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Forum: Pentax Film SLR Discussion 07-31-2014, 01:44 AM  
How radioactive are the Super Takumars?
Posted By CRM-114
Replies: 84
Views: 44,860
Awwh come on peeps,

radiation badges are made of what?
(hint, they often called 'film dosimeter')

These are lenses intended for film cameras ;-)
Forum: Pentax Film SLR Discussion 07-31-2011, 04:47 AM  
MZ-50 motor
Posted By CRM-114
Replies: 10
Views: 2,730
Yep, no soldering and very little dismantling - that was the aim ;-)

The reference I posted is the right pinion for the MZ series cameras, the 'modulus' being the important number (for a perfect mesh). Also get he maximum depth (width) as this will make placement less critical.

I did not check your link, but if it's the same pinion as per the attached photo in my post you're good to go.

Read the written description I posted a couple of posts later, it gives clue about what to look out for.

BTW, if you're all thumbs, I would not attempt this, even in the 'simplified mode', you need some experience with pulling things apart - like the discipline to identify which screw goes where as you dismantle...different lengths and metal and self-tapping for example.

But the limited dismantling does avoid the most cumbersome and tricky parts, also if you are careful, the gearbox should remain in mesh so the mirror/aperture should remain in synch.

The MZ50 and MZ5n I repaired like this are still working, so there is no reason it should not work for you.
Good luck!
Forum: Pentax Film SLR Discussion 07-31-2011, 02:36 AM  
MZ-50 motor
Posted By CRM-114
Replies: 10
Views: 2,730
Yes, the cost of parts is a problem.

For this reason I tried this:
Forum: Pentax Film SLR Discussion 04-03-2011, 04:47 AM  
How radioactive are the Super Takumars?
Posted By CRM-114
Replies: 84
Views: 44,860
Tsk, tsk

radioactive lens?

dosimeters are made of what exactly?

What is in the back of every operational 35mm camera?

Come on!
Forum: Troubleshooting and Beginner Help 02-15-2011, 01:22 AM  
sf1/sfx reflex lense/mirror is sprung in the up position and wont come down
Posted By CRM-114
Replies: 12
Views: 6,224
Hi there,

I don't know if posting a link to another board is good form on this forum, but I found this:
Pentax SF1 wont advance film - Photo Forum - Photography Forum

It would seem that people are confusing two Pentax types and taring all with the same brush.

The last post tells the real story...Its not the gear, but the spring.
Forum: Pentax Compact Cameras 02-15-2011, 01:12 AM  
Optio S firmware ?
Posted By CRM-114
Replies: 1
Views: 4,890

unfortunately my optio S has just craped out: garbled menu and missing info in the lcd display.

It still takes pictures though, so may be salvageable..I don't know.

I did a bit of net trawling and found people with similar symptoms reloading their camera's firmware, claiming a fix.

Of course this was some years ago, and the net being what it is all links to fwdc110p.bin have disappeared.

Does any one have a copy of fwdc110p.bin I could have ..please.

Forum: Pentax Film SLR Discussion 02-14-2011, 01:18 AM  
MZ5n mirror blocked, service manual?
Posted By CRM-114
Replies: 102
Views: 60,701
OK, got the film back from the minilab.

Everything is fine, took some shots in Av, Program and with flash. All came out fine, so there are no problems with the synch of the mirror or the aperture indexing.

It would appear this is a quick,easy and effective fix for what is arguably the achille's heel of those fine cameras. ;-)
Forum: Pentax Film SLR Discussion 02-11-2011, 08:13 PM  
MZ5n mirror blocked, service manual?
Posted By CRM-114
Replies: 102
Views: 60,701
OK, so having found the replacement gear, the next trick was to install it.

I have once before replaced the whole motor in an MZ5n, and frankly, this was 'intense'. I figured there must be a simpler was. (No slur on the previous guides reproduced here, after all, that's what gave me the impetus to trial this - and it is the 'proper way to do this job).

I also took note of the comments on the cost effectiveness of repairing MZ50 and lesser MZ bodies against the cost of new motors - hence the sourcing of the pinion on its own.

What is to follow is a quick and dirty way of fixing this gear failure.

Technicians and sensitive souls avert your eyes ;)

First remove only the minimum for access, that is the bottom cover, both side covers and the mount cover.

Then unscrew the metal plate at the base, and swing out of the way. I found turning it 'clockwise' and hanging over the lens mount the best position - there is a ribbon connector that prevents total removal, so rather than trying to 'play' with it and break it I just opted for access clearance.

Remove white gear from the base - this will allow a better angle for a screwdriver to loosen one of the gearbox mounting screws.

Loosen the other gearbox mounting screw (near mount release).

You should now have enough slack in the gearbox plate to ease it apart. I restrained it 'open' by jamming a screwdriver in the gap - see photo.

You now have enough clearance to slide the split pinion from the motor shaft.

Insert new pinion with tweezers, making sure you clear the 'green' gear - it may foul the approach and not allow a perpendicular alignment of the pinion, and make it impossible to put on.

Once pinion is located on shaft, remove screwdriver holding gearbox open, this will provide tension to hold everything in place whilst you tighten the gearbox screws - make sure the pinion and grey gear wheel are meshed as you close up the gap - rotate with finger.

As you are closing up the gearbox, slide pinion on motor shaft - optionally, I put a tiny drop of isocyanate glue on the shaft - this is up to you, but be careful.

The rest as they say, is a reverse of earlier process..

Attachment 83346

Attachment 83347

Attachment 83348

I've put a roll of superia in it, and will post results
Forum: Pentax Film SLR Discussion 02-07-2011, 01:51 AM  
MZ5n mirror blocked, service manual?
Posted By CRM-114
Replies: 102
Views: 60,701
this is what I just tried:

First, I have no association with this firm, I just post the reference as I think it will make it easier for others to order the gear.

The fit is firm on the shaft, but I would use some glue, like isocyanate or similar to make sure.

the 3mm width is the max they do, and this is just enough, but still about 0.9 less than the original, so some care in the final placement.

I have not installed it yet, so I don't know the final verdict, but the gear meshes perfectly with the original, so a good sign.
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