66-031
Maintenance
Table
Station Pairing
2 .
3 .
Press and hold the station 10 select key while
reconnecting the line cord plug to the line.
IMPORTANTNOTE: THE COMPANION
WILL BE DISABLED DURING THE
THE CONSOLEIS BEING DISCONNECTED AND
RECONNECTED.
Release the station 10 select key, and note
that
the BLF indicators will each
turn
on in sequence
beginning with the station 10 indicator. The in-
dicators will then turn off and the console will be-
come operational.
Paired Stations
. .
ne
All stations are even/odd paired on the data lines as
shown in Table 4-l. Station 10 is paired with station
etc. If erratic light indications or
signals occur
at a paired station, an open data pair at either station
may be the fault. A station with an open data line
may work properly on a short loop but fail on a long
loop. Test the station wiring per the checkout proce-
dure given in Chapter 2.
. .
Overload
All stations are paired as shown in Table 4-l for over-
load current protection. If a fault occurs which
causes more than 300 ma. of current to be drawn, the
paired stations are disabled by circuit action. Discon-
nect the disabled stations and reconnect them one at
a time
to
isolate the faulty one.
Failure Analysis
Figure 4-l details a failure analysis flow chart to as-
sist a service technician in isolating a failure in a
defective system. One way to isolate a failure is to
substitute a known good assembly for a suspected
one, This is the recommended failure isolation
method to use with the system.
Connecting and disconnecting stations
to the
system
does not affect the stored station auto/speed dial
memory data. This data is stored in the KSU memory
and not at the individual stations. Replacing the
KSU, however, causes all stored memory to be lost.
This includes all memory dialing numbers as well as
all COS programming data.
4-2
