Kyocera FS-1050 Service Manual - Page 130
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(4) Call service 4000 - Laser scanner unit [Polygon motor] error Call service Ca4l0l00service 4000 +24 V DC at pin 5 of No YC06 on engine board (KP-882) ? Replace engine board (KP-882). See page 5-11. Yes Connect oscilloscope to pin 1 (PLGCLK) and pin 3 (PLGDRN) of YC06 on engine board (KP-882). Replace engine board (KP-882). See page 5-11. Turn power switch on. Replace laser scanner unit. See page 5-29. Turn power switch on. Turn power switch off, then on. Does pin 3 (PLGDRN) of YC06 on engine board No (KP-882) goes high, then low? Yes Does pin 1 (PLGCLK) of YC06 on engine board (KP-882) output square-wave* signal? Yes No *: 1417 Hz (705 µs) Connect oscilloscope to pin 2 (PLGRDYN) and pin 3 (PLGDRN) of YC06 on engine board (KP-882). A Continued to next page. No OK? Yes End. No OK? Yes End. Does pin 2 (PLGRDYN) of YC6 on engine board (KP-882) goes high, then low, within 8 seconds after pin 3 (PLGDRN) goes high, then low? No Replace laser scanner unit. See page 5-29. Replace harness (S02779) between engine board and laser scanner unit. Yes Replace engine board (KP-882). See page 5-11. Turn power switch on. Turn power switch off, then on. No OK? Yes End. Replace harness (S02779) between engine board and laser scanner unit. FS-1050 6-10