Toshiba E-STUDIO520, Service Manual, Page: 355 / 592

March 2005 © TOSHIBA TEC e-STUDIO520/600/720/850 TROUBLESHOOTING
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[E120] Bypass misfeeding (paper not reaching registration sensor)
Open the bypass unit cover. Is there any paper in front of the registration sensor?
!
YES
"
Remove the paper.
NO
Is the registration sensor working?
(Perform the input check in the test mode: 03-[FAX]ON/[4]/[E])
l
l
l
l
l
l
l
l
!
NO
"
1) Check if the connector of the registration sensor is disconnected.
2) Check if the connector CN341 on the LGC board is disconnected.
3) Check if the connector pins are disconnected and the harnesses are
open circuited.
4) Check if the conductor pattern on the LGC board is short circuited or
open circuited.
5) Replace the registration sensor.
6) Replace the LGC board.
YES
Is the width of the side guides of the bypass unit too narrow?
Is the paper skewed?
!
YES
"
Match the width of the side guides and that of the paper.
NO
Is the bypass feed clutch working? (Perform the output check in the test mode: 03-204)
Is the bypass feed sensor working? (Perform the input check in the test mode: 03-
[FAX]OFF/[6]/[G])
l
l
l
l
l
l
l
l
l
!
NO
"
1) Check if the connector of the bypass feed clutch and bypass feed
sensor are disconnected.
2) Check if the connector CN327 on the LGC board is disconnected.
3) Check if the connector pins are disconnected and the harnesses are
open circuited.
4) Check if the conductor pattern on the LGC board is short circuited or
open circuited.
5) Replace the bypass feed clutch and bypass feel sensor.
6) Replace the LGC board.
YES
Check the bypass transport roller, feed separation and separation rollers.
Clean or replace them.