1 There is no cassette present (operator error).
2 The over-table collimator is malfunctioning. See the over-table
collimator section in this lesson.
3 The back-up contactor is not closed.
(a) If the SAFETY/RESET lamp is lit, check the technique factors
(b) Check for a loose footswitch connection.
There could be a fault in the spot-film device.
(d) The malfunction could be caused by a fault in the exposure-delay
(a) Check for a loose footswitch connection.
(b) There could be a fault in the spot-film device.
The fluoro timer was not set (operator error).
(d) The trouble could be a fault in the fluoro timer (open).
d. Radiation. When the EXPOSURE sequence appears OK, but there is little or
no radiation, the following conditions may exist.
The circuit breaker could be open in the filament circuit.
There may be a fault in the cooling chimney or filament-control PCB.
There may be a poor high-voltage jack-pin connection.
Check for a loose connection in the primary power wiring.
Look for dirty contacts on the ma-select relay(s).
There could be a fault in the timer PCB.