Specifications

PERFORMANCE TESTS
1-15. HANDLER INTERFACE FUNCTION TEST (OPTION
201
ONLY)
Perform this test only when troubleshooting the Option
201
Handler Interface Board.
This test verifies the Option
201
handler interface functions.
EQUIPMENT:
Handler Simulator
HP
PN
04278-65001
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 /VOLT AGE 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 toward rear and lift it off. The top shield plate will be visible.
5. Remove the top shield plate to expose the PC boards.
6. Disconnect the flat cable from the handler interface board, the board
with
ORANGE and a
RED
extractors. See Figure 1-20.
0
0
J
~
V
~
t---
-'
0
I='
Handler Interface Board (A30/A31)
3
[J
.
0
.
-
I-
0
Accessory Control Interface Board (A50)
0
'-
~
n
J""LJ"'L1"1.~
I
Scanner Compensation/Interface Board (A40)
Figure 1-20. Interface Board Locations
1-34