Physiomed PHYSIOMED-Expert 2 User manual

SERVICE MANUAL
PHYSIOMED-Expert 2
PHYSIOMED–IF–Expert
2
Revision: 09 / 2008
Valid from Instrument No.: PME 2 - 0300211
And PIE 2 - xx001xx 17900

Table of Contents
1TECHNICAL DATA.................................................................................................3
2HOUSING CONSTRUCTION...................................................................................4
3GENERAL NOTES ..................................................................................................4
4NOTE .....................................................................................................................4
5ADDITIONAL EQUIPMENT REQUIRED..................................................................4
6TEST MENU ...........................................................................................................5
6.1 Test Menu Stimulation Current ................................................................................................5
7BALANCING PROCEDURE .....................................................................................6
7.1 Setting up ...................................................................................................................................6
7.2 Checking the Power Supply; PC Board No. 9902-2..................................................................7
7.2.1 Not Stabilized.......................................................................................................................7
7.2.2 Stabilized .............................................................................................................................7
7.3 Balancing PC-Board No.: 9902-2 (Stimulation Current)...........................................................7
7.3.1 Balancing I: Offset Set Up of Output Transformer.................................................................7
7.3.2 Balancing II: Offset Set Up of Pulse Generation ....................................................................7
7.3.3 Adjustment of Output Current .............................................................................................8
8CHECKING THE INSTRUMENT ..............................................................................9
8.1 Checking Connection.................................................................................................................9
8.2 Checking Display and Display Elements ..................................................................................9
8.3 Checking the Therapy Timer ...................................................................................................10
8.4 Checking the Current Types....................................................................................................10
8.5 Checking Function of the Selection Fields .............................................................................10
8.6 Display Wire of Air Gap and Leakage Distance.....................................................................10
9ERROR CODES.....................................................................................................11
9.1 Important Service Note ...........................................................................................................12

Technical Data
1Technical Data
Protection class I acc. To VDE 0750 / IEC 601
Typ: BF
CE characterization acc. to Council Directive concerning medical devices
(93/42 EEC)
Class acc. EEC 93/42 IIa
Power supply 230 VAC ± 10% or 115 VAC ± 10%
Note Settings indicated at the mains module!
Power line frequency 50 … 60 Hz
Current consumption 0.3 A (at 230 V) or 0.6 A (at 115 V)
Power consumption 68 VA
Line fuses at 230 V: T 1 A
at 115 V: T 2 A
Output data
STIMULATION
75 mAs (maximum) at 500 Ohm
Ambient temperature + 10°C ... + 40°C
Dimensions
(W x H x D)
34.5 x 13.3 x 34.8 cm
Weight 5.1 kg
PHYSIOMED-Expert 2 - Service Manual 3

Housing Construction
2Housing Construction
PHYSIOMED-Expert 2/ PHYSIOMED-IF-Expert 2is a single shell construction in a plastic
housing.
Always disconnect the power lead before opening the instrument.
3General Notes
PHYSIOMED-Expert 2/ PHYSIOMED-IF-Expert 2is a two-channel stimulation current therapy
unit. You can apply the whole range of current modes from low- to medium-frequency
including the classic interferential current. The instrument also offers you programs for
diagnosis by stimulation current. The unit can also be used for simultaneous therapy
(stimulation current and ultrasound in ONE treatment if you combine it with a suitable
ultrasound therapy unit (e.g. PHYSIOSON-Expert).
4Note
The structure of the following service instructions allows you to do a basic balancing.
As a rule, for later balancing (e.g. repair), only parts of the balancing procedure are
necessary, which can all be adjusted by the trimming potentiometer (provided that
grave errors concerning the balancing procedure are not apparent or have been
cleared).
5Additional Equipment Required
State of calibration *
Oscilloscope (with probe) B
Digital multimeter AC and DC B
Frequency meter B
* State of calibration B = precision 5%
The following documents provide information necessary for the balancing
procedure, such as positions of the trimmers or test points:
•Wiring Scheme
•Parts List
•Operating Instructions
4 PHYSIOMED-Expert 2 - Service Manual

Test Menu
6Test Menu
The test menu is used to select and display service relevant parameters of the
instrument. In order to get into the test menu you have to set short-circuit plug JP2 at
Pc board 9902-2 on position 1+2 and then turn on the instrument.
6.1 Test Menu Stimulation Current
Display Circuit: Set Value I
Selection Channel 1
Selection Channel 2
Value measured output I
Value measured output U
PHYSIOMED-Expert 2 - Service Manual 5

Balancing Procedure
You will find a similar layout of the display for circuit II (ch2). By using the following
overview table you can get information for possible adjustable parameters and displays:
Selection Field Circuit I Available Options
( ) + Positive signal / Negative signal
( ) CH1 NF NF/ MF / MC basic signals
( ) monph Monophasic signal / Biphasic signal
( ) kb_trap1 Signal waveform
( ) T Impulse duration of the signal
( ) R Pause duration of the signal
Selection Field Circuit II Available Options
( ) + Positive signal / Negative signal
( ) monph (unused; CH1 also switches CH2)
( ) CH2 f0f0 / AMF / NF / NF_HV / NF_2 basic signals
( ) f0 4 KHz Adjusting of basic frequency
( ) Δ f 100Hz Adjusting of modulation frequency
Lower Selection Field Available Options
( ) DA1_255 Adjust circuit I by means of the DA converter
( ) DA2_255 Adjust circuit II by means of the DA converter
[ ] EEPRCL EPROM clear (e.g. clearing all individual programs)
[ ] CV1_ON Activate constant voltage
[ ] CV2_ON Activate constant voltage
[ ] R_ext Switch signal to external lead resistor
[ ] Amp2_ON Activate output transistor in circuit 2
[ ] Pl ÙVak Switching between plate electrodes – vacuum
electrodes
[ ] US-TestMen Selection of the ultrasound test menu (unused)
[ ] Test END Exit test menu
7Balancing Procedure
7.1 Setting up
•Check line fuses; refer to technical data and reference labels.
•Check fuses F1-F4 of secondary circuit; refer to parts list of power supply and to
reference labels.
•Connect power cord
6 PHYSIOMED-Expert 2 - Service Manual

Balancing Procedure
7.2 Checking the Power Supply; PC Board No. 9902-2
7.2.1 Not Stabilized
Measure +7.8 V at TP5Nominal Value: +6.6 V...+9.0 V
Measure voltage towards GND at TP6.
Measure +34 V at TP4Nominal Value: +30 V…+38 V
Measure voltage towards –15 V at TP3.
Measure +125 V at R119 Nominal Value: +110 V ... +140 V
Measure – 125 V at R114 Nominal Value: - 110 V ... – 140 V
Measure voltage towards GND at TP10.
7.2.2 Stabilized
Measure + 5 V at TP1, Nominal Value: + 4.9 V...+ 5.2 V
Measure +15 V at TP2, Nominal Value: +14.8 V...+15.2 V
Measure – 15 V at TP3,Nominal Value: -14.8 V...- 15.2 V
Measure voltage towards GND at TP10.
7.3 Balancing PC-Board No.: 9902-2 (Stimulation Current)
7.3.1 Balancing I: Offset Set Up of Output Transformer
Preparation:
•JP2 to position 1+2 : (Test Mode)
•Turn intensity to zero
•Adjust earth connection of the oscilloscope at TP10 (GND)
•Switch on the instrument
•Measure offset-voltage at housing of V33
•Do following adjustments in the stimulation current test menu
•kb_trap1 adjust signal waveform
•R_ext select external resistance
Adjust offset-voltage to zero by using pad-trimmer R104
When selecting CV1_ON in the stimulation current test menu, the offset voltage
should not change. If it does, use pad-trimmer R104 to adjust.
7.3.2 Balancing II: Offset Set Up of Pulse Generation
Preparation:
•CV1_ON not activated
•Turn intensity to maximum
•Adjust earth connection of the oscilloscope at TP10 (0 V)
•Measure offset-voltage at housing of V33
Adjust offset-voltage to zero by using pad trimmer R53
PHYSIOMED-Expert 2 - Service Manual 7

Balancing Procedure
7.3.3 Adjustment of Output Current
Preparation :
•CV1_ON : not activated
•kb_trap1 : adjust signal waveform
•R_ext . external resistance activated
Plug in the external test resistance R = 500 Ohm
Channel 1:
Setting up low frequency output current
CH 1 NF is set in the menu channel 1
Turn intensity to maximum
The low frequency output current of circuit 1 is to be adjusted by trimmer R60
The value appearing to the right of the intensity display in circuit 1 must be 74 … 75
mA. The maximum value of the measured current must be between
US,min = 33.8 V and US,max = 37.5 V.
Channel 2:
Setting up interference output current
CH 2 fo is set in the menu channel 2
Turn intensity to maximum
The Interference output current of circuit 2 is to be adjusted by trimmer R72.
The value appearing to right of the intensity display in circuit 2 must be 74 … 75 mA
The maximum value of the measured current must be between
US,min =33.8 V and US,max =37.5 V.
Setting up low frequency output current
CH 2 NF is set in the menu channel 2
Turn intensity to maximum
The low frequency output current of circuit 2 is to be adjusted by trimmer R252.
The value appearing to right of the intensity display in circuit 2 must be 74 … 75 mA
The maximum value of the measured current must be between
US,min =33.8 V and US,max =37.5 V.
The value appearing right to intensity-display in circuit 2 has to be 74 … 75mA
Maximum value of the measured currency has to be between US,min = 33,8V and US,max
= 37,5V
Setting up frequency of special current modes (e.g. KOTS)
CH 2 NF_2 is set in the menu channel 2
Turn intensity to maximum
The special current mode of circuit 2 is to be adjusted by trimmer R251.
The value appearing to the right of the intensity display in circuit 2 must be 67 mA
To return to regular operation mode, set JP2 to position 2+3.
8 PHYSIOMED-Expert 2 - Service Manual

Checking the Instrument
Instrument self-test:
(in the selection stimulation current test menu)
Select the [ ] Test END
The instrument will carry out an automatic self-test routine
9902-2
CH1 NF/ IF R 60
CH2 NF R252
CH2 NF2 R 251 ( +40/-40 )
CH2 f0 R 72
Tolerance of selftest values
Stimulation current
mA:
10 + 2 50 +5 70 +5 80 78 - 85
The values displayed here are important assessment criteria for our service department.
The assessment of the parameters enables us to make a diagnosis of the technical state
of the device.
If the measured values are not within tolerance, the automatic self-test is interrupted
and an error code is displayed. It can be restarted by pressing the selection-button. If
settings are done, the self-test routine will end with the message:
CH1+CH2 HWT OK
To return to THERAPY MODE, set JP2 back to position 2 + 3.
8Checking the Instrument
8.1 Checking Connection
Check the whether line voltage of the device (see “red window“ in the mains module)
and the rated voltage correspond.
8.2 Checking Display and Display Elements
Turn both intensity controls to 0.
Switch off the device and switch it on after 5 sec.
The instrument will carry out an automatic self-test routine.
•Display is tested
•All functions and output values of the stimulation current unit are checked
•Pulse indicators are illuminated
•Patient current and output indicators are illuminated
•An acoustic signal is audible
Either the start menu or the display of the last selected current type appears.
PHYSIOMED-Expert 2 - Service Manual 9

Checking the Instrument
8.3 Checking the Therapy Timer
•Connect oscilloscope to the output
•Select any current type
By using the Therapy timer you can adjust time from 0-30 min in 1 min. intervals.
•Adjust a therapy time of 30:00 min.
•Turn on intensity
Timer is started, therapy time decreases.
Turn therapy time to 0.
An acoustic signal is audible, intensity is decreasing and Intens Åappears in the lower
status line.
8.4 Checking the Current Types
Connect oscilloscope to output.
Check all current types, pulse and rest times according to operating instructions.
8.5 Checking Function of the Selection Fields
Check all selection fields according to operating instructions.
8.6 Display Wire of Air Gap and Leakage Distance
Check air gap and leakage distance (2.5 mm / 4 mm); you should also pay attention
to the position of the display wire.
10 PHYSIOMED-Expert 2 - Service Manual