Self Diag Functions - Sharp Z-21 Service Manual

2. Self diag functions

When a trouble occurs in the machine, the display indicates it and the machine stops immediately.
The display section differs in the Z-21 and in the Z-26.
<List of the self dial functions>
Display
Z-21
All indicators except for the ready
indicator blink.
All indicators except for the ready
indicator blink.
All indicators except for the ready
indicator blink.
All indicators except for the ready
indicator blink.
All indicators except for the ready
indicator blink.
All indicators except for the ready
indicator blink.
Note
•
The Z-26 provides "P" display for paper feed error display, and paper empty display.
•
A thermostat (which is open at 165 C) is provided to prevent against abnormally high temperature in the fusing section.
[Reference]
Since the Z-21 has no copy quantity display, the trouble codes are not displayed.
When the display PWB of the Z-26 is connected to the Z-21, however, the trouble codes can be checked similarly with the Z-26.
Content
Z-26
After the motor starts rotation, the table
L3
sensor (TPSP) signal keeps unchanged for 15
sec.
The motor rotary encoder (MRE) signal keeps
L4
unchanged for more than 50ms after turning
on the power or after returning to the auto
shut off state.
•
AE sensor output abnormality
L8
•
The read value (AESP signal) of the white
mylar section in the back of the table glass
detected by the sensor is 0.2V or less.
•
Full wave signal is not inputted for more
than 1.5 sec.
Thermistor open detection
H2
H3 Abnormally high temperature of the heater
roller
When the fusing temperature reaches 180°C.
Abnormally low temperature of the heater
H4
roller
•
When a low temperature of 100°C is
detected for more than 3 sec during
copying.
•
The temperature does not reach 149°C
within 40 sec after turning on the power or
after auto shut off.
– 26 –
Major cause
•
Table sensor defect
•
Main PWB defect
•
Power PWB defect
•
Drive unit defect
•
Motor defect
•
Motor rotary sensor defect
•
Main PWB defect
•
An abnormal load is applied to the drive
section to prevent the motor from rotating
normally.
•
AE sensor defect
•
Dirt on the light receiving section of the AE
sensor
•
White strip on underside of glass is dirty.
•
Copy lamp disconnection (breakage) (Does
not light up.)
•
Power PWB defect
•
Main PWB defect
•
Thermistor breakage
•
Main PWB defect
•
Main PWB defect
•
Triac defect
•
Heater lamp disconnection (breakage)
•
Main PWB defect
•
Power PWB defect
•
Thermostat open