Ricoh G148, Service Manual

Page: 253 / 537

Vt = 4.0 volts or higher
• IOB defective
• Toner bottle motor defective
• Note: When the TD sensor is defective,
the toner supply is controlled using pix-
el count and the ID sensor.
341 D
TD sensor adjustment error 1
During the TD sensor auto adjustment, the
TD sensor output voltage (Vt) is 2.5 volts
or higher even though the control voltage
is set to the minimum value (PWM = 0).
When this error occurs, SP2-906-1 reads
0.00V.
Note: This SC is released only after correct
adjustment of the TD sensor has been ach-
ieved. Switching the machine off and on
will cancel the SC display, but does not
release ID sensor toner supply.
• TD sensor defective
• TD sensor harness disconnected
• TD sensor connector disconnected or
defective
• IOB defective
• Toner bottle motor defective
• Note: When the TD sensor is defective,
the toner supply is controlled using pix-
el count and the ID sensor.
342 D
TD sensor adjustment error 2
During the TD sensor auto adjustment, the
TD sensor output voltage (Vt) does not en-
ter the target range (3.0 ± 0.1V) within 20
s. When this error occurs, the display of
SP2-906-1 reads 0.00V.
Note: This SC is released only after correct
adjustment of the TD sensor has been ach-
ieved. Switching the machine off and on
will cancel the SC display, but does not
release ID sensor toner supply.
• TD sensor defective
• TD sensor harness disconnected
• TD sensor connector disconnected or
defective
• IOB defective
345 D
Development output abnormal
The high voltage applied to the develop-
ment unit is detected 10 times higher than
the upper limit (45%) of PWM.
• Development power pack defective
• Development bias leak due to poor
connection, defective connector
350 C
ID sensor error 1
4. Troubleshooting
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