Kyocera FS-1050 Service Manual - Page 132
Call service 4200 - Laser scanner unit [Pin photo diode] error
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(5) Call service 4200 - Laser scanner unit [Pin photo diode] error Call service 4200 +5 V DC at pin 6 of YC07 on main board (KP-888) ? Yes Connect oscilloscope to pin 4 (OUTPEN) of YC07 on main board (KP-888). Turn power switch off, then on. Does pin 4 (OUTPEN) of YC07 on main board (KP-888) goes high, then low before "4200" ? Yes Connect oscilloscope to pin 4 (OUTPEN) and pin 8 (PDN) of YC07 on main board (KP-881). Turn power switch off, then on. No Replace main board (KP-888). See page 5-12. Replace main board (KP-888). See page 5-12. Turn power switch on. No No OK? Yes End. Replace engine board (KP-882). See page 5-11. Turn power switch on. No OK? Yes End. Does pin 8 (PDN) of YC07 on main board (KP-888) output pulse signal*, within 0.1 second after pin 4 (OUTPEN) goes high, then *: Pin photo diode low? detect horizontal No synchronization signal (Frequency: 1700 Hz, Low level width: 10 µs) B Continued to next page. Replace main board. See page 5-12. Yes C Continued to next page. FS-1050 6-12