Frontier LP7700 - Page 328

3. Mode
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Self-diagnostic
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! Printer control PCB - Processor control PCB
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! Printer control PCB - Laser control PCB
Printer control PCB (black) ⇔ Processor control PCB (white) Printer control PCB (white) ⇔ Processor control PCB (black)
Printer control PCB (black) ⇔ Laser control PCB (white) Printer control PCB (white) ⇔ Laser control PCB (black)
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