958-31
REV. B
IO.7
MOTHER
BOARD TEST
POINTS
The
Mother Board
is the interconnect
junction
for
each
of the
assemblies.
The
8
transi-stors driving
the indicator
for
each
of
functions
are
located on this
board:
cAL
-
Ql
our2
-
Q5
ruN
-
Q2
ALM2
-
Q6
MAN
-
Q3
oUTl
-
Q7
REM
-
Q4
ALMI
-
Q8
If the logic
signal level is norrnal
on Pl
or P2 connector
and
the
does not
operate trace
the
signal throueh
RNI resjstor
network
I
then collector
Ql
-
Q8
transistor
to the
dlsplay
board connector
-
Ql
-
Q8
TRANSISTOR
COLLECTOR
I,A.I',IP ON
-
+5
VDC
LAMP OFF
.
-38
VDC
10.8 KEYPAD CIRCUIT
(P4
Connector
P4
-
Pins
5 and Prn 6
(KRO.
KRl)
Connect,or
Pulses will ALI.TIAYS be
present
on KRO and KRI
and Prns
No
pulses
should appear at P4 Pins 1 to 4 until
a key
timing interval
is dlfferent.
P4 Connector
-
Keypad
Tnput
l
4 e1ectronic
the
fo
l
lowtng
rndicator
lamp
o t.he
hase and
P6.
5 and
6 of L'4
connector.
fs
pressed.
KRO
anrl KRI
continuity
check wrth P4
is verif
ied,
PRNSS
PI]I,SES APPEAR
AT
DiSPLAY
oR
LAST
-
Prn 4
(KCl)
N0 or START/ST0P/RESET/AIJTO
-
Pin 3
(KC2)
YES or AUTOi MANUAL,/PAUSE/PARAM
-
Prn 2
(KCl
)
PARAM CHK
0R RETURN
-
Pin I
(KC0)
If
puises
do
not appear as indicated then
perfornr
a
removed
arrd the
AC
power
off. Replace keypad if defect
COMMUNI CATION
TROUBLESHOOTING
P4
l0
.9
The repair
of a commllnications board is a factory
procedure.
However,
schematics and
parts
lists
have been
provided.
Most
problenLs
wr
th the
communications
option result fronr the inst,allation.
To aid
jrr
trrrttbleshrroting
the application, the
following most
corifiLon
installation
farrlts
are listed:
I
.
Make sure that
the f orrnat switches
on the COMM board have
lrr:r.n
sel
wt th t he
baud rate,
parity,
handshake and unlt addr-ess to match
the host.. Refer
to
the instal lation manual
f or set
ti-ng i-nf orrnat ion.
2. Make sure that the line dr-op in
the leads
frorrr the external
power
sttpply
for lso1ated communicatfons to the Series
2000 controLler
is
not
excesstve
and that the
pulse
levels at the
reclevers are sufflcient
to
be recogtrized.
LFE
Instr-unents
Division
-to2-
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