GymnaUniphy Phyaction 787 User manual

CHAPTER 1 GENERAL INFORMATION

1.1 Introduction

The Phyaction 787 is an advanced electro-therapeutic appliance. It is able to offer every form of electro-therapy from low frequency to medium frequency currents passing through one or two output channels, with or without making use of the build-in vacuum unit.

The text in italic with a footnote refer to the numbers on the fold out page at the last page of this service manual.

1.2 Safety aspects

Electrical safety

The appliance may only be used in an area which conforms to all the legal and statutory requirements.

Fire and Explosion hazards The appliance should not be used in the proximity of inflammable gases or vapours. Make sure the appliance is turned off when disinfecting the work area as some disinfectants evaporate and form an explosive mixture.

Operational safety

- Simultaneous use of this appliance with a high frequency surgical appliance on a patient could cause burns to occur underneath the electrodes. A short-wave or micro-wave appliance could influence the output current of the appliance if used in the proximity.

- The appliance should be used solely for electro-therapy. It should only be used in dry workrooms and is not suitable for wet areas.

- The appliance should not be disinfected or sterilized.

- The appliance is intended for continuous use.

- The appliance possesses a built-in safety system which works independently from the processor, so that if it encounters a mistake it automatically switches off the output current within a few milliseconds, thereby making it impossible to continue the therapy and thus guaranteeing the patient's safety. Every time the appliance is switched on (by means of the main on/off switch) the processor runs through the whole safety system to ensure it is functioning correctly.

Use of the appliance The appliance should only be used by qualified operators according to the instructions stated herein.

This equipment is intended to be used exclusively for the administration of electrotherapy.

1.3 Installation

Incoming inspection

Upon receiving the appliance, check to see that no damage has occurred during transport and if all the parts are intact and the whole is complete (see chapter 1 TECHNICAL SPECIFICATIONS). Should you perceive anything wrong, please notify your dealer immediately.

Mains voltage

GENERAL INFORMATION Service information Phyaction 787 - Page 1

The appliance can be run off the mains at 110, 120, 220, or 240 Volts AC, 50/60 Hz. At the back of the appliance you can read for which of the above your appliance has been set. You cannot change the setting yourself. Please ensure that it is correct before plugging into the mains. The mains input is at the back of the appliance.

Function testing The electrical performance and safety of the appliance is checked throughout its production and before leaving the factory. Every time the appliance is turned on with the main switch the processor carries out an elaborate control to ensure all its functions are working correctly. During this control, check for your part that the display and all the lights are also in order. For a complete functional check refer to the Function test/verification chapter.

Choice of language The appliance offers a choice of languages in which you can give your instructions. The setting of your choice is achieved by holding down the yellow key for several seconds until the menu Standard settings appears. After you have chosen one of the languages, the appliance will communicate with you in the language of your choice.

Setting up and transportation When you are about to use the appliance for the first time you are requested to read chapters SAFETY ASPECTS and INSTALLATION beforehand. Place the appliance horizontally on a stable base. Make sure the vents are not obstructed in any way so that effective ventilation is impeded. Do not place any objects on top of the appliance and ensure that no liquids get into it. Should you transport the appliance on its side, for instance in a case, we recommend that you empty the water reservoir of the vacuum unit first.

1.4 Description of the Controls

Display screen

The display

is composed of 15360 separate pixels, each of which is separately controlled by a processor in order to form text and figures. The screen will display all the data you require while you are treating a patient.

- the name of the program chosen is displayed at the left top with the current type in stylized form

at the left top.

- the middle section offers you data concerning parameters.

- the section on the right hand side gives you data on output current, polarity, duration of

treatment and the type of electrode.

- the bottom section of the display denotes the functions of the blue control key.s

Layout of the display

Signal lights In the center of the panel you will find three colored lights, whereas next to each output circuit there is a yellow light.

- The green LED

shows the appliance has been connected to the mains and that the main

switch is on.

GENERAL INFORMATION Service information Phyaction 787 - Page 2

- The yellow monitor LED

offers you data concerning the stimulus. It will display the stimulus time for faradic surge current, interrupted galvanic current and medium frequency surge current. For currents with frequency modulation it will display the period when the frequency is low, i.e. at the most sensitive for the patient.

- The red LED on the display. See chapter Error messages.

- The yellow LED

only turns on if the safety system has encountered a fault. A message will appear

next to the outputs will light up as soon as a current greater than 5 mA

eff

passing through the relevant circuit.

Knobs On the right hand side of the front panel there are four knobs with the following functions, from bottom to top:

- The dosage regulator the left a click is felt and the regulator will be on zero.

- The current mode switch

- The contrast knob

- The vacuum regulator

, a conveniently large knob for accurate adjustment. When turned fully to

with which you can choose between rectified or alternating current.

which regulates the brightness of the display.

(only on model 787) with which you activate the vacuum pump unit and regulate the suction force. If a pulsating vacuum is desired, this can be obtained through the right yellow key. The pump can be turned on at any moment, but only when the dosage regulator is on zero will the outputs be switched over from the banana to the tube sockets. On the right hand side of the display you will find data concerning electrode application.

Push buttons

- The blue keys clearly whether the keys have got a function and if so, which one.

- The black keys Up and Down parameter.

- The left yellow key this key should be held down for a few seconds and a special STANDARD appear.

- The right yellow key

- The green key

have a function which varies per program and per menu. The display will show

are used to increase or decrease the value of a pre-selected

is used to return to the MAIN MENU. When a different language is required

SETTING menu will

shows you clearly and rapidly what other possibilities a program offers.

enables you to activate the special memory function any time this is required.

Here 250 different parameter sets can either be stored, recalled or changed.

Output sockets at the front

- Model 782 has one or two output circuits which the electrodes are plugged. The cables of the electrodes are equipped with safety plugs.

- The 787 model has besides the safety banana sockets, two sets of tube sockets

. Each consists of two safety banana sockets onto

for the

vacuum electrodes.

- The output circuits for the 782 and 787 models are called A and B. Seen from the front, A is on the left and B is on the right.

Controls at the back of the appliance

- The mains entry port and the main switch

- The fuse holder

is situated between the mains entry port and the main switch. The required

type of fuse is listed on the back of the appliance.

- The drainage tube

from the water reservoir. The vacuum pump will suck the moisture out of the sponge heads which will be collected in the reservoir inside the appliance. A message on the display warns you when the reservoir is full.

- The air outlet

of the vacuum pump. Do not cover up this opening in any way. The air blown out in this way will be dry as the moisture sucked up at the same time will have been extracted and collected in the reservoir.

- The serial in- and output socket

. This has been added for future extensions.

GENERAL INFORMATION Service information Phyaction 787 - Page 3

- The socket to connect the appliance to the potential equalization busbar

1.5 Explanation of Symbols

General

indication of treatment time

indication of polarity

output via channel 'A' ON/OFF

output via the plate electrodes

output via the vacuum electrodes

Rectified current forms

rectified current forms

galvanic continuous

interrupted rectangular

interrupted triangular

faradic rectangular

faradic triangular

ultra Reiz

MF modulation

DF modulation

CP modulation

CP-iso modulation

LP modulation

Options for rectified current forms

option key for selection of faradic triangular

option key for selection of faradic rectangula

alternating polarity ON

alternating polarity OFF

alternating channels ON

alternating channels OFF

sound signal ON/OFF

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balance key

Alternating current forms

alternating current forms

distribution of stimulation in isoplanar vector field

direction of stimulation in dipole vector field

direction of stimulation in classic interference current

two pole MF current

MF surge current

biphasic types of current

biphasic current, continuous

biphasic current, random

biphasic current, burst

biphasic current, surge

Options for alternating current forms

biphasic asymmetrical pulse

biphasic sequential pulse

biphasic symmetrical pulse

balance key

key for adjusting direction of dipole vector

alternating channels ON

alternating channels OFF

sound signal ON/OFF

Parameter adjustments

pulse time

pulse interval

train time

train interval

GENERAL INFORMATION Service information Phyaction 787 - Page 5

contour

pulse time biphasic current

frequency of biphasic current

stimulation time with biphasic and MF surge

stimulation interval with biphasic and MF surge

timming clock

interchancing poles

Treatment memory

programmable memory

patient card 75 selected

CURRENT FORM memory menu

COCKTAIL memory menu

I-T CURVES memory menu

saving a current form

saving a cocktail step

saving an I/t curve

erasing the contents of the memory

I/t curve

reviewing the I/t curve

making a corrective measurement

moving the cursor left and right

Vacuum unit

continuous vacuum

intermittent vacuum

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

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Indicator light for stand-by equalizer

Indication light for stimulus

Indication for detected error

Output

"OFF" for a part of equipment

Alternating current

Symbols on the back

Rectified current

Display screen contrast

Plate electrodes

Vacuum electrode

off

fuse

water reservoir

serial in- and output

potential mains equalizer

type BF

do not open

read manual

GENERAL INFORMATION Service information Phyaction 787 - Page 7

100 YYYY-MM Date of manufacturing, year-month

XXXXX Serial number

LOT

Special symbols for CSA

101 Caution, to reduce the risk of electric shock,

do not remove cover.

102 Warning. Risk of fire. Replace fuse as

marked

T630H250V Fuse T 630 mA, 250 V

1.6 Technical specifications

Rectified currents

Programs:

- Continuous galvanic current

- Interrupted galvanic current, rectangular or triangular pulse

- Ultra Reiz current

- Faradic current, rectangular and triangular pulses Parameters:

- Pulse time 0.1/1000 ms

- Pause time 2/10000 ms

- Train time 1/100 sec

- Rest 1/100 sec

- Surge 0/100%

- Maximum output current 80 mA

at 500 Ω

peak

- Channel choice A or B, or both

Diadynamic currents Programs:

- MF

- DF

- CP

- CP-ISO

- LP Parameters:

- MF frequency 5/200 Hz

- DF frequency 2 x MF frequency

- MF time 1/100 sec

- DF time 1/100 sec

- Contour 1/100%

- Maximum output current 80 mA

at 500 Ω

peak

- Channel choice A or B, or both

Four-pole interference currents Programs

- Isoplanar vector field

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- Dipole vector field

- Classic interference Parameters:

- Carrier frequency 4000 Hz

- AMF 1-200 Hz

- Spectrum 0-200 Hz

- Time in which the spectrum is swept 1-100 sec

- Contour 1-100%

- Dipole vector field rotatable through 360°

- Rotation speed of the dipole vector 0-10 sec

- Maximum output current per channel 140 mA

at 500 Ω

peak

Two-pole medium frequency current

- Carrier frequency 4000 Hz

- AMF 1-200 Hz

- Spectrum 0-200 Hz

- Time in which the spectrum is swept 1-100 sec

- Contour 1-100%

- Maximum output current 140 mA

at 500 Ω

peak

- Channels choice A or B, or both

Medium frequency surge current

- Carrier frequency 4000 Hz

- AMF 1-200 Hz

- Stimulus time 1-100 sec

- Rest 1-100 sec

- Surge 0-100%

- Maximum output current 140 mA

at 500 Ω

peak

- Channels choice A or B, or both

Biphasic current, continuous Parameters:

- Pulse time 10-100 µsec

- Pulse frequency 1-1000 Hz

- Spectrum 1-200 Hz

- Time 1-100 sec

- Contour 1-100%

- Maximum output current 140 mA

at 500 Ω

peak

- Channel choice A or B, or both Pulse form: asymmetrical, symmetrical or sequential pulse

Biphasic current, random Parameters:

- Pulse time 10-100 µsec

- Pulse frequency 1-1000 Hz

- Maximum output current 140 mA

at 500 Ω

peak

- Channel A or B, or both Pulse form: asymmetrical, symmetrical or sequential pulse

Biphasic current, burst Parameters:

- Pulse time 10-100 µsec

- Pulse frequency 80-1000 Hz

- Burst frequency 1-10 Hz

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- Maximum output current 140 mA

at 500 Ω

peak

- Channel choice A or B, or both Pulse form: asymmetrical, symmetrical or sequential pulse

Biphasic surge current Parameters:

- Pulse time 10-100 µsec

- Pulse frequency 1-1000 Hz

- Train duration 1-100 sec

- Train interval 1-100 sec

- Contour 1-100%

- Maximum output current 140 mA

at 500 Ω

peak

- Channel choice A or B, or both Pulse form: asymmetrical, symmetrical or sequential pulse

Vacuum unit

- Working pressure maximum 0.3 bar (continuous) or 0.5 bar (pulsed)

- Continuous or pulsating vacuum with adjustable rhythm

- Signal for a full water reservoir

- Outputs are automatically switched from banana to vacuum sockets whenever the vacuum pump is activated.

Memory and I/t curve

- Fully programmable treatment memory with space for up to 250 treatment procedures and with battery back-up

- 69 standard programs for straightforward application with each indication

- Facility to formulate cocktails and to store them in the memory

- Automatic recording of the I/t curve

- I/t curve depicted graphically on the display

- Facility to store the I/t curve in the memory

- Automatic determination of the Accommodation Quotient (AQ)

- Assorted languages of instruction can be selected including: Dutch, English, German, French, Italian and Spanish

- Parameter pre-settings can be amended as you judge to be appropriate

General

- Treatment time digitally adjustable

- Beep can be turned on

- Choice of automatic or manual stimulus with a pulsator

- Automatic interchange of poles with gradual dose transition

- Alternating polarity for the treatment of patients with implants

- All current forms can be applied through two channels, also low-frequency and biphasic current

- Alternating channels for sequential stimulation

- Programmable memory for 250 treatments and battery back-up

- 50 standard programs for applications by indication.

- Choice of four languages on the display

- Extensive system for pre-setting the parameters

- Automatic polarity reversal with gradual change

- Serial in- and output socket at the back for future extensions

- Built-in electrode- and cable tester

- Solid metal casing (Faraday's cage)

- Ergonomical casing

- Very straightforward to operate due to the use of easily comprehensible symbols and the availability of several different languages of instruction

- Dimensions 41x28x13 cm

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- Weight 9 kg

- Insulation class I type BF

- Voltage 110, 120, 220 or 240 Volt AC, frequency 50/60 Hz

- Input current 600 mA

- Input current 300 mA

max @ 110 Volt AC mains operation

rms

max @ 220 Volt AC mains operation

rms

Replaceable parts

- Fuses at the main entry 630 mA Slow Blow (110 Volt AC mains setting)

- Fuses at the main entry 325 mA Slow Blow (220 Volt AC mains setting)

Standard equipment The appliance is supplied with standard equipment as listed below. The Uniphy order number is given with each piece of equipment.

Model PHYACTION 782

instructions for use 930080 mains lead, 2.5 m, with IEC powercord plug 131710 4 patient cables, with rubber electrodes 6 x 8.5 cm 131112 6 sponges 6 x 8.5 cm 131102 4 m elastic straps 131589

Model PHYACTION 787 and 785

as model 782 but with extra:

4 vacuum tubes 131555 4 vacuum electrodes 6.5 cm 131560 6 sponges 6.5 cm 131570

For further accessories supplied with this appliance you can consult our catalogue.

GENERAL INFORMATION Service information Phyaction 787 - Page 11

CHAPTER 2 THEORY OF OPERATION

The unit is microprocessor controlled with exception of the safety monitoring circuit. The core consists of a 80C85 Microprocessor with the following peripheral circuits:

- 8 kbyte, battery backed up RAM

- 128 kbit EPROM for waveform tables

- 1 Mbit EPROM for the software

- 2 programmable I/O expanders for digital interfacing

- 8 channel ADC for feedback of analog parameters to the microprocessor

- 2 x 2 channel DAC for waveform synthesis, wave shape

- dual DAC for waveform synthesis, amplitude control

The user interface consists of a graphic LCD display, with its own controller and memory, and a key panel. The display is driven by the microprocessor directly via the microprocessor bus. (data, address and control). The key panel is interfaced through one of the I/O expanders. The user can, by means of the key panel, select the output waveforms and set or change all the relevant parameters through a menu structure. AC/DC selection is not done via the key panel but by means of a dedicated rotary switch. For detailed operating instructions, refer to the 780 series user manual.

Once the current type is selected the microprocessor drives the synthesizer to produce the requested waveform. The amplitude is proportional to the dose control setting. All waveforms are digitally synthesized using the waveform tables stored in EPROM. The digital information is converted to analog with a DAC and fed via two chopper circuits to the voltage to current convertors, two for each output channel.

The voltage to current convertors use transformers in the output thus galvanically isolating the patient circuit from the rest of the electronics. A signal, proportional to the output current, is fed to the safety control circuit. If the output current exceeds a maximum value or is 150% above the value set with the dose control, the error line will be activated. The supply voltage to the dose control is also monitored. The activated error line will cause the safety relay to drop off , isolating the patient circuit from the output. The safety relay will be latched out permanently even if the error condition ceases to exist. At power up the microprocessor has access to the safety circuit for 3 seconds to be able to test the safety relay. After the initial 3 seconds the microprocessor can only switch the safety relay off. The only way to activate the safety relay after a fault is to switch off the unit, clear the fault and switch on the unit.

A lot of thought has gone into the safety of the unit. The safety circuit operates completely independent of the microprocessor. Processor or program failures occurring during the treatment therefore cannot influence the proper function of the safety circuits. At power up of the unit a selftest is executed. The processor tests itself, memory (RAM and EPROM), the timers, the ADC's, the display and supply voltages. The next thing tested is the safety relay and the safety circuit. If any errors are encountered in the selftest, the safety relay is switched off, the fan and the red error light are switched on. If possible an error message is displayed. An complete description of the selftest is discussed in a separate chapter.

The output current from the voltage to current convertors is fed via the yellow output lights, directly to the output or in case DC is selected via the rectifiers and filter to the output. AC/DC selection is done by a manual switch, monitored by the processor. The polarity in case of DC is changed by means of the polarity relay controlled by the processor.

THEORY OF OPERATION Service information Phyaction 787 - Page 1

With the vacuum unit a vacuum can be set in order to use vacuum electrodes. The circuit is switched on with the front panel vacuum control, it automatically switches the output from the banana safety jacks to the tube sockets by means of the vacuum relay, also processor controlled. The vacuum can be set between 30 and 300 mBar. By means of an extra menu, activated when the vacuum is switched on, the vacuum can be pulsed at selectable time intervals. The vacuum will increase from the set value to approximately 1.6 times the value and fall back to the set value. The maximum vacuum for continues vacuum mode is 300 Mbar the maximum in pulse mode will go to 500 mBar. The level of the vacuum is controlled by means of the vacuum pump and an electromagnetic valve. In case the vacuum level is to low the pump speed is increased and in case of to much vacuum, air is let into the system via the valve.

The mains transformer is of a special type. The isolation breakdown between primary and secondary is in excess of 4 kV. The transformer has taps so it can be wired for 110, 120, 220, and 240 Volt mains. The secondary has a 9 Volt and a 25 Volt winding the first is used for the +5 Volt logic supply and the latter for the +29 Volt unregulated and the +24, +15 and -15 regulated supply voltages.

The +5, +15 and -15 Volt supplies have crowbar circuits, shorting out the supplies in case of excess voltage. If the circuit is activated the voltage drops to 0.7 Volt thus protecting the electronics against excessive supply voltages.

The unit also contains a serial communication port. It is intended for use with future extensions of the 780 line. The port is galvanically isolated from the rest of the electronics by means of optocoupler circuits. In older units with 64 kbyte EPROMS the port cannot be used for lack of memory space available for the communication software.

THEORY OF OPERATION Service information Phyaction 787 - Page 2

CHAPTER 3 PERFORMANCE CHECK

1.1 Function test/verification

Required equipment: 1 Variac 1 Scope PM 3050, or equivalent, adjustment 2 Volt/div 2 ms/div Channel A & B 1 Resistance-box 500 Ohm 1 Vacuum meter

Refer to the foldout page (last page in this service manual) for location of controls on front and rear of the appliance.

1. Initial settings:

on/off switch contrast knob

vacuum regulator

current mode switch

2. Adjust the mains voltage (mentioned on the appliance sticker) by means of the variac. Then, plug the mains cable into the mains entry port

3. Switch on the appliance with the mains switch

a. the green LED b. the yellow monitor LED c. the red LED d. the display reports 787,785 or 782

PHYACTION 78x V x.xx made by UNIPHY-NL SYSTEMS CHECK

4. Push buttons test: push both on the left and on the right of each button all working.

5. Check, with the contrast knob

mode switch

on dc 3 . Connect the output via the resistance-box to the scope.

6. Select program 5 (Ultra Reiz). Then, push blue button B X

regulator

on maximum output (80 mA) and check the type of current on the scope. The pulse

time has to be 2 ms and the pause time 5 ms.

on off, dosage regulator6 on 0

in the middle

on 1

on ac 2.

burns,

with the right software version.

if the contrast of the display is adjustable. Then, put the current

. Check now if:

10..14

and check if they are

(see display). Turn the dosage

PERFORMANCE CHECK Service information Phyaction 787 - Page 1

7. Push on the polarity button Also check if the two right output LED's

8. Turn the dosage regulator

regulator

on and check if the vacuum output LED's (left 2 output LED's5) light up.

5 and check on the scope if the polarity of the output changes.

back to 0 and turn on the vacuum regulator9 a little. Turn the dosage

burn.

9. Turn the dosage regulator

current mode switch

10 Turn the dosage regulator

Volt/div ; 2 msec/div):

- if the amplitude is adjustable with the dosage regulator

back to 0 and turn the vacuum regulator9 back to 6. Switch the

to ac 7 and select the first program (isoplanar vector).

slowly to maximum output (140 mA) and check on the scope (2

- if the wave shape is conform the picture below

11 Put the scope on "X deflection." (X/Y) and check if the phase movement is 90° (on the scope

you should see a circle now).

PERFORMANCE CHECK Service information Phyaction 787 - Page 2

12 Turn the dosage regulator

2 (dipole vector). Return to the submenu via button

back to 0. Return to the main menu via button12 and select program

and select AUTO. On the display you will

see a rotating bar.

Turn the dosage regulator

on. Put the scope on "Xdelf." (X/Y) and check if you can also see the

rotating bar on the scope.

13 Turn the dosage regulator

menu via button

button

and select 10. Go to the next submenu via button13 and push button B X10.

and select program 6. Select possibility 2 (random). Go to the submenu via

14 Turn up the dosage regulator

back to 0. Adjust the scope to 0,5 ms/div and (x/t). Go to the main

and check the type of current.

15 Remove the output plug and connect the vacuum meter to all tubeconnectors. Select a program and turn the vacuum regulator

slowly to maximum.

- Check if the vacuum is properly adjustable up to 0,3 bar.

- When the vacuum reaches the 0,3 bar, then listen if the pump stops.

- Go to the vacuum adjustments via button

and select 2.

- Check if the vacuum reaches up to 0,5 bar and returns to 0,3 bar. This cycle lasts about 2

seconds.

16 Select continuous vacuum

12 and release one of the tubes from the vacuum meter. Keep the tube closed (by folding it) and check if the tubeconnector is not choked. Put the tube back and check the other tube connectors in the same way.

17 Put the vacuum regulator

the appliance with the on/off switch

back to position 13 and remove the vacuum meter. Switch off

en remove the mains cable.

PERFORMANCE CHECK Service information Phyaction 787 - Page 3

1.2 Safety inspection

This inspection is for technical maintenance purposes only. It is recommended that this test is carried out once a year. When the appliance is serviced, the full IEC 601-1 tests have to be carried out. A short description of these tests is in section 3.3.

1.2.1 Visual inspection

Passed, when all applicable items are answered with YES.

yes no

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?

1.2.2 Functional test

Passed, when all applicable items are answered with YES.

yes no

Is the automatic selftest executed successfully at power on?

Is an error message appearing when the appliance is powered on with the current dose potentiometer turned on?

Is an error message appearing when the AC/DC-switch is changed with the dose potentiometer turned on?

Do the current waveforms and amplitudes correspond with the data in the user manual when measured with an oscilloscope and a 500 Ω load?

1.2.3 Test of the electrical safety according to VDE 0751

Parameter Measured value Limit Remarks

Protective earth resistance

Enclosure leakage current

Patient leakage current

Ω

µA < 1000 µA

µA < 5000 µA

< 0,2 Ω

PERFORMANCE CHECK Service information Phyaction 787 - Page 4

1.3 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 during 1 minute or, * Dielectric strength A.P. + CASE to MAINS during 1 second * Dielectric strength MAINS + CASE to A.P. during 1 second *

> 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

rms

> 1800 V

rms

> 1500 V

rms

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

PERFORMANCE CHECK Service information Phyaction 787 - Page 5

CHAPTER 4 ADJUSTMENT PROCEDURES

On the main board and the control board several adjustments are located. Most of these adjustments are factory set, at the factory special software and test fixtures are used to be able to make the proper adjustments. No attempt should be made to alter these adjustments in the field with exception to the adjustments described below.

1.1 Vacuum adjustment

Required equipment : Multimeter with 300 mV range 1% or better Vacuum and output test fixture or vacuum gauge (0..600mBar)

* Performance verification

Connect the testfixture ( or a vacuum gauge ) to the tube connectors. Switch on the unit and turn the vacuum regulator Measure the vacuum, the value should be 300 mBar ± 30 mBar ( 300 mV ± 30 ).

* Adjustment procedure

Adjustments and measurements are done on the main board step adjustment 1 Switch of the unit, remove the powercord, and take off the cover of the unit. 2 Reconnect the powercord, connect the testfixture (or vacuum gauge) 3 Turn on the unit and turn the front panel vacuum regulator

position

4 Disconnect one of the terminals of the vacuum pump and let air in to the system by

temporary removing one of the tubes. Watch out for the live mains connector !!! 5 Connect the multimeter high to MP31 and common to MP32 select the 300 mV range. 6 Adjust P402 for 100 mV ± 5 mV 7 Reconnect the pump. 8 Adjust the vacuum with P401 for 300 mBar ± 10 with the vacuum regulator

maximum clockwise position. 9 Repeat steps 4 through 8 until both are correct. 10 Switch of the unit and remove the powercord. 11 Make sure the pump is connected before replacing the cover

1.2 Output control adjustment

Required equipment: Multimeter 0.1% or better, 1 Mohm input resistance or better

* Performance verification

This adjustment should be done when the control board and or the output control potentiometer has been replaced. Measure the voltage between MP1 and MP2 on PCB 7816; it should read between

4.50 and 4.52 Volt with the output control voltage potentiometer in off position ( c.c.w. ).

* Adjustment procedure ( with cover removed )

Set the Output control potentiometer to off in the maximum counter clockwise position. Connect the

to maximum clockwise position.

to maximum clockwise

ADJUSTMENT PROCEDURES Service information Phyaction 787 - Page 1

multimeter between output control potentiometer left hand side and MP1 ( Control board ). Adjust P1 on the control board for a reading between 4.50 and 4.52 Volt.

1.3 Adjustment points 782x Main board

ADJUSTMENT PROCEDURES Service information Phyaction 787 - Page 2

ADJUSTMENT PROCEDURES Service information Phyaction 787 - Page 3

1.4 Adjustment points 781x Control board

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CHAPTER 1 TROUBLE SHOOTING

1.1 General

In the following two chapters 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 error numbers, on the line indicated by "ERROR:" are described in the next chapter on selftest. The number at the "Nr:" line gives in some occasions additional information about the error. The hexadecimal number on the line "Adres:" indicates the program counter position at the occurrence of the error. This is important in case of software errors. In cases the display is (probably) not available the processor will flash the monitor (yellow) led a number of times, description also in the next chapter.

1.2 Selftest

The selftest checks proper functioning of the safety relay and circuits and is activated every time the unit is switched on. The tests are performed by the microprocessor and lasts for approximately 2 seconds. The dosage regulator should be in the zero position (maximum counter clock wise). This is checked at regular intervals during the selftest. If the dosage regulator is not at zero an error will be reported (ERROR 50 or ERROR 54) and an error shutdown procedure will be initiated as described below.

The safety relay driver circuitry is accessible to the microprocessor for 3 seconds after power up of the unit. After this period the microprocessor will not be able to switch the safety relay on any more. The control lines used for test purpose only are only accessible by the microprocessor if the dosage regulator is in the zero position as extra precaution against hard- or software errors.

the processor detects a fault!!

--------------------------------------------- switch off

ERROR: 54 Nr: 12 Adres: 45A0

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1.3 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. This is a latched condition that can only be

reversed by switching off the unit.

- Dummy relay off: The output is short circuited. (This can only occur if the dosage regulator is

at zero).

- Choppers off: No signal to the output stage.

- Dac's to zero: No signal to the choppers

- Red error-LED on

- Fan on

- An error message is displayed on the LCD screen. In some cases the yellow monitor-LED is

pulsed in case the processor has not established communications with the LCD screen yet.

1.4 General test description

The microprocessor gathers its information via digital and analog inputs and these are tested first. Next the safety relay, dummy relay and safety limit circuits are tested. Finally some additional simple tests are performed.

In case the unit does not finish selftest, no error message is displayed, the monitor-LED is not pulsed and all internal wiring is connected properly the following items are suspect :

- Supplies (mains and other)

- Microprocessor

- Program EPROM

- Address, data or control lines

1.5 Microprocessor, analog inputs and supply voltages test

Any errors found will stop the selftest and an error message will be displayed. (or yellow monitor-LED pulsed)

The following tests are performed: 1 Errorline check. If the errorline is in error condition (safety relay switched off) the yellow LED will

be pulsed 7 times.

2 Microprocessor internal register check. Data is written to the internal registers, read back and

compared against the original data. Incase of a failure the yellow LED will flash 4 times (ERROR 20).

3 The microprocessor arithmetic and logic unit (ALU) check. In case of failure also the yellow LED

will flash 4 times (ERROR 20).

4 Data storage test. The RAM is tested for writeabilty and data retention. This also checks

address, data and read/write control lines. Incase of a failure the yellow LED will flash 5 times (ERROR 22).

5 Program storage test. By means of a checksum test on the first 48k (older versions 32k) the

data integrity of the program stored in EPROM is tested. Incase of a failure the yellow LED will flash 6 times (ERROR 21).

6 Bank switch circuit. Incase of a failure the yellow LED will flash 8 times (ERROR 28).

7 LCD display. The processor checks if communications with the display controller can be

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activated. Incase of a failure the yellow LED will flash 11 times fast. 8 Initial power up conditions: ERRORline not activated. If activated ERROR 57 Dosage regulator at zero, checked by means of the potentiometer switch. If not at zero ERROR

50 (check cables if the control is at 0 position) 9 The timers (U22, U24, 8155). The processor starts each timer with a preset time and compares

it against a programmed delay loop with the same time delay. If U22 fails ERROR 31, if U24

fails ERROR 32 10 ADC U17, An reference voltage from U21 (Vref, 2.53 Volt) is converted and checked against a

stored value. A conversion result below 2.39 Volt results in ERROR 30, above 2.63 Volt in

ERROR 37, and if EOC remains high ERROR 38 11 Supply voltages +24V, +15V and -15V through a resistive network. If the summing point of the

resistive network is below 1.16 V or above 3.47 V ERROR 53 is reported. 12 Dosage regulator output signal. This should be at or close to 0. A voltage above 0.2 V results in

ERROR 54 13 Microprocessor interrupt lines 6.5 and 7.5 . Three error messages may occur. ERROR 24 if one

or both lines are active before activated. ERROR 25 if 6.5 does not activate. ERROR 26 if 7.5

does not activate. 14 The bootstrapped supply voltages to the voltage to current converters are checked for

quiescent level, above 6.1 V and below 8 V. A failure on channel A results in ERROR 60 a

failure on channel B in ERROR 70. The error message indicates the converted value.

With the above tests the microprocessor, analog inputs and supply voltages have been tested

1.6 Safety and dummy relay test

In the following test sequence the safety and dummy relay's are tested for proper functioning. No external (patient) connection should exist during this test. The DAC is programmed in such a way that with a test reference voltage applied via the TEST line approximately 2 mA DC will flow through the output circuit, if connected either through an external connection or the dummy relay. The voltage level at the bootstrapped power supply is proportionate to the resistance in the output (patient) circuit with a given current. This level is used to test the output circuit resistance. A voltage on this point below 10.9 V if checking for an open circuit is recognized as an error. A voltage above 8.25 V while testing for a closed circuit is recognized as error.

When the safety relay is energized (on) the contacts in both channels are closed. With the dummy relay will short circuit the output channels if in energized (on) state. The initial condition of the relays prior to test is safety relay off dummy relay on

1 Test if the safety relay is off. A low current (apr. 2 mA) is applied to the output circuit. If a closed

circuit is detected on channel A ERROR 61 will occur, on channel B ERROR 71. 2 Test if errorline becomes activated if the safety relay is switched on. If the error line is activated

it means that the safety circuit has activated it and ERROR 55 will occur. 3 Test if the safety relay makes contact. With the safety relay on and the dummy relay on a

closed circuit should exist. An open on channel A will result in ERROR 62 and an open on

channel B ERROR 72 4 Test for external (patient) connections. When the dummy relay is switched off the output circuit

should be open again. A closed circuit indicates an external connection. ERROR 63 for channel

A and ERROR 73 for channel B. Only the normal outputs are tested, not the vacuum outputs.

5 Test if dummy relay makes contact. After energizing the dummy relay the outputs should be

shorted. If channel A is open ERROR 64 occurs, if channel B is open ERROR 74

If these tests have passed the safety and dummy relay are functioning and no external connections

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exist. In the next test the safety relay is tested under full load conditions. The DAC's are programmed for an output current of 110% maximum operating current. 1 Test if the safety relay switches under full load. When the safety relay is switched on the safety

limit check circuits should activate the errorline causing the safety relay to drop off. If the

errorline is not activated ERROR 65 is generated for channel A and ERROR 75 for channel B.

In both cases the value in the error message is 0 2 Test if the safety relay contacts open. If the above test passes but a closed circuit is detected

(bootstrapped power supply voltage below 20.7 V) the same errors are generated ERROR 65

for channel A and ERROR 75 for channel B. This time however the actual voltage level of the

bootstrapped power supply is given in the error message.

This test completes the verification of the safety relay.

1.7 150% safety limit check

In this test sequence the 150% comparator circuits are tested. The safety relay is energized and a closed output circuit is created by switching off the dummy relay. By programming the DAC two currents are generated one representing a value below 150% (1.5 mA) and one above 150% (8 mA). The limit checks are done on each half of the output stage for each channel. 1 Test with a current below 150% if no error condition is generated. If an error is generated for

channel A ERROR 66 is reported, and ERROR 76 for channel B. The value reported at this test

is 0 2 Test one half of each channel (comparator 1) for 150% limit. If the errorline is not activated with

the 150% current ERROR 66 is generated for channel A and ERROR 76 for channel B. To

distinguish these errors from the previous a value of 1 is reported. 3 Test the other half of each channel (comparator 2) for 150% limit. The error messages are also

ERROR 66 and ERROR 67 for channel A and channel B. The value reported is 2 This completes the verification of the 150% limit check circuits.

1.8 Maximum current safety limit check

This comparator checks for currents above the maximum allowable output current and should report an error if the output current rises above 110% of the maximum allowable. The maximum current is simulated by test lines connected to the comparator network. 1 Simulate normal current with test lines TST1 (channel A) and TST3 (channel B). If the errorline

is activated ERROR 67 will be generated for channel A and ERROR 77 for channel B. The

reported value is 0. This also checks if the 11 Kohm input resistors are installed. 2 Simulate 110% current with TST2 & TST3. If the errorline is not activated ERROR 67 for

channel A and ERROR 77 for channel B is generated. The reported value is 1. This completes the maximum current safety limit (LIMIET) check

1.9 Other tests

Next is the test of the dosage regulator output signal by means of TST5 test line. ERROR 56 is generated if the errorline is not activated. After completion of this test the safety relay is switched on and the dummy relay off.

Next a checksum test of the EPROM is executed. Up to version 2.xx the second bank is tested. From version 3.0 on banks 3, 4 and 5 are tested. If an error is found ERROR 27 is reported with a value equivalent to the bank found at fault.

Finally a test is done at a specific location of the battery backed up RAM. If the data in this location

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does not conform with the test value the RAM has lost data. The message "THE DEFAULT MEMORY IS NOT OK, check the back-up battery, data in memory lost."

For software versions from 3.3 and up some additional tests have been added: 1 Serial bus test. If a test connector, looping the output signal back to the input, is connected to

the serial communication port the message: UART LOOP-BACK CONNECTED, the uart works, please remove the test plug. is displayed if the test passes. No message will be displayed if the test fails or if no test

connector is installed !! 2 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. ERROR 42 for channel A and ERROR

43 for channel B will be generated in case this test fails. The actual measured voltage is

reported with the error message

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1.10 ERROR numbers summary

Processor system and LCD, 10 .. 28

Led on (qty)

Description 4 The processor is in error 5 The 64K bit SRAM is faulty 6 The 512K bit EPROM is faulty 7 The safety-relay is not active 8 The bank switch is not functioning properly 11(fast) The display is not connected/functioning

ERRORnumber

Description 10 .. 14 Software errors, contact Uniphy ! 20 8085 Selftest error 21 Checksum bank 0 error 22 RAM test error 23 TRAP interrupt activated 24 Interrupt line 65 of 75 to early high 25 Interrupt 65 remains low 26 Interrupt 75 remains low 27 Checksum other banks error 28 Bankswitch not functioning

Processor peripherals 30 .. 41

ERRORnumber

Description 30 The EOC output of the ADC stays idle (timeout) (clock running? measure EOC) 31 Timer 1 (U22, 81C55-1) counting to short/long (8155 defect? measure clock input,

measure Tout). 32 Timer 2 (U24, 81C55-2) counting to short/long 34 The SIO not functioning 35 Noise on an input line of port c of U22 (measure). 36 Noise on an input line of port c of U24. 37 The Vref2 input of the ADC is to high/low (measure 2.53V) 38 The EOC input of the ADC stays high 40 ADC timeout during normal use 41 LCD timeout 42 Optocoupler failure channel A 43 Optocoupler failure channel B

Safety-circuit 50 .. 77

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Most safety-circuit messages can only appear at power up of the unit during selftest. During normal use only the temperature, the water reservoir and the error line are checked (message 58, 52 and 51).

The errors 50 to 58 are not limited to one channel.

ERRORnumber

Description

50 Output control not zero during selftest ( a specific message appears on the display

) 51 The error line is activated 52 Water reservoir full ( a water reservoir symbol appears on the display ) 53 Supply voltage incorrect. The sum of the supply voltages should be between 1.1

and 3.4V (ADC channel 5). 54 The output control supply voltage measured by the ADC is not 0V during the

selftest. 55 Error line remains active during selftest; error shutdown is activated 56 Output check not functioning 57 The error line is not active during power up, RESET should activate the line. 58 Temperature of the heatsink to high (check temperature sensor KTY83) the

temperature limits are (7826): 83 degrees C : error message 55 degrees C : fan on 40 degrees C : fan off ( if switched on )

The output of the bootstrapped supply to the U/I convertors is measured with the ADC through a divider network. Some of the error messages give the ADC value on line Nr:. To calculate the measured voltage for VkanA or VkanB divide the reading by 9.2

ERRORnumber

Description A B 60, 70 VkanA/VkanB incorrect. If the choppers are off the value should be around 7V . Nr:

value= DC value VkanA/B

61, 71 Safety-relay not in the correct state (off). Value= ADC value VkanA/B. Because the relay

is open the patient path resistance should be 50K and VkanA/VkanB high at a low current.

62, 72 Safety-relay does not switch. Value= ADC value VkanA/B. Because the dummy relay is

closed (output shorted) the value of VkanA or VkanB should be low with a low current and closed safety relay.

63, 73 Patient connected (special screen). With an open dummy relay and no error the patient

path resistance should be 50 Kohm.

64, 74 Short not functioning. Value= ADC value of VkanA/B. the patient path resistance should

be 0. 65, 75 Safety-relay does not switch at maximum current 66, 76 150% limit check not functioning. Value 0: activated before 150% is reached 1: is not activated with a positive pulse (set chopper flip-flop,

SCHABIT, active)

2: is not activated with a negative pulse (clear chopper flip-flop,

SCHABIT, active) 67, 77 Maximum output limit check not functioning. Value 0: activated before maximum output is reached (line test2/3 active) 1: remains inactive (line test1/4 active) (comparator not

functioning).

Other error numbers

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