Siemens Polymobil Plus Service manual [gb]

POLYMOBIL Plus

Service Instructions

From Serial No. 12000

SP

© Siemens AG 2002

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.: SPR8-125.061.03.02.02 Release Date: 08.03

Replaces: SPR8-125.061.03.01.02

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.

Letzte Seite des Kapitel

POLYMOBIL Plus SPR8-125.061.03 Page 2 of 4 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Contents 0 - 3

Page

1 _______Prerequisites __________________________________________________ 1 - 1

Text emphasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 1

Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 1

Required documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 2

Tools, measurement and auxiliary devices . . . . . . . . . . . . . . . . . . . . . . . 1 - 2

Safety information and protective measures . . . . . . . . . . . . . . . . . . . . . . 1 - 3

Replacing damaged or missing screws . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 5

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 5

2 _______Checking the assemblies ________________________________________ 2 - 1

Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1

Position and function of the LED’s, fuses, test points and potentiometers . . . . . . . 2 - 4

D915 CPU, control and measurement value acquisition . . . . . . . . . . . . . . 2 - 4

D925 rotating anode starter, filament inverter, ON/OFF switching circuit . . . . . . 2 - 5

U1 power supply unit 5 V ± 5 % / 15 V ± 10 % . . . . . . . . . . . . . . . . . . . 2 - 6

U2 power supply unit 12.5 V ± 10 %. . . . . . . . . . . . . . . . . . . . . . . . . 2 - 6

D950 capacitor charging circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 7

D970 capacitor bank. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 7

Status of the LED’s (optimum condition) . . . . . . . . . . . . . . . . . . . . . . 2 - 8

3 _______Troubleshooting________________________________________________ 3 - 1

Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 1

Troubleshooting after error messages. . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 2

4 _______Service programs ______________________________________________ 4 - 1

Service programs available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 2

5 _______Measurements _________________________________________________ 5 - 1

Line voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1

Measuring KVact and Itube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1

Capacitor charging circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 2

Charging frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 2

Capacitor charging current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 3

Capacitor voltage (Uc) and charging time . . . . . . . . . . . . . . . . . . . . . . 5 - 4

Rotating anode starter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 5

Acceleration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 5

Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 6

kV control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 7

Checking the maximum main inverter frequency . . . . . . . . . . . . . . . . . . 5 - 7

Measuring the oscillating current . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 8

Measuring the kVact and kVnom . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 10

Error in the kVact acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 11

Testing the filament circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 12

Filament circuit in standby . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 12

Siemens AG SPR8-125.061.03 Page 3 of 4 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

0 - 4 Contents

Page

Setting the maximum filament inverter frequency . . . . . . . . . . . . . . . . .5 - 13

Measuring the filament nominal value . . . . . . . . . . . . . . . . . . . . . . .5 - 14

Setting the tube current for the exposure . . . . . . . . . . . . . . . . . . . . . .5 - 14

Testing and setting the mAs counter . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 16

Coincidence of light and radiation fields . . . . . . . . . . . . . . . . . . . . . . . .5 - 17

Testing and readjusting the counterbalance . . . . . . . . . . . . . . . . . . . . . .5 - 20

Readjusting the counterbalance with accessories attached . . . . . . . . . . . . . .5 - 20

6 ______ Replacing important components _________________________________6 - 1

Replacing the single tank generator . . . . . . . . . . . . . . . . . . . . . . . . . . 6 - 1

Replacing the collimator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 - 3

Replacing the lamp for the localizer . . . . . . . . . . . . . . . . . . . . . . . . . . 6 - 4

Replacing the steering caster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 - 6

Replacing the capacitor bank. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 - 7

7 ______ DAP measuring system (option) __________________________________7 - 1

Recalibration of DAP measuring system . . . . . . . . . . . . . . . . . . . . . . . . 7 - 1

Required equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 1

Recalibration procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 1

Miscellaneous service issues. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 3

8 ______ Changes to previous version _____________________________________8 - 1

Letzte Seite des Kapitel 0

POLYMOBIL Plus SPR8-125.061.03 Page 4 of 4 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Prerequisites 1

Text emphasis 1

1 - 1

DANGER

WAR NING

CAUTION

NOTICE

NOTE

DANGER indicates an immediate danger that is likely to result in
death or serious physical injury.

WARNING indicates a risk of danger that may lead to death or to
serious physical injury.

CAUTION used in conjunction with the safety alert symbol indi­cates a risk of danger that is likely to result in slight or moderate
physical injury and/or damage to property.

NOTICE used without the safety alert symbol indicates a risk of
danger that if disregarded leads to or may lead to an undesirable
result or state other than death, physical injury or damage to
property.

NOTE contains information that emphasizes proper use of the
equipment or proper execution of a procedure, i.e. hints, tips.

Symbols 1

Checks and adjustments that must be performed with radiation ON are identified by the
radiation warning symbol.

This symbol means "Dangerous voltage".

Checks marked with this symbol are to be entered into the test certificate at the end of
these instructions.

This symbol means "Attention, consult the documentation".

This symbol indicates components sensitive to electrostatic discharge (ESD).

Siemens AG SPR8-125.061.03 Page 1 of 6 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

1 - 2 Prerequisites

Required documents 1

• Block circuit diagram X 069I

• Function description SPR8-125.041...

• Instructions for use SPR8-125.201.02...

NOTE

A detailed A 3 circuit diagram can be ordered under item
number 18 20 377 X069I.

Tools, measurement and auxiliary devices 1

NOTE

.

• Standard service kit*

• Digital multimeter

• 2-channel memory oscilloscope

• mAs meter

• Dose meter

• Protective conductor meter

• Equivalent leakage current meter

• Torque wrench 20 Nm - 100 Nm

• Loctite 242

• Current transformer (50 A : 50 mA)*

In addition, a metal film resistor with
10 Ohms; 0.5 W; 1 % is required*
Refer also to Speed Info 06/91

• Calibration tool for DAP measuring system (Part No. 65 84 978)

All tools, measurement and auxiliary devices with the exception
of those marked " * " are listed along with their specifications in
the STC (Service Tools Catalog).

(Part No. 31 51 289)

WAR NING

Dangerous electrical voltage present during service work!

• Risk of death or serious physical injury.

• The oscilloscope has to be connected to ground to perform

measurements. A TEK video isolator and the trigger set have to
be used when ground loops may distort the measurement
results (see ARTD-002.731.22..).

POLYMOBIL Plus SPR8-125.061.03 Page 2 of 6 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Prerequisites 1 - 3

Safety information and protective measures 1

NOTICE

WAR NING

• The following items must be complied with when performing

service work and tests:

- The product-specific safety information in the document

- The safety information in TD00-000.860.01.. in the Register of

the POLYMOBIL Plus binder

- The safety information contained in ARTD Part 2.

Dangerous X-radiation during checks and adjustment work steps.

Risk of death or serious physical injury.

For checks and adjustments that must be performed with radia­tion switched on, the prescribed radiation safety measures must
be observed; if necessary, wear radiation protective clothing (see
also ARTD-002.731.02.. and ARTD-002.731.38.. General Guide­lines for Technical Service). These checks and adjustments are
explicitly identified on the following pages with the radiation
warning symbol .

Siemens AG SPR8-125.061.03 Page 3 of 6 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

1 - 4 Prerequisites

4

R

3

R

5

R

1

C

C

C

V

-

+

Fig. 1

DANGER

When working on the open system, there is a danger of

Electric shock

!

Contact with current-carrying parts will lead to death or to serious
physical injury.

• The capacitor bank can still be charged.

Do not attempt to work on the system while this condition exists.

• After switching off the system, approximately 450 V may still be

present in the system, even after disconnecting the line voltage
plug. Within 10 minutes this voltage will drop to approximately
10 V.

• Always measure the actual voltage present with the DVM at test

points -VCC and + VCC on the D 960 inverter board or (more
accessible) on the D 970 capacitor board at the + connection
point of capacitor C3 and on the right side of fuse F3 (see Fig. 1).

• LED’s V1 ... V10 on D 970 go out at a significantly higher voltage level

and therefore are not reliable safety indicators.

• If a fuse on the D 970 has responded, high voltage may still be present

at the affected capacitor even after a prolonged period of time.

• The capacitor discharging circuit utilizes the D925 board, CS and LS

relays. If connectors X3 or X9 on D 925 or D 950 are not inserted or if
there is a defect in the circuit, the C-bank will not discharge.
This can cause life-threatening voltage to be present in the system
even after a prolonged period of time.

• Refer also to chapter "Replacing the capacitor bank".

POLYMOBIL Plus SPR8-125.061.03 Page 4 of 6 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Prerequisites 1 - 5

• Connect the POLYMOBIL Plus only to a line voltage supply (line voltage receptacle) that

complies with the requirements of VDE 0107 or corresponds to the local national
regulations.

• Disconnect the POLYMOBIL Plus at the line voltage OFF switch on the operating

console and disconnect the line voltage plug prior to any service work.

• Remove or insert boards with the generator switched OFF only; observe

ESD guidelines when handling boards.

Replacing damaged or missing screws 1

• Damaged or missing screws may only be replaced by steel screws as specified in the

installation drawings conforming to DIN267 and must have the specified tensile strength.

NOTICE

Replacement of screws.

All Allen screws must have a tensile strength rating of 8.8 !

Cleaning 1

• The unit must always be switched off or disconnected before cleaning.

• Use only water to clean the unit or a lukewarm, diluted solution consisting of water and a

household cleaning agent.

• Do not use abrasive cleaning agents or organic solvents such as benzine, alcohol or spot

remover. Do not spray with water.

• For additional information, refer to the Instructions for use, chapter "Cleaning/

Disinfection".

Siemens AG SPR8-125.061.03 Page 5 of 6 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

1 - 6 Prerequisites

This page intentionally left blank.

POLYMOBIL Plus SPR8-125.061.03 Page 6 of 6 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Checking the assemblies 2

Preparation 2

4

R

3

R

5

R

1

C

C

C

V

-

+

Fig. 1

2 - 1

DANGER

When working on the open system, there is a danger of

Electric shock

!

Contact with current-carrying parts will lead to death or to serious
physical injury.

• The capacitor bank can still be charged.

Do not attempt to work on the system while this condition exists.

• For details see chapter "Prerequisites".

Siemens AG SPR8-125.061.03 Page 1 of 8 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

2 - 2 Checking the assemblies

1

Fig. 2 Fig. 3

To check the assemblies and remove the upper covers, the handles and the lower front
cover of the switchbox.

Proceed as follows:

• Switch POLYMOBIL Plus OFF and disconnect the line voltage plug.

• Remove the four Allen screws (1/Fig. 2) in the handle and remove the handle

(see Fig. 2 and Fig. 3).

POLYMOBIL Plus SPR8-125.061.03 Page 2 of 8 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Checking the assemblies 2 - 3

2

3

2

3

Fig. 4 Fig. 5

• Remove the four Allen screws at the bottom of the switchbox cover (2/Fig. 4) and remove

the cover.

• After removing the four panel screws (3/Fig. 4), remove the bottom cover at the front with

the cassette tray.

WAR NING

When working on the open system, there is a danger of

Electric shock

Risk of death or serious physical injury.

Always measure the actual voltage present with the DVM at test
points -VCC and + VCC on the D 960 inverter board or (more
accessible) on the D 970 capacitor board at the + connection
point of capacitor C3 and on the right side of fuse F3.

!

4

• Remove the four screws of the top housing (4/Fig. 5)

• To stay clear of the exposure guide holder, tilt the housing forward and lift it up to

remove it.

Siemens AG SPR8-125.061.03 Page 3 of 8 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

2 - 4 Checking the assemblies

Position and function of the LED’s, fuses, test points and potentiometers

NOTE

D915 CPU, control and measurement value acquisition 2

LED:

V22 Preparation ON
V23 Exposure ON
V24 Error occurred
V25 not used
V34 Radiation ON

Test points:

X15 Pin Color

1 black Ground (+ 5 V)
3 black Ground (+ 5 V)
4 red + 5 V
5brown+15 V
6 blue Ground (+/- 15 V)
7 yellow -15 V

Potentiometers:

See block diagram for the location of components and boards.

± 5 %

± 10 %

± 10 %

2

P1 Setting of the mAs counter
P2 OFFSET mAS - converter

Set at the factory - Do not change!

P3 Max. filament inverter frequency
P4 Max. main inverter frequency
P5 Adjustment/setting of filament heating circuit
P6 Nominal filament current (standby), nominal tube current (exposure)

Set at the factory - Do not change!

P7 Nominal kV value

POLYMOBIL Plus SPR8-125.061.03 Page 4 of 8 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Checking the assemblies 2 - 5

Reset - switch
SW2

SW2

Fig. 6

P4

P3
P2
P1

GND JR

ST

X12

X15

V34

1

V22

VC BAT

V23 V24 V25

SCM VR

KVM

Service

D 915

P5

REG CAL KVP

P6

P7

X11

1 1

KV KVN IH JRS KVS F1 I I1 I2

X10 X20

TRG JIM SCH GND

D925 rotating anode starter, filament inverter, ON/OFF switching circuit 2

LED:

VP +15 V for inverter frequency ok
+12V +12.5 V auxiliary voltage ok
I/O +12.5 V auxiliary voltage for I/O ok
AR Line voltage for anode starter ok
+DC, -DC 300 V voltage for filament ok

Fuses:

F1 10 AT + 12.5 V for collimator lamp
F3 0.6 AT Auxiliary voltage +12.5 V for I/O
F4 0.6 AT Auxiliary voltage +12.5 V
F5 3.2 AF Line voltage for anode starter
F6 1.0 AT Line voltage for filament circuit
F7 10 AT Power
F8 10 AT Power

Siemens AG SPR8-125.061.03 Page 5 of 8 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

2 - 6 Checking the assemblies

Measurement points:

VP +15 V
P12 + 12.5 V
GNDL Ground (+ 12.5 V)

X4 Pin Color

1 red +12.5 V
2 red +12.5 V
3 red +12.5 V
4 black Ground (+12.5 V)
5 black Ground (+12.5 V)
6 black Ground (+12.5 V)

± 10 % for inverter frequency

± 10 % auxiliary voltage

± 10 %
± 10 %
± 10 %

U1 power supply unit 5 V ± 5% / 15 V ± 10 % 2

Fuse: 2 A T

U2 power supply unit 12.5 V ± 10 % 2

Fuse: 5 A T

POLYMOBIL Plus SPR8-125.061.03 Page 6 of 8 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Checking the assemblies 2 - 7

D950 capacitor charging circuit 2

LED:

LINE (V25) Line voltage ok
450 VCC (V30) Capacitor voltage present (the voltage can also be considerably lower

than 450 V)

Fuse:

F1 10 AT Charging circuit

Test points:

ERR Error output charging error
VC Capacitor voltage 1 V 100 V
IC Capacitor charging current
FR1 Charging circuit frequency (dependent on the line voltage and VC)
GND Ground
CAR Signal to enable the charger
FR2 Frequency of the auxiliary power supply
OK Signal to indicate the full charge

D970 capacitor bank 2

LED:

V1 - V10 Capacitor voltage present at C1 - C10

Fuse:

F1 - F10 20AF Capacitor charging voltage for C1 - C10
F11 80AF Capacitor voltage for inverter
F12 20AF Charging voltage for capacitor bank

Test points:

-VCC, +VCC Capacitor voltage

Siemens AG SPR8-125.061.03 Page 7 of 8 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

2 - 8 Checking the assemblies

Status of the LED’s (optimum condition) 2

a) POLYMOBIL Plus OFF, line voltage plug connected:

D925: LED +12 V ON

LED I/O ON

D950: LED 450 VCC (V30) glows for 10 minutes following shutdown

D970: all LED’s glows for 10 minutes following shutdown

b) POLYMOBIL Plus ON

D915: The exposure values are displayed

D925: LED VP ON

LED +12 V ON
LED I/O ON
LED AR ON
LED +DC ON
LED -DC ON

D950: LED LINE (V25) ON

LED 450 VCC (V30) ON

D970: all LED’s ON

c) Preparation

All LED’s as described under b) and also V22 on D915.

d) Exposure

, standby

All LED’s as described under b) and also V22 and V23 as well as radiation indicator V34
on D915.

In the case of an error, V24 on D915 glows (red).

POLYMOBIL Plus SPR8-125.061.03 Page 8 of 8 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Troubleshooting 3

Error messages 3

3 - 1

NOTE

• Error messages Err 1 and initialization errors Err 90, Err 96 and

Err 97 block the generator so that the system must be switched
off and switched back on again.

• "StandBy" error messages disappear when the error is cleared.

• Error messages which occur during an exposure will continue to

flash until another key is activated.

a) During initialization

Err 90 EPROM checksum
Err 96 KVnom error
Err 97 mAnom error

b) During standby

Err 1 Capacity charge error Charging circuit error
Err 2 +15 VError
Err 3 Vfil < Vstby
Err 4 Vfil > Vstby
Err 5 KVact ≠ 0
Err 6 mAact ≠ 0
Err 7 Rot ≠ 0
Err 8 Braking failure Error in the rotating anode circuit
Err 9 Pressure switch Oil pressure switch in the single tank

is active
Err 30 Fast capacitor charge Capacitor bank is charging too fast
Err 31 Slow capacitor charge Capacitor bank is charging too slow
Err 33 Inverter Error
Err 34 Filament circuit Inverter Short Cir-

cuit

c) During exposure

Err 10 Rot
Err 11 Short circuit in main inverter Short circuit in the main inverter
Err 12 KVmax
Err 13 Imax
Err 14 KVact < KVnom
Err 15 mAact < mAnom
Err 17 Maximum exposure time Max. exposure reached
Err 18 Exposure not completed Exposure time not completed (expo-

Err 20 Capacitor not ready Capacitor bank not completely

Err 21 Vfil > Vmax during prep Maximum filament heating exceeded

Err 22 Maximum prep time Max. preparation time exceeded

Siemens AG SPR8-125.061.03 Page 1 of 4 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

= 0 No rotating anode acceleration

sure release switch released)

charged

during preparation

3 - 2 Troubleshooting

Troubleshooting after error messages 3

Err 1 Capacitor charge error

- Has the system not been used for a long period of time
(higher capacitor leakage current)?

w If the error occurs after switching the system off and back

on again, configure the capacitor bank
(see chapter "Service program", page 4-2).

- Are the discharge resistors permanently connected?

- Has the temperature sensor on D950 responded
(D950 TP ’TP’)?

- Has overvoltage been detected in the C-bank? (D950 TP ’VC’)

- Is there a short on D950? The error appears only when the short circuit is
continuous.

Replace D950.

Err 2 + 15 V - Error

- Check the fuse on power supply U1.

- Is power supply U1 defective?

Err 3 Vfil < Vstby (no or insufficient filament current)

- Do ’V1’ (-DC) and ’V2’ (+DC) flash on D925? Otherwise check fuse F6.

- No filament frequency? Check D915.

- Connection D925 =>X-ray tube unit (X5).

- Connection D925 => D915 (X11).

- Check X-ray tube assembly.

- D925 defective.

Err 4 Vfil > Vstby (filament current is too high)

- Do ’V1’ (-DC) and ’V2’ (+DC) flash on D925? Otherwise check fuse F6.

- Filament frequency too high?

- A/D converter on D915 defective? => Replace D915.

- Short circuit at the output of the filament inverter =>check connection to/in
the X-ray tube assembly.

Err 5 KVact 0

Err 6 mAact 0

≠

- No connection to the single tank generator (D915 X8)?

- Plug-in connection on D900 in the single tank generator ok?

≠

- Error in the measurement acquisition on D915? => Replace D915.

- No connection to the single tank generator (D915 X8)?

- Plug-in connection on D900 in the single tank generator ok?

Err 7 Rot 0 (rotating anode speed 0)

POLYMOBIL Plus SPR8-125.061.03 Page 2 of 4 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

≠≠

- Error on D915 or D925.

Troubleshooting 3 - 3

Err 8 Braking failure (error when braking the rotating anode - a current was

measured in the auxiliary capacitor C2 during braking.)

- D915TP ’I1’. No current

- D915 TP ’I2’. Braking current must be measured here.

- TRIAC ’V7’ or ’V8’ defective? => Replace D925.

Err 9 Pressure switch (oil pressure switch in the single tank generator is

active)

- Tube is overheated?

- Measure D915 plug X8 at pin 8. In case of malfunction, 0 V are measured.

Err 10 Rot = 0 (rotating anode speed is 0 on exposure)

The error is only displayed as long as preparation is depressed.

- LED ’AR’ on D925 flashes; is fuse F5 ok?

- Measure at TP ’I1’ and ’I2’. Current has to be present during acceleration.

- Check D925.

- Is the power factor correction capacitor C2 defective?

- Connection to/in the single tank generator ok?

Err 11 Short circuit in main inverter

- Check D960.

- Check D915.

- Main inverter frequency too high?

must be measured here when braking.

Err 12 KVmax

- Interruption of KVact measurement. Measure TP ’KVN’ and ’KVP’ on D915.
Both signals must have the same amplitude.

- ’KVN’ or

’KVP’ > 70 kV.

- Error in kV measurement circuit?

- Error in kV control circuit?

Err 13 Imax

The tube or filament current is recorded.

- Check the filament circuit.

- Exposure filament basic value incorrectly set (P5 on D915)?

- Tube arcing?

If kVact < kVnom, Err 14 or Err 13 is detected and displayed. See also trouble­shooting information under Err 14.

Err 14 KVact < KVnom

- Voltage in the capacitor bank too low (D950 TP ’VC’)?

- Defective capacitors /fuses on the capacitor bank (D970)?

-No KVact?

- Error in the measurement circuit on D915?

- Main inverter frequency too low?

- Defect in the main inverter D960?

Err 15 mA

ACT

< mA

NOM

- Check the filament circuit.

Siemens AG SPR8-125.061.03 Page 3 of 4 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

3 - 4 Troubleshooting

Err 17 Maximum exposure time (max. exposure time reached)

- Filament current too low?

- mAs counter is set incorrectly (P1 on D915)?

Err 18 Exposure not completed (exposure not completed by the system - expo-

sure switch was released)

- Operator error?

- Intermittent contact in the release switch?

- Error in the exposure release circuit?

Err 20 Capacitor bank not ready

Device was not ready yet / had not released yet.

- F1 on D950 defect?

- Error on D950?

Err 21 Vfil > Vmax (max. filament heating exceeded during preparation)

- Error during the acquisition of the filament heating?

- Basic value of the exposure filament incorrectly set (P5 on D915)?

- Error on D915?

Err 22 Maximum preparation (preparation time too long)

- Prep level pressed too long.

Err 30 Fast capacitor charge (capacitor bank charges too fast)

- Are all fuses on the capacitor bank (D970) ok?

- Are there defective capacitors?

- Is the line voltage too high (> 250 V)?

- Is the charging frequency too high?

- Configure the capacitor bank.

- D950 defect?

Err 31 Slow capacitor charge (capacitor bank charges too slow

- ’V25’ (line) on D950 flashing? Check fuse F1

- No or insufficient charging frequency?

- Check D950 (’V22 - V24’ defective?)

- Poor connections to/in the capacitor bank?

Err 33 Inverter Error

- Check ribbon cable X20.

- FMAX not adjusted?

- IGBT short-circuited?

Err 34 Filament Inverter short-circuit

- FMAX not adjusted?

- IGBT short-circuited?

)

Err 90 EPROM checksum

- EPROM defective.

Err 96 kVnom failure (hardware error, see also Err 5)

Err 97 mAnom failure (hardware error, see also Err 6)

POLYMOBIL Plus SPR8-125.061.03 Page 4 of 4 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Service programs 4

SW2

4 - 1

2

Fig. 1

P4

P3
P2
P1

GND JR

ST

X12

X15

1

"OPEN"

V22

V23 V24 V25

Service

D 915

P5

P6

P7

X11

1 1

X10 X20

1

REG

CAL

KVP

KVN IH JRS KVS

KV

To bypass the service mode, the ST slot (1/Fig. 1, below the display on D915) has to be
jumpered before switching on the POLYMOBIL Plus.
As soon as "Pr. 1" appears in the display, bring the jumper back to the "OPEN" position.

F1 I

I1 I2

TRG

JIM

SCH GND

VC BAT KVM SCM VR

KV +/- Keys toggle between the programs. When you are

already in a program, the next or previous program step
is selected.
Setting of the kV values in "Pr. 5" and "Pr. 6".

mAs +/- Setting of the mAs values in "Pr. 5" and "Pr. 6".

Lamp switch Activating or quitting the current program.

To quit the service mode, switch the POLYMOBIL Plus off/on or press the Reset button
SW 2 (2/Fig. 1).

Siemens AG SPR8-125.061.03 Page 1 of 2 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

4 - 2 Service programs

Service programs available 4

Pr. 1 Configures the capacitor bank.

After starting the service program, "CAP 150" appears on the display.
The voltage of the capacitor increases in increments (approx.) from 150
V to 250 V, 330 V, 400 V, 430 V up to 440 V.
The program remains at each step for about 6 minutes at the 150 V to
440 V level.
The system remains at the 440 V level for one hour after which

the program automatically ends; "CAP END" appears on the display.
Pr. 2 Reads out the exposure counter.
Pr. 3 Error memory with up to 20 errors.The left display indicates how many

errors occured.The error message is displayed in the right display. The

latest error is displayed first.
Pr. 4 Deletes error memory.

Press mAs + key for approximately 4 seconds.
Pr. 5 Sets the default exposure parameters (according to customer request).
Pr. 6 Sets the maximum possible KV and mAs values (according to customer

request).
Pr. 7 Adjusts FMAX on the main inverter.

"ADJ F" appears on the display after starting the service program.

Press S27.

"F on" appears on the display.

FMAX can be measured at TP "REG" on D 915 and can be set with

potentiometer P4.
Pr. 8 Tests the anode starter unit.

Press S 27.
Pr. 9 Tests the filament unit.

"FIL 3" appears on the display after starting the service program.

Press S27.

Filament boosts; "FIL 5" appears on the display.

NOTE

There is no radiation present during these service programs.

POLYMOBIL Plus SPR8-125.061.03 Page 2 of 2 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Measurements 5

Line voltage 5

The line voltage must be set to 110 V (+ 10%) or 230 V (+ 10%).
The line voltage is adjusted automatically.

Measuring KVact and Itube 5

• Connect the oscilloscope to TP "JR", "KV" and "GND" on D915.

CH1 TP "JR" 1.0 V/Div
CH2 TP "KV" 1.0 V/Div

Ground at "GND"
10 ms/Div
Trigger external at TP "TRG"

• Set 90 kV and 10 mAs at the POLYMOBIL Plus and release an exposure.

The oscillogram should correspond to that shown in Fig. 1.

5 - 1

Fig. 1

Siemens AG SPR8-125.061.03 Page 1 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 2 Measurements

Capacitor charging circuit 5

NOTE

Signals are only present during charging of the capacitors.

Charging frequency 5

• Connect the oscilloscope to D 950 at TP "FR1" and "GND".

CH1 TP "FR1" 5.0 V/Div

Ground at "GND"
20 µs/Div

• After switch on, the following oscillogram can be measured:

Fig. 2

The capacitor charging frequency is 25 kHz and cannot be adjusted.

POLYMOBIL Plus SPR8-125.061.03 Page 2 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Measurements 5 - 3

Capacitor charging current 5

• Connect the oscilloscope to D 950 at TP "IC" and "GND".

CH1 TP "IC" 500 mV/Div

Ground at "GND"
20 µs/Div

• After switch on, the following oscillogram can be measured:

Fig. 3

The charging current depends on the line voltage present and on the charge status
(capacitor voltage U
Fig. 3 shows the charging current in standby

) of the capacitor bank.

c

, i.e. when the C-bank is charged.

Siemens AG SPR8-125.061.03 Page 3 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 4 Measurements

Capacitor voltage (Uc) and charging time 5

In exposure-ready status, the capacitor voltage is approximately 440 V and can be mea­sured on D 950 TP "VC".
If the device is switched off because of overvoltage, the signal "ERR" is output on D950

WAR NING

The charging time depends upon the residual charge of the capacitor bank and on the
available line voltage, e.g. with 230 V the max. charging time is about 15 s.
In the worst case, (line voltage <100 V and residual charge = 0 V), the charging time
can be 40 seconds.

For the following measurement, the line voltage was 230 V and the residual charge 30 V.

When working on the open system, there is a danger of

Electric shock

Risk of death or serious physical injury.

You can measure the capacitor voltage at TP "VC" only if
POLYMOBIL Plus is switched on.

!

D915 test point "VC" (1 V 100 V)

Fig. 4

POLYMOBIL Plus SPR8-125.061.03 Page 4 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Measurements 5 - 5

Rotating anode starter 5

Acceleration 5

Fig. 5 shows the stator currents during rotating anode acceleration (230 V).

Fig. 5

CH2 D915 test point "I1" (1 V 0.25 A)
CH1 D915 test point "I2" (1 V 0.25 A)
10 ms /Div

NOTE

The currents are correspondingly lower at 100 V line voltage.

Siemens AG SPR8-125.061.03 Page 5 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 6 Measurements

Brakes 5

Fig. 6 shows the stator currents during braking (230 V)

Fig. 6

CH2 D915 test point "I1" (1 V 0.25 A)
CH1 D915 test point "I2" (1 V 0.25 A)
10 ms /Div

NOTE

The currents are correspondingly lower at 100 V line voltage.

POLYMOBIL Plus SPR8-125.061.03 Page 6 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Measurements 5 - 7

kV Control 5

Checking the maximum main inverter frequency 5

NOTE

It is generally not necessary to set the main inverter frequency in
the field. When ordered as a replacement, D915 is preset at the
factory.

• Connect the oscilloscope to D915 at TP "REG" and "GND".

• Measure F

(See "Service program", section on "Service programs available")

5 V/Div.

in the service program Pr. 7

MAX

Fig. 7

20

µs/Div.

0 →

F

= 18 kHz

MAX

T

MIN

= 55.5 µs

Tolerance: -1.5 µs /+1.5 µs

• Setting the maximum main inverter frequency with potentiometer P4

on D 915.

Siemens AG SPR8-125.061.03 Page 7 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 8 Measurements

Measuring the oscillating current 5

WAR NING

When working on the open system, there is a danger of

Electric shock

Risk of death or serious physical injury.

Prior to beginning the following instructions, you must discharge
the capacitor bank because life-threatening DC voltage is
present. Check the actual charge with the DVM.

!

• Switch OFF POLYMOBIL Plus and wait until the capacitor voltage has dropped to a

value < 10 V.

• Disconnect the cable from the inverter to capacitor C1. Push the cable through the

current transformer 50 A : 50 mA (with a parallel resistor of 10 ohms) and reconnect the
cable.

• Connect the oscilloscope to the current transformer.

• Switch ON POLYMOBIL Plus.

• Set 60 KV, 10 mAs on POLYMOBIL Plus and release exposure.

The diagram must correspond to Fig. 8.

NOTICE

Maximum main inverter frequency

The maximum main inverter frequency can only be measured in
the ascending part of the high voltage, i.e. in the first microsec­onds, because afterwards the frequency is lower.

POLYMOBIL Plus SPR8-125.061.03 Page 8 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Measurements 5 - 9

Fig. 8

CH2: 1 V/Div, Trigger: Test point "TRG" external on D 915
20 µs /Div

Siemens AG SPR8-125.061.03 Page 9 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 10 Measurements

Measuring the kVact and kVnom 5

• Connect the oscilloscope to D915 at TP "KV", "KVS" and "GND".

• Set 60 KV, 10 mAs on POLYMOBIL Plus and release exposure.

• The oscillogram must appear as shown in Fig. 9.

• The KVnom value can be set with P7 on D915.

Fig. 9

kVact: CH1 D915 test point "KV" 1 V 20 KV
kVnom: CH2 D915 test point "KVS" 1 V 30 KV

20 ms /Div

POLYMOBIL Plus SPR8-125.061.03 Page 10 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Measurements 5 - 11

Error in the kVact acquisition 5

Fig. 10 shows that one kVact cable from the single tank generator to the D915 is damaged
or disconnected.
The monitor (KVM) responds (curve 3) because KVN and KVP have different amplitudes;
the exposure is terminated with ERR 12.
Refer to function description "KV monitoring".

Fig. 10

Exposure data: 102 KV 10 mAs

KVact: CH1: D915 test point "KV"
Itube: CH2: D915 test point "JR"

CH3: D915 test point "KVM"

1 ms /Div

Siemens AG SPR8-125.061.03 Page 11 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 12 Measurements

Testing the filament circuit 5

Filament circuit in standby 5

• Connect the oscilloscope to D915 at TP "CAL", "I" and "GND".

Fig. 11

Filament inverter frequency CH1: D915 test point "CAL"
Filament current CH2: D915 test point "I"

POLYMOBIL Plus SPR8-125.061.03 Page 12 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Measurements 5 - 13

Setting the maximum filament inverter frequency 5

The maximum filament inverter frequency is 25 kHz and can be set with P3 on D915.

Proceed as follows:

• Switch POLYMOBIL Plus OFF.

• Remove fuse F6 on D925.

• Connect the oscilloscope to D915 at TP "CAL" and "GND".

• Switch POLYMOBIL Plus ON (Err 03 is blinking).

The oscillogram must appear as shown in Fig. 12.

CH1: D915 test point "CAL"
20 µs /Div

Fig. 12

• Setting the maximum filament inverter frequency with potentiometer P3 on D915.

Siemens AG SPR8-125.061.03 Page 13 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 14 Measurements

,

Measuring the filament nominal value 5

The filament nominal value is set at the factory and should not be changed.

The filament nominal value can be measured on D915 at TP "JRS" and "GND" with the
DVM and is 1.5 V

± 4% in standby.

NOTE

If this value is changed, the nominal values for preparation and
exposure are also affected.

Setting the tube current for the exposure 5

The tube current must be reset for each tube.

Proceed as follows:

• Connect the oscilloscope to D915 at TP "JR", "IH" and "GND".

• Set 60 kV, 10 mAs on POLYMOBIL Plus and release an exposure.

The oscillogram must appear as shown in Fig. 13.

Fig. 13

Actual tube current valueCH1: D915 test point "JR"
Actual fil. current value CH3: D915 test point "IH"

If this is not the case, adjust P5 on D915 until there is minimal current overshoot at the
beginning of the exposure.
The standby heating of the exposure is set via P5 ( ).
Fig. 13 shows the correct setting.
In Fig. 14 the standby heating is set too high.
In Fig. 15 the standby heating is set too low.

POLYMOBIL Plus SPR8-125.061.03 Page 14 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

IH

IH

Measurements 5 - 15

Tek Stop: Single Seq 2.50kS/s

T

T

3

Ch1

1.00 V M20.0ms

Ch3

500mV

Standby heating too high

1.56VCh1

Fig. 14

Standby heating too low

Fig. 15

Siemens AG SPR8-125.061.03 Page 15 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 16 Measurements

Testing and setting the mAs counter 5

• Unscrew the lid of the single tank cover.

• Pull out the mAs jumper on D900 and connect the mAs meter.

• Set 70 kV, 80 mAs on POLYMOBIL Plus and release exposure.

If the value displayed on the mAs meter does not coincide with the value set on
POLYMOBIL Plus, adjust the mAs counter with P1 on D915.

Release another exposure and compare the display.

CAUTION

Overheating of the tube during radiation.

If not observed the tube can be damaged.

Observe the cooling intervals for the tube.

POLYMOBIL Plus SPR8-125.061.03 Page 16 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Measurements 5 - 17

Length

Marker

Side marker

Fig. 16

Coincidence of light and radiation fields 5

NOTE

Procedure:

If the POLYMOBIL is equipped with a DAP measuring system,
remove the DAP ionization chamber first.

• Insert film into the 24 cm x 30 cm or 10” x 12” cassette and place it on a table or similar

surface.

• Adjust the vertical SID of 100 cm or 40” to the top edge of the cassette using a measuring

tape.

• Use the knobs to set a format of 18 cm x 24 cm or 8” x 10”.

• Switch on the light localizer and align the cassette.

• Apply radiopaque markers (e.g. washers, coins) as shown in Fig. 16.

Use one washer as a side marker.

• Release an exposure (60 kV, 10 mAs) and develop the film.

• Log the following data on the developed film using a water-resistant felt-tip pen.

- SID setting

- Film size

- Radiation field size

Siemens AG SPR8-125.061.03 Page 17 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 18 Measurements

Evaluation:

• Measure the deviations (X1, X2, Y1, Y2) between the edges of the light field and the

radiation field on all four sides, corresponding to Fig. 17.

• Calculate the total deviations in the X and Y directions (disregarding the algebraic sign).

Y

1

Film

Light field

Fig. 17

X

2

X

1

Radiation field

Y

2

• The deviations in length (total Y) as well as the deviations in width (total X) must be

smaller than 1.6 cm respectively.

POLYMOBIL Plus SPR8-125.061.03 Page 18 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Measurements 5 - 19

MOB00672

Fig. 18 Fig. 19

• If the deviation is larger, loosen the four Allen screws a little (arrow/Fig. 18/Fig. 19) and

shift the collimator accordingly.
After adjusting the collimator, tighten the screws again (arrow/Fig. 18/Fig. 19).

• Repeat the test and readjust the collimator until the light and radiation fields are within

the acceptable tolerance (< 1.6 cm).

Siemens AG SPR8-125.061.03 Page 19 of 20 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

5 - 20 Measurements

3

4

2

Fig. 20 Fig. 21

1

Testing and readjusting the counterbalance 5

• Loosen the rotating knob (2/Fig. 20) and unlock the C-arm (1/Fig. 20).

It should be possible to move the C-arm without any attached accessories easily across
the whole range and the arm should come to a stop in any desired position.

Readjusting the counterbalance with accessories attached 5

If the C-arm with accessories attached does not come to a stop in any desired position,
readjust the spring tension for the counterbalance.

• Remove the cover (3/Fig. 20) at the stand.

• Release the supplemental brake at the C-arm (2/Fig. 20) completely.

• Move the C-arm into a vertical position.

• Tighten the screw using a 17 mm Allen key (4/Fig. 21).

Adjust the spring tension in such a way that there is a balance when the C-arm is in a
vertical position, i.e. that equal force is required to lift and lower the tube assembly.

POLYMOBIL Plus SPR8-125.061.03 Page 20 of 20 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Replacing important components 6

6 - 1

NOTICE

To repair paint chips, the POLYMOBIL Plus colors
can be ordered in spray cans:

"white" spray paint
"ergo gray" spray paint
"medical blue" spray paint

84 27 734
84 27 742
55 07 046

2

3

1

Fig. 1 Fig. 2

Replacing the single tank generator 6

To replace the single tank generator, remove it from the stand as described below:

• Remove the collimator (see “Replacing the collimator”).

• Move the arm into the lowest position and check whether the safety mechanism (bolt 1 /

Fig. 1) is locked into position.
Now the stand cannot be moved upwards.

• Remove the four Allen screws of the single tank generator cover (2/Fig. 2), remove the

cover, disconnect the connections and the strain relief of the corrugated tubing (3/Fig. 2)
and remove it.

Siemens AG SPR8-125.061.03 Page 1 of 10 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

6 - 2 Replacing important components

4

Fig. 3

• Take out one of the four mounting screws and insert it into the threaded hole and tighten

it (arrow/Fig. 3).

WAR NING

Accurate usage of safety device for the arm of the unit.

If not observed, death or serious physical injury can occur.

This is a safety device (see arrow/Fig.03) to prevent the arm of the
unit from flying upward if the lever for the transport lock is inad­vertently activated.

• Place a pad under the single tank generator.

• Disconnect the single tank generator together with the bracket from the stand by

removing the three remaining screws (4/Fig. 3).

• Lower the single tank generator to the pad.

• The single tank generator is installed in reverse sequence.

- Secure the three mounting screws (4/Fig. 3) with Loctite 242 and tighten them.

- Remove the fourth mounting screw from the threaded hole (arrow/Fig. 3) and reinstall it
in its former position. Secure the screw with Loctite 242.

- Test the torque of the mounting screws;
Nom: 25 Nm, Tolerance

± 10%.

• Reinstall the collimator in reverse sequence.

• Set the tube current (see "Setting the tube current for the exposure", page 5-13).

• Check the coincidence of the light and radiation fields and adjust, if necessary

(see "Coincidence of light and radiation fields", in chapter 5)

POLYMOBIL Plus SPR8-125.061.03 Page 2 of 10 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Replacing important components 6 - 3

5

Fig. 4 Fig. 5

6

Fig. 6

Replacing the collimator 6

In case of damage, the collimator has to be completely replaced.

Proceed as follows:

• Remove the two screws (6/Fig. 6) and remove the back panel.

• Mark the five connecting cables of the collimator and disconnect them.

• Remove two screws on each side (5/Fig. 5) of the upper cover.

• Turn the two knobs to the end position and remove them.

• Remove the front panel after you have removed the two screws (7/Fig. 7).

Caution: The front panel is connected to the collimator via a cable (9/Fig. 8).

Siemens AG SPR8-125.061.03 Page 3 of 10 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

6 - 4 Replacing important components

• Remove the collimator after removing the four Allen screws (arrow /Fig. 4-Fig. 5).

CAUTION

Accurate replacement of the collimator

If not observed, the collimator can be damaged.

Hold the collimator securely.
Lift the upper cover and pull the cable through the housing.

• Attach the new collimator with the four screws (arrow /Fig. 4-Fig. 5) and center it.

• Reconnect the cables and the back panel.

• Check the coincidence of the light and radiation fields and adjust, if required.

(See “Coincidence of light and radiation field”, page 5-16.)

7

9

10

8

Fig. 7 Fig. 8

Replacing the lamp for the localizer 6

• The replacement light localizer lamp is located below the cassette module.

• Turn both knobs (8/Fig. 7) to the end position and remove them.

• Remove the front panel after removing both screws (7/Fig. 7).

Caution: The front panel is connected to the collimator via a cable (9/Fig. 8).

• Remove both screws (10/Fig. 8) and take off the metal bracket for the temperature

switch).

• Take out the defective lamp (11/Fig. 8) and replace it with a new lamp

11

POLYMOBIL Plus SPR8-125.061.03 Page 4 of 10 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Replacing important components 6 - 5

NOTICE

Danger of burn-in by fingerprint.

Do not touch the glass envelope with your fingers.

Use a fluffless cloth during the replacement of the lamp.

• Attach the bracket and the front panel.

• Adjust both knobs and attach them.

• Check the function of the light localizer lamp.

• Check the coincidence of light and radiation fields (see "Coincidence of light and

radiation fields" in chapter 5).

Siemens AG SPR8-125.061.03 Page 5 of 10 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

6 - 6 Replacing important components

Fig. 9

Replacing the steering caster 6

Step:

1 Loosen only Allen screws on the left and right (2.5 mm wrench.

2 Pull back hexagonal shaft

3 Remove pedal

4 Remove Allen screws (wrench size 6 mm).

5 Pull out the caster.

6 Align the threaded holes on the new caster.

• Install in the reverse sequence.

• Test the pedal positions (see Operating Instructions).

POLYMOBIL Plus SPR8-125.061.03 Page 6 of 10 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Replacing important components 6 - 7

4

R

3

R

5

R

1

C

C

C

V

-

+

Fig. 10

Replacing the capacitor bank 6

DANGER

When working on the open system, there is the danger of

Electric shock

!

Contact with current-carrying parts will lead to death or to serious
physical injury.

• The capacitor bank can still be charged.

Do not attempt to work on the system while this condition exists.

• For details see chapter "Prerequisites".

Siemens AG SPR8-125.061.03 Page 7 of 10 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

6 - 8 Replacing important components

2

1

1

2

Fig. 11 Fig. 12

• Switch the unit off; disconnect the line voltage plug;

• Remove the two cover screws on each side (1/Fig. 11) and remove the cover (with

cassette drawer).

• Measure the actual voltage present in the capacitor bank with the DVM at test point -

VCC and +VCC on the inverter board D960 or (more accessible) on the capacitor board
D970 at the + connecting point of the C3 capacitor and on the right-hand side of fuse F3
(see Fig. 12).

4

R

3

R

5

R

1

C

C

C

V

-

+

•

DANGER

Danger of Electric shock

Contact with current-carrying parts will lead to death or to serious
physical injury.

!

• Continue work only if the capacitor unit is discharged (U < 10 V)

• Remove one cover screw on each side (2/Fig. 11).

• Unscrew the three Allen screws (2/Fig. 12).

• Pull out the connectors X3 and X9 (3/Fig. 12) on the charging board D950.

• Remove flat ribbon cable X20 (4/Fig. 12) from the inverter board D960 and from the

charging board D950.

• Disconnect and remove the cables of oscillating circuit capacitor C1 and oscillating

circuit coil L1 to inverter board D960.

• Pull the entire capacitor unit out towards the front.

POLYMOBIL Plus SPR8-125.061.03 Page 8 of 10 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Replacing important components 6 - 9

DANGER

Danger of Electric shock

Contact with current-carrying parts will lead to death or to serious
physical injury.

!

• If a fuse on D970 is defective, high voltage may still be present at

the affected capacitor.

• In this case, discharge the affected capacitor with the

discharging resistor R5 (Fig. 12).

• Assembly is performed in the reverse sequence.

• Check the capacitor voltage (Uc) and the charging time (see "Capacitor voltage (Uc) and

charging time ", page 5-4)

Siemens AG SPR8-125.061.03 Page 9 of 10 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

6 - 10 Replacing important components

This page intentionally left blank.

POLYMOBIL Plus SPR8-125.061.03 Page 10 of 10 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

DAP measuring system (option) 7

Recalibration of DAP measuring system 7

This chapter shows how to recalibrate the DAP measuring system by using an external
ionization chamber (dose meter).

Required equipment 7

• Dose meter

• Calibration tool for DAP measuring system

Recalibration procedure 7

• System OFF.

• Disconnect the DAP ionization chamber connectors (pos. 1 / Fig. 1).

MOB00672

7 - 1

1

Fig. 1 Connector

• Connect the DAP calibration tool between both of the connectors that just were

disconnected.

NOTE

It is irrelevant which connector is the input or the output of the
DAP calibration tool.

• System ON.

• Set up the POLYMOBIL and the dose meter as shown in Fig. 2.

NOTICE

Measurement errors.

If a semiconductor detector is used, the temperature/pressure
factor of the dose meter must be considered.

Otherwise a deviation against the factory calibration may occur.

Siemens AG SPR8-125.061.03 Page 1 of 4 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

7 - 2 DAP measuring system (option)

• Switch the collimator light on. The dose meter should be positioned in the center of the

light field and freely in the air to avoid back scattering radiation.

MOB00676

A

B

length

width

Fig. 2 Setup

• Measure the Focus - dose meter distance (A / Fig. 2) and then the width and the length

of the light field on the surface. For optimal accuracy, place an unexposed film cassette
on the surface, and measure the exposed area width and length on the film after an
exposure has been released.

• Measure the Focus-light field/surface distance (B / Fig. 2).

• Calculate the reference area according to the following formula:

2

Reference area

A

------

width length⋅() unit m

2

B

()⋅=

2

• Set kV to 102 and mAs to 20 and release an exposure.

• Record the dose value measured with the dose meter.

POLYMOBIL Plus SPR8-125.061.03 Page 2 of 4 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

DAP measuring system (option) 7 - 3

• Calculate the reference DAP value using the measured dose value according to the

following formula:

Reference DAP value measured dose value reference area unit µGy m

()⋅=

2

• Record the DAP value measured with the DAP measuring system (DAP value from

display).

• Calculate a comparison with the following formula:

⋅

100 DAP value from display

Comparison value (%)

The comparison value shows the deviation between the actual DAP value (measured
with the dose meter) and the DAP value measured with the DAP measuring system. If
the comparison value is negative, the DAP display shows a value that is lower than the
actual value, and vice versa.

If the comparison value is less than ±5%, the calibration is completed.

------------------------- --------------------------------------- -------------100–=
Calculated DAP value

• To correct the deviation, press the “UP” button on the calibration tool (for negative

comparison values) or the “Down” button (for positive comparison values). Pressing a
button once corresponds to approximately 0.5 % change of the comparison value.

NOTE

The middle push-button on the DAP calibration tool is for test
purposes. It has the same function as the test button on the DAP
display.

• Repeat the calibration sequence until the deviation is less than ±5 %.

• System OFF.

• Remove the DAP calibration tool and reconnect the DAP ionization chamber as shown in

(pos. 1 / Fig. 1).

• System ON.

• Press the reset and the test button to finish the calibration procedure.

• Release a test exposure.

Miscellaneous service issues 7

No further service or maintenance shall be performed on the DAP ionization chamber and
the DAP display. Note that the warranty will become void if the DAP ionization chamber or
the DAP display are opened or altered in any fashion.

Siemens AG SPR8-125.061.03 Page 3 of 4 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

7 - 4 DAP measuring system (option)

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POLYMOBIL Plus SPR8-125.061.03 Page 4 of 4 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions

Changes to previous version 8

Chapter 1

Page 1 -2: Section "Tools, measurement and auxiliary devices required"

completely revised.

Revision of the warning symbols.

Chapters 2 and 5

Revision of the warning symbols.

Chapter 6

Page 6 -1: Part No. for spray paint "medical blue" added.

Revision of the warning symbols.

Chapter 7: completely revised.

8 - 1

Siemens AG SPR8-125.061.03 Page 1 of 2 POLYMOBIL Plus
Medical Solutions Rev. 02 08.03 CS PS 24

8 - 2 Changes to previous version

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POLYMOBIL Plus SPR8-125.061.03 Page 2 of 2 Siemens AG
Rev. 02 08.03 CS PS 24 Medical Solutions