Gestetner B147, Service Manual

Page: 245 / 1081

SC TABLE
SM 4-43 B147/B149/B190
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 751 Booklet finisher
punch-unit
sensor error 1
The paper edge and size
sensors receive the 2.5-volt
light or weaker light even when
the source emits 4.4-volt light.
• Defective sensors
• Dirty sensors
1. Turn the main switch off and on.
2. Clean the sensors.
3. Replace the sensors. B
SC 752 Booklet finisher
punch-unit
registration
motor error
•
The registration motor
drives the slide unit to the
rear side for 1 second. But
the home position sensor
does not turn on.
• The registration motor
drives the slide unit to the
front side for 1 second. But
the home position sensor
does not turn off.
•
Incorrect assembly of
the registration motor
•
Loose connection of
the registration motor
•
Defective home
position sensor
• Loose connection of
the home position
sensor
1. Turn the main switch off and on.
2. Check the connection of the
registration motor.
3. Check the connection of the home
position sensor.
4. Replace the home position sensor.
5. Replace the registration motor.
B
SC 753 Booklet finisher
punch-unit
punch motor
error
• The punch motor starts to
drive the punch cams. But
the controller does not
receive the encoder-lock
signal for 60 milliseconds.
•
The punch motor start to
drive the punch cams. But
the home positions sensor
does not turn on for 250
milliseconds.
• Malfunction of the
punch motor
• Loose connection of
the punch motor
•
Defective home
position sensor
•
Loose connection of
the home position
sensor
• Loose connection of
the encoder sensor
•
Defective encoder
sensor
1. Turn the main switch off and on.
2. Check that the connection of the
punch motor.
3. Check the connection of the home
position sensor.
4. Check the connection of the encoder
sensor.
5. Replace the home position sensor.
6. Replace the encoder sensor.
7. Replace the punch motor.
B
SC 754 Booklet finisher
punch-unit
sensor error 2
The A/D inputs of the sensor
are not corrected by varying
the D/A outputs. • Defective sensor
•
Dirty sensor
1. Turn the main switch off and on.
2. Clean the sensors.
3. Replace the sensors. B
SC 818 Watch-dog
error
While the system program is
running, other processes do
not operate at all. • Defective controller
•
Software error
1. Turn the main switch off and on.
2. Replace the controller.
3. See
NOTE 1 at the end of the SC
table
CTL