SCP SCIENCE DigiPREP HP Service Manual

KeyPad service manual
Rev.1.1
33
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
1

SCP SCIENCE DigiPREP HP Specifications

General

Brand	SCP SCIENCE
Model	DigiPREP HP
Category	Keypad
Language	English