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Section Vlll
SERVICE
GROUP A
Model 3455A
A10U34
and U3S,
plus associated
circuits.
Lines
F0 and
FI
transfer
data
from
outguard
to
inguard
F0
is
the
data
transfer
line
and
FI
is
the
data
transfer rate
line),
while
F2 and F3
send data
from
in-
guard
to
outguard (F2
is
the
handshake
line
and F3
is
the
data
transfer
line).
b.
HAZ
line
must
be
high,
if
not.
check
TPIO.
c.
Use
the
Inguard/Outguard
transfer
circuit
troubleshooting
diagram
(Figure
8-H-17)
for further
troubleshooting.
d.
The
inguard
power
supply
regulators
(10U36
to
U39) can
also
cause
transfer
problems.
The
outguard should
power up
after
the inguard.
Check
for
a
slow
(more
than
2(X1
msec) inguard
power
supply.
8-42
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