Teledyne 402REU - Hydrocarbon analyzer - Manual (Page 45)

Total Hydrocarbon Analyzer Maintenance and Troubleshooting
5-11 Teledyne Analytical Instruments
boards and interconnected via a motherboard, which contains the connec-
tors into which the circuit boards are inserted.
The layout of the motherboard changes very little, in spite of the fact
that it is used in a wide variety of instruments. This allows a universal
approach to its use, and the circuit boards which are used can thus remain
the same in varied applications.
The circuit board connectors on the Mother Board are labeled J1
through J6 and are used in totally standard instruments to connect and hold
plug-in printed circuit boards in the following configuration:
J1: Flame guard-anode power supply
J2: Not used for the standard Model 402R
J3: E-to-I converter (isolated)
J4: Alarm comparator (dual)
J5: Differential power supply
J6: Temperature control
In addition, connector J1 is used with the Model 402R-EU; J1 plugs
onto the electrometer amplifier PC board. These are shown in Figures 5-2
and 5-3.
The alarm comparator is an optional circuit; it has two (dual) adjust-
able setpoints at which an alarm or indicator is activated. Alarm circuits
normally employ relays to provide contacts which may be connected, via
terminal strip, to auxiliary signal devices.
Consult the following pages for detailed descriptions of the plug-in
circuits used with the Model 402R.
5.5.1 Flame Guard and Anode Power Supply Printed
Circuit Board
Schematic No. B-67810
Assembly Dwg. No. B-67797
Anode Power Supply: The high voltage anode power supply com-
ponents (except for transformer) are mounted on the flame guard and
anode power supply printed circuit board. High voltage regulation is