640
M
I
NSTALLATION
G
UIDE
3
1
C
HAPTER
6
Troubleshooting Guidelines
This chapter lists malfunctions that may occur while operating a 640m device and
the appropriate corrective action. If the problem persists – even after performing
the outlined guidelines, or if the problem is not described, contact your local
Verifone representative for assistance.
Display Panel
Does Not Work
Use the following steps to check the display panel:
1
Check all the cable connections.
2
Check the controlling device's AC outlet to be sure the outlet is supplying
sufficient power. Substitute the controlling device's power pack with another
power pack.
3
The controlling device's application program might not be loaded correctly.
Download the application program and try again.
4
If the problem persists, contact your local Verifone representative.
Keypad Does
Not Respond
Use the following steps to check the keypad:
1
Check the display panel. If there are no characters, or the wrong characters
are displayed, refer to
.
2
If the problem persists, contact your local Verifone representative.
Transactions
Fail to Process
There are several possible reasons why the unit may not be processing
transactions. Use the following steps to troubleshoot failures.
Check Smart Card Reader
•
Perform a test transaction using several different smart cards to ensure the
problem is not a defective card.
•
Ensure that the card is inserted correctly.
•
Ensure the SAM/SIM cards are properly inserted in the slots and are properly
secured (see
).
•
If the problem persists, contact your local Verifone representative.
NOTE
The 640m device uses a tamper-evident case and contains no user-serviceable
parts. Do not, under any circumstance, attempt to disassemble the unit. Perform
only those adjustments or repairs specified in this guide. For all other services,
contact your local Verifone service provider. Service conducted by parties other
than authorized Verifone representatives may void any warranty.
