Acroprint TQ600 (software version 4.x and above) - Manual (Page 54)

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5.
Q: The terminal beeps when the communication connection is
made.
A: When using the RS-232 connection insure that the baud rate of
the PC and terminal are matched.
6.
Q: Fingerprints have a high rejection rate.
A: Possible Causes:
1) Dirty sensor
2) Damaged sensor prism
3) Loose fingerprint reader connection
4) Damaged chip on PCB
Correction:
1) Clean sensor (see Cleaning instructions, Chapter 10)
2) Contact dealer or Acroprint for replacement of the prism.
3) Contact dealer or Acroprint.
4) Contact dealer or Acroprint.
7.
Q: The terminal is communicating, but the attendance
records are not correct in the system.
A: Lower the baud to 19200 or 9600 and confirm if the records
are correct.