Picker Vector 80 Xray generator

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138 See Interlock Troubleshooting

Interlock Troubleshooting
Almost all interlock problems with Picker equipment deals with operator setup. The Vector Generator will indicate an
interlock problem (in general) by displaying “TABLE SAFETY” or “CTM SAFETY”. The following list is a good place
to start.
1. If the Collimator “EXP” light is flashing on the Collimatic 4 this will prevent any exposure and the following must
be examined to find the problem. This will also be indicated at the Console as “CTM SAFETY”.
a. Make sure the tube is not over 48 inches above the Table Bucky when making exposures to the table.
b. Make sure the Filter on the right side of the Collimator is pushed in all the way. Confirm switch is good.
To determine if it’s the Filter Switch, decrease the kV selection below 50kV and the fault condition will
change.
c. If making an exposure to the table be certain there isn’t a Cassette in the Wall Unit and the arm is UP on
the Pausch KS80.
d. If making an exposure to the Wall Unit be certain there isn’t a Cassette in the Table. If the Cassette Tray
has to be pulled out and there is NOT a Cassette in the Tray then the Sense Switch in the Tray needs to be
adjusted.
e. Be sure the Tube Hanger is on the SID switch when making an exposure to the Wall Unit.
2. Fluoro interlocks usually deal with the Fluoro Peripherals. These will be indicated at the Console as “TABLE
SAFETY”.
a. Spot Film Device must be pulled forward and locked in place. Park Switch can cause problems too.
b. 100mm Spot Camera must be loaded with film.
c. A Cassette must be loaded and ready in the Spot Film Device OR the Carriage must be in the back
parked position.
3. Always check for Room Door Switches when in doubt.
Follow the sequence below to locate an interlock problem if all the above checks out. Control should indicate “READY”.
1. Press the PREP Button. Do you get “ROTOR READY”?
NO—Indicated by Error 710. See Rotor Drive Troubleshooting.
YES—Press the EXPOSE button with a Bucky Technique selected. Did you make an exposure?
YES--[END]
NO—Did you get an Error 138?
YES—Verify the Grid is moving off of the exposure release switch in the Bucky. Did the Grid
move when the EXPOSE button was pressed?
YES—Check the Exposure Release Switch and a possible broken wire on the
articulating arm to the Table Bucky (common problem). [END]
NO—Is Relay K323 pulling in?
NO—Measure the Wire Wrap Pin 33 on I/O PCB 6. Is it LOW?
YES—Check K12A contacts. [END]
NO—Measure the Wire Wrap Pin 4 on I/O PCB 5. Is it LOW?
YES—Measure TP17 on the Exposure Control PCB. Is it HIGH?
YES—Using the TABLE below, verify all conditions are met
for exposure. [END]
NO—a23 on the Exposure Control PCB (PCB 10) is wired
the same as I/O PCB 5-4 and should be LOW. If it’s
LOW then repair or replace the Exposure Control
PCB. [END]
NO—Attempt an exposure using the EXPOSURE TEST BUTTON
in the Power Module (PREP button must be held in first).
Was an exposure possible?
YES—Possible problem with the Console EXPOSE button
or wiring from the Console to the Electronics
Cabinet. [END]
NO—This is not a likely case if all the above checked out.
[END].
YES—Measure at the Grid Motor for 110Vac when the EXPOSE button is
pressed. Is the Voltage there?
YES—Replace the Motor. [END]
NO—There is possibly a broken wire on the articulating arm to the
Table Bucky (common problem). If this is the Wall Bucky
then check for a broken wire in the cabling. [END]
NO—Is there an Error displayed on the Console?
YES—See Description of Errors and Error Code Troubleshooting.
NO-- Using the TABLE below, verify all conditions are met for exposure. [END]