Minolta EP5000 General, Mechanical/Electrical page 327

Interleaf EP5000/EP4000 TROUBLESHOOTING
97.04.01
1156SBT040108A
C0E## Erase Lamp Malfunctions
* Code Description
Main Erase Lamp LA2's failure to
C0E00
turn ON
Main Erase Lamp LA2 turning ON
C0E01
at abnormal timing
Image Erase Lamp LA3's failure to
turn ON
C0E20
1156SBT040109A
C0F## Sensor Malfunctions
* Code Description
Original Size Detecting Board UN2
malfunction
* C0F02
AE Sensor Board PWB-H malfunc-
tion
C0F10
AIDC Sensor Board PWB-G varia-
tion correction failure
* C0F20
AIDC Sensor Board PWB-G grid
voltage (Vg) correction failure
* C0F22
AIDC Sensor Board PWB-G expo-
sure correction failure
* C0F23
Detection Timing
The LA2 Failure Detection signal remains HIGH
for a continuous 1-sec. period while LA2 is ON.
The LA2 Failure Detection signal remains LOW
for a continuous 1-sec. period while LA2 is OFF.
The LA3 gate array is faulty as found through a
self-diagnostic sequence carried out immediately
after Main Drive Motor M1 has been deener-
gized.
Detection Timing
D Undefined data is input to the master CPU.
D Under normal conditions:
A fixed-cycle pulse signal (Busy) remains HIGH
or LOW for 3 sec. or more.
D When the Power Switch is ON:
A fixed-cycle pulse signal (Busy) remains HIGH
or LOW for 5 sec. or more.
The output from PWB-H remains approx. 0.18V
or less for a continuous 2-sec. period, with the
Exposure Lamp OFF, the Scanner at the home
position, and the Original Cover lowered.
In the initial F5 or FF mode:
D The output from PWB-G is 1V or more when the
load resistance is made maximum by the 4-bit
analog switch.
D The output from PWB-G is less than 1V when the
load resistance is made minimum by the 4-bit
analog switch.
D The output from PWB-G does not fall within the
0.9V-1.1V range when the intensity of PWB-G
LED is varied.
In the initial F5 or FF mode:
1) Vg of 580V is output.
2) A solid black pattern is produced and the
PWB-G output is sampled.
3) If the average is less than 4.3V, Vg is in-
creased.
In the initial F5 or FF mode:
1) The Exposure Lamp is turned ON with
58V.
2) A halftone pattern is produced and the
PWB-G output is sampled.
3) If the average does not fall within the tar-
get range, the exposure level is varied.
4) The average does not fall within the target
range even after steps 1) to 3) have been re-
peated 15 times.
T-52