Standard Frequency Series Generators
Maintenance
10
M-2008-7-15
7.4 TROUBLESHOOTING THE EXPOSURE START CIRCUIT (WITHOUT BUCKYS)
SYMPTOM
MOST COMMON PROBLEM
HOW AND WHERE TO TEST
Ready lamp lights but
NO
EXPOSURE.
Backup Contactor
will not close.
SCR’s are shorted. See if
ERROR CODE is Displayed.
With the Control energized, test voltage from
# J1-8
to
# J1-
10
on the bottom left end of the Mother Board. No voltage
should be present. If there is voltage present and you can
vary it by adjusting the
Major
and
Minor Selectors
, the
SCR’s are shorted and must be replaced.
Defective Timer Selector or
loose Ribbon Cables from
Timer to selector.
Ensure all ribbon cable is docked properly at the Timer and
the Selectors. Repair or replace.
SYSTEM WITHOUT
BUCKYS:
1.
Bucky Selected
when system is not equipped
with Bucky.
2. Bucky Select Switch or
its wiring or connections
are defective.
3. Exposure Switch
defective.
4. Power not getting to X-
ray Timer.
5. Condition A.
Contactor
Coil, its wiring or
connectors are defective.
Condition B.
Both
Contactor Coil and
Expose Lamp are
defective.
Condition C.
Timer is
defective.
Test 1-5 Set Timer to three seconds
1. Switch Bucky OFF.
If an exposure is now possible,
place a permanent jumper from B1 to B2.
2. If an exposure cannot be made place a jumper
between Terminal #7 to B1. Now, if an exposure is
possible, the Bucky Switch or its wiring connections
are defective and must be repaired or replaced.
3. Place a jumper between Terminals #6 and #7. If an
exposure is now possible, Replace the EXPOSURE
SWITCH.
TIMER SECTION
4. During Timer Standby continuous 120 VAC is required
on Timer Pins J1-2 and J1-4. Place volt meter between
those pins and confirm voltage.
For Exposures, The X-ray Timer requires 120 VAC
on B1 and the Timer pin J1-9. Place voltage meter
probes to A1 and B1. Depress Exposure Pushbutton.
After a 2.2 second time delay 120 VAC should appear.
If it does, place voltage meter probes to A1 and Pin
J1-9. Take another exposure. If the voltage appears
continue with the next test.
5. After Tests 1-4, with measurements confirmed, the
Timer, Backup Contactor, their wiring, or connections
must be examined.
Condition A.
Observe the Exposure Lamp. It is
wired parallel to the contactor coil and is energized
by the same voltage. Either can work independently.
Does the Exposure lamp light and extinguish
during Exposures? YES
– Then the Contactor Coil,
its wiring or connectors could be open. Place a volt
meter across the contactor coil and take an exposure.
If, during exposures, voltage is present the contactor
coil is open. If voltage is not present check its wiring
from A1 and J2-2. Repair or replace.
Condition B.
Observe Exposure Lamp.
Does the
Exposure lamp light and extinguish during
Exposures?
NO
– Place a voltmeter between Timer
pin J2-2 and A1. Take an exposure – Does the meter
indicate 120 VAC during exposures. If it does the
Timer is ok
but the contactor coil and exposure lamp
are both defective. Repair or replace.
Condition C.
After the above tests have been
completed and verified, place voltmeter probes
between J2-2 and A1. Take an Exposure. Does the
meter indicate 120 VAC during exposures? NO –
Timer is defective.
Replace.
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