Page 5 - SAFAR

mechanism to be readily inspected. Electrical connections between the projector
unit and the amplifier are so arranged as to be impossible to replace wrongly. Similar-
ly, the ~ mplifier is readily withdrawn from the cabinet after the removal of four
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screws.
The projection lamp is cooled in use by a rotary blower driven by the m::>tor.
Electrical switching is so arranged for it to be impossible for the lamp to be operated
without this blower running, and the lamphouse is maintained at a reasonably low
temperature even on pr.)tracted periods of use. In addition, all electrical components
are rated at a generOUS safety factor, S'J that the whole projector runs at a remarkably
low ambient temperature.

The attractive die-cast case in which the projector is housed is sufficiently robust
for an additional carrier case to be unnecessary. The loudspeaker, together with the
cable with which it is connected to the amplifier, and the mains supply cable, is housed
in a second case of similar construction and dimensions. Both cases are fitted with
substantial carrier-handles, and when the cases are closed for transit there are no
projections other tha n the rubber mounting feet on the bottom of each case. These
rubber feet allow the cases to be stood on a polished surface with complete safety and
without danger of slipping. Additional equipment, such as the spool, films, etc.
require separate casing, but usually the em pty spool can be accommodated in the film
programme case supplied by film hirers.

Supplementary equipment available for the PEM projector includes a compact
bench-type film rewinder, which may be attached to any table o r shelf and which
ensures ra pid , safe and accurate rewinding in a few seconds. With the exception of a
scree n of suitable size, no extra equipment is required with the projector.

INITIAL CHECKING
Uncrate the projector and examine for su perficial damage such as scratches and
breakages,_ etc. Unwrap and insert in their appropriate sockets the three valves,
(note that the cap secured t o t he cabinet by a short length of braiding goes on t he top
of t he EF6 valve, the EL6 in the cent re socket, and the AZI in the right-hand socket,
next to the lamp ho use) t he exciter and projection lam ps, and the two small indicator
bulbs. To open the projectio n lampho use, depress the small catch o n t he left side of
the door and pull it o utwards. Insert t he bulb, noti ng that it will oniy go into <:he
hold er one way; when the bulb is pus hed down as far as it will go, lock it by turning
half-a-turn clockwise. To insert the excite r lamp, remove the locking collar and
exciter lamphouse cover. Move the lamp shield thus exposed downwards out of the
way and insert the bulb. Lift the lamps hie ld into position so that the cap on the inside
supports the end of the bulb. Replace the cover and the locking collar. To insert
the two indicator bulbs, remove the two lampholders from the ir respective clips first.
Note that the two bulbs are of different rating. The green bulb, with a rating of 6.3v.
0.15 amp. is used as the amplifier warning I ight, and I ights up when the amp I ifier is
ready for use, i.e., when the valves have warmed up. It also acts as a fuse for the
rectifier valve. It is important to remember this function when replacing a burnt-out

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