KEYENCE BL-700 Series - Manual (Page 148)

Appendices
134
Appendices
Appendix G Troubleshooting
If a problem occurs during operation, please check the following troubleshooting
notes first. If you cannot fix the problem, contact KEYENCE or your nearest dealer.
Bar codes cannot be read.
Check whether power is applied to the unit.
•
Confirm that the power supply voltage and capacity is 5 VDC±5% and 510 mA.
Check the wiring of the power supply unit and the trigger input terminal.
➮ See P.6 to 7.
Connecting the power supply unit with the reverse polarity may damage the BL
series.
If the BL-700 does not operate, contact KEYENCE.
• When using the power supply unit BL-U1, BL-U2, N-42 or N-48, check wiring of
the power supply unit, power switch (for the BL-U1 only) and wiring of trigger
input (see P.8 to 22).
• Check whether the laser stop command (LOCK, see P.92) has been sent to the
BL series. If so, send the laser stop reset command (UNLOCK).
If a laser stop command has been executed, the bottom LED on the STABILITY
indicator will be flashing
Check the bar code setting (type, No. of digits).
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 P.136.
➮ For CODE128, see P.137.
Check the distance and angle between the BL-700 and bar code.
Check the distance and angle while referring to “Mounting angle and mounting
distance” on page 26.
Check the bar code margins (quiet zones).
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.
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 “Reading range characteristics (Typical)” on page 122 to 123.