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uniphy Phyaction 740 Series Service Information

Light therapy physiotherapy unit
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SERVICE INFORMATION
PHYACTION 740 & 790 SERIES
Copyright© Uniphy BV 1995
Phyaction® is a registered trademark of Uniphy BV
Art. Code 93007916.5
Phyaction is manufactured in The Netherlands by Uniphy BV
P.O.box 558, NL-5600 AN Eindhoven, the Netherlands
Tel. +31-499-471771 Fax +31-499-474734

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  • Page 1 PHYACTION 740 & 790 SERIES Copyright© Uniphy BV 1995 Phyaction® is a registered trademark of Uniphy BV Art. Code 93007916.5 Phyaction is manufactured in The Netherlands by Uniphy BV P.O.box 558, NL-5600 AN Eindhoven, the Netherlands Tel. +31-499-471771 Fax +31-499-474734...

  • Page 2: Table Of Contents

    GENERAL INFORMATION CHAPTER 1 ..............1 Introduction..........................1 Safety aspects ........................1 Installation..........................2 Description of the controls ....................3 Technical specifications ...................... 6 Explanation of symbols......................9 Photos of the current waveforms ..................14 THEORY OF OPERATION CHAPTER 2 ..............

  • Page 3: Chapter 1 General Information

    GENERAL INFORMATION CHAPTER 1 Introduction The Phyaction 796 is an appliance for ultrasound therapy, electrotherapy (1 channel medium frequency or TENS), combination therapy (MF & US) and laser therapy. The Phyaction 792 is the same as the 796, except that it can't support laser therapy. The Phyaction 793 is the same as the Phyaction 792, except it also contains rectified currents for electrotherapy.

  • Page 4: Installation

    A warning sign should be hung on the door to the area in which laser therapy is being applied. The sign should include the laser warning symbol and the text "Attention, laser light is used in the area". The equipment may not be disinfected or sterilized. The equipment contains a number of safety systems which operate independently of the microprocessor.

  • Page 5: Description Of The Controls

    holding it down until the STANDARD SETTINGS menu appears. You have the choice from various languages. Once selected, the equipment will use the language you have chosen. 1.3.5 Location and transportation The equipment must be set up horizontally and stable. You must ensure that the perforated sections on both sides of the casing are not covered up, thus hindering air circulation.
  • Page 6 The yellow lamps beside the output connectors for the ultrasound heads and the laser probes illuminate respectively as soon as ultrasound or infra-red power is emitted. The yellow lamp beside the current output illuminates as soon as 5mA of current is exceeded. 1.4.3 Infra-red sensor Infra-red laser beams are invisible.

  • Page 7: Technical Specifications

    For reasons of patient safety and correct operation of the equipment, the connection of probes other than those supplied by Uniphy is not permitted. If in doubt about the proper operation of your laser probe, you can check this by using technical application no.
  • Page 8 1.5.1 Ultrasound therapy General: Duty-cycle adjustable from 1:1 up to 1:15 Power setting using potentiometer The unit calculates the total effective power and displays it on the LCD Option to tune the ultrasound head to the unit using a special program Option of combination therapy using one of the 4 options with electrotherapy current forms For each head a green lamp illuminates as soon as the head is selected During insufficient contact the ultrasound power is automatically reduced and a red lamp...
  • Page 9 Pulse duration: 150 ns Beam diameter: 2.5 mm Divergence angle: approx. 20 degrees Dimensions: diameter 2.5 cm, length 21 cm Specifications 25 W probe (model 242): Peak power: minimum 22 W, maximum 30 W Max. average power: 25 mW Wave length: 904 nm (infrared) Laser class: Pulse duration:...
  • Page 10 Burst frequency: 1 - 10 Hz Number of pulses per burst: Output current: 140 mA maximum at 500 Ohm peak Pulse form: asymmetrical TENS current, surge (Phyaction 793 only): Pulse time: 10 - 300 µs Pulse frequency: 1 - 500 Hz Train duration: 1 - 100 s Train interval:...

  • Page 11: Explanation Of Symbols

    Acoustic monitor with volume control can be switched on Serial input and output for extensions Built-in electrode and cable test Solid metal casing (Faraday's cage) Ergonomically designed with very attractive appearance Simple to operate due to clear symbols and the availability of different languages on the display Dimensions: 41 x 28 x 13 cm Weight...
  • Page 12 1.6.3 Electrotherapy, parameter adjustments Contour Pulse time biphasic current Frequency of biphasic current Burst frequency of biphasic current Stimulation time with MF surge current Stimulation interval with MF surge current Timing clock Sound signal on/off 1.6.4 Ultrasound therapy Selected ultrasound head, small, large, extra large Duty-cycle 1.6.5 Ultrasound therapy, parameter adjustments...
  • Page 13 Pulse repetition frequency Turn key clockwise Turn key anti-clockwise 1.6.7 Laser therapy, parameter adjustments Selectable laser probe, 15W Selectable laser probe, 25 W Selectable laser probe, 4 x 18 W Pulse repetition frequency Distance between laser probe and skin Set total energy to zero Repeat function Sound signal on/off 1.6.8...
  • Page 14 1.6.9 Symbols on the front of the appliance Memory function Return to main menu Options for this program Raising the selected parameter Lowering the selected parameter Indication light for Stand-by Indication light for stimulus Indication light for detected errors Current "OFF"...
  • Page 15 1.6.10 Symbols on the back of the appliance Fuse Serial in- and output Equipotentiality Type BF Do not open Attention, see manual 1.6.11 Laser, warning symbol and explanatory labels Laser warning symbol; on every laser probe INVISIBLE LASER RADIATION Explanatory label; on every laser probe AVOID EXPOSURE TO BEAM CLASS LASER PRODUCT...

  • Page 16: 1.7 Photos Of The Current Waveforms

    LASER APERTURE Explanatory label; on laser probe model 242 25 W / 200 ns/ 904 nm LASER APERTURE Explanatory label; on laser probe model 245 4x18 W /150 ns/904 nm Type B 1.7 Photos of the current waveforms Two pole interference MF surge current Biphasic current, burst Biphasic current, continuous...

  • Page 17: Chapter 2 Theory Of Operation

    THEORY OF OPERATION CHAPTER 2 Introduction In this chapter a description of the electronic construction of the Phyaction 790-series is given on the functional level. Only where safety aspects are concerned we will look into the actual circuitry. The next paragraph deals with the whole appliance and those blocks that are in use with all therapies.
  • Page 18 2.2.1 Microcontroller core As central processing unit a microcontroller is being used in favour of a microprocessor. The reason being that a microcontroller, by its construction and available commands, is particularly suited for bit-level operations. From the software point of view there is no difference but it is much easier to manipulate a single I/O-pin.

  • Page 19: Electrotherapy Unit

    level for the logic ICs. Electrotherapy unit Figure 2 shows the functional blocks for the electrotherapy unit and the associated safety circuit. These circuits are identical to the ones in the Phyaction 780-series. Just a minor simplification has been made in the setting of the maximum current guarding because for the near future only generation of MF currents and TENS is envisaged.

  • Page 20: Ultrasound Therapy Unit

    2.3.3 Voltage to current converter The voltage-to-current-converter (V/C-converter) converts, as the name indicates, the applied input voltage into a linear proportional output-current. As it is conceived as a balanced stage it is easy to determine the polarity of the output current by applying the controlling voltage to one of the two inputs. The primary output current flows through a low-ohmic resistor.
  • Page 21 Figure 3, Functional blocks of the ultrasound therapy unit Settings of parameters as duty cycle, treatment time and frequency, 1 or 3 MHz resp., is done over the user interface. The microcontroller determines the precise operating frequency for the selected treatment head, based upon the identification codes that have been entered during installation of this treatment head.

  • Page 22: Infrared Laser Unit

    2.4.3 Secondary switch mode power supply This is a regular down-converter powered by the +29V supply. The only peculiarity being that its output voltage is controllable by V . In this way the microcontroller can set the ultrasound power by setting control proportional to the square-root of the required power.
  • Page 23 Figure 4, Functional blocks of the infrared laser therapy unit The microcontroller controls the laser probes through the I/O-buffers. The operator sets with the energy control-knob the amount of energy that has to be delivered. The microcontroller converts this, depending on the selected repetition rate, distance to the surface to be treated and the laser probe being employed (= type of laser), into energy per square centimetre and required treatment time.
  • Page 24 2.5.4 Trickle charger At repetition rates below 400 Hz the leakage discharge of the capacitor gets significant so too less energy would remain for the next laser pulse. Therefore this trickle charger which operates in parallel to the switching element in the laser probe periodically restores the energy level between the laser pulses. 2.5.5 Laser test facility A photo-pindiode is illuminated trough an attenuating window by the laser diode to be measured.

  • Page 25: Chapter 3 Performance Check

    CHAPTER 3 PERFORMANCE CHECK Safety inspection 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? Are the electrodes, cables and connectors undamaged? Are ultrasound therapy, cables and connectors undamaged? (Pay special attention to...
  • Page 26 3.1.4 Functional test, ultrasound part Passed, when all applicable items are answered with YES. Is the appliance adjusted to all treatment heads? 1 cm² 4 cm² 10 cm² Does the ultrasound output correspond with the power displayed on the 1 cm² LCD, for both frequencies at maximum intensity? 4 cm²...

  • Page 27: Chapter 4 Adjustment Procedures

    For this adjustment you will need a calibrated laser probe (model 241 or 242), which can be bought from Uniphy. Uniphy will carry out a yearly calibration if wanted. This adjustment has to be carried out every time the control board (PCB 791X) is exchanged.

  • Page 28: Chapter 5 Trouble Shooting

    TROUBLE SHOOTING CHAPTER 5 Introduction In this chapter a description is given of the most common error messages and their probable cause. The following categories of errors are identified: Errors during selftest Errors during normal use Software errors With a number of errors a special message is displayed explaining in short what the detected problem is. All other errors are displayed in the following manner (the numbers are just an example and change per error): THE PROCESSOR HAS DETECTED AN ERROR...

  • Page 29: Error Shutdown Procedure

    Error shutdown procedure The safety circuit will switch off the safety relay directly in the event of an error, thus disconnecting the output from the unit to external connections to avoid danger to the patient. In addition to this the microprocessor will, if it detects an error either from the safety circuit or otherwise, perform the following actions: Safety relay off: Patient circuit disconnected.
  • Page 30 Program storage test. By means of a checksum test on the first 32k the data integrity of the program stored in EPROM is tested. In case of a failure the buzzer will be activated 6 times (ERROR 21). With the above tests the operation of the microcontroller is tested. PERIPHERAL TEST Bank switch circuit.
  • Page 31 6.1 and 8.0 V (on ADC 1.10 and 1.45 V, ADC-values 00E1 and 0128h). When the voltage is out of range ERROR 60 is reported, with error value the measured ADC-value. Optocoupler test. The voltage returned from the optocouplers for high resistance check (patient circuit resistance) must be between 3.75 V and 4.25 V (ADC-values 02FFh and 0365h) in case there is no output current set.
  • Page 32 is not activated within 40 msec ERROR 65 is generated, with error code 0. Test if the safety relay contacts open. If the above test passes but a closed circuit is detected (Vmf below 20.7 V, on ADC 3.73 V, ADC-value 02FBh) the same error is generated, ERROR 65. This time the error code is 1 and the error value the measured ADC-value.
  • Page 33 The microcontroller verifies whether the voltages indicating the type of ultrasound treatment head connected are within the following ranges: Small head: 0.88 .. 1.48V, ADC-value: 00B4h .. 012Eh Large head: 2.20 .. 2.80V, ADC-value: 01C2h .. 023Ch Extra large head: 3.48 ..
  • Page 34 Finally the supply is set to minimum voltage, the test line TST4 is deactivated and the ultrasound power stage is switched on for 100 msec. When the error line (ERRORus) is still active you will get ERROR 73, with error code 5. 5.3.4 Test laser generator TEST OF THE PROBE TYPES The microcontroller verifies whether the voltages indicating the type of laser probe connected are within...

  • Page 35: Error Numbers Summary

    Error numbers summary Software RANGE_ERR Range error CALL_ERR Call error TILT_ERR Tilt error Microcontroller PROC_ERR Controller error EPROM_ERR EPROM checksum error ERAM_ERR External RAM BANK_ERR Bankswitch error MEM_ERR Memory error Peripherals _8155_ERR 81C55 error _8253_ERR 82C53 error I2C_ERR I²C error ADC_VREF_ERR Reference voltage internal ADC error POTREF_ERR...

  • Page 36: Error Descriptions

    Ultrasound errors HDTYPE_ERR Unknown head type HDTEMP_ERR Head temperature error VSNSUS_ERR Ultrasound power supply error US_ERR General ultrasound error VUSI_ERR greater than 0 Volt at duty-cycle 1:0 USPOT_ERR Switch of ultrasound intensity control is defective Laser errors PBTYPE_ERR Unknown probe type PBACT_ERR Probe active LSEYE_ERR...
  • Page 37 Name Description Code Value Addr. EPROM_ERR EPROM checksum error bank calculated checksum ERAM_ERR external RAM error error address BANK_ERR Bankswitch error bank MEM_ERR Memory error PatMem DefMem SysMem PrgMem 3. Peripherals (during selftest) _8155_ERR 81C55 error: byte read error port A byte read addr.
  • Page 38 4. Peripherals (during normal operation) ADC_ ADC time out TIMEOUT LCD_ LCD time out TIMEOUT OC_ERR Optocoupler error OCdet (ADC) I2C_ I²C time out (0=send,1=receive) TIMEOUT keyboard (KB) front panel (FP) ultrasound (US) dose (DS) KEYBOARD_ Keyboard error sent / received BININ_ERR Instable digital signal number low/high...
  • Page 39 SHORT_ERR Short circuit relay error Vmf (ADC) RELMAX_ERR Safety relay doesn't switch at maximum current safety circuit doesn't activate safety relay doesn't switch off Vmf (ADC) LIM150_ERR 150% limit circuit error MF-error line active comparator 1 doesn't work comparator 2 doesn't work LIMMAX_ERR Maximum current limit error comparator switches too soon...
  • Page 40 PBTYPE_ERR Probe type unknown PBtyp* (ADC) PBACT_ERR PbAct active during test LSEYE_ERR Voltage laser test cell error LASeye (ADC) LS_ERR General laser error LSPOT_ERR Switch of laser dosage regulator VPOTlas (ADC) defective Service Information Phyaction 740 & 790-series Page 38...

  • Page 41: Chapter 6 Circuit Diagrams

    CIRCUIT DIAGRAMS CHAPTER 6 Overview of the circuit diagrams: Sheet 7 Wiring diagram Sheet 9 Main PCB 7925 Sheet 10 Microcontroller core Sheet 11 I/O Expander Sheet 12 Waveform synthesis Sheet 13 V/I Converter Sheet 14 Safety Sheet 15 Controls & rectifier Sheet 16 Outputs Sheet 17...
  • Page 59 Uniphy International B.V. The Netherlands C o m p o n e n t L a y o u t P C B 7 9 1 6 7916.ps August 23, 1995 29-1...
  • Page 60 Uniphy International B.V. The Netherlands C o m p o n e n t L a y o u t P C B 7 9 5 3 & 7 9 7 0 7953.ps July 19, 1994 33-1...
  • Page 61 Uniphy International B.V. The Netherlands C o m p o n e n t L a y o u t P C B 7 9 4 3 7943.ps December 23, 1992 32-1...
  • Page 62 Uniphy International B.V. The Netherlands C o m p o n e n t L a y o u t P C B 7 9 3 2 7932.ps August 24, 1995 31-1...
  • Page 63 Uniphy International B.V. The Netherlands C o m p o n e n t L a y o u t P C B 7 9 2 7 7927.ps September 20, 1994 30-1...
  • Page 64 Property of : Uniphy International B.V. The Netherlands Drawn by : N.H. Beun Approval : Title C o m p o n e n t L a y o u t P C B 2 4 0 3 Size Document Number 2403.ps...

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