4.4.3 LOOSE FREQUENCY DIAL.
If the frequency (RPM) dial turns when the range -switch position
is changed, the range -switch knob and mask are rubbing against the
frequency dial. Remove the scale-mask assemblv and reposition the
frequency dial. Refer to paragraphs 4.7.3 and 4.7.4 for detailed instruc -
tions. When mounting the scale-mask assembly, be sure to maintain
sufficient clearance between the mask and the dial. It is not necessary
for the mask to project above the rim of the frequency dial to obtain
4.4.4 CASE WILL NOT LOCK PROPERLY.
If the screws that fasten the side plates of the handle assembly
to the cover become loose, proper operation of the slide pins may
become difficult or impossible. Close the instrument and set the slide
pins in the lock position by moving the side plates up or down. Tighten
the screws on the side plate. Check operation in the open position.
If necessary, loosen the side plate screws and reposition these plates
slightly so the case will lock in both open and closed positions.
4.4.5 REPLACEMENT OF STROBOTRON LAMP.
To replace the strobotron lamp, remove the reflector from the
swivel assembly by pulling it away from the panel of the instrument.