Scanning Block - Panasonic KX-FP80C Service Manual

according to IC501 pin 2. Depending on that value, the strobe
width is recorded in ROM (IC502). Accordingly, the strobe width is
determined.]
When the thermal head is not used, the IC501 (23, THON) becomes
low , Q501 turns OFF, IC506 turns OFF, and the +24V power supply
for the thermal head driver is not impressed to protect the IC.

6.4.4. SCANNING BLOCK

The scanning block of this device consists of a control circuit and a contact image sensor made
up of a celfoc lens array, an LED array, and photoelectric conversion elements.
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