Adex ISAIX16 Benutzerhandbuch - Seite 8

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ISAIX16 User's Manual

TROUBLESHOOTING AND SELF SERVICE

It is possible the Bus Isolation Extender could be damaged during

operation. Our experience has shown, two of the most common

problems associated with the Bus Isolation Extenders are blown

fuses and blown buffer ICs. Such failures are usually caused by:

Users accidentally pull the add-on board while the bus is

still connected. This happens especially when the user is

not yet used to the procedure, and occasionally forget to

switch the extender off while removing the add-on board.

One must observe the red LED to make sure it is not

blinking or listen to the speaker before adding or removing

the add-on board. This action will cause the fuses and the

buffer ICs to blow; especially, the one have signals next to

the power pins. Because the add-on board could be

removed at an angle, which shorted the power pins to the

signal pins nearby.

The extender is lifted or wiggled side to side while add-on

board is being removed or added. This happens

extender is not tied down firmly. It is very important for user

to find an appropriate way to hold down the extenders using

brackets or fixtures in open or closed chassis environment,

to prevent this to happen. Since the Bus Isolation Extender

is still connected to the system bus, this will cause sparking

in both power and signal pins that will most likely damage

the buffer ICs.

Shorted power to signal pins or signal to signal pins on the

add-on board. This condition will usually cause an overload

to the buffer IC and damage it. Do not test the failed add-

on board on the Bus Isolation Extender again until the

cause is corrected.

Extender connector pins are damaged due to wearout or

rough handling. We strongly recommend the use of Bus

Wearout Extenders, especially in production environment.

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Adex Electronics

ISAIX16 User's Manual

We would

troubleshooting and field testing before returning the extender for

factory service.

if the

Our experience shows the buffers ICs at four corners are most

likely to be damaged in the operation. Adex Electronics will assist

customers over the phone to locate the damaged components

and recommend further actions.

provide the components as spare parts to the customers. Each

bus isolation extender is provided with a bag of spare parts, with

2 fuses of each type and 2 buffer ICs.

Adex Electronics

recommend the following steps for user self

Check the extender connector pins for any physical

damage, and correct them if possible.

Check the fuses for continuity and replaced them if not.

Check for all power to ground short. There are over-voltage

protection components on-board that will short to ground

when fired in severe sparking conditions. Locate and

replace the components.

Visually inspect the buffer ICs for physical cracks, burn

marks, etc. When the buffer IC is damaged, it will usually

smoke while the bus is being connected. The damage could

be caused by sparking or ESD from previous operation.

Replace the damaged buffer ICs and try again.

Check buffer ICs by looking at the buffer pins with or

without the add-on board and turn on the extender. The IC

has pin 1 and 10 grounded, pin 20 connected to VCC and

pin 19 as control (low for connect). Pin 2-9 and pin 18-11

are the corresponding buffer pins. Test the pins using a

logic probe. The probe should indicate the same condition;

H, L or blinking on both pins of the buffer pair. Replace the

buffer IC, if the condition is not the same.

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Adex Electronics can also