Telephone: TEMple Bar HH
Telegraphic Address: "Spotlite, London-WO"
From THE STRAND ELECTRIC & ENGINEERING CO., LTD.
25 FLORAL STREET, COVENT GARDEN, LONDON, W.C.2
Per Carr.
System LC Ml\,. II
TROUBLE SH001ING
Determine the extent of any trouble as the numbers
1
of
th e chan nels involv ed provide a valuable clue
I
t ~ the source of th e fault. An AC/DC multi-range
meter can be used to good effect to trace a fault.
The testpoint for the positive connection is given
first where voltages ar e mentioned below.
Loss of control on all channels on upper half of cabin et
a.nd on
all X and Y mast er dimmers; no orange pilot l amp indication on
l eft hand side of cabinet master panel, or on No. 1 rack power
.!;illll •
Check circuit breaker feeding No. 1 rack power unit.
Check 8-pin plug and socket
on. this power unit.
Loss of control on all channels on upp er half of cabin et only
Check
F.13 7 amp fuse, also F.1 and F.2 and F.2 GS 150/50 fuses
(25/27 volt D.C. between testpoints T.6 and T.4) on No. 1 rack
power
t ermin als
t ermin al
unit. Check for loos e or brok en connections between
j - j (25/27 volt D.C. betw een t estpoint T.6 and
j • )
Loss of con t rol on all X and Y mast er di mmers; no or ange pilot
l amp in dica t ion on l eft hand sid e of cabin et mast er pan el or on
No, 1 rack power unit .
Check F.5 7 amp fuse (25 volt A.C testpoints T.6 and T.5) . Check
connections between terminals a - a , also b - b (25 volt A.C.
between t er minal b and a, 24 volt at cabin et).
Loss of control on all channels on lower half of
both Z master di mmers; no orange
pilot l amp i ndi cation on right-
c,1bin et and on
hand side of cabinet master pan el or on No.2 rack power unit (No.3
rack wher e th ere are
moI·e th an two r acks.
Check circuit bre aker fe eding No.2 rack (or No.3 rack power unit.
Check 8-pin
P+ug and socket on this power unit.
Loss of control on all channe ls on lower half of cabin et only
Check F.13 7 amp fuse, also F.1 and F.2 GS 150/50 fus es (25/27
volt D.C, betw een testpoints T.6 and T.4 on
No.2 r ack (or No.3
r ack) power unit. Check for loose or bro ken conn ections betw een
1
tt-r_:riin~l.s j-j (25/27 volt D.C. between t est point T .6 and t ermin al
j) •
Loss of con t rol on both Y master dimmers; no orange pilot lamp
indi cati on on right-h and side of cabin et master pan el or on No.2
rack
p~wer unit (No.3 rack where th er e ar e more th an two r acks.
Check F. 5 7 amp fuse (25 volt A.C. between testpoints T.6 and
T.5). Check connactions between t erminals a-a, also b-b (25 volt
A.C. betwe en terminals band a, 24 volt at cabinet).
C
C
Loss of control on channel Nos.
t wo r acks, or on Channe l Nos. 73-96.
Is the or ange pilot lamp alight on th e power unit corresponding
to thes e numbers? If not check circuit breaker feeding the
power unit. If pilot alight check
F.2 GS 150/50 fuses (25/27 volt D.C. between t estpoint T.6 and
7.4) on this power unit. Also 8-pi~ plug and socket. See also
below.
Loss of control on channels 1-24, 25-48, 49-72 or
compl ete di mmer rack).
Ci:l~k on corresponding rack power unit F. 13 7 amp fuse ( 25/27 volt
D.C. betwe en testpoints T.6 and T.4). Check int ernal connection
to t erminal 1 or k on some models (25/27 volt D.C. between testpoint T.6 and t ermin al 1 or k).
Partial
of th e 24 channels will fad e to blackout.
Check on corr esponding rack power unit F.6
lo ss of control on one compl et e dimmer r ack in th at none
25-48 when th er e are more th an
F.1? 7 amp fus e , also F.1 and
73-96 (i. e. one
2.5 amp fuse (14/16
volt D.C. between testpoints T.6 and T.3). Check also
F.4 amp fuses and intern al 6-pin plug and sock et to stabiliser
sub-assembly (7/8 volt D.C. between testpoints T.6 and T.2).
Loss of control on one mast er dimmer only
Check corresponding 2 amp fus e on cabin et. If intermittant loss
of control when fadin g check for cl ean cont act on wiping track
of mast er dimmer or work brush. If necessary cl ean track with
non-corro sive metal polish and subsequently with carbon
tetrachloride.
2
F.3 and
Loss of control on ten adjacent-numbered channels
C
Check appropriate 30-pin
unit.
Loss
four of a rack
Check F.7
fuse protects five adjacent-numbered channels therefore F.12
is normally spare.
Complete loss of control on one channel only
Check for faulty projection lamp or faulty flexible cables to
th e lighting unit. Check load line for short circuit. Check
channel circuit breaker on dimmer rack, and connections to
termi nals 1 - 1, also bridging loop,on reactor di mmer. Check
that channel control amplifer
fault still persists then localise fault to switching or dimming
facilities. Check that
volt D.C. betw een channel 'switch' control terminal and test-
df control on five adj~cent-numbered chann els or the last
- F.11 7 amp fu se on corresponding power unit. Each
~lug and socket on corres ponding power
is secure in edge conn ector. If
the channel contactor is closed (24/27
C
C
point T.4). If not check chann el 'switch' (yellow) connections
at cabinet and at uppe r thr ee - position switch. Check channel
'dimmer' (blue/orange) control terminals (12 volt D.C. between
testpoint T.6 an d 'dimmer' t erminal when dimmer instructed fullon, or
81 diode in both the white and green dimmer lever units.
Substitute
this does not clear fault ch eck all connections to edge connector,
th e appropriate
D.C. connections to the saturable reactor dimmer.
One channe l only reaches maximum light below position
th e white and th e green lever scales
Check chann el f ee dback fuse (1 amp)
One cha nne l_only
when moving the whit e or th 8 gr een dimmer lever
Check continuity of 10k oh.'TI r ,_jsistance strip on dL: r:~r l evor unit.
i 1 volt D.C. when dimmer instructed to zero. Check OA
anoth er con tr ol a~plifier in the faulty channel, if
30 pin plug and socket on the power unit and the
5 on both
loos os or gai11s control at c:tn i Lt" rucdi Gte position
3
One channel will not fade out as other of the same load do on the
same dimmer size and tapping number.
C
With both dimmer levers at zero check for a constant 24 volt D.C.
(minim}lll) between testpoint T.6 on the power unit and the
t estpoint of the channel control amplifier. If not correct
turn the slot of the 'bottom' preset potentiomete on the amplifier
anti-clockwise until the voltage is steady or reaches the
maximum and then turn past this point by a few degrees.
One channel will not rise to full as others of the same load
do on the same dimmer, size and tapping number
With the dimmer switched on and both dimmer levers and associated
masters set to full, check the voltage between testpoint T.6 on
the power
Turn the slot of the
clockwise until the reading on the meter drops to its lowest value
(approx.
to begin with, then change down to a lower scale.) When voltage
reached the minimum turn
I
'·
u1,it and the testpoint of the channel control amplifier.
'to p ' preset potentiomet er on the amplifier
i volt D.C. but use a scale capable of 30 volt deflection
J.:ia.st this point by a few degrees.
l
(
Note: If the supply voltage differs from the voltage stated at
the time of order then the tappings on the primary winding of all
power transformers will have to be changed accordingly and
probably the 'top' potentiometer of each amplifier adjusted as
described above . This should be done with the maximum load
connected to each dimmer.
4
Power Pack Unit
F.1, F.2
F,3, F.4
F .6
I
F,7 -; F.13 also F.5
Feedback
All
Control Cabinet
All
FUSE RATINGS
GS 150/50 H.R.C. fuse link
4 amp
i" x 3/16
2.5 ampi"x3/16" fuse link
i ll
X
-'--'"
X
1,il-11x
3/16
3/16
,il-n
7
1
2
amp
amp
amp
8
INDICATOR LAMPS
28-volt tubular 0.04
11
fuse link
11
fuse link
11
fuse
fuse
amp L. E.S. cap
link (Size 00)
link
(Size
(Size
(Size
(Size
00)
00)
00)
o)
(
C
(
The quick-fade switches can accept 28-volt tubular 0.04 amp
lamps with a cartridge cap but as these are non-standard the
switches are provided with cartridge to L. E.S. adaptors. Do
not disc ard these a daptors when discarding a lamp.
SPARES
Each principal sub-assembly has a re f erence number which should
be quoted, includin g any suffix letter, if orderi ng spares.
Numbers
SCHEMATIC
and lett er in circles refer to photogr aphs on pages 4
WIRING DIAGRAM
and 6 of the operation instructions.
The upper pa.rt of the diagram shows part of No.1 Dimmer Rack with
a power tr ansform er and power unit shown on th e l eft-hand side.
The stabiliser sub-a ss embly is shown to the right of test point
T3
• .l?art of th e control cabin et is shown on th e lower part of
the di agr am with mast er controls on th e l ef t-hand sid e. The
cabin et
power supplies are derived f rom the power units of two
r acks and ther efore only one set of th e cabinet mast er t erminals
are sho wn connected.
Wher e there are mor e than two dimmer racks
the cabinet power supplies are obtain ed from No.1 and No.3 racks
and te rminal e on rack 2 is connected to t erminal e on rack 1
and , where applicable, rack
The right-hand side of the diagram shows three
4 termi na l e to rack 3 terminal e.
complete dimmer
channe ls. Switch (1) has shorting type contacts and switch (4)
has non-shorting contacts.
:::::::l
EARTH/GROUND
NEUTRAi.
PHASE
---
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..,__ _ _.,_,.._...+_,._..,__~~--.....,_-'+-~..+--w_1=---_-_-_-<11_>-_-_-_-_--<_._ _________ ._ _____ ._ _____ J I _:
'-+-+-+-1-+-+--+-+---* Lower half of cabinet
rTT7
'-+-+ -+-I- -- *
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-----------=--=------=--=--=--=---::;1
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a-1 blue
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• • • •
SYSTEM LC
MK.II
©1963 STRAND ELECTRIC
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