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GENERAL
ELECTRIC
MEDICAL
SYSTEMS
AMX-li X-RAY UNIT
10-377
3-3
MA and Filament Protection
initial conditions:
Main power circuit breaker-OFF
X-ray generator standby switch—OFF
Charger cord disconnected
SM A0654E
OPERATION
RESULTS EXPECTED
SERVICE REFERENCE
la.
Remove the jumper
(with banana plugs) from
terminals MA+ & MA- on
panel 3.
install an accurate 0 to 150
ma, DE millameter with
plus lead in the MA+ end
and the minus lead in the
MA-.
b.
Connect a O to 150 v,
iron vane type, AC voltmeter
across 3TB1-18 and 3TB1-12
to read XS-XC
Filament
Primary Voltage.
c.
Turn the x-ray tube
port up, close collimator
blades and cover collimator
port with a 1/8" (3.175 mm)
thick lead sheet.
d.
Turn circuit breaker
and standby switch ON.
Select 80 KVP, 200 MAS,
(2-second exposure).
소소 e.
Take an exposure and
read the ma meter.
Do not
make more than one expo-
sure per min.
속어.
Make another exposure
and read the voltage across
3TB1-18 and 3TB1-12.
At
the end of the exposure.
g.
Press the Rotor button
only and read voltage across
3781-18 and 3TB1-12.
MA should be between 95 and 105 MA.
AC Filament Primary Voltage on
3781-18 and 37B1-12 should not
change more than 1.0-v.
RMS between steps f and g.
If MA is not 100, adjust
3A2R34 to obtain 100
MA X-ray tube current.
Refer to Chapter 4, Sec.
1-3 or Chapter 4, Part Il,
Sec. Il.
Adjust 3A2R30 to obtain
the same reading as in
step f. Refer to Chapter
4, Sec. 1-3 or 4-11-28.
5-9
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