Communication Related Service Call - Sharp AR-650 Service Handbook

4.4 Communication Related Service Call

[C56] Communication error between PFC and M-CPU
(1) Check the signal patterns (REQ, ACK, RXD, TXD) between IC11 (G/A) and IC21 (PFC) on the
LGC board for open-or short-circuits.
(2) Replace the LGC board.
[C57] Communication error between M-CPU and IPC
(1) Check the circuit patterns mainly on IC50 and IC56 on the LGC board for open-or short-
circuits.
(2) Check the pattern on the IPC board for open-or short-circuits.
(3) Replace the IPC board.
(4) Replace the LGC board.
[C58] Communication error between IPC and the finisher
(1) Make sure that only the specified finisher is attached.
(2) Check the pattern on the IPC board for open-or short-circuits.
(3) Check the harness connected to connector J2 on the IPC board for disconnected pins and
open-circuits.
(4) Check fuse F5 on the power supply unit to see if it is blown.
(5) Check the pattern on the control board inside the finisher for open-or short-circuits.
(6) Check the connectors leading up to the PPC board for disconnected pins and the harness for
open-circuits.
(7) Replace the IPC board.
(8) Replace the LGC board.
[C59] Communication error between M-CPU and L-CPU
(1) Check the harness between the LGC board and the laser unit for disconnection and open-
circuits.
(2) Check mainly the IC circuits on the LGC board for open-or short-circuits.
(3) Replace the LGC board.
(4) Replace the laser optical unit.
[F07] Communication error between SYS and LGC boards
[F11] Communication error between SYS and SLG boards
(1) Check the connectors J102 and J108 on the SYS board for disconnection.
(2) Check the connector J330 on the LGC for disconnection.
(3) Check the connector J2 on the SLG board for disconnection.
(4) Check the harness between the SYS and the SLG for breaks and disconnected pins.
(5) Check the harness between the SYS and the LGC for breaks and disconnected pins.
(6) CHECK THE FROM version on the SYS board.
(7) Check the MROM (IC36) version on the LGC board.
(8) Check the SROM version on the SLG board.
(9) Replace the SYS board.
(10) Replace the SLG board.
(11) Replace the LGC board.
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