Print Head Up/Down Detection Mechanism - Tally Dascom 7010 Series Maintenance Manual

2-1. Operation of Each Mechanism

2-1-5. Print Head Up/Down Detection Mechanism

The component of the print head up/down detection mechanism is as follows:
(a) SA, Head Up SW
The print head up/down detection mechanism detects the up (open)/down (close) status of the
head block.
When the head block is in the up position, the switch lever of the SA, Head Up SW is released and
the switch turns OFF. While, the head block is in the down position, it is pushed by the head block
and the switch turns ON.
The CPU on the Main PCB detects up or down position of the head block by sensing the switch
output of the SA, Head Up SW. When the head block is in the up position, the ERROR LED blinks
and the LCD displays "ERROR HEAD OPEN" on the operation panel.
[Rear View]
Head Block
Switch OFF
SA, Head Up SW
Head Block
Switch ON
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