KEYENCE BL-600 Series - Manual (Page 172)

Appendices
162
Appendices
Appendix F Troubleshooting
If a problem occurs during operation of the BL-600 Series, please check the
following troubleshooting list first. If you cannot fix the problem, contact your
nearest KEYENCE office or distributor (listed at the end of this manual).
Appendix F.1 Bar codes cannot be read
● Check whether or not the laser is emitted.
•
If using the power supply unit BL-U1, BL-U2, N-42 or N-48, check the wiring of
the power supply unit, the power switch (BL-U1 only), and the wiring of the
trigger input terminal.
➮ See pages 16 to 32.
• Check whether or not the laser off command ( ➮ See page 116.) has been sent to
the BL-600 Series. If so, send the resetting laser off command (UNLOCK) to
enable laser emission.
If a laser off command has been executed, the bottom LED in the STABILITY
indicator flashes.
• If a optional power supply unit is not used, confirm that the supplied power
voltage and capacity (5 V DC±5%, 330 mA min.) is correct. Also, check the
wiring of the power supply unit and the trigger input terminal.
➮ See pages 33 to 35.
Note: Connecting the power supply in reverse may damage the product. If the BL-
600 Series does not operate, contact your nearest KEYENCE office or distributor
(listed at the end of this manual).
● Check the bar code settings (type, No. of digits, etc.). Check the following
parameters using the setup software.
• Bar code type, No. of digits.
• Setting of the check digit inspection (enabled or disabled)
• Setting of the label orientation-specified reading
Note: When using CODE39 or Codabar, include the start/stop characters and
check digit in the number of digits.
➮ For CODE93, See page 164.
➮ For CODE128, See page 165.
● Check the mounting distance and angle of the BL-600 Series.
➮ See page 74.
● Check the bar code quiet zones (margins).
A bar code requires the right and left margins to be at least 10 times wider than the
narrow bar width.
If the bar code margins are too narrow, it may not be read. ➮ See page 74.
● Check the bar code label length.
The bar code label length is the lateral length of a bar code including the right and
left margins (quiet zones).
The readable bar code label length is limited depending on the reading distance.
See “Appendix A.2 Reading range characteristics (Typical)” on page 148 to 150.
● Check the printing quality of the bar code.
A bar code with blurred sections, defects or stains may not be read correctly.
Bar codes printed with dot matrix or ink jet printers are prone to such problems.