D_V_D_27
Yuriy
Malfunctions of a brake latch and failure of shutter speeds "B". Malfunctions of a brake latch (23) Pic.8,11,12,13 and failure of shutter speeds "B" have close interrelation. The endurance "B" (manual) may have any size and is equal to time of pushing the trigger button (39). At all automatic shutter speeds the brake latch (23) releases the second curtains with the help of the lever of an exposition 38. At shutter speeds "B" the lever of an exposition does not any influence on a brake latch (23). The brake latch (23) goes upwards and downwards because of action of 2 springs top (24) Pic.11,12 and low (34) Pic.13 While pressing the trigger button (39) lower spring (34) moves down and detains the second curtains. Shutter is open, the personnel window is completely covered. Having lowered the trigger button (39), the lower spring is released (34) which squeezes out a brake latch (23) and releases the second curtains. In other words at speeds "B" braking knuckle (33) Pic.11,12 should get in dredging of a latch and delay here, otherwise it is necessary to take out a brake latch and to cut a core a little. There is one more reason of failure "B". The finger of the lever 38 of exposition operates on a brake latch (23) at all speeds, except for "B". This problem appears in inexact glueing of the shutters. It is very difficult to re-stick shutters and not every amateur photographer is able to do this, it is possible 38 Pic.12 to make the finger of the lever of an exposition little bit more thin from lateral aspect. For this purpose it is necessary to take off the lever of an exposition 38 and to cut a finger Pic.12 a little with a needle file.
Pic.8
Pic.11
Pic.13
Pic.12
Pic.16
While pressing the trigger button smoothly shutter speeds "B" slips.
1. The brake latch 23 is lifted too highly if to compare with a brake cam 33.
1а. take a brake latch 23 and truncate a core.
2. The brake latch 23 has become soiled or covered by corrosion and has lost mobility (on a vertical)
2а. take a brake latch 23, grind its core and grease with watch oil.
3. The spring 24 of a brake latch 23 has come off.
3а. Before establishing the come off spring 24 back, it is necessary to correct its form, having prevented repeated coming off.
Shutter speed ''B" works as 1/20 s.
1. Long operation or wrong assembly of the shutter. The result is the increasing of course of the lever speeds 38, and the lever in the end of a course touches a brake latch 23 and allocates it.
1a. At an insignificant contact it is enough to file a finger 38. in a place of a contact with a brake latch 23. If the lever contacts a brake latch 23 strongly, it is necessary to disassemble shutter for elimination of malfunction.
Shutter speed ''B". Shutter is left opened, but on other speeds it works normally.
1. The brake latch 23 too is low located if to compare with a brake cam 33.
1а. unbend a brake latch 23 to top.
2. The brake latch 23 shakes on a core.
2а. strengthen a brake latch 23, having unriveted a core in a junction with a latch.
3. The flat spring 34 has become weak or unscrewed on the part of the low cover.
3а. hold on screws that fix the flat spring 34, and if it will not help, take off and strengthen a flat spring 34.
Speeds can not be installed.
1. The screw 46 that fixes speeds has been unscrewed.
1a. To screw 46 up till the stop the screw.
Shutter is not started up to the end , the head of speeds is not established in all positions.
1. The brake latch 23 has skipped through an stop 45.
1a. To return a brake latch 23 back on a place.
Shutter works on all speeds as on speed ''B".
1. The finger 44 of the lever of speeds 38 has dropped out.
1a. To find a dropped out finger 44 and rivet it to the lever of speeds 38.
Shutter doesn't work on speeds 1/20, 1/30, 1/40, 1/60 s, and on short speeds works.
1. The greasing has become soiled, thickened and dried up.
1a. Make cleaning and greasing of rubed details of the shutter.
Curtains of the shutter are left in the started mode. Shutter is not going down.
1. The most probable reason of malfunction is hits of the bits of the film in cones of the shutter.
1a. Take off the body of the camera and remove from the shutter bits of the film in all accessible places.
The film flares by the exstraneous light. The flare is limited by the size of frame of the camera.
1. The tape of the shutter has got stuck and between curtains the crack was formed.
1а. To untangle tapes it is necessary to take off the case of the camera and lower protecting from light shield.
2. One of tapes has broken or stretched, and between curtains the crack was formed.
2а. To glue torn off tape or to re-stick stretched one.
3. Curtains have anguishes or cracks and miss light.
3а. Small apertures in curtains can be stuck or painted over by black varnish. If curtains were wore out, it is necessary to replace them.
Non-uniform exhibiting of the staff at endurances 1/250-1/500 s.
1. As a result of a non-uniform tension of curtains during operation of shutter (long 2a Pic.16) curtains has time to catch up the first (short 1a Pic.16).
1a. Reduce a tension of the second curtains or to strengthen a tension of the first.
Unfortunately, the format of this forum complicates to place the information qualitatively. Please look the full version of this article on the address:
Pic.8
While pressing the trigger button smoothly shutter speeds "B" slips.
1. The brake latch 23 is lifted too highly if to compare with a brake cam 33.
1а. take a brake latch 23 and truncate a core.
2. The brake latch 23 has become soiled or covered by corrosion and has lost mobility (on a vertical)
2а. take a brake latch 23, grind its core and grease with watch oil.
3. The spring 24 of a brake latch 23 has come off.
3а. Before establishing the come off spring 24 back, it is necessary to correct its form, having prevented repeated coming off.
Shutter speed ''B" works as 1/20 s.
1. Long operation or wrong assembly of the shutter. The result is the increasing of course of the lever speeds 38, and the lever in the end of a course touches a brake latch 23 and allocates it.
1a. At an insignificant contact it is enough to file a finger 38. in a place of a contact with a brake latch 23. If the lever contacts a brake latch 23 strongly, it is necessary to disassemble shutter for elimination of malfunction.
Shutter speed ''B". Shutter is left opened, but on other speeds it works normally.
1. The brake latch 23 too is low located if to compare with a brake cam 33.
1а. unbend a brake latch 23 to top.
2. The brake latch 23 shakes on a core.
2а. strengthen a brake latch 23, having unriveted a core in a junction with a latch.
3. The flat spring 34 has become weak or unscrewed on the part of the low cover.
3а. hold on screws that fix the flat spring 34, and if it will not help, take off and strengthen a flat spring 34.
Speeds can not be installed.
1. The screw 46 that fixes speeds has been unscrewed.
1a. To screw 46 up till the stop the screw.
Shutter is not started up to the end , the head of speeds is not established in all positions.
1. The brake latch 23 has skipped through an stop 45.
1a. To return a brake latch 23 back on a place.
Shutter works on all speeds as on speed ''B".
1. The finger 44 of the lever of speeds 38 has dropped out.
1a. To find a dropped out finger 44 and rivet it to the lever of speeds 38.
Shutter doesn't work on speeds 1/20, 1/30, 1/40, 1/60 s, and on short speeds works.
1. The greasing has become soiled, thickened and dried up.
1a. Make cleaning and greasing of rubed details of the shutter.
Curtains of the shutter are left in the started mode. Shutter is not going down.
1. The most probable reason of malfunction is hits of the bits of the film in cones of the shutter.
1a. Take off the body of the camera and remove from the shutter bits of the film in all accessible places.
The film flares by the exstraneous light. The flare is limited by the size of frame of the camera.
1. The tape of the shutter has got stuck and between curtains the crack was formed.
1а. To untangle tapes it is necessary to take off the case of the camera and lower protecting from light shield.
2. One of tapes has broken or stretched, and between curtains the crack was formed.
2а. To glue torn off tape or to re-stick stretched one.
3. Curtains have anguishes or cracks and miss light.
3а. Small apertures in curtains can be stuck or painted over by black varnish. If curtains were wore out, it is necessary to replace them.
Non-uniform exhibiting of the staff at endurances 1/250-1/500 s.
1. As a result of a non-uniform tension of curtains during operation of shutter (long 2a Pic.16) curtains has time to catch up the first (short 1a Pic.16).
1a. Reduce a tension of the second curtains or to strengthen a tension of the first.
Unfortunately, the format of this forum complicates to place the information qualitatively. Please look the full version of this article on the address:
Last edited:
Stu W
Well-known
Thank you!