Table of Contents
Advertisement
GENERAL ELECTRIC
MEDICAL SYSTEMS
1-981
À Indicates Change
AMX-H X-RAY UNIT
SM A0654E
1.
Turn circuit breaker and keyed switch to ON.
is obtained with the trace, readjust 3A2R34,
per step 5, then readjust 3A2R30 to obtain the
A trace. Repeat procedure until the center
trace is obtained when the x-ray tube current
is 100 MA with battery voltage above 110 VDC.
9.
Turn keyed switch and circuit breaker OFF.
2.
Check battery voltage. It should be greater than
110 VDC with the control ON.
3.
Select 50 KVP and 10 MAS. Make an exposure
and observe that the x-ray tube MA meter "kicks"
up scale.
10.
Disconnect only the following instrumentation.
NOTE:
Tone "beep" and x-ray on light
a.
Scope connections across 3A2C55
during exposure.
b.
Filament transformer primary voltage at
3TB1-12 and 3TB1-18.
4.
Select 80 KVP, 200 MAS.
c.
Replace 3A2 Board in card rack.
5. & Take an exposure and read the MA meter
11.
Check off F3316 Functional Checks No. 12 and
If it is not 100, adjust 3A2R34 to obtain
No. 14.
an x-ray tube current of 100 MA +/- 1.0 MA
(CW to increase MA).
NOTE:
Do not make more than one ex-
ri
SHORTING
SWITCH
το
posure per minute to stay within
6CBI-8
2TBI-3
tube ratings.
ILLUSTRATION 4-11-32A
7.
For the next check and adjustment, battery
must be at full charge.
With power off, locate leads at main power
circuit breaker 6CB1-B (heavy lead). Remove
leads from 6CB1-B and connect a 10 ohm,
100 Watt adjustabie resistor and shorting
switch as shown in Illustration 4-11-32A
between the leads and 6CB1-B. Turn power
on but DO NOT MAKE
EXPOSURES. Press
rotor button only. Depress switch on device
shown in Illustration 4-11-32A and read voltage
on DVM and adjust resistor tap to obtain
90 VDC + 5V. With rotor depressed, adjust
3A2R30 to obtain the filament voltage
1
recorded earlier. Recheck this voltage with
the 10 ohm resistor shorted (switch released).
If difference in voltage is more than + 1 volt,
adjust 3A2R27. Repeat checks and adjustments
until change in voltage is less than + 1V with
21812-P10
ILLUSTRATION 4-11-32
B Trace:
Filament voltage too high and MA
regulator pulling down or filament voltage normal
resistor in or out. Remove switch and resistor
and replace leads on 6CB1-8.
Observe MA stabilizer signal on scope to verify
that filament voltage and adjustments in MA
regulator are optimum. Use 80 KVP, 16 MAS.
Settings of 3A2R30 and 3A2R34 are correct
if the A scope trace is obtained when the x-ray
tube MA meter reads 100 MA during an ex-
posure of step 5. If more or less than 100 MA
4-11-28
but regulator pulling down improperly:
Adjust
3A2R30 CCW.
A Trace:
Filament voltage correct and MA
regulator adjusted correctly.
C Trace:
Filament voltage too low and MA
regulator pulling up or filament voltage normal
but regulator pulling up improperly. Adjust
3A2R30 CW.
Advertisement
Table of Contents
