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Kitty
Tinkerer
Username: Kitty
Post Number: 7
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, September 07, 2006 - 09:39 pm: | 
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Um, can someone explain where I can generally find the variable resistor to adjust the sensitivity of a light meter? Matt Denton mentioned it in his site here:
http://www.mattdentonphoto.com/cameras/repairtips.html
but I couldn't find anything similar-looking to the one he pictured in Konica C35.
Anyone also know what the ball bearing of a meter needle looks like? Someone mentioned to me I might be able to fix my Himatic 9's meter if it was just knocked off when I dropped it. |
Rick_oleson
Tinkerer
Username: Rick_oleson
Post Number: 56
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 08, 2006 - 10:17 pm: |
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I can't help you locate the adjust pot in the C35, I'm afraid. Some cameras don't even have an adjust pot in them.
As for the bearing: it's generally sort of like the jewel bearings in a watch, a cup-shaped holder in which the end of the pivot shaft can rest lightly and be free to rotate. In many cases, this is actually a small screw with the point hollowed to an appropriate shape, and if the bearing becomes tight from impact it can be loosened by backing off the screw a tiny fraction of a turn. The screw will be located exactly in the center of one end (whichever end is accessible) of the meter movement housing. |
Wernerjb
Tinkerer
Username: Wernerjb
Post Number: 23
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 09, 2006 - 03:52 am: |
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Hi Kitty, in several K 35s I put in order again there was no such potentiometer. On the other hand there is a variable resistor in otherwise similar cameras (aka clones): in the Cosinas and GAFs, for example, it is glued to the top of the meter's plastic housing (4,7 to 10 kohms).
If there is something wrong with "the sensitivity" of the meter as you say, especially with the K 35, I'd suspect the wiring (try "black wire corrosion" in the this forum's search), bad contacts in the battery box or a defective CdS cell.
In all those meters there are very delicate concentric retracting hairsprings and it is possible, due to the shock on dropping the camera, neighboring windings of these springs interfere with each other. On freeing them up again with a wooden toothpick (no possibly magnetic metal objects here !) you have to be hellishly careful not to mess them up.
I have never seen a mechanically inoperative meter in a Hi-M 7/7s/9 that is with a broken bearing or pivot, W. |
Kitty
Tinkerer
Username: Kitty
Post Number: 8
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, September 11, 2006 - 12:29 am: |
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Rick, Werner, thank you for the replies. I'll take another look at both camera meters and see if I can try my hand at them, perhaps a pro repair guy might be the safer option if they are still salvageable. |
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