c. Be sure that the platen arm moves freely from the up position to the
lower clamping position and that the latch is held in place by the keeper
d. Be sure that the power cable connector is plugged into the power
source. Move the power switch to the ON position. The ruby safe light
See that no unexposed photographic paper is present when
the printing lamps are lighted. The lights from the
printing lamps will fog the photographic paper.
e. With the access door open (figure 22), pull the platen arm down to
the closed position, allowing the latch on the platen arm to engage the
keeper strip. If all the lamps light, release the latch and allow the
platen arm to return to the vertical position. Close the access door.
f. Be sure that the ground side of the diffusion glass faces the
The following statement describes the function of which part of the
"This switch is actuated by the contact spring on the platen arm.
When the platen arm is lowered, the switch is closed and the four
white printing lamps will light."
Power switch (ONOFF).
None of the above.
Describe the function of the masking blades.