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KeyPad service manual 
Rev.1.1

 

29 

  Monostable verification (74HC123AN 

– U3) 

NOTE: This will also confirm that the CPU is also up and running 

o

  Unscrew the bottom plate by removing the four screws 

holding the feet in place.  

o

  First verify that U3 part number is 74HC123AN.  If not, 

please replace accordingly (see figure 18). 

NOTE: 74HC123N is on older unit only (green display), it must 
be replaced with the same part 

o

  Set the target temperature to 25 

C and target time to 1 min. 

o

  After starting the system, turn the module upside down and 

see if the LED D3 (see figure 17 for position) had a 1 sec. 
lighting time. 

NOTE: The heating block temperature must be lower than the target temperature 
in order for the LED to flash. 

 

 

Figure 17: 

 Heating system LED indicator location 

 

Legend: 

1.  Monostable LED (green)

1 

Содержание DigiPREP HP

Страница 1: ...ion from SCP SCIENCE Patents Pending SCP SCIENCE Canada 21800 Ave Clark Graham Baie d Urfé QC H9X 4B6 Tel 514 457 0701 Fax 514 457 4499 USA 348 Route 11 Champlain N Y 12919 4816 Tel 800 361 6820 Fax 800 253 5549 Europe 12 Avenue du Québec Batiment I 2 Silic 642 91965 Courtaboeuf CEDEX France Tel 33 01 69 18 71 17 Fax 33 01 60 92 05 67 www scpscience com sales scpscience com MANUFACTURED IN CANADA ...

Страница 2: ...on 17 2 2 Digital screen Backlight is not working 18 2 3 Digital Screen LCD is malfunctioning 19 3 KeyPad Malfunction 3 1 Failed KeyPad Buttons 20 3 2 KeyPad Diagnostic Section 21 3 2 1 Entire row or column problem 21 3 2 2 Specific Button Problem 22 4 Power Section 4 1 The controller is not functioning when power switch is on 24 5 Heater and Monostable Section 5 1 DigiPREP block is not heating up...

Страница 3: ...7 8 2 DigiPREP MS Block description 38 8 3 DigiPREP HP Block description 39 8 4 DigiPREP HT Block description 40 8 5 Heater verification 41 8 5 1 DigiPROBE error 42 8 5 2 Heater is not heating up 42 9 Part lists 9 1 Controller major part list 44 9 2 Heating block major part list 45 10 Service Departement SCP SCIENCE 46 11 Index Figures 47 12 Electrical Schematic DigiPREP KeyPad 48 ...

Страница 4: ...ovide service for any DigiPREP digestion system sold by the distributor in the territory a Warranty Period Service parts required during the warranty period shall be provided to distributor at no charge Freight costs for the service parts shipped to the distributor will be borne by SCP SCIENCE Transportation costs for returned instruments and parts are the responsibility of the distributor Labour ...

Страница 5: ...nt of the product 7 An RMA is required prior to returning any item to SCP SCIENCE 8 SCP SCIENCE shall not be responsible for any damage or losses however caused which may be experienced as a result of the installation or use of this product 1 1 ERROR MESSAGES Some of these error messages will not appear on older equipment 1 DigiPROBE ERROR ensure the DigiPROBE or the DigiPROBE Dongle is installed ...

Страница 6: ..._____________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________ 2 Display Touch Screen or LCD Backlight is working Banner Screen is appearing Main menu screen is appearing Fonts and ...

Страница 7: ..._______________________________ 4 Heater and Monostable Circuit DigiPREP block is connected into the controller DigiPREP block is heating accordingly COM2 dongle is correctly inserted DigiPROBE is correctly inserted into its socket Comments and observations ________________________________________________________________ ________________________________________________________________ ____________...

Страница 8: ...osition see section 8 Ensure the correct system is chosen on the utilities menu 4 No display but back light is lit Ensure the Voltage Selector Switch is at the appropriate voltage 5 No display and no back light Check fuse F1 Symptoms Reference Operation LED not illuminated blue when power is on Section 2 1 Section 7 2 Digital Screen Backlight is not working Section 2 2 Section 7 3 Digital Screen L...

Страница 9: ...connected 4 Ensure that the block is connected and that the connector is twisted and locked into the receptacle 5 Wait for 30 seconds 6 Press and hold the key while turning the power back on 7 The DigiPREP KeyPad controller will emit up to 5 diagnostic beeps The beeps can be short __ or long ________ in duration Listen and record the length on the following chart Record Beep Pattern 1st 2nd 3rd 4t...

Страница 10: ...le 5 Power Cord Receptacle Receives the female end of the power cord 6 Power switch On Off switch with circuit breaker 7 DigiSET Connector COM2 connection port for DigiSET DigiSET will automatically shut off the digestion block when a pre set sample volume is reached DigiSET dongle must be installed to run any DigiPREP block without the DigiSET option 8 Voltage selector switch Selects appropriate ...

Страница 11: ... wall receptacle This banner screen will change to the Menu screen after a 5 second delay 1 6 1 Set Up Menu The Menu screen allows for operating the system or changing the menu language Alarm button Audible alarm On or Off button LED flashes with alarm On selection Target Temperature button Press to modify or change Target Temperature Target Time button Press to modify reinstate or change Target T...

Страница 12: ...r to the Operation mode Press 1 6 4 Setting Operating Temperature Enter the required Target Temperature Target Temperature is the required operating temperature To change the Target Temperature use the numeric keypad and over write with the desired value Press Caution The maximum digestion temperature for polypropylene tubes is 130 C If higher digestion temperatures are required use the appropriat...

Страница 13: ... to maintain the block at the previously set Target Temperature at the end of the Target Time Press 1 6 7 Alarm Mode Press the Alarm Button to turn on the alarm AL will be displayed to indicate the alarm is on A second press of the button will toggle the Alarm off The timer will sound an audible alarm if the alarm is selected To reset the timer alarm press the Target Time button to return to the T...

Страница 14: ...ual Rev 1 1 14 Figure 4 KeyPad display mounting view Legend 1 Rounded Head Nylon Screw 6 32 x 1 2 On Off Switch 3 Dongle 2 Pin Female 4 Panel Lock Nut 5 Panel Mount Connector 7 Pin Male 6 Panel Mount Connector 2 Pin Male ...

Страница 15: ...Nylon Screw 6 32 X 1 8 Voltage Selector Switch 9 Flat Washer Nylon 6 Screw 10 LED 11 Nylon Nut 6 32 12 Stud 6 32 13 Brass Insert 6 Screw 14 LCD 15 Fish Paper 16 Nylon Stand off 6 32 x 17 Bottom Kydex 18 Feet 19 Pan Phillips Head Tapping Screw 8 x ...

Страница 16: ...o DIGITAL CONVERSION POWER MODULE HEATER CIRCUIT CPU Module KEYPAD 5V to all circuit AC To Heater Ext CNTRL DATA RTD SENSOR Signal_ Out Selector LCD Display DATA Figure 5 General KeyPad block diagram The KeyPad controller system is composed of a keypad to enter information regarding set point temperature and controlling time to a CPU which controls the DigiPREP block Jr MS HP or HT A diagnostic te...

Страница 17: ...al set at 230 volts when it leaves the factory 2 1 Operation LED not illuminated blue when power is on Ensure the power cord is fully inserted into its socket see Figure 1 Verify that the power switch is in position ON Remove the bottom plate by removing the four feet and verify that the front LED is connected to connector SP see figure 6 for detail Figure 6 LED cable position Legend 1 Connector S...

Страница 18: ...2 2 Digital Screen Backlight is not working Remove the bottom plate by removing the screws holding the feet Verify that the backlight cable is fully inserted or connected to the Backlight connector see figure 7 for detail Use a multimeter to measure R4 and see if it is 22 ohms Figure 7 Backlight and R4 location Legend 20 Backlight 21 R4 22 ohms Please refer to the following section before changing...

Страница 19: ...ange character are displayed o Replace the LCD monitor After 5 second the user should see the following If not remove the bottom plate by removing the 4 screws holding the feet in place and verify that the LCD ribbon cable is fully inserted into the U1 connector see figure 8 for detail Figure 8 LCD display ribbon cable position Legend 1 U1 LCD ribbon Cable If the LCD display is still not working p...

Страница 20: ...Shif t L R11 R12 R13 R14 R16 R18 R19 R20 Figure 9 KeyPad electronic diagram 3 1 Failed KeyPad Buttons NOTE Please write down each failed button number in order to see if the problem is for a complete row or column In order to verify the buttons please reset the KeyPad controller ON OFF and select the Operation section in the main MENU A target temperature is now asked First verify all digits Every...

Страница 21: ...sed to do o ALARM A small AL should appear on the LCD display o TARGET TEMPERATURE The target temperature menu should appear o TARGET TIME The target time menu should appear 3 2 KeyPad Diagnostic Section 3 2 1 Entire row or column problem If all buttons in a row or column are failing with the helps of figure 9 identify the corresponding pull up resistor o Remove the CPU board from the main PCB o M...

Страница 22: ...roblem If only different row or column buttons are in trouble o First verify the impedance of the button see figure 11 by measuring between 1 and 2 of each faulty buttons Pushed almost 0 0hms Not pushed more than 9 2k o Unscrew the whole PCB from the box o Verify the soldering of this particular button on the bottom side of the PCB 1 2 3 4 5 6 7 8 ...

Страница 23: ... Button 2 4 Button 1 5 Temperature setting button 6 Button 6 7 Button 5 8 Button 4 9 Time setting button 10 Button 9 11 Button 8 12 Button 7 13 ENTER button 14 Right shift button 15 Button 0 16 Left Shift button 17 Positive probe position 18 Negative probe position 10 11 12 9 14 15 16 13 6 7 8 5 2 3 4 1 17 18 ...

Страница 24: ...r switch is at the correct position before powering the controller see Figure 2 4 1 The controller is not functioning when power switch is on o Ensure the power cord is fully inserted into its socket see Figure 2 o Unscrew the bottom plate and verify the fuse F1 see figure 13 for parts location Replace by a 0 5A if necessary AWG 1 fuse 1 4x1 o Verify all the power cables connections see figure 12 ...

Страница 25: ...nd 9 5V AC Please see the schematic for detail If there is no power then make sure that the fuse is fine and change the transformer Measure the DC level at the regulator input U2 should be between 9 5V and 10 5V between pin 1 and 2 If no power comes out of the bridge of diode then verify the diodes integrity and change the faulty one Measure the DC level at the regulator output U2 should be betwee...

Страница 26: ...KeyPad service manual Rev 1 1 26 Figure 14 Diodes and regulator location Legend 1 Diode 1 2 Diode 5 3 Diode 2 4 Diode 4 5 U2 pin 3 6 U2 pin 2 7 U2 pin 1 1 2 3 4 6 7 5 ...

Страница 27: ...he heating block is correctly inserted on both sides Verify that the voltage selector of the heating block is properly set 5 1 2 COM2 dongle verification only if available NOTE When the COM2 of the KeyPad controller is not connected to a DigiSET system the port must be shorted with supplied DigiSET Dongle o Make sure that section 1 and 2 have been verified before continuing o Ensure that the DigiS...

Страница 28: ...B 5 1 4 DigiSET verification only if available Make sure that the DigiSET is fully functional and that the voltage selector is properly set see DigiSET operation and service manual 5 1 5 SSR and Monostable circuit verification Fan verification o If the SSR case temperature is going too high more than 85 C then the fan is not working well The SSR is probably also defective Verify if the fan is runn...

Страница 29: ...rdingly see figure 18 NOTE 74HC123N is on older unit only green display it must be replaced with the same part o Set the target temperature to 25 C and target time to 1 min o After starting the system turn the module upside down and see if the LED D3 see figure 17 for position had a 1 sec lighting time NOTE The heating block temperature must be lower than the target temperature in order for the LE...

Страница 30: ...LED If nothing is coming on pin 9 of the U3 chip the CPU section is in trouble Please refer to the CPU section for more detail o If there is a signal on pin 9 of U3 and the block temperature is below set point temperature and the LED is not blown then change the Multivibrator Figure 18 Monostable pin location U3 Legend 1 T2 SSR testing point 2 Q3 3 U3 pin 12 4 U3 pin 9 5 Analog Ground Q3 switch bi...

Страница 31: ...verification o The only way to see if the SSR is behaving accordingly is by measuring between QD6 and QD5 see figure 19 for location Make sure that there is 120V 230V AC Toggling or not Also refer to figure 19 for an example of what can be seen on a scope if the control is toggling o Make sure that the heating block temperature is lower than the target temperature if you want the SSR to toggle NOT...

Страница 32: ...d service manual Rev 1 1 32 0 Volt Figure 20 SSR output when heating section is firing NOTE if all of those tests are correct please refer to the DigiPREP heating Block section for more detail see section 8 ...

Страница 33: ...s functional before looking at the converter circuit This can be accomplished by measuring the resistance across pin 1 and 2 of connector of the DigiPROBE o Typical 25 C 108 ohms If the display is printing DigiPROBE error then the A D can be faulty but make sure that the section 8 has been verified before changing the A D 6 1 1 RTD input connection Visually inspect the external connection of the D...

Страница 34: ... Y1 component is oscillating at the correct frequency which is 4 9152MHz see figure 22 for part location Figure 22 A D Oscillator and regulator location Legend 1 U9 pin 16 2 U9 pin 15 3 U7 5V regulator 4 Y1 4 9152 MHz oscillator 6 1 3 A D conversion behavior Before changing the A D make sure that all the external instruments sensors probe etc and interconnection cables are not broken Replace the A...

Страница 35: ...U daughter card 2 Battery backup If any of the sections 1 to 4 has been verified and a CPU problem is suspected then try the following sections 7 1 CPU board insertion If a long and clear sound is heard when powering up the KeyPad System Make sure that the power switch is OFF before doing the following item Fully insert the CPU daughter card on the mother board See section 1 4 for more detail on C...

Страница 36: ...tup must be reentered if the battery is bad 7 3 LCD Display problem If the section 1 has been fully investigated and the system is always returning to the default setup EN language default heating block type etc then replace the on board battery You can check the battery by turning off the instrument off for about 5 min Turn it ON and see if the info set is still unchanged system language block te...

Страница 37: ...ceptacle On Off switch contains circuit breaker and receives the female end of the power cord 4 DigiSET Connector Connection port for DigiSET DigiSET will automatically shut off the digestion block when a pre set sample volume is reached DigiSET dongle must be installed to run DigiPREP Jr without the DigiSET option 5 DigiPREP Controller DigiPREP Jr is designed to be used with DigiPREP KeyPad or To...

Страница 38: ...d to run the DigiPREP MS without the DigiPROBE option 2 Cable Connector Connection port for the DigiPREP MS umbilical cable to controller 3 Power Switch Power Cord Receptacle On Off switch contains circuit breaker and receives the female end of the power cord 4 DigiSET Connector Connection port for DigiSET DigiSET will automatically shut off the digestion block when a pre set sample volume is reac...

Страница 39: ... must be installed to run the DigiPREP HP without the DigiPROBE option 2 Cable Connector Connection port for the DigiPREP HP umbilical cable to the controller 3 Power Switch Power Cord Receptacle On Off switch contains circuit breaker and receives the female end of the power cord 4 DigiSET Connector Connection port for DigiSET DigiSET will automatically shut off the digestion block when a pre set ...

Страница 40: ...8 4 DigiPREP HT Block Description 1 Exhaust Manifold Module 2 Dual Zone Tube Rack 3 DigiPREP Controller DigiPREP HT is designed to be used with DigiPREP Touch Screen or KeyPad controller Sold separately 4 Umbilical Cable to connect to controller 5 Glass Digestion Tubes 40 100 ml glass tubes or 20 250 ml glass tubes are included with the DigiPREP HT 5 1 4 2 DigiPREP HT Digestion Block 3 ...

Страница 41: ...r general diagram Heating Pad Controller EX EX M M AC Neutral AC Hot GND Earth Thermal Switch 180degC Jr MS HP or gaz switch HT DigiPROBE Conn RTD PROBE to metal support and graphite block 1 2 3 4 Dongle for internal RTD 1 2 3 4 M M GND Hot N Ex Ex 1 2 3 4 5 6 7 Figure 24 Heater general diagram ...

Страница 42: ...version Make sure you use the right one according to the heater version you have S N 057 Probe 010 505 015 S N 057 Probe 010 505 115 yellow stripe The new probe won t work with an old heating block but an old probe will work with new block 8 5 2 Heater is not heating up Ensure that the umbilical cord is fully inserted into the controller Verify that the thermal switch inside the block is close and...

Страница 43: ...ts Legend 1 Thermal Switch 180 C 2 Voltage selector 115V 230V 3 Heater pad 4 Graphite block 5 RTD thermal sensor Models Voltage Resistance DigiPREPHP 230 V 115 V 30 60 DigiPREP Jr 230 V 115 V 50 100 DigiPREP HT 230 V 20 Figure 27 Heating pad resistance 5 2 1 4 3 ...

Страница 44: ...or NPN 2N3904 2N3904 E310 Resistor 22 ohm 1Watt RSF100JB 22R E311 Resistor 4 7k c ohm 1 8 w CFR 12JB 4K7 E318 Switch Tack c Switch TL1105LF160Q E321 Transformer Dual 8vac 30a 3FD 316 E324 LCD Character Display C 51505NFJ SLW AC E325 Voltage Regulator 5Volt UA7805KC E326 Monostable multivibrator MM74HC123AN E329 CPU module 101 0383 E330 Solid State Relay 240VAC 25 amp PF240D25 E331 Voltage regulato...

Страница 45: ...Number W137 Thermo Fuse with 12 Black Si Leads 75M180NC C176 RTD S17624PDXT40B E239 Voltage selector switch 83710030 E767 Jr MS HP HT Umbilical cord with connector and strain relief E391 MS HP Heater Dual Voltage M20612RG04 E667 Heater HT for 100 and 250 TF 100 93 1 E353 Jr Heater 115 230 48 Lead UL 075109500 ...

Страница 46: ...his information before returning the product This will help our technicians determine the cause of the malfunction more quickly SCP SCIENCE Within North America Outside North America Tel 800 361 6820 Tel 514 457 0701 Fax 800 253 5549 Fax 514 457 4499 Europe SPIN DIVISION Tel 33 01 69 18 71 17 Fax 33 01 60 92 05 67 ...

Страница 47: ...ng location 23 Figure 12 AC DC converter 24 Figure 13 Power connections 25 Figure 14 Diodes and regulator location 26 Figure 15 Monostable and solid state relay circuit 27 Figure 16 DigiSET connector location 28 Figure 17 Heating system LED indicator location 29 Figure 18 Monostable pin location U3 30 Figure 19 SSR test pins location 31 Figure 20 SSR output when heating section is firing 32 Figure...

Страница 48: ...KeyPad service manual Rev 1 1 48 ...

Страница 49: ...KeyPad service manual Rev 1 1 49 ...

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