V
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I
F
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N E
C
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I D
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T I
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M
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M
X
800 S
ERIES
I
NSTALLATION
G
UIDE
25
C
HAPTER
4
Troubleshooting
During normal, day-to-day operation of your M
x
800 Series series terminal, it is
possible that minor malfunctions can occur. Following are some examples of
possible problems, and steps to resolve them.
VeriFone follows stringent quality control standards in the manufacture of M
x
800
Series terminals. Each unit that leaves the factory receives numerous tests to
ensure quality and reliable operation. However, should you encounter a problem
in operation, read this section for possible causes and solutions.
The troubleshooting guidelines provided in this section identify various problems
and suggest appropriate corrective action(s). If you have problems operating your
M
x
800 Series terminal, please read through these troubleshooting examples. If
the problem persists or if it is not described below, contact your local VeriFone
representative for assistance.
Blank Display
The following are the corrective steps taken if the terminal display does not show
correct or readable information:
1
Check all cable connections.
2
If the problem persists, contact your local VeriFone representative for
assistance.
Serial Port Does Not
Work
The following are the corrective steps taken if the serial port does not work:
1
Check that the device connected to the serial port of the multiport cable of the
M
x
800 Series terminal has power and is functioning correctly. If possible,
perform a self-test on the device.
2
The cable connecting the optional device to the M
x
800 Series terminal serial
port may be defective. Try a different serial cable.
3
If the problem persists, contact your local VeriFone representative for
assistance.
NOTE
•
Perform only those adjustments or repairs specified in this guide. For all other
services, contact your local VeriFone distributor or service provider. Service
conducted by parties other than authorized VeriFone representatives may
void the product warranty.
•
The M
x
800 Series terminal comes equipped with tamper-evident labels. Do
not, under any circumstance, attempt to disassemble the terminal.