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Table 2-2. Failure Analysis Chart
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TM-5-6675-250-34 Survey Instrument Azimuth Gyro Lightweight( Leaser Siegler Inc. Models AG-8 and AG-8A) Manual
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Figure 3-1. Electronic Control Panel.
TM 5-6675-250-34
CHAPTER 3
REPAIR
OF
ELECTRONIC
CONTROL
UNIT
a. Removal.
3-1. General
(1) Press the pressure relief valve on the case to
The ECU consists of a control panel assembly with
relieve  internal  pressure.
related electronic parts, installed in a portable case.
(2) Unlatch and separate the lid from the bottom
When connected to the GRU and electric power
section.
s o u r c e , the ECU provides controls and instruments
(3) Loosen the eight captive screws and lift the
f o r operating and testing the GRU.
electronic control panel assembly from the case (fig.
R e p a i r of the ECU consists of replacing defective
3-1).
components. Refer to troubleshooting procedures
b . Installation.
(table 2-1) and failure analysis (para 2-16) to isolate
(1) Position
the
electronic
control
panel
defective
components.
assembly in the case and tighten eight captive
3-2. Electronic Control Panel Assembly
screws.
Repair of the electronic control panel assembly
(2) Secure the lid onto the bottom section of the
consists  of  replacing  defective  components
case.
authorized by the MAC. Procedures for removal and
installation of components are described in following
paragraphs.
3-1

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