Studio Technologies ISS - Manual (Page 22)

ISS User Guide Issue 3, June 1990
Studio Technologies, Inc. Page 23
ISS
and lock it in your desk. Practice saying to
everyone at your station, “Gee, I’d love to
let you adjust the ISS but it’s preset at the
factory.”
Using the Extender Card Assembly
An Extender Card Assembly can be pur-
chased to allow testing and maintenance of
individual ISS cards. Since signals connect
to an ISS card at both its’ front and back
edges, a rather unique extender arrange-
ment has been devised. The Extender Card
Assembly consists of four parts: Extender
Cards 1 and 2, a 34-position ribbon exten-
sion cable, and a 20-position ribbon exten-
sion cable. To use the Extender Card
assembly:
1) If the ISS is currently on-air, arrange to
patch around the unit. Even though the
Transfer Relay Assembly can be used
to send the input audio to the audio
output connectors, it is better not to be
working on equipment when a minor
slip of the hand can result in on-air
errors. After patching around the ISS,
proceed.
2) Turn the ISS main power to the OFF
position.
3) Remove the ribbon cable bus from the
cards until the specific card to be ser-
viced is disconnected. You don’t have
to remove the entire ribbon cable bus.
4) Remove the card to be serviced.
5) Install either of the two connectors on
the 34-position ribbon extension cable
into the connector marked P1 Extension
on Extender Card 1 (the larger card).
The colored stripe (usually red) indi-
cates pin 1 and should be mated ac-
cordingly.
6) Install Extender Card 1 with the at-
tached 34-position ribbon extension
cable into the mainframe card slot
previously vacated by the card to be
serviced.
7) Reconnect the ribbon cable bus to
Extender Card 1 and to the other cards
that were previously detached.
8) Install one connector on the 20-position
ribbon extension cable into the connec-
tor marked P2 Extension on Extender
Card 1. (Extender 1 was just installed in
one of the mainframe’s card slots.) This
connector is directly above the connec-
tor that mates with the ribbon cable
bus. The colored stripe (usually red)
indicates pin 1 and should be mated
accordingly.
9) Install the other end of the 20-position
ribbon extension cable into connector
P2 on the card to be serviced. Ensure
that pin 1 is mated with pin 1.
10) Install the free end of the 34-position
ribbon extension cable to the connector
marked P1 Extension on Extender Card
2. Ensure pin 1 connects to pin 1.
11) Mate the card edge connector on
Extender Card 2 with edge card plug
P1 on the card under test. Ensure that
pin 1 mates with pin 1. The components
on the card under service and the test
points on Extender Card 2 should be
facing up.
12) Double check that all connectors are
mated correctly and pin 1 goes to pin 1
on all connectors.
13) Place the card (with the attached Ex-
tender Card 2) on a non-conducting
surface to protect the components from
accidental shorting.