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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