Bell and Howell 1598, User Manual

Page: 21 / 38

P a n chromatic TQIII & TQIII Specialist User Manual
Page
21

Problem
Projector does not run, threading light and red window on exciter lamp cover not lit.
Causes
No mains supply, or main power switch still at "off".
Remedy
Check and correct.
Cause
Failure of main fuse.
Remedy
Replace fuse with one of the Correct rating as described in Stage 59, noting that it must be
of the " thermal" or surge-resisting type. If the replacement fuse fails, do not fit another
but ask your audio-visual dealer to examine the projector.

Problem
Sound but no picture.
Cause
Failure of projector lamp.
Remedy
Replace lamp (Stages 51-55).

Problem
Picture but no sound.
Cause
Failure of exciter lamp (red window on exciter lamp cover not illuminated).
Remedy
Replace exciter lamp (Stages 56-58). If new lamp does not operate, there is an electrical
fault needing the attention of your audio-visual dealer.
Cause
Break in speaker cord or fault in external loudspeaker.
Remedy
Remove plug of speaker cord from back of projector. If sound now comes from projector's
internal speaker, there is a fault in the plug, cable or (very unlikely) the external speaker.
Examine the cable for obvious signs Of damage and makes temporary repair. If there are
no such signs, seek the help of an audio-visual dealer.
Cause
Overloading of amplifier or short circuit in loudspeaker connections has caused protective
cut-out to operate.
Remedy
Press and release arrowed cut-out button. If sound fails again almost immediately, and an
external loudspeaker is being used, switch off and examine the speaker cable for a possible
short circuit before pressing the button again. If sound fails only during very loud passages
continue projecting at a lower volume level. If the cut-out operates repeatedly when you
are using the internal speaker, there is a fault calling for workshop attention.