Okidata Microline 520 Service Handbook
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Brand: OKIDATA
Category: Printer
Type: Service handbook
Model: OKIDATA Microline 520 , OKIDATA Microline 521
Pages: 321
CAUTION:
Always check that all connectors on the printer are making good contact.
Reference
Number
Failure Description Cause Recommended Action
14 EEPROM Alarm No reaction when the MPU
reads data.
Replace the main control board
15 Watchdog Timeout Alarm MPU hung up Power OFF, then ON.
16 NMI Signal Alarm NMI port of MPU kept low Replace the main control board
17 BRK Instruction Alarm FFFF data detected due to MPU
hang up
Replace the ROM on the main
control board
18 MPU Internal RAM Alarm Read/write error Replace the interface board.
19 ROM Alarm Check sum error Replace the interface board
20 RAM on I/F Board Alarm Read/write error Replace the interface board.
Then, replace the main control
board
21 Interface not Connected Serial interface board not
detected.
Replace the interface board.
Then, replace the main control
board
22 Paper End Alarm From the cut sheet feed or
bottom feed paper end
Check paper supply.
Refer to RAP 04
23 Paper Change Lever Alarm Change lever is set for top feed
while paper is inserted from rear
or bottom.
Set the lever to the specified
position. Check the rear sensor
lever. Replace the main control
board
24 Cut Sheet Jam Cut sheet could not be fed
properly.
Remove the paper. Check the
feed mechanism. Press SEL.
25 Printhead Thermal Alarm Printhead temperature exceeds
118 degrees
Wait until the printhead cools.
The printer should resume
printing. If the problem persists,
replace the printhead. If that
does not solve the problem,
replace the main control board
26 Space Motor Thermal Alarm Temperature of space motor
exceeds specified value
Wait until the space motor cools.
The printer should resume
printing. If the problem persists,
replace the space motor. If that
does not solve the problem,
replace the main control board
Microline 520/521 Service Handbook 4 - 21 Failure Analysis
P/N 59257803