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Model 4085M
DIAG.ERROR I
A relay failure has been detected in the switching m a
failure will be displayed in the error m essage. Make sure that the I S 075A Relay
Test Adapter is securely fastened to the 4085A, then press softkey Dill (RETRY).
If the same error at the same location is displayed, contact the nearest HP Service
Office. If e mergency repair is necessary, replace the defective pin board. See
paragraph 4-1 9 for details on pin board replacement. If DIAG.ERROR I followed
by the message-A relay is stuci<
relay itself. Refer to paragraph 4-21 for details. To ensure that m ultiple pin board
failures have not occurred, when a failure has been detected, remove the defe<!tive
pin board and rerun the relay test.
DIAG.ERROR 2
Excessive leakage current has been detected in the 4085A, or in the cabling to the
4085A. Contact the nearest HP Service Office.
DIAG.ERROR 3
Excessive leakage current has been detected on a pin board. If a test fixture is
mounted in the I SOSSA, remove the fixture and press softkey Dill (RETRY). If the
same error m essage is displayed, contact the nearest HP Service Office.
4-1 9. PI N BOARD REPLACEMENT
4-20 . I f an error m essage indicating a faulty pin board or relay is displayed as shown
below, the system can be repaired by replacing the pin board.
D I A G .
There are two ways to replace a faulty pin board.
( I ) Replac ement with a spare pin board or a new I S320A pin board.
(2) Replacement with a pin board from another slot. Install a pin board from
another slot, one not frequently used, into the faulty pin board's slot.
Contact the nearest Hewlett-Packard sales office to order new pin boards and to have
faulty pin boards repaired. The procedure for removing and installing pin boards is as
fOllows :
1 . Turn all the instruments off.
2. Using the funished screwdriver, remove the bottom panel from the 4085A.
Then remove the necessary board struts and control bus cables. Refer to Figure
4-S.
Table 4-}' DIAG N OSTICS Error M essages
ER ROR
r e l ay i s
1
A
WHEN REMOVI NG A CONTROL BUS CABLE, DISCO N NECT
EACH CON N ECTOR SEPARATELY. DO
CABLE
BY
DISCO N N ECTING
"PEELING OFF" THE CABLE ALL AT O N CE.
-is displayed, it may be possible to repair the
. . . •
o p e n
< c o n t Olc t s
CAUTION -
O N E
E N D
t
rix. The location of the
.
!; ' i l l p o t MAK E > .
N OT REMOVE THE
A N D
THEN
Section I V -
4-7
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