SCP SCIENCE DigiPREP HP, Руководство по обслуживанию, Страница: 21 / 49

KeyPad service manual
Rev.1.1 21
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 Digi PREP 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)