The Electronic Compartment; Detailed Description - Honeywell 854 ATG Series Instruction Manual

5.4 The electronic compartment

5.4.1 Detailed description

The electronic part of the 854 ATG requires no special maintenance.
However, a detailed description of the combination of the several parts is given in order to help you in case of
software-updates or system enhancements.
Never remove the electronic boards when the mains power is connected to the gauge.
The control hardware is concentrated in the electronic compartment, which contains a minimum number of
sub-assemblies. The design of the 854 ATG is such that it makes replacement and service simple.
The electronic compartment contains the following sub-assemblies (refer to figure 5.4):
1 Back-plane
2 Printed circuit board XPU
(Xmission Processing Unit)
3 Printed circuit board SPU
(Servo Processing Unit)
4 Printed circuit board
(Optional board: HCU)
5 Printed circuit board GPS
(Gauge Power Supply)
6 Force transducer
7 Stepper motor frame including encoder disc
Instruction manual 854 ATG
Caution
It may damage the electronic circuits.
Figure 5.4 Cross section of the electronic
and terminal compartment
Maintenance
Page 41