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APPENDIX H:
Normal Positions of Jumpers on Cards
In OPTINIOD-TV Model 8182A, several' cards are shared with other Orban proqucts.
These cards have been equipped with jumpers to determine their mode of operation.
This
Appendix provides, on a card- by- card basis, a quick reference to the normal
positions of these jumpers in an 8182A installation.
Jumper diagrams are provided on the card assembly drawings found in Appendix J.
Card #0/1:
These cards have no jumpers.
Card # 2:
Jumper " A" should be
in the " Card 8/9" position
in
a single- chassis
installation,
and
in
the " Card
3/4"
position
in
a dual- chassis
installation. ( This jumper
activates or
defeats deemphasis before the
Loudness Controller control circuitry.)
Jumper " B" should be in the " ON" position if you wish the Loudness
Controller to come up ON when AC power is turned on, and should be
in the " OFF" position otherwise.
Card # 3/4:
The
jumper
on
these cards ( not
identified with a letter) determines
the gain of the 20dB pad ahead of the input differential amplifier, and
should
be
set
according
to
the
nominal
level
on
the
line
driving
OPTIMOD-TV.
Card #5:
This card has no jumpers.
Card # 6:
Jumper " A" is normally in the " 8182A" position. ( It is moved to the
other
position only if Cards # 0 and # 1 are removed for servicing.) It
and Jumper " C" activate normally dormant clipper circuitry on Cards
#8 and # 9.
Jumper " B"
is
normally
in
the " normal"
position. ( Its
links
are
removed and placed on the Jumper " C" pins if Cards # 0 and # 1 are
removed for servicing.)
Jumper " C" normally has no links on its pins.
Rotating
the
links
on
this
card
by
90
degrees
in
pairs
swaps
the
output channels for troubleshooting.
Card #7:
Jumper " A"
determines
whether
the
OPTIMOD-TV
output
and
the
drive
to te noise reduction encoder is in LIR or
in L+R/L-R ( sum-
and- difference)
mode.
Placement
is
thus
is
dependent
on
the
requirements of your installation.
In
mono
installations, Jumper " A" is normally in
the "L/R" position.
Card #8/9:
Jumper " A" is normally in the " 8182A" position. ( It is only moved to
the
other
position
to
enable
the
auxiliary
clipper
circuitry
to
be
utilized if Cards # 0 and # 1 are removed for servicing.)
Jumper " B" is always in the " normal" position.
H-1
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