2014, 10:31 am	#3
Wendymott Octode Join Date: Jun 2013 Location: Huddersfield, West Yorkshire, UK. Posts: 1,795	Re: Marconi 2022 Frozen on power up Hi Richard. Yes you are correct... but even with no RF out connection...Since I posted the request...I have powered on again and it now seems ok....Possibly had a "Friday feeling" day......If it happens again I will repost.. Many thanks Regards Wendy G8BZY

28th Apr 2014, 7:04 pm	#4
Dickie Octode Join Date: Sep 2004 Location: St. Albans, Hertfordshire, UK. Posts: 1,478	Re: Marconi 2022 Frozen on power up You can be sure it will happen again, usually when it's most inconvenient.. I was going to say that the manual claims that in that situation the RF level key is still enabled and will reset the RPP trip. Presumably holding a key down at startup prevents the RPP trip signal getting back to the processor. I would guess you are getting some sort of transient issue at power up that may be down to dried up electrolytics, etc., or maybe a dry joint. __________________ Regards, Richard, BVWS member

29th Apr 2014, 10:07 am	#5
Wendymott Octode Join Date: Jun 2013 Location: Huddersfield, West Yorkshire, UK. Posts: 1,795	Re: Marconi 2022 Frozen on power up Hi Richard.... Good thoughts... many thanks for your comments... I have used it since and seems to be back working, however all the buttons seem " clicky" compared to my other which are smooth, so it seems it will get "seen to" ,soon. Regards Wendy G8BZY

29th Apr 2014, 11:00 am	#6
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: Marconi 2022 Frozen on power up 'Clicky' buttons in a Marconi 2022 sig. gen.: could easily be the cause of the described fault, especially as it is intermittent. Although it was a long time ago, I do vaguely recall having your described problem once. The cure was to strip down the key pad and thoroughly clean it with IPA. I've had the same trouble with calculators: same cause; same fix. Al.

29th Apr 2014, 9:20 pm	#7
Wendymott Octode Join Date: Jun 2013 Location: Huddersfield, West Yorkshire, UK. Posts: 1,795	Re: Marconi 2022 Frozen on power up Hi Al.... When I bought it.... from another member.....I found then that it didn't have the same "feel" as my other, I bought it simply to act as a "reserve", but I find it Most useful when doing RF front end re alignment... set one on the LF end and the other at HF, saves all that frequency changing......I will give it attention when I get back from my hols. Regards Wendy G8BZY

29th Apr 2014, 9:25 pm	#8
Dickie Octode Join Date: Sep 2004 Location: St. Albans, Hertfordshire, UK. Posts: 1,478	Re: Marconi 2022 Frozen on power up Are you getting confused between technologies? The first 2022s used individual keyswitches using metal dome contacts and actively "clicked". Later developments, eg 2022C,D, used a rubber keymat and conductive rubber pills. __________________ Regards, Richard, BVWS member

29th Apr 2014, 10:49 pm	#9
Wendymott Octode Join Date: Jun 2013 Location: Huddersfield, West Yorkshire, UK. Posts: 1,795	Re: Marconi 2022 Frozen on power up Hmmmmmmmmm ... Yes Richard........One is the plain old 2022 the other is the 2022E.. problem solved.. just hope it behaves now __________________ Should get out more. Regards Wendy G8BZY