
Unit 8: Checking/Adjustment Procedures
GL4xxe Series Service Manual
8-9
HEAD OPEN SENSOR CHECKING
This sensor detects the situation in which the print head has been unlatched via the head lock latch. It is a vital
sensor because many adjustments and operations depend on whether the print head is latched or unlatched. To
check the functionality of this sensor, perform the following:
1. Turn the printer ON.
2. Wait until the printer is ONLINE, and then lift up the Right-Hand side cover to access the print head area.
3. Turn the head lock latch to latch or unlatch the print head. Every time the print head is unlatched (ie, it has
been lifted up away from the platen roller), you should hear a buzzer alarm.
4. The LCD screen should also display the message “Head Open”.
5. If the sensor is not operational, the above testing will not cause the printer to emit any buzzer alarm or status
message on the screen. Check the connections of the sensor cable for preliminary troubleshooting.
6. If the cable appears to be connected properly, replace the head open sensor as described “HEAD-OPEN
SENSOR replacement” on page 7-15.
Figure 8-15. Error Message
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