LOOSE FREQUENCY DIAL.

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

adequate clearance.

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.