SCP SCIENCE DigiPREP Series User manual

KeyPad service manual
Rev.1.1
1
Copyright 2003 by SCP SCIENCE
All Rights Reserved
This manual contains proprietary information, which shall not be reproduced or
transferred to other documents or disclosed to others without prior written
permission from
SCP SCIENCE.
Patents Pending
SCP SCIENCE
Canada: 21800 Ave. Clark Graham, Baie d’Urfé, QC H9X 4B6
Tel: [phone] Fax: [phone]
USA: 348 Route 11, Champlain, N.Y. 12919-4816
Tel: [phone] Fax: [phone]
Europe: 12 Avenue du Québec, Batiment I 2 Silic 642
91965 Courtaboeuf CEDEX (France)
Tel: [phone] Fax: [phone]
www.scpscience.com
[email protected]
MANUFACTURED IN CANADA
CERTIFIED TO
CSA 1010 .1
UL 3101-1
IEC 1010-1

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TABLE OF CONTENTS
1.Introduction
Warranty.................................................................................................4
1.1 Error Messages ................................................................................5
1.2 Basic verification list .........................................................................6
1.3 Symptoms.........................................................................................8
1.4 DigiPREP KeyPad Automatic Diagnostics Test Procedure ..............9
1.5 Controller Physical Description.......................................................10
1.6 Instrument Operation......................................................................11
1.6.1 Set-Up Menu................................................................................11
1.6.2 Language Selection.....................................................................12
1.6.3 Set-Up Menu................................................................................12
1.6.4 Setting Operating Temperature ...................................................12
1.6.5 Setting the Timer .........................................................................13
1.6.6 Programming Heater Shut Down.................................................13
1.6.7 Alarm Mode .................................................................................13
1.7 Controller General Description........................................................16
2.Light Emitting Diode (LED) & LCD
2.1 Operation LED not illuminated (blue) when power is 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...................................................27
5.1.1 DigiPREP connection verification ................................................27
5.1.2 COM2 dongle verification (only if available).................................27
5.1.3 Internal wiring connection verification..........................................28
5.1.4 DigiSET verification (only if available)..........................................28
5.1.5 SSR and Monostable circuit verification ......................................28
6.A/D Converter
6.1 Possible A/D problem.....................................................................33
6.1.1 RTD input connection..................................................................33
6.1.2 A/D power and connections.........................................................34
6.1.3 A/D conversion behavior..............................................................34

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7.CPU Section
7.1 CPU board insertion .......................................................................35
7.2 Power LED malfunction..................................................................36
7.3 LCD Display problem......................................................................36
8.DigiPREP Blocks
8.1 DigiPREP Jr. Block description.......................................................37
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

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1. Introduction
This manual is to be used by distributors and employees of SCP SCIENCE
only. The DigiPREP KeyPad Controller is used to control the DigiPREP Digestion
Systems (Jr, MS, HP, HT). Operation details of the KeyPad can be found in the
DigiPREP Digestion System operation manuals or older KeyPad instruction
manuals (see references page). Those details are also included into this
document.
WARRANTY
Warranty and service for DigiPREP digestion systems
SCP SCIENCE warrants this product free from defect in workmanship and
materials for one (1) year from date of purchase.
SCP SCIENCE agrees to make every effort to supply products in merchantable
condition and free from defects.
1. The warranty period for DigiPREP digestion systems is 12 months from
the date of shipment from SCP SCIENCE.
2. DigiPROBE and DigiSET Probe are consumable products and carry a
warranty only to the extent that they are functional on receipt.
3. As part of the Agreement between SCP SCIENCE and the Distributor, the
(distributor) agrees to assume the responsibility to provide 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 for repairs during the
warranty period or post warranty period are the responsibility of the
Distributor
b. Alternative Service: In the event that the distributor wishes SCP
SCIENCE to perform repair service on their behalf, the distributor
shall return the instrument prepaid to the designated SCP
SCIENCE Service Center. Charges for labour required to complete
the repairs will be chargeable to the distributor at SCP SCIENCE’s
current rates. Parts required in the post warranty period will be
charged according to the prevailing Service Parts Price List less
distributor’s discount. Transport charges for the instrument to be
returned are the responsibility of the distributor.
c. Post Warranty Period: SCP SCIENCE agrees to supply required
service parts at prices according to the prevailing Service Parts
Price List less distributor’s discount. The distributor agrees to pay

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freight charges for service parts purchased after the warranty
period.
4. SCP SCIENCE reserves the right to request that failed parts be returned
to a location specified by SCP SCIENCE, in which case freight charges
shall be borne by (distributor). This clause shall apply irrespective of
whether the unit is under warranty or not.
5. A DigiPREP digestion system that does not operate upon receipt (‘out-of-
box failure’) may be returned to SCP SCIENCE with transport charges to
the account of SCP SCIENCE. Note that the distributor must obtain a
Return Authorization number from SCP SCIENCE before shipping the
instrument. SCP SCIENCE reserves the right to select the method of
transport.
6. (Distributor) agrees to cooperate in all respects with SCP SCIENCE and
will provide SCP SCIENCE with service failure information, serial numbers
of the digestion block and/or controller, and any other service related
information determined by SCP SCIENCE as being relevant to the repair
of an instrument and to the improvement 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 correctly.
2. Over Temperature Protection - the block is over heating the set point
temperature check the SSR section 3
3. Temperature Dropping - DigiPROBE is no longer in the solution and
could be measuring vapor temperature.
4. Check DigiPROBE and DigiSET Dongle - The set point temperature has
not been reached. But steady state has been reached.
5. Steady State Error. The system is detecting a constant temperature but
has not reached set point temperature.
6. Temperature Unsteady –the DigiPROBE appears to be sensing a
variation in temperature typical caused when the DigiPROBE is or is about
to become out of the solution due to evaporation.
7. Set point Exceed Sample Boiling Point –Verify the set point entered.
Note: Any of these error messages will be eliminated upon the pressing of any
key. Elapsed time is not interrupted in this sequence.

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1.2 Basic verification list
1. Visual and physical inspection
All parts are included (see section 1.5)
Voltage selector is at the right position (both block and controller)
Power cord is fully inserted
All connectors and cables are inserted accordingly
The system powers up correctly
Cable connector look fine (not bent)
Comments and observations:
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________
2. Display
Touch Screen or LCD Backlight is working
Banner Screen is appearing
Main menu screen is appearing
Fonts and video color is correct
Keypad display has clear black letters
Comments and observations:
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________

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3. Power Supply
The Fuse is fine
Power cables are correctly inserted (see section 3)
Comments and observations:
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________
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:
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________
5. CPU and general component verification
The CPU daughter card is fully inserted
The backup battery is functional
Software runs accordingly
Controller serial number _______
Software version _______

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1.3 Symptoms
The following symptoms must be verified before going into more detail (see
figure 1).
1. The block is over shooting the set point temperature, and the temperature
keeps climbing.
Check the SSR Relay section 3.1.5
2. The block is not heating
Ensure the DigiSET Dongle is installed.
The power cable is connected correctly.
Ensure the Voltage Selector Switch is at the appropriate voltage.
Verify that the 180oC NC Thermal Switch is closed (see block service
manual)
Check resistance of heater (115 v –65 ohms or 230v –32 ohms)
3. The block is heating very slowly
Ensure that the voltage selector switch is at the correct position (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 (LCD) is malfunctioning
Section 2.3
Section 7.3
LCD shows “DigiPROBE error”
Section 6.1
Section 8.5.1
Keypad buttons are not functioning correctly
Section 3
The controller is not functioning when power switch is on
Section 4.1
The DigiPREP block is not heating up
Section 5
The heating block is not reaching its temperature or vary
Section 6
A long and clear sound is heard when controller is powered up
Section 7.1
Figure 1: Symptoms vs. document references

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1.4 DigiPREP KeyPad Automatic Diagnostics Test Procedure
The CPU is able to perform an automatic diagnostic test. Follow the 7 simple
steps below.
1
Shut off power to the DigiPREP KeyPad.
2
Ensure voltage selector is switched to the correct position. NOTE: The selector
switch shows the voltage selected in white text.
3
Ensure that the DigiPROBE is installed, and inserted into either the block, or
the sample. If you are not using a DigiPROBE, ensure that the dongle is
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
4th
5th
Compare the beep pattern recorded above to the chart below.
BEEP
Pattern
1st
2nd
3rd
4th
5th
Description
A
_
_
_
_
_
Normal boot
B
_
_
_________
_
_
Low battery /
Memory Failure
C
_
______
KeyPad Failure
D
_
_
_
A/D failure
E
_
_
_
_
LCD failure
F
(Continuous)
CPU error #1
G
(No beeps)
CPU error #2

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1.5 Controller Physical Description
Figure 2: DigiPREP KeyPad controller physical diagram
1. LED –Visible indication that DigiPREP KeyPad Controller is powered-up.
2. Digital Display Screen (LCD)
3. KeyPad –Input all data into controller.
4. Cable Connection –Connection port for the blocks umbilical cable.
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 voltage (115V or 230V).
I.E.: If 115 V is visible then 115 V has been selected.
1
2
3
6
5
4
7
Detachable Power Cord
8
DigiSET dongle

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Figure 3: KeyPad Layout
1.6 Instrument Operation
With the power switch in the off position on the controller, connect DigiPROBE to
the back of the heating block unit. (see figure 2) Connect the block umbilical
cable to the controller. Connect the power cord to the back of the controller. You
are now ready to plug the system into the appropriate 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 Time”.
Enter key: Press to accept value(s).
Left arrow key: Move the cursor to the left.
Right arrow key: Move the cursor to the right.
SCP SCIENCE
DigiPREP Jr.
MENU
OPERATION UTILITIES

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Using the <or >keys move the blinking curser to the ‘Operation’ mode or the
‘Utilities‘ mode Press 
1.6.2 Language Selection
Using the <or >keys move the blinking curser to the language of choice. The
menu commands will then appear in the selected language. Press 
1.6.3 Set-Up Menu
Return to Main Menu to set operation parameters.
Using the <or >keys move the blinking curser 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 appropriate glass or Teflon replacement tubes. A full listing of
available tubes is located on Page 17.
CAUTION
TARGET TEMPERATURE?
25 TO 180 XXX.X C
UTILITIES VER X.X
EN FR DE IT ES
MENU
OPERATION UTILITIES

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1.6.5 Setting the Timer
Enter the required ‘Target Time’ (minutes). The Target Time is the required time
at the designated Target Temperature. To change the Target Time, use the
numeric keypad and over write with the desired value.
Press 
1.6.6 Programming Heater Shut Down
Select ‘OFF’ to turn the heater off at the end of the Target Time. Select ‘ON’ if
you wish 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 Timer
screen and enter a new Target Time. Continue to follow the previous instructions
mentioned above.
TARGET TIME?
0 TO 999 XXX
END OF TIME?
HEATER OFF ON
TEMPERATURE 95.0 C
TIME 120:23 AL

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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

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7. Flat Head 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 ¼”
17.Bottom Kydex ¼”
18.Feet
19.Pan Phillips Head Tapping Screw #8 x ¾”

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1.7 Controller General Description
The following figure shows a general block diagram of the KeyPad controller and
all the interaction between components. Each part will be explained in detail in a
different section of the document.
ANALOG toDIGITAL
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 test procedure is available and
will be discussed in CPU diagnostic section.

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2. Light Emitting Diode (LED) & LCD
Ensure the voltage selector switch is set at the proper voltage for your location
before powering the controller (see Figure 2). It is typical 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 SP
1

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If the LED is not lit, please refer the Power Circuit section and the CPU section
before changing the LED.
NOTE: Ensure that the LED has not been connected in reverse, positive to
negative.
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 the LCD display.
1
2

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2.3 Digital Screen (LCD) is malfunctioning
Make sure that the voltage selector switch is set to the right
position (see figure 2)
With the system powered up, verify that the following message
is appearing for 5 seconds on the LCD screen:
If the startup message is not appearing or strange character are
displayed
oReplace 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, please refer to the CPU section before
changing the digital screen.
SCP SCIENCE
DigiPREP
MENU
OPERATION UTILITIES
1

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3. KeyPad Malfunction
The KeyPad is made of 16 independent switches. The information of a pressed
button is sent to the CPU with help of a row and column detector. One should
feel a ‘click’ upon pressing a button. If there is no click then the PCB board
adjustment should be checked.
+5V
4.7K4.7K
4.7K4.7K
4.7K
4.7K
4.7K
4.7K ROW1
ROW2
ROW3
ROW4
COL1 COL2 COL3 COL4
Alarm 3 2 1
Temp 6 5 4
Time 9 8 7
Enter Shift R 0Shift 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 time you press a button, you should see the
corresponding number under the cursor.
When it is done and all digits are fine, enter 25.0 and press the ENTER key.
Enter “1” in the “Target Time” menu and press ENTER key.
Now its time to verify the ARROW keys.