Super Spiro MK2 Service Manual
Contents
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8. is controlled by Renesas formally Hitachi HD64F2319 micro controller uC 02 It has in built 512 KByte flash memory and 8 KByte of RAM The flash memory is used for boot loader and kernel whilst the internal RAM is used as a stack only The uC clock speed is set at 24 567 MHz by crystal X1 This clock divides properly for 115K baud rate for serial port Although the USB is the primary interface port the serial port is used for downloading the boot loader and initial board testing Since the uC internal RAM is not sufficient an external 1 MBvte RAM 03 is used for running the modules and data manipulation US is a fairly large flash memory utilised as a flash Disk It stores various modules and data as files The modules are loaded in RAM before executing The data like spirometry records patient information ect Are saved as database files U6 controls read write signals to 05 The reset controller 01 controls the reset to the and the rest of the system If the supply voltage falls below 3 1 it reset the uC The uC can hold itself in ON position despite the user trying to switch itself off using TR1 This is necessary to prevent the system switching off whilst the uC is writing data to the flash disk Similarly it can turn itself off using TR2 for battery saving J3 is the connector to display backlight with power and backlight on off control using TR4 LK1 is shorted to download the boot loader for the first time There after it
9. is not normally used except to load the new updated version of the boot loader Keypad Circuit Drawing 078 12 The keypad is connected as 4 X 4 matrix The software can determine which key is pressed by driving a pattern to one side of the matrix and reading the result The pattern switches on one row and the corresponding result specifies which column the pressed key belongs to Diode arrays D1 and D2 are required to control the matrix There are six dedicated keys for display contrast sound volume paper feed and On Off These keys directly control the hardware and are not software driven LED1 indicates if the battery charger is connected The keypad circuit is a separate board which holds the actual keys It connects to the main board via connector J1 RTC and Kevpad Interface Drawing 078 05 47 connects the kevpad board to the main board 021 is use for generating interrupt if any key is pressed 022 is an RS232 interface chip converting logic 3V3 Rx and Tx line to RS232 level signals It has in built step up and power inverter generating 6V6 It requires capacitors C57 C60 to do this conversion J6 is 9 pin D type RS232 connector It has standard pin outs except for pin 4 which has 3V3 power This could be useful in the future to supply power to an interface board 024 is a Phillips Real Time Clock device It keeps the current time and date When the unit is switched off it is powered from the rechargeable bat
10. the RGB colours For this reason the lighter shades may generate some interference patterns The display pixel information is held in 128 KByte RAM Two display pages A amp B are adopted and the software can select either to display page A or B or mix them together as A amp B A B etc Page B can be horizontally and vertically scrolled by simply writing the offsets This allows display to be scrolled during spirometry tidal breathing test Furthermore the controller has a facility to flash parts of display with programmable on off time period and allow programmable background colours U33 generates 27 V VEE required for the display This voltage can be adjusted by varying the digital variable resistor U34 Modifying the value of the resistor changes the contrast of the display U31 is a touch screen controller which detects if the stylus is pressed on the display and sends an interrupt to uC The uC then reads the A D conversion of the touch screen X Y resistance value to determine the position of the stylus Since the display controller generates high frequency signals care should be taken to ensure that the cable from connector J9 to the display is properly shielded Sounder Circuit Drawing 078 08 uC generates a known frequency which is sent to the audio speaker via an audio amplifier driver U37 This method allows various musical sound to be played through the speaker The audio frequency is passed through digital potential
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12. 04 J5 is a 6 pin RJ422 multi purpose connector Its primary function is to connect to spirometrv turbine but it also used for interfacing with Rint head The power to the interface is via pin 4 which has either continuous 9V from the mains module if connected or 9V from the regulator but can be switched on when required This allows the Rint head internal batterv to be charged if connected to the mains or 9V is controlled under batterv operation Pins 2 and 3 of the connector are turbine outputs or are shared with SPI bus for Rint or other interfaces U15 and U16 are Schmitt trigger which ensures that the turbine pulses are clean U13 is a latch which remembers the signal of pin 3 when pin 2 is triggered These determine if the flow is inwards or outwards In the main uC the SPI port and the RS232 port are shared on the same I O pins The output in RS232 mode also drives the internal printer or can be used for programming the printer uC The selection is done by analogue switches U17 020 Displav Driver Drawing 078 07 The STN 0 25 VGA colour display is entirely controlled by Altera EP1K10 FPGA Normallv the FPGA code is loaded via a serial EEPROM but in this case the uC loads the code on start up The code file is loaded in the flash disk The advantage of this method is that it allows code to be upgraded in the field The STN display can only generate 8 colours by mixing RGB pixels but other shades can be generated by time multiplexing
13. Super Spiro MK2 Service Manual 078 50 Issue 1 0 September 2005 Medical Contents Exploded isometric view Parts list Svstem overview Transducer Disassembiv instructions Re assembly instructions Circuit description Microprocessor circuit Keypad RTC and Keypad interface Printer Driver Power Supply Sensor Interface Display Driver Sounder Circuit USB Driver Circuit Technical support Fault analysis Circuit diagrams System Overview Microprocessor circuit Keypad RTC and Keypad interface Printer Driver Power Supply Sensor Interface Display Driver Sounder Circuit USB Driver Circuit Page 3 Page 4 Page 5 Page 6 Page 7 Page 7 Page 8 Page 8 Page 8 Page 9 Page 9 Page 9 Page 10 Page 10 Page 10 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Exploded Isometric View Parts List ITEM No DESCRIPTION TOP MOULDING BACK PANEL SIDE PANEL BOTTOM MOULDING HINGE BLOCK DISPLAV FRONT DISPLAV BACK DISPLAV HINGE ASSEMBLV SPEAKER SPEAKER COVER SCREW COVER CSK SELF TAPPING SCREW 8mm LONG DISPLAV LATCH DISPLAV LATCH BUTTON PRINTER MECHANISM MICRO MEDICAL PT No MIM 078 22 MIM 078 34 MIM 078 35 MIM 056 12 MIM 056 22 MIM 056 13 MIM 056 14 SPK KDM 40016 MIM 056 21 MIM 056 23 Super Spiro mk2 System Overview Fig 1 The Micro Medical Super Spiro is a data recording spirometer consisting of a microcomputer unit 1 incorporat
14. d be carried out in logical sequence If the fault is still apparent after the following suggestions then the unit should be fault found using the circuit descriptions and circuit diagrams provided When the unit is turned on there is no display present Ensure charger is turned on at the mains FVC readings are low Remove turbine from transducer housing Taking the turbine move it slowly through the air and check that the vane is not sticking The unit does not record any blows Inspect transducer housing connector for damage Check that transducer housing lead is properly connected to the RJ11 socket Remove turbine from transducer housing Taking the turbine move it slowly through the air and check that the vane is not sticking Blow into transducer housing and move transducer head cable around to check for breaks in the cable 8 E wad SOOTS MONTA PAS so0T das L ka 10 8L0 ans OUNIdS 5 asJapunos W ALNIAA ALNRId 8 E pI
15. divider U35 to adjust its amplitude which acts as volume control The fixed up down key varies the potential divider When any key is pressed the U36 mutes the sound to avoid clicking noise The uC and also mute the sound using VOL OFF I O line USB Driver Drawing 078 09 Super Spiro Mk2 has facility to act as a host USB controller or as a slave USB port The host facility is required to drive the USB printers and in the slave mode it communicates with the PC to either send the data or in case of Spida perform live spirometry tests Cypress SL811HST device U39 is used as a USB controller running at 12 MHz for version 1 1 full speed Resistor R79 is switched on in the slave mode to inform the host that it is full speed whilst in host mode R62 is switched on to load the D line via 15K resistor U40 is a 5V voltage regulator supplying power to USB slave device This regulator will only be switched on if the host is not connected and the software activates the USB PWR line Pin 4 of J12 is logic low if connected to the host Technical Support Great Britain and World Headquarters Micro Medical Ltd PO Box 6 Rochester Kent MEI 2AZ Telephone 44 0 1634 360044 Fax 44 0 1634 360055 Web Site http www micromedical com uk Email support micromedical com uk Contact Micro Medical Ltd for the local agent in your region or country for local service Fault Analvsis The following analysis is only a guideline and shoul
16. es On top of this it should work from the internal rechargeable battery or from mains power converter 9 V and should recharge the battery If the mains power is connected the battery output is switched off by TRS All the power to the system is from the mains power module except the on off controller At the same time the battery is charged by power controller U9 which ensures that steady 9V is applied to the battery When the mains power module is not connected then the battery supplies all of the power to the system It also powers the on off JK flip flop which turns on TR6 when on off key is pressed and turns off when the key is pressed again U43 is a rail to rail comparator which ensures that the unit can not be turned on when the battery voltage falls below a minimum level The minimum level is set to ensure that there is always some battery power available to run the real time clock and enough to start the unit The battery voltage mains output unregulated is available as VPRINT for printer motor driver device The rest of the outputs are regulated by SPIC converters LT1613 The main output is 3V3 marked as VCC This is converted by U10 and powers the main uC and most of other devices U8 converts to 2V5 which is required by the display driver FPGA and U7 converts to stable 9V required by the backlight and the printer U14 is a low dropout voltage regulator supplying 5V to the printer controller Sensor Interface Drawing 078
17. ing a 1 4VGA colour LCD display data entry kevpad RS232 serial interface USB interface and all associated circuitry Itis supplied with a digital volume transducer 2 disposable mouthpieces transducer holder 3 and mains adapter 4 The Super Spiro is powered by a universal mains adapter 4 When testing a subject the transducer is inserted into the holder which is plugged into the microcomputer unit The digital volume transducer is used to measure the subjects expired flow and volume in accordance with the operating manual ja E 20000 Micro 00000 Medical 0000 Transducer Fig 2 The Micro Medical digital volume transducer consists of an acrvlic tube with a vane positioned between two swirl plates The low inertia vane is attached to a stainless steel pivot which is free to rotate on two jewelled bearings mounted at the centre of the swirl plates As air is passed through the transducer the swirl plates create a vortex which causes the vane to rotate in a direction dependant upon the direction of airflow The number of rotations is proportional to the volume of air passed through the transducer and the frequencv of rotation is proportional to the flow rate The transducer housing consists of a main bodv that contains a pair of light emitting diodes LED s and phototransist
18. lv The Super Spiro mk2 is now ready for fault finding Reassembling the Superspiro after repairs Main unit Disconnect all mains power supplies Position the top moulding over the bottom moulding and ensure that thev both mate correctiv Place the Super Spiro mk2 face down and insert the six screws Turn the unit face up and connect the mains supply Turn the unit and offer up the paper roll as explained in the operating manual Replace the paper cover The Super Spiro mk2 is now ready for operation Displav console Reconnect the 2 connectors on item 4 to the plugs on the displav ensuring correct polaritv Position the displav over the locating pillars on the displav back panel item 8 Position the displav front panel item 7 over the displav Secure the displav using 4 screws item 16 Replace the 4 screw covers item 15 NEON Circuit Description see 078 01 The Super Spiro mk2 board was designed primarilv to interface with the Micro Medical Spirometer turbine but the interface was kept open ended so that other modules for example airwavs resistance bv the interrupter method Rint can be attached A 9 pin D tvpe connector was designed in to allow customer special modules to be attached and the unit is also USB compatible Provision was given to add a mezzanine board for customer special interface circuitrv to be connected Microprocessor circuit Drawing 078 02 The Super Spiro mk2
19. ors The transducer is fixed to the mouthpiece holder which pushes into the main bodv and is captured bv an O ring seal The LED s produce infra red beams which are interrupted bv the vane twice per revolution This interruption is sensed by the phototransistors The output from the collector of each phototransistor will be a square wave with a phase difference between the two of 4 or 90 degrees depending upon the direction of flow There is no routine maintenance required for the transducer other than cleaning according to the instructions in the operating manual Micro Medical Digital Volume Transducer Rotating Infrared Swirl Jewelled vane emitter plate bearing i Infra red detector Volume k X No of pulses Volume proportional to the number of pulses I Flow proportional to the puse frequency Flow k pulse period Disassembling the Super Spiro mk2 for Repairs Main Unit 1 Disconnect all mains power supplies 2 Remove paper roll and paper roll housing cover and put to one side We recommend that vou use a Philip Number Zero screwdriver for the following instruction 3 Place the Super Spiro mk2 face down to remove the six screws Item 19 the lower moulding and put the screws to one side Turn the unit face up before easing the upper and lower mouldings apart Reconnect mains power supp
20. terv It draws verv little current and therefore can stav on for vears without draining the batterv significantiv U25 is a temperature sensor located on one corner of the board It measures current ambient temperature for inspiratorv calculations U23 is 32 byte EEPOM to store system parameters Most of the system parameters can be stored in the flash disk but some parameters like the calibration values serial number etc are best stored here If the flash disk is formatted these parameters are not lost Printer Driver Circuit Drawing 078 06 The in built thermal printer is controlled by a separate micro controller U26 The uC is a Renesas H3687 Tiny series with 56 Kbyte internal flash and 512 bytes of RAM The uC controls the thermal printer heads and drives the motor to turn the paper U27 is a high power motor controller The interface from main UC is via logic level RS232 Since this uC requires 5V supply the interface signals are converted from 3V3 to 5V by U28 The software to this uC can be upgraded by turning on TR10 and resetting the uC This puts the uC in boot mode and software can be programmed in the internal flash via the serial port VR1 resistance value is read by the uC to control the switch on printer head time This enables lighter darker dots on the paper This is set during production and is not available to the user Power Supply Drawing 078 03 The Super Spiro mk2 requires various power supply for different devic
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