Specifications
PERFORMANCE TESTS
1-18. SUPPLYING
DC
POWER TO THE SIMULATOR
This paragraph describes the procedure for supplying
+5
V
DC
to the Bias Interface Simula-
tor or the Scanner Simulator from the internal circuits of the
HP
4285A interior.
PROCEDURE:
1.
Disconnect
the
power cable from the
HP
4285A and allow enough time
(a
few
minutes), for the
internal capacitors to discharge.
I
WARNING
I
DANGEROUS ENERGY/VOLTAGE EXISTS WHEN THE HP
4285A
IS IN OPERA-
TION,
AND
FOR
A TIME AFTER IT IS POWERED DOWN. ALLOW A FEW MI-
NUTES
FOR
THE INTERNAL CAPACITORS
TO
DISCHARGE.
2. Disconnect the two rear feet which lock the top cover and rear panel together.
3.
Fully loosen the top cover retaining screws located on the rear of the top cover.
4.
Slide the top cover towards the rear and lift it off. The top shield plate will
be
visible.
.
.
J
~
iJ
"-"I
-J
.
-l
3
!J
.
.
.
-
I-
0
~
A7TP2
.
I-
A7TP1
..n
J1.Jl.:[l-I"L-1""l
I
Figure 1-29.
A7TP1
and
A7TP2
Location
5.
Connect
TP2
(GND)
on
the
A7
digital control board to the TP2
(GND)
on the
simulator board. Then connect
TP1
on
the
A7
board to
TP1
(5
V or Vcc)
on
the
simulator board. Figure 1-29 shows the locations
of
A7TP1
and A7TP2.
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