SIGMA 150Ci - Manual (Page 39)

4.9
MAINTENANCE INSTRUCTIONS
Install new compression springs and assemble the outlet port mechanism. Apply Vibratite™
thread sealant to the socket head cap screws before tightening. Install a new set screw to
the outlet port cover.
After assembly of the front plate, perform the following safety function tests using a
bayonet source guide tube fitting. Pull the outlet port cover and rotate clockwise 90
degrees. Movement should be smooth and limited to a clockwise 90 degree turn. Insert a
bayonet fitting into the outlet port and rotate 90 degrees in a counter-clockwise direction.
Insertion and rotation of the bayonet fitting should be smooth and without snags. Rotate
the outlet port cover from a 3 o'clock position to a 5 o'clock position. This operation moves
the rotor from the port shield position to a pass through section of the rotor. Reverse the
operation to disengage the bayonet fitting. Repeat the function test three times to ensure
smooth operation.
8 Re-assemble the Model 880 exposure device by performing the following steps:
Apply Permantex™ anti-seize thread lubricant to the first several end threads of the back
plate’s (locking mechanism) four 5 /
16
-18 x 1 1 /
2
in socket button-head screws. Align and attach
the locking mechanism assembly to the exposure device's end plate by installing the four
5 /
16
-18 x 1 1 /
2
in screws using a tamperproof tool bit mounted in a calibrated torque wrench.
Torque the tamperproof screws in an opposing cross-pattern to 110in/lb (12.43Nm),
+ or - 5in/lb (0.57Nm).
Apply anti-seize thread lubricant to the first several end threads of the front plate's
(outlet port) four 5 /
16
-18 x 1 1 /
2
in socket button-head screws. Align and attach the
outlet port assembly to the exposure device's end plate by installing the four
5 /
16
-18 x 1 1 /
2
in screws using the tamperproof tool bit mounted in a calibrated torque
wrench. Torque the tamperproof screws in an opposing cross-pattern to
110in/lb (12.43Nm) + or - 5in/lb (0.57Nm).
Operationally test the function of the entire system using a bayonet-fitting source guide
tube, the remote controls and a mock source assembly.
Attachment of the bayonet source guide tube to the outlet port must be smooth and
without resistance. Rotate the outlet port mechanism to enable exposure of the mock
source assembly.
Connect the (serviced) remote controls to mock source assembly connector and the device
locking mechanism. Push the lock slide into the EXPOSE position and crank the control cable
into the exposure mode. While cranking the mock source assembly from the exposure
device, carefully feel for resistance or snags. During retraction of the mock source assembly
back into the exposure device, carefully feel for any resistance or snags during movement.
Conclude the test by verifying the lock slide automatically secures the mock source assembly.
Action of the lock slide should be smooth with an audible ‘snap’ during automatic securing.
After automatic securing, attempt to expose the mock source assembly from the exposure
device to confirm a positive capture. Repeat this testing several times. If resistance, snags or
sluggish movement of the lock slide is discovered during this testing, remove the outlet port
and locking mechanism plates to determine the cause. Repeat all safety function tests if any
additional servicing is required.
Clean the Model 550 jumper gauge in solvent. Lubricate the inner sleeve with light oil while
moving the sleeve back and forth. Apply a light coat of oil over the entire jumper and insert
back into the spring clip of the locking mechanism's protective cover.