Service Manuals, User Guides, Schematic Diagrams or docs for : PENTAX Cameras PENTAX_ME_super PENTAX_ME_super
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PRODUCT No. 23903
SERVICE MANUAL
ENGLISH
Disassembling and assembling procedures are almost the same as 23900 and/or
23901. Therefore, the details of disassembling and assembling procedures are
abbreviated.
Here is explained about special items for 23903.
Disassembly
1. Bottom cover assy. (A400)
CSS 1.7 x 3 x 2
CSS 1.7 x 2
Connector seat (A23)
2. Winding lever assy. (0-C69)
Cover screw (C139-01) left handed 23600K-C135-A
Winding lever nut (C8) left handed 23600K-C134-A-2
Winding lever assy, (0-C69)
Winding lever friction spring (C7-01)
3. Rewinding knob assy. (0-D6), ASA ring assy. (D-D11-01)
Rewinding knob assy. (0-D6)
Nut (D15)
*Washer (D21)
ASA ring assy. (0-D11-01)
*Washer (D2l)
To adjust the torque of click of ASA ring.
4. Top cover assy. (A300)
Top cover retainer screw A (A333) x 2
B (A334)
C (A342) x 2
D (A345)
*Top cover assy. (A300)
*Top cover assy. (A300)
Material of Top cover assy. (A300) is a plastic. But the
surface is made conductive by surface treatment. So that the
electrical conductive does not apply on the back of Top cover
assy. (A300).
5. Unsoldering
1) P.C. board pattern (T100)
2) Relay P.C. board assy. (0-A129)
Before unsoldering, take out Insulation seal (A152)
to prevent melting by soldering iron.
23903 Page 1 of 32
3) f-volume (K101)
4) Hot shoe contact A (N4), Hot shoe contact C (N9)
5) EF switch contact piece (A44)
Before unsoldering, take out ASA volume (R100)
ASA volume retainer screw (A16-01)
CNL-D 1.7 x 2. 5
ASA volume (R100)
6) Connector base plate assy. (0-A21)
6. Self-timer charge lever assy. (0-A118)
Self-timer screw (A122) 231K-H50
Self-timer charge lever assy. (0-A118)
Self-timer collar (A123)
W30
7. Body covering
Body covering, right (A19)
Body covering, left (A20)
After peel off, re-install Self-timer charge lever assy. (0-A118)
8. Front board and Mirror housing complete assy.
At the charged condition.
CNL-D 1.7 x 3 x 2
P.C. board pattern retainer (I1)
W14
Front board retainer screw (A132-01) x 4
9. P.C. board pattern (T100)
T-CNL-E 1.7 x 4
Hot shoe contact piece A (N4)
Insulation collar (N8)
Insulation plate (N13)
T-CNL-E l.7 x 3
Hot shoe contact piece C (N9)
CNL-D 1.4 x 3
LED retainer collar (T212)
23903 Page 2 of 32
*PC board pattern (T100)
LED part in P. C. board pattern (T100) should be taken out straight and
carefully to prevent making scratches on Shutter speed scale indication
plate (M10).
*P.C. board pattern (T100)
It is recommended that P.C. board pattern (T100) is taken out
from Mirror housing under the condition separated from Body
proper (A1). due to difficulty of LED part taken out and/or
installed.
Assembly and Adjustment
1. Cocked indicator assy. (0-C23) Check the spring tenSion.
At the released condition, the spring should have no tension.
If the spring tension is stronger at the charged condition, 2nd curtain
speed will be affected. Accordingly, 1/2000sec will be changed by its
spring tension. (l/2000sec should be not changed by its spring
tension.)
2. Adjustment of Main SW
At the condition of release plate assy. (A500)
goes
up completely, adjust 0.5mm clearance between
the
contact pieces by turning eccentric screw.
Adjust the clearance by eccentric screw in the range shown below to
prevent the side of screw touching the body when the shutter rod pushed
down or up.
If the clearance is wider
than 0.5mm, the shutter
will be stayed open at the
1st exposure when released
by Self-timer or Winder.
3. EF- switch contact piece (A44)
The clearance of A should be within 0.3mm.
Adjust the clearance by bending the part of
B.
23903 Page 3 of 32
4. Bulb off adjustment
Install *the temporary top cover and set the shutter dial Bulb.
Within the range A, 2nd curtain
should be released. Adjust by
eccentric screw.
Confirmation
1) Change the shutter dial 125X. And release the shutter. The shutter
speed should be1/125 sec, not 1/500 or l/l000sec.
2) At the charged condition, release only the shutter block, not push
the shutter button. The shutter speed should be 1/125 sec, not 1/500
or l/l000sec.
*The temporary top cover
5. Dumper lever plate assy. (0-B90)
Adjust the actuating torque by turning Nut (B96).
About 1.5 teeth out from the surface of nut (B96).
The level of actuating torque is depends on the
greatness of mirror bounce.
Confirmation
1) When drop the mirror seat from up-position,
an afterimage of dumper lever plate down and up
can be seen after the mirror seat hitted with
the dumper lever plate.
2) When pushed down the dumper lever plate, and returned slowly, the
dumper lever plate should be returned to the original position
completely by its own tention. If not, check *Friction washer (B94).
*Friction washer (B94)
Material: Calfskin
a. It is prohibited to apply any grease in order to the
material of friction washer (B94) is calfskin.
b. When install, fluffy surface should be faced up.
23903 Page 4 of 32
5. Check of Shutter block (0-E000) by using T-adjuster
It is prohibited to adjust the curtain speed and the shutter speed in
0-E000. If the curtain speed and the shutter speed was out of
tolerance, replace Shutter block (0-E000) to new one.
The curtain speed and the shutter speed must be checked before install
the mirror housing to the body.
*The curtain speed is especially important for 23903 so that l/2000sec.
is adopted.
*The auto-manual speeds are already decided on T100. The auto-manual
speeds which decided on T 100 can not get if the adjustment of timing
switch in 0-E000 was no good.
Insert Connector (23900-I 100) to
Adapter for T-adjuster. Distribute
lead wires as shown left.
To actuate the auto-manual hutter,
install temporary top cover and
set the shutter dial AUTO or M, or
insert 2 mm diameters pin between
C14-01 and C24.
6. Time-sequence of SWg and SWm
It is requested that Adapter for checking the time-sequence of SWg and
SWm should be made by your own side.
Adjusting procedures and the tolerance are the same as 23900.
7. P.C. board pattern (T100)
1) LED part
LED retainer collar (T212)
CNL-D 1.4 x 2.5
Confirm that LED insulation seal (I18) was sealed on the back side of
LED supporting plate.
23903 Page 5 of 32
2) LED positioning
Use P.C. board pattern checker (239 PATTERN CHECKER). Adjust LED
position by sliding the LED supporting plate.
Each LED should be aligned with its figure in the view-finder.
3) As installing Photo-cell part to Cell frame (N1), insert P.C. board to
the connector.
4) Photo-cell part
Hot shoe contact piece C (N9)
T-CNL-E 1.7 x 3
Insulation plate (Nl3)
Insulation collar (N8)
Hot shoe contact piece A (N4)
T-CNL-E 1.7 x 4
8. Front board and Mirror housing
Shutter block charged condition
Mirror housing released condition
*lAThen installed, take care about lead wires.
Front board retainer screw (A132-01) 4pcs.
W14
P. C. board retainer (I1)
CNL-Dl.7 x 3 x 2
After installed, check the functions of shutter.
9. Mechanical back focus.
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