Ricoh J-P3 Service Manual page 80

SC TABLE
SC No. Item
SC 374 Vt error [K] During the image
development, Vt value is less
SC 375 Vt error [Y]
than 0.78V.
SC 376 Vt error [C]
SC 377 Vt error [M]
SC 386 Development Any of the following conditions
gamma error K happens three consecutive
times:
SC 387 Development
• When the development
gamma error Y
gamma is out of the
SC 388 Development
following range:
gamma error C
0.3 ≤ γ ≤ 6.0
SC 389 Development
• When Vk is out of the
gamma error M
following range:
-150V ≤ Vk ≤ 150V
• Development gamma
calculation error
SC Charge AC: The high voltage supply board
391-01 output error sends the feedback signal
391-01: K (CN228-2 to 5; MCYK). The
391-02: Y BCU monitors these feedback
391-03: M signals every 8 ms. If the
391-04: C average of the sampled data is
not within the control target 20
consecutive times, this SC
code is generated.
SC Drum motor No drum gear position sensor
440- error signal is detected within 0.7
440-001: Black second (185 mm/s), 0.8
001
440-002: Color second (162 mm/s), 1.0
second (125 mm/s), or 2.0
seconds (62.5 mm/s).
Definition Possible Cause
• Poor connection (TD
sensor outputs is less
than 0.5V.)
• Defective TD sensor
• Unsuitable toner
density
• Toner supply
mechanism problem
• Laser exposure
problem
• Image transfer
problem
• Power pack
disconnected
• Charge receptacle or
terminal
• Defective PCU bias
input terminal
• Incorrect power pack
B/C output
• Damaged cable
• Defective BCU
• Defective PCU
• Defective drum motor
• Defective drum gear
position sensor
Related
Troubleshooting Procedure
SCs
1. Turn the main switch off and on.
2. Reset the related color development
unit.
3. Replace the related color
development unit.
1. Turn the main switch off and on .
2. Check the process control self-check
result (SP3-975). If the result is not
"1", fix the problem according to the
table in section 4.1.2.
3. Print a full color image by disabling
SC detection (SP5-809-001) and
check if the image quality is OK. If the
image quality is not OK, fix the
problem. Then, enable the SC
detection again.
1. Turn the main switch off and on.
2. Check the connector.
3. Check the PCU charge voltage input
(the spring/conducting shaft) or
replace the PCU.
4. Replace the power pack B/C.
5. Replace the cable.
6. Replace the BCU.
1. Turn the main switch off and on.
2. Check and/or replace the PCU.
3. Check and/or replace the sensor.
4-6
20 February 2004
Type