GymnaUniphy Phyaction 190, Phyaction 190i User manual

SERVICE INFORMATION PHYACTION 190 / 190i

Phyaction is manufactured in The Netherlands by Uniphy BV P.O.Box 558 , NL-5600 AN Eindhoven, the Netherlands Tel. +31 499 491800 Fax. +31 499 474734

Table of contents

CHAPTER 1 GENERAL INFORMATION......................................................................... 1

1.1 Introduction ................................................................................................................................ 1

1.2 Safety aspects ............................................................................................................................ 1

1.3 Installation .................................................................................................................................. 2

1.4 Description of the controls ....................................................................................................... 2

1.5 Technical specifications............................................................................................................ 4

CHAPTER 2 THEORY OF OPERATION.......................................................................... 5

2.1 Introduction ................................................................................................................................ 5

2.2 General block diagram .............................................................................................................. 5

2.3 Ultrasound unit........................................................................................................................... 6

CHAPTER 3 PERFORMANCE CHECK............................................................................ 9

3.1 Safety inspection ....................................................................................................................... 9

3.2 IEC 601-1 safety tests ............................................................................................................... 10

3.3 Performance check of the ultrasound treatment heads ....................................................... 10

CHAPTER 4 TROUBLE SHOOTING ................................................................................. 12

4.1 Introduction ............................................................................................................................... 12

4.2 Description of the automatic selftest...................................................................................... 12

4.3 Description of the service software ........................................................................................ 15

4.4 Error messages ......................................................................................................................... 16

CHAPTER 5 EXCHANGING BOARDS AND MODULES .................................. 17

5.1 Introduction ............................................................................................................................... 17

5.2 Exchanging the software or the main board (PCB 192X) ..................................................... 17

5.3 Exchanging the ultrasound module........................................................................................ 17

5.4 Exchanging the LCD ................................................................................................................. 18

5.5 Exchanging the keyboard PCB (194X).................................................................................... 18

APPENDIX 1 CIRCUIT DIAGRAMS

APPENDIX 2 TUNING THE ULTRASOUND TREATMENT HEADS

APPENDIX 3 ERROR LIST

Table of contents - Service information Phyaction 190 / 190i

CHAPTER 1 GENERAL INFORMATION

1.1 Introduction

The Phyaction 190 is an appliance for ultrasound therapy and it can be used for combination therapy with an external electrotherapy appliance.

In this chapter the important features from the users manual for service personnel are listed. In the next chapter the theory of operation will be explained. In chapter 3 is described how service personnel can check the operation of the Phyaction 190 and what maintenance operations should be carried out. The next chapter contains information which could be very useful for trouble shooting such as a description of the automatic self test and a list of the error numbers. The operations that have to be carried out if you want to exchange a printed circuit board or another module are described in chapter 5.

1.2 Safety aspects

1.2.1 Electrical safety

The equipment can only be used in areas with provisions in accordance with current statutory requirements. Pay particular attention to the use of protective earth, otherwise the patient leakage current can rise above the permitted limit for type BF equipment.

1.2.2 Explosion safety The equipment is not suitable for use in areas where flammable gasses or vapours are present. Therefore, remove the mains plug from the socket before the area in which the equipment is located is disinfected, since some disinfection solutions evaporate and subsequently form an explosive mixture.

1.2.3 Operational safety

- Using the equipment in the vicinity of short wave or microwave equipment can influence the correct operation of the unit. Using this equipment when high frequency surgical equipment is connected to the patient at the same time can result in burning under the electrodes when using it for combination therapy.

- Patients who have electrical implants (i.e. pacemaker) may only be treated following medical advice.

- The equipment is not suitable for use in damp areas.

- The equipment may not be disinfected or sterilized.

- Whenever the equipment is switched on (using the main switch) the microprocessor checks the entire system for correct operation.

- The ultrasound heads, including the cable and the connectors should be checked regularly. In particular attention should be paid to damage to the ultrasound heads through which liquids can enter the ultrasound heads.

- The ultrasound heads should be handled carefully, because the properties of the ultrasound heads can alter due to rough handling.

1.2.4 Use of the appliance

The equipment and accessories should only be used by authorized personnel and in accordance with all instructions included in these operating instructions. The Phyaction 190 is only to be used for providing ultrasound therapy. When connected to an electrotherapy appliance the Phyaction 190 can be used to provide combination therapy.

1.2.5 Radio interference suppression and electromagnetic compatibility

This equipment meets the guidelines for ISM equipment relating to electromagnetic compatibility and is radio interference suppressed according to EN55011. Also see section 1.2.3 Operational safety of this chapter, concerning the use of the equipment in the vicinity of short wave and microwave equipment.

1. GENERAL INFORMATION Service information Phyaction 190 / 190i - Page 1

1.3 Installation

1.3.1 Incoming inspection

Check that the equipment and ultrasound head(s) have not been damaged during transportation and that the accessories are intact and complete (see chapter 14 ACCESSORIES of the INSTRUCTIONS FOR USE). In the event of damage and/or defect you should inform your supplier.

1.3.2 Mains voltage

Your equipment is suitable for a nominal voltage of 110, 220, 230 or 240 Volt AC, 50-60 Hz. Indicated on the rear of the equipment will be the voltage for which it has been wired. You can not alter this yourself. Carefully check this data before you place the mains plug in the socket. The mains input is on the back of the appliance at the bottom.

1.3.3 Functional test

During production the equipment is tested for electrical safety. Whenever the equipment is switched on, the processor performs an extensive test to ensure that the equipment is operating correctly. In addition you must check whether the display and the indicator lamps are operating correctly. The green lamp indicates that the appliance is connected to the mains supply and that the appliance is switched on. The red lamp illuminates when the safety system has detected a fault which prevents the appliance being used. If the appliance is not operating correctly, then you must not use the equipment and you must contact your supplier. If you can not read or if it is difficult to read the display, then press the right hand blue button and the black ¿ button in order to darken the text or the black À button if you want to make the text lighter.

1.3.4 Location and transportation

The equipment must be set up horizontally and stable. You should ensure that the vents in the housing are not blocked so that circulation of air is not hindered. Objects must not be placed on the equipment and you must ensure that no liquid enters the equipment.

1.3.5 Fitting the head holder

As standard, a head holder is supplied with each treatment head. Before you use the Phyaction 190 for the first time, we advise you to fix the head holder(s) to the appliance. The ultrasound treatment head can be connected to the appliance easily and in a user-friendly manner into the head holder. At the same time this protects the treatment head against damage by, for example, falling. For a description of fixing the head holder to the appliance please refer to the drawing which you will find in the packing for the head holder.

1.3.6 Checking the ultrasound heads

You can check which head belongs to which appliance by pressing the yellow button for 3 seconds. In the middle of the screen which then appears, you will see the treatment head symbol with a statement of the ERA on which treatment head(s) the appliance has been tuned. After this symbol there are 20 figures. If these figures correspond exactly with the figures on the treatment head label then this treatment head belongs to that appliance. If they do not correspond, you are using a treatment head which does not belong to that appliance. If the middle screen is completely empty then the appliance has not been tuned to any treatment head and we advise you to inform your supplier.

1.4 Description of the controls

On the last page of this operating instruction you will find an illustration of the equipment and the accessories.

1.4.1 Display

The display

consists of separate picture elements which are controlled by a processor so that you can see text

and figures. When you are performing a treatment, the display shows all of the information you require:

- The top left section provides information about the parameters which have been set.

- The right section provides information about the output power and the degree of contact of the treatment head. This section also gives information about the treatment time.

- The bottom line of the display shows the functions of the blue buttons.

1. GENERAL INFORMATION Service information Phyaction 190 / 190i - Page 2

Lay-out of the therapy screen

1.4.2 Signal lamps

On the front, to the right of the display, there are two coloured lamps:

- The green lamp switched on.

- The red lamp

indicates that the appliance is connected to the mains supply and that the appliance is

illuminates when the safety system has detected a fault which prevents the appliance being used. A message appears on the display. See chapter 4 TROUBLE SHOOTING. The red lamp also illuminates during the self test which is performed after switching on the appliance.

The yellow lamps

, beside the output connectors of the ultrasound head, illuminate for 2 seconds as soon as the relevant ultrasound head has been selected. A yellow lamp also illuminates beside an output connector as soon as ultrasound power is emitted.

1.4.3 Rotary knob On the right-hand side at the front there is a large rotary knob

with which the intensity peak in Watt/cm2 can be

adjusted. When you rotate this knob fully anti-clockwise you will feel a click and it is in the zero position.

1.4.4 Push buttons

- Using the blue buttons

- The black buttons ¿ or À

already selected.

- The yellow button

a parameter can be selected. This display clearly shows the function of the buttons.

are used to increase or decrease the value of a parameter which you have

is used to return to the therapy screen. When the yellow button is depressed for 3 seconds, a screen appears in which the software version number, the release date of the software and the treatment head parameters can be read.

- Using the green button

you can access the special memory function. 20 different treatments can be saved,

retrieved or changed.

1.4.5 Output connectors and sockets on the front

- The safety socket metallic treatment surface of the ultrasound head forms the other electrode.

- The ultrasound head(s) are connected to the two connectors

on the far left is used for connecting the electrode cable during combination therapy. The

on the right. It makes no difference which head(s) you connect to which connector. Two treatment heads can be connected at the same time provided they do not have the same format.

1.4.6 Controls on the bottom at the rear of the appliance The following controls can be found on the rear of the appliance:

- The mains input with mains switch

- The fuse holder

is located between the mains input and the mains switch. The rating of the fuse to be used

is stated on the rear of the appliance.

- The connector for connecting to the potential equalization busbar

1.4.7 Label on the rear of the appliance The label containing the appliance data

is located on the rear of the appliance.

1.4.8 Ultrasound treatment heads You have the choice of two ultrasound treatment heads or 4 cm

. The treatment heads can be easily located in the multi-functional head holder17. With each treatment

with an ERA (Effective Radiating Area) of either 1 cm2

head both 1 MHz and 3 MHz ultrasound can be applied. Both treatment heads can be connected to the appliance at the same time. Using the blue button you can select which you want to use.

The display indicates which format of treatment head has been selected at that moment. As soon as the Phyaction 190 is switched on using the mains switch or from the stand-by position, or as soon as a treatment

1. GENERAL INFORMATION Service information Phyaction 190 / 190i - Page 3

head has been selected, the yellow lamp beside the selected head illuminates for 2 seconds on the appliance. Furthermore, each treatment head has a colour indication at two positions: the 4 cm and the 1 cm

is yellow.

treatment head is green

When the surface of the treatment head makes insufficient contact with the patient this is shown on the screen. The ultrasound power is then automatically turned down so that overheating of the treatment head and subsequent wear is reduced. The treatment time also stops when there is insufficient contact and this starts again as soon as contact is re-established. In this way the set time is actually utilized. The appliance should always be tuned to the associated treatment heads. For every new appliance the heads are already tuned to the appliance. However, when a new (another) treatment head is purchased, the appliance should be tuned to the new head. When you press the yellow button for 3 seconds, a screen appears in which you can check whether you are using the correct treatment heads with the appliance. In Appendix 2 TUNING THE ULTRASOUND TREATMENT HEADS, the tuning process is described.

1.4.9 Head holder For each Phyaction 190 a head holder for each treatment head is supplied as standard. You can fit this to the appliance easily yourself. For a description of fixing the head holder to the appliance please refer to the drawing which is enclosed in the packing for the head holder.

1.5 Technical specifications

1.5.1 Specifications Phyaction 190

Duty-cycle: continuous 1:1 pulsating 1:2, 1:4, 1:8, 1:16 Treatment clock: adjustable 0-30 minutes, linked to contact control Intensity: 0 - 1.5 W/cm 0 - 2 W/cm 0 - 3 W/cm Read-out: intensity in W/cm

at 3.3 MHz continuous

at 0.8 MHz continuous

at 0.8 and 3.3 MHz pulsating

effective output power in W Pulse repetition frequency: 100 Hz Memory: 20 memory places available Combination therapy: possibility to connect an electrotherapy appliance

1.5.2 Specifications treatment heads ERA: 1 cm

(model 91) and 4 cm2 (model 92) Frequencies: 0.8 MHz and 3.3 MHz BNR: < 5 at 0.8 MHz < 4 at 3.3 MHz The treatment heads are watertight according to IEC 601-2-5.

1.5.3 Technical information Dimensions: 38 x 22 x 15 cm Weight: 5 kg Insulation class: I, type BF Voltage: 110, 220, 230 or 240 Volt, 50-60 Hz Input current: maximum 300 mA

at 220 V and 600 mA

eff

at 110 V

eff

1.5.4 Replaceable parts Fuses in the mains entrance.

1. GENERAL INFORMATION Service information Phyaction 190 / 190i - Page 4

CHAPTER 2 THEORY OF OPERATION

2.1 Introduction

In this chapter the electronics of the Phyaction 190 will be explained. A description on the level of functional block diagrams will be used. The electronics will be described in more depth when safety aspects are concerned. The Phyaction 190 is a device for ultrasound therapy. The user -the physical therapist- can set a number of parameters. The parameters are converted in electric signals for the ultrasound unit by a microcontroller. Also the microcontroller continuously checks whether the ultrasound unit produces the proper amount of ultrasound energy.

2.2 General block diagram The block diagram of the Phyaction 190 is shown in figure 2.1. The microcontroller core, shown in the middle of the diagram, controls the complete apparatus. The user can set most of the parameters with the keyboard, which is shown at the left of the microcontroller. The intensity of the ultrasound can be set with the intensity knob, drawn to the right of the microcontroller. The actual parameters and the amount of ultrasound energy actually being administered to the patient is shown on the graphical display.

Figure 2.1, Functional block diagram of the Phyaction 190

The ultrasound unit, drawn under the microcontroller, generates the electrical signal the US-head converts into ultrasonic vibrations. The 4 mm banana safety socket, drawn close to the ultrasound unit, allows the user to apply combination therapy when an electrotherapy device is connected to this bus.

2.2.1 The microcontroller core The microcontroller used in the Phyaction 190 is an 80C552. The 80C552 is an MCS-51 type controller (8051) with a number of extra features on the chip:

- 256 byte RAM memory (instead of 128 byte in 8051)

- 3 timer / counters (2 in 8051)

- eight channel 10-bit AD converter (N.A. in 8051)

2. THEORY OF OPERATION Service information Phyaction 190 / 190i - Page 5

- 5 eight-bit wide I/O ports (4 in 8051)

- 2 eight-bit pulse width modulators (PWM) (N.A. in 8051)

- I

C bus for serial data transfer (N.A. in 8051)

- UART for serial data transfer (e.g. RS232)

- watchdog timer (N.A. in 8051)

Next to the microcontroller the following parts are present in the core:

- 8 kByte (expandable to 32 kByte) RAM data memory

- 1 Mbit EPROM program and constant data memory

- 256 byte I

C E2PROM non-volatile data memory

- 2 HCMOS IC's for decoding and buffering purposes

2.2.2 Keyboard The keyboard is a matrix of 10 push buttons connected to the microcontroller via an I

C I/O expander. The microcontroller software defines the function of each key. The user can use the keyboard to set and change a number of parameters (such as the active treatment head, treatment frequency, duty-cycle, treatment time etc.)

2.2.3 Graphical user interface A 240 x 64 dots LCD display with CFT backlight is used as graphical user interface. On it the user can see the current function of the function keys, the parameters, the remaining treatment time, the selected intensity and the resulting effective energy being radiated by the treatment head. Further the contact ration between treatment head and patient is shown on the display.

2.2.4 Safety socket The 4 mm banana safety socket is directly connected to the tin can of the ultrasound unit. This Tin can is the 'ground' of the circuitry, which is also connected to the metal front of the treatment heads. This socket can be used for combination therapy with external electrotherapy appliances.

2.2.5 Serial interface No serial interface is available to the user. Only with an opened apparatus the serial interface can be used for testing purposes. This interface is a 5V-level RS232 interface (a direct connection to the UART of the microcontroller). The interface is for extended service features (used by manufacturer only).

2.2.6 Power supply The power supply is a conventional one with a mains transformer suited for medical purposes. It is equipped with the required primary and secondary fuses, two bridge rectifiers and two capacitors. The unstabilised +29 V is used to feed the ultrasound unit. In the ultrasound unit the +29 V is further used to create a controlled ultrasound supply and two stabilized supplies of +24 V and +15 V. The unstabilised +9 V is used to create a microcontroller controlled switchable +8 V for the LCD contrast and its backlight and to create a +5 V for the logic components. A reset signal for the microcontroller and LCD is generated when the +5 V comes in or when it drops below a certain voltage.

2.3 Ultrasound unit The functional block diagram of the ultrasound unit is shown in figure 2.2. Since the signals to generate ultrasound are made using a square wave of about 1 MHz or 3 MHz, it is necessary to encapsulate the complete ultrasound unit, including the ultrasound crystal, in a metal case (a Faraday cage). In figure 2.2 the metal case is indicated by the dashed line. The electronics is put into a 'tin can'. It will be clear that the ultrasound treatment head cannot be put in the tin can, so to maintain the shielding the crystal is put in an aluminium cup, while the signal wire from the electronics to the crystal is a double braided coaxial cable (double shielded).

The keyboard is used to set the various parameters, such as duty-cycle, treatment time and frequency (1 MHz or 3 MHz). The microcontroller computes the operating frequency of the crystal, using a couple of treatment head parameters fed to the apparatus at installation time. The same head parameters are also used to calculate the administered amount of ultrasound energy and the rate of contact between treatment surface and patient. Keeping track of the treatment time is also done by the microcontroller.

2. THEORY OF OPERATION Service information Phyaction 190 / 190i - Page 6

Figure 2.2, Functional block diagram of the ultrasound unit

Countdown of the treatment time is stopped when the microcontroller notes that there is no or not enough contact between treatment head and patient. The intensity of the ultrasound can be adjusted by the user using the intensity knob. Depending on the voltage Vpotus the microcontroller computes and sets the required voltage Vus with the controlling voltage VSetUs in order to generate the desired amount of ultrasound.

2.3.1 PLL The required ultrasound frequency Fus of 0.8 MHz or 3.3 MHz cannot be generated by the microcontroller itself. For this reason a phase locked loop (PLL) is used to transform a low-frequent signal RefClock, that the microcontroller can generate, up to the desired steering frequency of 2XFus. The modulator divides this double frequency and mixes it with the desired duty-cycle. The frequency generated by the microcontroller is always around 400 Hz. In order to obtain ultrasonic frequencies of both 0.8 MHz and 3.3 MHz a programmable divider is used in the PLL. Whenever the PLL is out of lock (e.g. when changing the frequency for contact control calculations) the Lock-error signal is used to stop the modulator in order to prevent erroneous frequencies being produced by the treatment head.

2.3.2 Modulator To obtain a symmetrical steering signal for the power stage the modulator switches its outputs with half the input frequency. Also the modulator mixes the duty-cycle signal synchronously with the ultrasound frequency to prevent spikes. An amplitude modulation with 100% modulation depth (the signal being switched on and off) is the result of this mixing. With the Lock-error signal the modulator can be forced to shutdown. This action can be taken by the PLL when it is out of lock or by the microcontroller. The Lock-error line can be used as an input as well as an output by the microcontroller.

2.3.3 Voltage controller A pulse controlled downward converter voltage controller is used to convert the unstabilized +29V to the desired ultrasound voltage. The voltage controller is made in such a way that its output voltage is linear proportional to its input voltage VSetUs. Thus the microcontroller can adjust the ultrasonic power by setting VSetUs proportional to the square root of the desired output power. The microcontroller constantly monitors the output voltage of the voltage controller. If the output voltage is too high (because of a hardware failure), the microcontroller will shut down the ultrasound unit and give an error message.

2. THEORY OF OPERATION Service information Phyaction 190 / 190i - Page 7

2.3.4 Power stage The power stage is a switched balance class-D end stage. The generated output power is controlled by Vus, generated by the voltage controller. The above mentioned modulator controls whether the power stage is active. Power MOSFETs are used as switching elements. The MOSFETs are driven by buffers that also take care of a small delay in driving the MOSFETs, to prevent them of being active simultaneously. If either one of the MOSFETs has become defective, both of them should be replaced. In that case the adjustment of the delays in the FET-drivers should be carried out. This adjustment cannot be executed in the field, it has to be carried out only by Uniphy personnel.

2.3.5 Impedance matching The ultrasound crystal is mainly a capacitive load. Its impedance differs, among other things, with the size of the crystal and its operating frequency. For this reason the microcontroller can match the impedance by switching one or two inductors and when necessary capacitors in the output stage.

2.3.6 US head The ultrasound treatment head is of course a very important part of the apparatus. It converts the electric signal into ultrasound using a piezo crystal. This crystal, with a diameter depending on the desired head size, is glued in an aluminium cup that minimizes electromagnetic radiation and enables the crystal to be used on to operating frequencies. The aluminium cup can also be used as a second electrode if combination therapy is desired. A separate electrotherapy device needs to be connected to the safety socket for combination therapy. A resistor is in the connector of the treatment head to enable the microcontroller to detect whether a head is connected and to recognize the type of head that is connected.

2. THEORY OF OPERATION Service information Phyaction 190 / 190i - Page 8

CHAPTER 3 PERFORMANCE CHECK

3.1 Safety inspection

This inspection is for technical maintenance purposes only. It is recommended that this test is carried out once a year. If the appliance is serviced, the full IEC 601-1 tests have to be carried out. A short description of these tests is in section 3.2.

3.1.1 Visual inspection

Passed, when all applicable items are answered with YES.

Is the user manual there?

Is the casing of the appliance undamaged?

Is the label well readable?

Are the controls, display, lights and connectors all right?

Are the mains input and the equipotentiality busbar all right?

yes no

Are ultrasound treatment heads, cables and connectors undamaged? (Pay special attention to possible leaks in the treatment heads, such as cracks or loosened seems.)

Are the labels on the ultrasound treatment heads readable?

3.1.2 Functional test

Passed, when all applicable items are answered with YES (or not applicable).

yes no

Is the automatic selftest executed successfully at power on?

Is the appliance adjusted to all treatment heads? 1 cm²

4 cm²

Does the ultrasound output correspond with the power displayed on the 1 cm²

LCD, for both frequencies at maximum intensity? 4 cm²

3.1.3 Test of the electrical safety according to VDE 0751

Parameter Measured value Limit Remarks

Protective earth resistance

Ω

< 0.2 Ω

Enclosure leakage current

Patient leakage current

µA < 1000 µA

µA < 5000 µA

Also register the measured values in the device records and compare them with the values measured in the past to alert for a possible potentially dangerous tendency.

3. PERFORMANCE CHECK Service information Phyaction 190 / 190i - Page 9

3.2 IEC 601-1 safety tests For the full description of these tests we refer to the IEC 601-1 (1988) for Class I, Type BF equipment. Here is just a short reminder list of the tests and the test limits.

Measurements limits

Insulation resistance mains Insulation resistance applied part

Protective earth resistance

Enclosure leakage current normal Enclosure leakage current open lead Enclosure leakage current open earth Enclosure leakage current reverse Enclosure leakage current open lead Enclosure leakage current open earth

Earth leakage current normal Earth leakage current open lead Earth leakage current reverse Earth leakage current open lead

Patient leakage current normal Patient leakage current open lead Patient leakage current open earth Patient leakage current reverse Patient leakage current open lead Patient leakage current open earth

Mains on applied part normal Mains on applied part reverse

Dielectric strength A.P. + CASE to MAINS * Dielectric strength MAINS + CASE to A.P. *

> 2.0 MΩ > 2.0 MΩ

< 0.2 Ω

< 100 µA < 500 µA < 500 µA < 100 µA < 500 µA < 500 µA

< 500 µA < 1000 µA < 500 µA < 1000 µA

< 100 µA < 500 µA < 500 µA < 100 µA < 500 µA < 500 µA

< 5000 µA < 5000 µA

> 1500 V > 1500 V

rms

* These tests need only be executed if repairs have been made in the mains part or in the output circuits.

3.3 Performance check of the ultrasound treatment heads In the software of the Phyaction 190 a special menu for service purposes only is included. Most of these features can be used for trouble shooting. You can find the description of the other items of the service software in chapter 4 TROUBLE SHOOTING, section 4.3 Description of the service software. In this section the software that is made to check the contact detection of the ultrasound heads will be described.

You enter the service menu by holding down the fourth and sixth blue function key while switching on the device. As soon as you hear the buzzer you should release the keys. If you did it right, you will see at the bottom of the start-up screen that the Phyaction 190 is in service mode. You can now enter the service menu by holding down the yellow key for about 3 seconds. For software version 3.01 and up you should press the fourth and sixth blue function key again to get the full service menu. You should be aware that the full service menu is for service personnel only, so never tell a physiotherapist or doctor how to enter this menu, because they might do things that will harm the appliance or the treatment heads. To check the performance of the ultrasound head, select menu item 3 Check Vusi dry/wet.

You can connect one or two treatment heads, the appliance will measure both at the same time if two heads are connected. On the LCD you will see an instruction to make the heads dry. Make sure that no water or gel is on the treatment surface of the heads. Then you press the green button (memory), as instructed. The

3. PERFORMANCE CHECK Service information Phyaction 190 / 190i - Page 10

microcontroller will measure a voltage (Vusi) which is related to the current that is flowing through the treatment head: Vusi dry. After this measurement you will see an instruction on the LCD to put the treatment heads in water. Put the treatment heads in a spacious bowl of water (room temperature) and make sure that the ultrasound waves which are reflected by the bottom or the side of the bowl don't come back to the treatment heads, because that might affect the integrity of the measurement. Then press the green button as instructed. The microcontroller will then measure the same parameter as before: Vusi wet. In the following table are the values for the different frequencies and treatment heads which should be met.

Head type frequency Vusi dry / Vusi wet

Small 1 MHz > 1.5

Small 3 MHz > 1.3

Large 1 MHz > 1.5

Large 3 MHz > 1.3

If the measured values don't meet the specifications, you can first try to remeasure it with the treatment head in a different angle in the bowl of water. If that is giving similar results, then check the numbers on the treatment head label with the numbers in the appliance (see section 1.3.6 Checking the ultrasound heads or Appendix 2 TUNING THE ULTRASOUND TREATMENT HEADS). If all of these things are checked and meet the specifications, then the treatment head is probably defective and should be exchanged.

3. PERFORMANCE CHECK Service information Phyaction 190 / 190i - Page 11

CHAPTER 4 TROUBLE SHOOTING

4.1 Introduction

If a Phyaction 190 is defective, in most cases the unit will detect an error in the automatic self test. A full description of this test will therefore help the service technician in finding the error. In the next paragraph you will find this description. Some errors may only occur during normal operation, so you will also find the tests that are carried out during normal operation in that section. To give the service technician some extra tools for trouble shooting, Uniphy has developed a special service menu with features specially for service operations. This service software is described in section 4.3. Finally in Appendix 3 you will find a list of all possible error messages and possible causes.

4.2 Description of the automatic selftest This paragraph describes the internal self test of the Phyaction 190, the (critical) error messages and the possible cause of the errors.

The following categories of errors are identified:

- Errors during self test

- Errors during normal use

- Software errors

If simple errors occur that can be corrected by the user an error message appears on the bottom line of the display. These messages show the kind of error and a possible solution. These errors are described in the user manual. Errors that cannot be corrected by the user are displayed as shown in figure 4.1 (where the numbers are randomly chosen).

Figure 4.1, Error message

The error codes presented after 'Code:' are described in paragraphs 4.2.3 and 4.2.4. In some cases the hexadecimal number after 'Value' gives additional information about the error. The error address indicates the address of the routine where the error occurred. The hexadecimal values after 'Stack:' represent the position of the stack pointer and the contents of the stack, showing the value of the program counter when the error routine was called.

If the error routine detects that the LCD display is not functioning properly, or if the display is not yet initialized, the buzzer will be activated a number of times. The number of beeps indicate the type of error (see also paragraphs 4.2.3 and 4.2.4)

4.2.4 Error shutdown procedure If the processor detects an error that cannot be corrected by the user, the complete ultrasound unit is put in a safe condition and the processor will enter an infinite loop in which normal operation is not possible. If an error is encountered that the user can correct, it will depend on the kind of error whether the ultrasound unit is switched off or continues working.

The following shutdown procedure takes place:

- The red ERROR-LED is switched on

- The Fan starts working

- The buzzer will sound for approximately half a second

- The duty-cycle is set to 0

- The ultrasound voltage is set to its minimum value

5. TROUBLE SHOOTING Service information Phyaction 190 / 190i - Page 12

+ 32 hidden pages