NOTE If the STPL_HP signal does not revert to "H" after changes from "H" to "L", the staple
stacker driver reverses the stapling motor once. If the STPL_HP signal changes from "L" to "H"
during reverse rotation, the staple stacker driver determines a staple jam and notifies the
formatter.
Staple self prime detection
The staple stacker detects the staple self prime whenever replacing with a new staple cartridge. The
staple stacker driver monitors the SELF PRIME (STPL_RDY) signal from the self prime sensor. This
detection is activated when the staple stacker driver detects the STAPLE PRESENCE (STPL_LOW)
signal "H" after it has detected the STPL_LOW signal "L" once. When the signal is detected as "H", it
means that the staple cartridge is replaced. When the staple stacker driver detects the STPL_RDY signal
"H", it performs the stapling operation until the STPL_RDY signal goes "L". However, if the STPL_RDY
signal stays "H" after 11 repeated stapling operations, the staple stacker driver determines the self prime
failure, stops the loads, and notifies the formatter.
Staple level detection
The staple stacker detects the remaining staple level. The staple stacker driver monitors the STAPLE
PRESENCE (STPL_LOW) signal from the staple presence sensor. When the staple stacker driver
detects the STPL_LOW signal "L", it determines that 20 staples remain and warns the formatter. Then,
when 20 stapling operations have been performed, the staple stacker driver notifies the formatter of the
staple out condition.
176 Chapter 4 Theory of operation ENWW
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