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MAMMOMAT 300/1000/3000/3000 Nova
SP
Service
Replacements of Parts
Compression Mechanism and Potentiometer (R863)
© Siemens AG 2003
The reproduction, transmission or
use of this document or its contents
is not permitted without express
written authority. Offenders will be
liable for damages. All rights,
including rights created by patent
grant or registration of a utility
model _or_ design,_are_ reserved.
English
Print No.: SPB7-230.841.03.02.02 Doc. Gen. Date: 04.04
Replaces: SPB7-230.841.03.01.02 (66 47 015)
Page 2
0 - 2 Revision
Chapter Page Revision
All All 02
Document revision level
The document corresponds to the version/revision level effective at the time of system delivery. Revisions to hardcopy documentation are not automatically distributed.
Please contact your local Siemens office to order current revision levels.
Disclaimer
The installation and service of equipment described herein is to be performed by qualified personnel
who are employed by Siemens or one of its affiliates or who are otherwise authorized by Siemens or
one of its affiliates to provide such services.
Assemblers and other persons who are not employed by or otherwise directly affiliated with or authorized by Siemens or one of its affiliates are directed to contact one of the local offices of Siemens or
one of its affiliates before attempting installation or service procedures.
M300/1000/3000/3000 Nova SPB7-230.841.03 Page 2 of 4 Siemens AG
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Contents 0 - 3
1 _______Prerequisites __________________________________________________ 1 - 1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 1
Components concerned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 1
Tools required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 1
Documents required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 1
Parts included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 2
Time required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 2
2 _______Procedure - Compression mechanism _____________________________ 2 - 1
Remove the covers from compression unit . . . . . . . . . . . . . . . . . . . . . . . 2 - 1
Replace the compression mechanism . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 2
Test the compression function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 5
3 _______Procedure - Potentiometer R863 __________________________________ 3 - 1
Exchange of Potentiometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 1
Work steps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 1
4 _______Changes to previous version _____________________________________ 4 - 1
Siemens AG SPB7-230.841.03 Page 3 of 4 M300/1000/3000/3000 Nova
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0 - 4 Contents
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Prerequisites 1
General 1
This instruction describes:
in Chapter 2 - how to replace the compression mechanism in the compression unit of the
mammography systems MAMMOMAT 300 and MAMMOMAT 1000/3000/3000 Nova.
in Chapter 3 - how to replace the potentiometer R863 - the position transducer of the
compression unit.
Components concerned 1
Components concerned are the compression units/devices normally used on
MAMMOMAT 1000/3000/3000 Nova systems, on MAMMOMAT 300 systems and - with
some modifications - also used on MAMMOMAT Novation DR systems.
Material numbers
063 86 051 (used for the Sales Item)
065 21 681 (used for the Sales Item)
064 31 725 (used as Spare Part with REP-Status)
If you encounter compression units with material numbers that are not listed here, apply
this instruction appropriately. If necessary, contact CS HSC 24.
1 - 1
Tools required 1
Standard toolkit (including Allen keys with ball-shaped heads).
Resistance Measuring Instrument (e.g. Fluke - with Ohm-meter function).
Documents required 1
The technical documentation delivered with the corresponding MAMMOMAT system.
Mainly: Maintenance Instruction SPB7-230.105...
Service Program SPB7-230.114...
NOTICE
Strictly observe all safety precautions - as described in the
relevant technical documents - during work that involves
assembly, disassembly, removal of covers or work under voltage.
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1 - 2 Prerequisites
Parts included 1
Repair kit "Compression Mechanism and Potentiometer", Material Number
065 76 214 mainly contains:
(Details in Design Specification 65 76 214 EDS-01S-00)
Item Description Amount Remark
1 Compression mechanism 1 Assembly
2 Tool for compression unit 1 65 76 222
3 Spring pin 2.5 x 14 ISO 8752 2 60 53 656, if needed, because
original damaged, see Pos. 98
on Fig. 5.
4 Potentiometer, 2 kOhm 1W, 10% lin. 1 62 35 118
5 Allen key 1.3 mm 1
6 This repair instruction 1 SPB7-230.841.03.02
Time required 1
Approximately 1.5 hours for 1 person for exchange of the compression mechanism.
Approximately 3.0 hours for 1 person for exchange of the potentiometer.
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Procedure - Compression mechanism 2
Remove the covers from compression unit 2
• System OFF.
• Pry open the lid on the maximum compression force presetting knob. Loosen the screw
underneath the lid and remove the knob (1/Fig. 1).
Locking pin
2 - 1
3
1
2
3
Fig. 1
• Remove the cover from the manual compression/decompression knobs (2/Fig. 1).
• Release the locking pin on the upper and lower cover and remove the covers.
• Loosen the Allen screws on top and at the bottom of the compression unit holding the left
side cover (3/Fig. 1). Remove the side cover.
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2 - 2 Procedure - Compression mechanism
Replace the compression mechanism 2
• Loosen the Allen screw on the belt tightener and lower the belt tightener (1/Fig. 2).
Belt tightener
Drive belt
1
Fig. 2
• Remove the drive belt from the compression mechanism.
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Procedure - Compression mechanism 2 - 3
• Loosen the Allen screws holding the plate that keeps the curtain in place (1/Fig. 3).
Remove the plate and the curtain.
1
2
Curtain
Spindle
Fig. 3
• Loosen the Allen screw securing the spindle (2/Fig. 3).
• Push the spindle inwards until it reaches the back of the compression unit in order to
release the compression mechanism.
NOTE
Ensure that the manual compression/decompression knobs are
not in their lowest position. In the lowest position it is not
possible to push the spindle fully in towards the back of the
compression unit and the compression mechanism will not be
released.
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2 - 4 Procedure - Compression mechanism
• To loosen the compression mechanism, insert the compression mechanism tool into one
of the holes on the side of the compression mechanism. Turn the tool around until it
slides fully in (Fig. 4).
The holes have to
correspond
Fig. 4
• Loosen the compression mechanism with an adjustable wrench gripping the
compression mechanism tool and remove the compression mechanism.
• Apply threadlocker on the threads of the new compression mechanism and insert it.
• Insert the compression mechanism tool into one of the holes on the side of the
compression mechanism and turn the tool around until it slides fully in (Fig. 4).
• Fasten the compression mechanism with an adjustable wrench gripping the tool.
CAUTION
Be careful when fastening the compression mechanism.
Too much force may damage the brass parts. Such damage will
affect the smoothness of operation of the compression unit.
• Push the spindle back into its original position.
• Fully fasten the Allen screw securing the spindle. Loosen the Allen screw by 180 degrees
so it is not completely fastened.
NOTE
If the Allen screw is completely fastened it will prevent the spindle
from running smoothly and affect the operation of the
compression mechanism.
• Position the curtain in its original place, fit the plate over the curtain and fasten it with the
Allen screws.
• Put the belt tightener back and fit the drive belt of the belt tightener and compression
mechanism.
• Tighten the drive belt and fasten the Allen screw on the belt tightener.
• Assemble the covers in reverse order.
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Procedure - Compression mechanism 2 - 5
Test the compression function 2
Perform the applicable functional tests in the Maintenance Instructions, Chapter 4
(Compression and System Movements). If the tests result in incorrect values, use the
service PC to calibrate the compression function. Refer to the instructions in the Service
Program document, Chapter "Compression -> Calibration".
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2 - 6 Procedure - Compression mechanism
.
Fig. 5
Instead of exchanging the whole Compression mechanism (gear) delivered, the CSE can
decide to insert the spring pin 2.5 x 14 only - if that one was found shorn off. The new
Compression mechanism has nowadays a larger pin mounted, (sized 4 x 14 mm), the
danger of pin getting broken decreased.
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Procedure - Potentiometer R863 3
1
Fig. 1 Fig. 2
3 - 1
Exchange of Potentiometer 3
This part of the instruction describes the exchange of potentiometer R863, the position
transducer of the compression unit. Defects on the cord (cord torn, or similar) are
considered reason enough to exchange the whole compression unit. Allen keys of 2, 2.5,
3 and 4 mm with ball-shaped heads are needed, one Allen key sized 1.3 mm is supplied
with the repair kit to fit the securing radial grub screw of the (Teflon) pulley. The
compression unit does not necessarily need to be removed from the MAMMOMAT for this
repair.
However, the plastic covers of the tube assembly and of the carrier arm have to be
removed. Within the arm, right to the compression unit, the Connector X874 can be found.
This connector has to be disconnected when measuring the resistance value of the
potentiometer R 863. If it remains connected distorted values will be measured.
Work steps 3
• Remove tube arm covers, locate the connector X874 within the vertical arm to the right
from compression unit, carefully interrupt this connection with the help of a small
screwdriver.
• Drive slide manually into a middle position; remove lower cover by pulling the locking pin.
• Remove the lid of the knob of the potentiometer for F-max with the help of a sharp object
(e.g. knife), remove rotary knob by unscrewing internal screw. Remove upper cover by
pulling the locking pin.
• Mark and then remove the left and right side cover after unscrewing 4 screws on each
cover ( Note the difference of thread size; 2 x 2 x M4 on the top slab, 2 x 2 x M3 on the
bottom slab).
• Remove curtain / filmstrip from the top of the slide by unscrewing the two hex socket
head (Allen) screws holding the little plate (1/Fig. 1).
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3 - 2 Procedure - Potentiometer R863
• Unhook (e.g. by long-nose pliers) the lower end of the spiral spring from the rectangular
bracket (Fig. 2). Unwind the cord counter-clockwise.
• Unhook and detach the noose on the other end of the cord from the hex socket head
screw on the slide (this screw is secured by Loctite and should not be turned), unwind the
cord clockwise.
1
Fig. 3
• Unscrew and remove the two Allen screws fixing the carrier bracket of the potentiometer
to the upper slab (1/Fig. 4).
• If necessary, loosen upper cable clamp to enable more free movement of the
potentiometer.
• Carefully loosen the securing radial grub screw of the Teflon pulley by means of the
supplied Allen key 1.3 mm (1/Fig. 6); pull the pulley off the shaft of the potentiometer.
The grub screw is tiny and can get lost easily. Loosen only, don't remove this screw.
Having removed the pulley, adjust the grub screw so that it will enable a somewhat tight
fitting of the pulley onto the shaft of the new potentiometer.
• Pull the carrier bracket with ball-bearing off the shaft of the potentiometer. It may be a bit
difficult if shaft scratched. Note on which side of the bracket the Seeger circlip ring was
placed.
• Unscrew and remove the potentiometer from its metal enclosure, if any; note down the
numerical and color coding and de-solder the wires (Fig. 3). As help here the usual
coding (observe the reality, it can differ!).
Resistor: 1 - with 2 x grün/green, or orange wire
Sliding contact: 2 - with 1 x weiß/white, or grey wire
Resistor end: 3 - with2 x gelb/yellow, or violet wire
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Procedure - Potentiometer R863 3 - 3
• Attach and solder the wires onto the contact lugs of the new potentiometer. Place it into
its metal enclosed observing the position of the little pin (1/Fig. 3) which should prevent
its turning; apply the washer and the mounting nut and tighten it.
• Push the carrier bracket with the ball bearing onto the potentiometer shaft, place the
assembly onto the upper slab, and tighten the two hex socket head screws.
• Re-attach the upper cable clamp, if necessary; the wires should not touch moving parts
(the toothed belt).
• Drive the slide manually down to the lower limit.
1
Fig. 4 Fig. 5
1
Fig. 6 Fig. 7
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3 - 4 Procedure - Potentiometer R863
• Ensure that the potentiometer with its metal enclosure does not fall out of the carrier
bracket (Fig. 4) and place the Teflon pulley onto the potentiometer shaft in such a
position that the noose of the cord, wound counter-clockwise a bit onto the pulley, can
just be hooked back to the hex socket head screw. Hold the pulley and continue with
winding the other cord about four (4) turns/windings of 360°, then hook the lower end of
the spiral spring back onto the rectangular bracket. (The upper end of the spring will be
just some 3 cm from the pulley).
Fig. 8 Fig. 9
• Attach an ohmmeter to soldering lugs 1 and 2 of the new potentiometer. As an alternative
the corresponding contacts on compression device end of the now disconnected and
freely accessible connector X874 can be used (Fig. 5).
Adjust the measured resistance applying a screwdriver through the hub of the pulley to
the groove on the end of the potentiometer shaft (Fig. 6). Start from a lower resistance
value and turn the screwdriver clockwise until reaching 230 Ohm +
of the pulley, mark the exact position of the groove (Fig. 7).
• Hold the potentiometer in place (Fig. 8) and drive the slide manually upwards. During
this, look through the pulley hub and observe whether the shaft turns clockwise exactly
as the pulley does, and whether the groove and its marked position on the pulley
coincide. Help with a screwdriver if the pulley, fixed only lightly, does not turn the shaft.
In order to turn the pulley enough to get access to the grub screw, the slide has to go up
about two (2) cm.
When the grub screw becomes visible from the front, press the pulley gently towards the
carrier bracket and tighten the grub screw with the Allen key 1.3 mm (1/Fig. 9).
1
20 Ohm. On the side
• Drive the compression slide manually back into its lowest position and check the
resistance value again to ensure that it is within tolerance. If necessary repeat the
adjustment: For this the grub screw has to be loosened (see previous work step).
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Procedure - Potentiometer R863 3 - 5
• Drive the compression slide manually into its uppermost position. During this observe
the cord carefully to determine whether the winding of its one end and the unwinding of
its other end occurs freely. It is essential that the winding cord does not obstruct the
unwinding one. If this is not the case, disentangle the windings of the cord on the pulley.
In the uppermost position, read the resistance measured, typically it will be around 1435
Ohm.
• Drive the slide fully down and re-check the resistance to ensure it is still within limits,
i.e. 230 Ohm +
• The procedure of driving the slide down and up and concurrently observing the winding
and unwinding of the cord, and then checking the resistance value at the lower limit, can
be repeated one or two times. The adjustment can be considered successful if the
measured resistance value is within the given tolerance; more important: the assembly
was successful if the winding/unwinding of the cord works well.
• Attach the curtain / filmstrip back onto the slide.
• Mount the left and right side cover.
• Fix the upper cover with locking pin; mount the knob and its lid back onto the shaft of the
potentiometer for F-max.
20 Ohm.
• Attach the lower cover. Reconnect securely the connector X874. Insert the connector
back into the space within the vertical part of the arm.
• Proceed with the calibration of compression as described in the paragraph Compression
Calibration, in the Chapter: Adjustment and Service Program, document print No.
SPB7-230114.03, (mainly Thickness top/bottom).
• Re-attach the plastic covers of the tube assembly.
• Demonstrate the unit in working condition and hand over to customer.
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3 - 6 Procedure - Potentiometer R863
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Changes to previous version 4
Chap. 0 Front page and index newly generated
Chap. 1 New
Chap. 3 New
4 - 1
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4 - 2 Changes to previous version
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