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Paulbg
Tinkerer
Username: Paulbg
Post Number: 4
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, November 09, 2011 - 09:17 am: | 
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Is this camera's repair suitable for this forum? It has digital circuitry after all. |
Paulbg
Tinkerer
Username: Paulbg
Post Number: 5
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, November 09, 2011 - 12:54 pm: |
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Problem: logic error from somewhere that gives the EEEE EE code on Tv. Av gives nothing except on f4 but no meter readings just a spurious reading (can be anything 3" 1 or the like) Battery check gives EEEE EE reading and no check light! (battery is fine.) This isn't the usual 'A' multi-exposure/stop-down fault. The body is undamaged and no water damage etc., in fact almost mint. I suspect mechanical sensor failure rather than the IC. Shutter/mirror fires when electromag. is tripped...it's got me this one. Poking about blindly at circuits just gets you nowhere...any thoughts anyone? |
Waynemel
Tinkerer
Username: Waynemel
Post Number: 121
Registered: 08-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, November 09, 2011 - 06:05 pm: |
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Have you got the repair manual? I know that I downloaded it from somewhere. It may give you more troubleshooting answers. |
Paulbg
Tinkerer
Username: Paulbg
Post Number: 7
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 10, 2011 - 03:16 am: |
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Thank-you Waynemel, yes I have. It is very comprehensive but doesn't describe the error handling used.ie. why it would give an EEEE EE error. It appears to be a catchall for many errors...but which? (We're into rocket science here, which is why I love my Feds, Zorkis, Fs and Spotties.) |
Dgmaley
Tinkerer
Username: Dgmaley
Post Number: 17
Registered: 01-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 10, 2011 - 07:01 am: |
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in fact almost mint
Could this problem be the reason the camera is in such good shape? Did it ever actually get sold? I'm with you. The CPU is fine, but suspect a cold solder connection or a microscopic break in a PC board. It would have been taken care of 30 years ago if it were a simple fix. |
Paulbg
Tinkerer
Username: Paulbg
Post Number: 8
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 10, 2011 - 10:04 am: |
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I think you're on the right track Dgmaley, the evidence is usually there if you look carefully. I've studied all the top circuit boards and pressure contacts on the three ribbon circuits...and all is shiny and well. Electromagnets and lower ribbon looks OK untouched. All very clean? Occasional mirror squeal (when tripped)...so not totally new. Cold solder/dirty contact sounds most likely. If it is there are bound to be many out there with the same fault, but it's probably going to need a scope to find it. Or I get lucky? |
Dgmaley
Tinkerer
Username: Dgmaley
Post Number: 18
Registered: 01-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 10, 2011 - 11:16 am: |
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Paul;
Yea, a scope or a digital logic probe. You are not going to just see this one.
I've found cameras like this one. Have a new, 30 year old K1000. It was returned to the dealer with a light leak that couldn't be found. Ended up having a bad spot on the film plane casting and a ton of dark glue to remove.
Do you have access to another A-1 with a mechical problem? Start swapping boards.
Dave.. |
Waynemel
Tinkerer
Username: Waynemel
Post Number: 123
Registered: 08-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 10, 2011 - 12:56 pm: |
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Have you tried this:
Error Mark Display
Six red "E"'s will appear in the finder if you push in the stop-down lever, release it and then return the aperture ring to the "A" mark before taking a picture. This situation could occur, for instance, when checking depth of field in the aperture priority mode.When the error message appears in the viewfinder, shutter button and Film-Advance Lever can be both in-operative. Depressing shutter button partway causes display to show error signal even if display is turned off. Correction is by pushing the multiple exposure lever to the left and throwing the film advance lever.
Note: To view depth of field, you take the lens off 'A' and push in the Stop-Down Lever. Then you un-lock the Stop Down Lever and return the lens to 'A'. |
Paulbg
Tinkerer
Username: Paulbg
Post Number: 9
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 10, 2011 - 02:32 pm: |
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Yes Waynemel, tried that first. The battery check showing EEEE EE and no check light, that's the odd part. Could be the osc IC, aperture sensor...or who knows.I'll keep at it and all suggestions welcome! |
