SCP SCIENCE DigiPREP Series,DigiPREP HT,DigiPREP Jr.,DigiPREP HP,DigiPREP MS Service Manual
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: (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
CERTIFIED TO
CSA 1010 .1
UL 3101-1
IEC 1010-1
KeyPad service manual
Rev.1.1
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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
KeyPad service manual
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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
KeyPad service manual
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5
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-ofbox 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
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
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.
Figure 1: Symptoms vs. document references
KeyPad service manual
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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
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
1.4 DigiPREP KeyPad Automatic Diagnostics Test Procedure
The CPU is able to perform an automatic diagnostic test. Follow the 7 simple
steps below.
Compare the beep pattern recorded above to the chart below.
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1.5 Controller Physical Description
1 2 3 6 5 4 7
Detachable Power Cord
8
DigiSET dongle
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.
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1.6 Instrument Operation
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
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.
KeyPad service manual
Rev.1.1
Figure 3: KeyPad Layout
12
Using the < or > keys move the blinking curser to the ‘Operation’ mode or the
CAUTION
TARGET TEMPERATURE?
25 TO 180 XXX.X C
UTILITIES VER X.X
EN FR DE IT ES
MENU
OPERATION UTILITIES
‘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.
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1.6.5 Setting the Timer
TARGET TIME?
0 TO 999 XXX
END OF TIME?
HEATER OFF ON
TEMPERATURE 95.0 C
TIME 120:23 AL
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.
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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
ANALOG to 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
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.
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.
KeyPad service manual
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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
KeyPad service manual
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If the LED is not lit, please refer the Power Circuit section and the CPU section
1
2
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.
KeyPad service manual
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2.3 Digital Screen (LCD) is malfunctioning
SCP SCIENCE
DigiPREP
MENU
OPERATION UTILITIES
1
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
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)
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.
KeyPad service manual
Rev.1.1
Figure 8: LCD display ribbon cable position
20
3. KeyPad Malfunction
+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 Shif t R
0
Shift L
R11 R12 R13 R14
R16
R18
R19
R20
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.
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.
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o Press the LEFT ARROW key a couple of time and see if the cursor
switched from ON to OFF and so on.
o Press the RIGHT ARROW key a couple of time and see if the
cursor switched from ON to OFF and so on.
Select HEATER OFF and press ENTER (Make sure that a DigiPREP is
connected
Enter a time scale of 1 minute and press enter
Press the ALARM, TARGET TEMPERATURE and TARGET TIME button one
at a time and verify if they are correctly doing what they are supposed 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 Measure with a multimeter the value of the corresponding resistor.
o If it is 4.7K, try to verify the connection (soldering) between the
VCC and the resistor.
o Then check if the resistor is also connected to each button
corresponding to its row or column (see figure 10 for resistors
location)
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Figure 10: Keypad resistors location
1
2 3 5 6 7
8
Legend:
1. R16
2. R11
3. R18
4. R12
5. R13
6. R14
7. R19
8. R20
3.2.2 Specific Button Problem
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.
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10
11
12
9
14
15
16
13
6
7
8
5
2
3
4
1
17
18
Figure 11: Push button measuring location
Legend:
1. Alarm button
2. Button #3
3. 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
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4. Power Section
D4
D5
D1
D2
AC
2200uF
5V
regulator
0.1uF
5V
1
2
3
+
FUSE
The power section is rectifying and regulating power for all different parts of the
KeyPad Controller. It is mainly composed of a transformer, a bridge diode and a
DC regulator.
Figure 12: AC/DC converter
Ensure the voltage selector 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 (1/4x1¼)
o Verify all the power cables connections (see figure 12 for detail):
Green wire connected with QD3
Pin 3 of the power switch is connected to QD1
Pin 4 of the power switch is connected to QD2
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Legend:
1
2
3
4
1. FUSE, 05A AWG
2. QD3
3. QD2
4. QD1
o Use a multimeter to measure the following voltages (see 14 for parts
location):
Figure 13: Power connections
Locate diode D4 and D1 cathodes and measure the
transformer output power between D4 cathode and D1
anode (should be between 8V and 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 between 5V and 5.5V between pin 2 and 3).
If no power is at the regulator output, then
change the regulator U2.
KeyPad service manual
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Legend:
1 2 3 4 6 7 5
1. Diode 1
2. Diode 5
3. Diode 2
4. Diode 4
5. U2 pin 3
6. U2 pin 2
7. U2 pin 1
Figure 14: Diodes and regulator location
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5. Heater and Monostable Section
Monostable
Multivibrator
Solid State Relay
AC
To Heater
Vdd
R7
R7
R7
Jumper
(shorted or to
DigiSET)
from CPU
R8
C5
/Q
Q
Trigger input
Pin 12
Base
Frequency
Setting
COM2
This circuit controls the heater inside all types of DigiPREP Blocks. It consists of
a Solid State Relay, a Monostable Multivibrator and protection circuit.
Figure 15: Monostable and solid-state relay circuit
5.1 The DigiPREP Block is not heating up
5.1.1 DigiPREP connection verification
Ensure that the cable between the KeyPad controller and the 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 DigiSET dongle is fully inserted into COM2 port
(see Figure 2).
o If so, before removing the bottom plate, verify with a multimeter that
o If the dongle is ok, remove the bottom plate by removing the four
the COM2 dongle is shorted. If not, please replace the part with a
new one.
screws holding the feet in place and check if the DigiSET cable
(see figure 16 for location) is fully inserted.
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Figure 16: DigiSET connector location
Legend:
1. DigiSET connector
5.1.3 Internal wiring connection verification
After removing the bottom plate, verify the connectivity between the
heating block external connector and the PCB.
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
85C) then the fan is not working well. The SSR is probably
also defective. Verify if the fan is running correctly, if not,
then replace the SSR and the fan.
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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)
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If the LED is not ON, if possible, use an oscilloscope and see if there is a
1
2 3 4
5
pulsing signal on the trigger input, coming from the CPU. The pulse width
should always be 1 second regardless of the frequency (please refer to
the figure 15 and figure 18 for pin location). Take a couple of second to
verify the integrity of the 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 (bipolar transistor) verification
o If there is a signal at the output of the monostable chip (U3),
then the problem can be the bipolar transistor Q3.
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31
o Measure with a multimeter the voltage between T2 test point
1
2
and GND Jumper (analog ground).
o If there is a pulse or a steady 5V then the Q3 switch is fine.
The problem is probably the solid-state relay.
o If there is always 0V and the LED is ON or toggles, then
replace Q3.
Solid State Relay 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.
NOTE: If you’re using a scope, it must be isolated from the wall
outlet.
Figure 19: SSR test pins location
Legend:
1. QD5
2. QD6
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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).
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6. A/D Converter
The analog to digital conversion is the feedback information coming from the
heater block temperature sensors or from a DigiPROBE. The CPU section
handles this information in order to control the temperature of the heating block.
6.1 Possible A/D problem
If the DigiPROBE is reading wrong temperature, make sure that the
DigiPROBE itself is 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 DigiPROBE.
Unscrew the bottom plate and make sure that the JP2 connector is
fully connected with the jumper (see figure 21 for location)
Figure 21: JP2 Connector location
Legend:
1. JP2 header
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6.1.2 A/D power and connections
1 2 3
4
With the help of a multimeter, make sure that the A/D (U9) is powered
(see figure 22 for pin 15 and 16 location). If it is not powered up, then
the 5V regulator (U7) part is not functioning correctly.
If available, with help of a scope, verify that the 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/D and verify if the system is heating up accordingly and
that the temperature feedback is correct.
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7. CPU Section
1
2
The CPU section is in fact the daughter card that fits directly on the KeyPad
controller PCB (see figure 23 for location).
Figure 23: CPU daughter card location
Legend:
1. CPU 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 CPU diagnostic.
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36
7.2 Power LED malfunction
If the power LED is not correctly functioning and the section 1 has been fully
verified:
Verify the battery and the socket integrity (see figure 23 for location):
Part must be replaced and the preprogrammed setup 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 temp set and time). The default values are: Jr, English, 25C
and 999min.
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8. DigiPREP Blocks
3
2
1
6
DigiPREP Jr. 24 position
Digestion Block
One (1) - 24 Position
DigiTUBE Racks
5
7
4
DigiSET dongle
DigiPROBE dongle
8
8.1 DigiPREP Jr. Block description
1. DigiPROBE Connector – Connection port for DigiPROBE. DigiPROBE will
allow direct monitoring and control based on actual sample temperature.
DigiPROBE Dongle must be installed to run the DigiPREP Jr. without the
DigiPROBE option.
2. Cable Connector – Connection port for the DigiPREP Jr. 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 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 Touch Screen* controller (*Sold separately)
6. DigiPROBE (Option) – To monitor and control sample or block temperature.
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3
2
1
DigiPREP MS 48
position Digestion Block
Two (2) - 24 Position
DigiTUBE Racks
5
6
4
DigiSET dongle
DigiPROBE dongle
7
7. DigiPROBE Storage Well – Use with replaceable glass liner.
8. Voltage Selector Switch - Select appropriate voltage. If 115 V is showing,
system is
running at 115 volts.
8.2 DigiPREP MS Block Description
1. DigiPROBE Connector – Connection port for DigiPROBE.
DigiPROBE will allow direct monitoring and control based on actual
sample temperature. DigiPROBE Dongle must be installed 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 reached. DigiSET dongle must be installed to run
DigiPREP MS without the DigiSET option.
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39
5. DigiPREP Controller – DigiPREP MS is designed to be used with
4 2
1
DigiPREP HP Digestion
Block
5 6 3
7
DigiSET dongle
DigiPROBE dongle
DigiPREP KeyPad* or Touch Screen* controller (*Sold separately).
6. DigiPROBE well – Use with replaceable glass liner.
7. Voltage Selector Switch - Select appropriate voltage. If 115 V is
showing, system is running at 115 volts.
8.3 DigiPREP HP Block Description
1. DigiPROBE Connector – Connection port for DigiPROBE.
DigiPROBE will allow direct monitoring and control based on actual
sample temperature. DigiPROBE Dongle 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 sample
volume is reached. DigiSET dongle must be installed to run
DigiPREP HP without the DigiSET option.
5. DigiPREP Controller – DigiPREP HP is designed to be used with
DigiPREP KeyPad* or Touch Screen* controller (*Sold separately).
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Rev.1.1
40
6. DigiPROBE well – Use with replaceable glass liner.
5
1
4
2
DigiPREP HT Digestion
Block
3
7. Voltage Selector Switch - Select appropriate voltage. If 115 V is
showing, system is running at 115 volts.
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.
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8.5 Heater verification
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
The following figure shows the heater general diagram.
Figure 24: Heater general diagram
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Rev.1.1
42
Figure 25: Heating Block internal connection
8.5.1 DigiPROBE error
If the dongle is put into its socket (COM2), the RTD (temperature sensor) is
faulty. Please open the block and make sure that the impedance of the RTD is
108 ohms.
There are two DigiPROBEs, an old and a new 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 functional
Make sure that the voltage selector switch is at the correct position for your
location.
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Figure 26: Heating Block Parts
Models
Voltage
Resistance
DigiPREPHP
230 V
115 V
30
60
DigiPREP Jr.
230 V
115 V
50
100
DigiPREP HT
230 V
20
5
2
1 4 3
Legend:
1. Thermal Switch 180 C
2. Voltage selector (115V-230V)
3. Heater pad
4. Graphite block
5. RTD (thermal sensor)
Figure 27: Heating pad resistance
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9. Part lists
SCP
number
Part Description
Manufacturer
Number
E296
Fuse, 0.5A, 250V, Fast blow, 1/4x1
1/4
AGC-1/2
E239
Voltage selector
83710030
E225
Switchcraft Panel Mt. 2 Pin Male
EN3P2M
E226
Switchcraft Cord, 2 Pin Female
EN3C2F
E287
Buzzer, Piezo
PKB24SPC-3601
E293
Diode, Rectifier, 1N400X
1N4002
E295
LED, Green
LN31GPHL
E305
Transistor,'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-SLWAC
E325
Voltage 'Regulator, 5Volt
UA7805KC
E326
Monostable multivibrator
MM74HC123AN
E329
CPU module
101-0383
E330
Solid State Relay, 240VAC, 25
amp
PF240D25
E331
Voltage regulator 5V 0.1A
LM78L05ACZ
E332
A/D Converter, 16 pin, dip
AD7705BN
E333
Crystal ,4.91520MHZ
MP042
E364
Battery,'3V, lithium battery
CR2354
E499
LED Blue
LNG901CFBW
E550
Power Cord Switch 15a
ABDWF150C0-831
9.1 Controller major part list
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Rev.1.1
45
9.2 Heating Block major part list
SCP
number
Part Description
Manufacturer
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
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10.Service Department
Please phone your local service representative and report this 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
KeyPad service manual
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11. INDEX
Figure 1 : Symptoms vs. document references ...................................... 8
Figure 2 : DigiPREP KeyPad controller physical diagram ..................... 10
Figure 3 : KeyPad layout ...................................................................... 11
Figure 4 : KeyPad displsy mounting view ............................................. 14
Figure 5 : General KeyPad block diagram ............................................ 16
Figure 6 : LED cable position ................................................................ 17
Figure 7 : Backlight and R4 location ..................................................... 18
Figure 8 : LCD display ribbon cable position ........................................ 19
Figure 9 : KeyPad electronic diagram ................................................... 20
Figure 10 : KeyPad resistors location ................................................... 22
Figure 11 : Push button measuring 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 21 : JP2 connector location ....................................................... 33
Figure 22 : A/D, oscillator and regulator location .................................. 34
Figure 23 : CPU daughter card location ................................................ 35
Figure 24 : Heater general diagram ...................................................... 41
Figure 25: Heating Block internal connection ……………………………42
Figure 26 : Heating Block Parts ............................................................ 43
Figure 27 : Heating pad resistance ....................................................... 43
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KeyPad service manual
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