BTH 450/30 User manual

Film-Tech
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L No .sound- (after allowing
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audlble rn speaker.
POSSIBLE CAISE
Mains supplv off.
Arnplilier {use blown.
Broken connection.
Amplifier fault (defective valve)
Exciter lamp fault1, or out of
aOJustment.
Exciter lamp sri-itch,lefective.
Phorocell
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plug not
properlr-firred
into ampiifiei;
or
rault)' connections
be1
rveen
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Check
mains supply.
Inspecr
malns-lr1nl
r.ectiher
ari
check
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ll"pg"! fuse and replace as ncccssar\..
Check ieads and pligs, L
neck
teads
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"t::.i..:io_,"^_":1-" .thul the. sup-p11.
is reaching the
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RE}IEDY
(a)
(b)
(.)
(c/
(d)
4. Sound volume low,
(d) Photocell faulty.
(a) Exciter lamp out o{ a<ljustment
or Dtackenedwith age.
(b) Faulty valves.
Faulty photocell.
Dirty-so-undhead mirror.
amplifier to lour l\ge,rt ro. attentlon.
Check and re-adjust.
Check swrtch, 25, Fie. i.
Remor-e photocell h6lcler and plug from base of
projector and make sure that c"tt ii prop".tf nit"a.
Inspect screened-1ead conrre.tiorr'fr"i*"J"" ""il_
l:]9* *.".a
piug. Refit celthoide;-a;J
i".r, +_"i,"
ptug well home.
Try replacement.
Re-adjust or replace.
Try replacing -valves, remembering that more than
:fl:.*ly be faulty. First observelt a"y "af"e is not
rry replacement,
Lrean
mlrror (see
page 15). o
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