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November 2003 © TOSHIBA TEC 5 - 117 e-STUDIO3511/4511 TROUBLESHOOTING
Cause/Section
High-voltage
transformer
(1st/2nd transfer roller
and developer bias)
Developer unit
Drum
Transfer unit
Switching power
supply
Harnesses for SLG,
SYS, LGC and LDR
boards
Laser optical unit
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Check items
Is the high-voltage transformer output
defective?
Are the connector of the high-voltage
harness securely connected? Is the
harness open circuited?
Is the developer unit installed securely?
Do the developer sleeve and mixer
rotate?
Is the developer material properly
transported?
Is there any magnetic brush phase
error?
Is the doctor sleeve gap incorrect?
Is the drum rotating?
Is the drum grounded?
Is the transfer belt in proper contact with
the drum?
Is the transport of the transfer belt
normal?
Is the releasing movement of the
transfer belt cleaner is normal? (Does
the cleaning blade stay in contact?)
Is the 2nd transfer roller contacted and
released properly?
Is the power supply output (5.1VD)
normal?
Are the connectors securely connected?
Is any harness between the boards open
circuited?
Was the protection seal of slit removed
when replacing the unit?
Measures
Adjust the output and correct the circuit,
or replace the transformer.
Reconnect the harness securely.
Replace the high-voltage harness.
Check/correct the developer sleeve
coupling engaging.
Check/correct the developer drive
system.
Remove foreign matter from the devel-
oper material, if any.
Check the developer pole position.
Adjust the gap with the doctor-sleeve
jig.
Check that the drum shaft is inserted.
Check the drum drive system.
Check the contact of the grounding
plate.
Check if the contact releasing lever is at
releasing position. Check the installation
of the transfer belt.
Check the installation of the transfer belt
or transport mechanism.
Check the installation of the transfer belt
cleaning blade. Check the operation of
the transfer belt cleaner clutch.
Check the connection of the connector
of 2nd transfer roller contact clutch and
open circuit of harness.
Replace the switching power supply.
Reconnect the connectors securely.
Replace the harness.
Remove the protection seal.