Frontier LP7500 - Page 326

3. Mode
35941
5/5
35941
Self-diagnostic
Narrowing down the failure location if the failure location cannot be determined
The communication errors occur. Processor control PCB cables are disconnected.
Diagnosis example (values of
RCN and MYRCN on the Printer I/F Main PCB increase)
1. Disconnect two cables that are connecting between the processor control PCB and the printer control PCB.
2. Perform ARCNET Self-Diagnostic again to confirm that the values of RCN and MYRCN increase.
If the values of
RCN and MYRCN do not increase
1. It can be assumed that the cause lies in the connection status of the cables between the processor control PCB and the printer
control PCB.
2. Confirm the connection status of the connector between the processor control PCB and the printer control PCB, then, if no
problem is found, replace the processor control PCB.
☞68100
If the values of
RCN and MYRCN increase
1. With the two cables between the processor control PCB and the printer control PCB disconnected, disconnect also the two
cables between the laser control PCB and the printer control PCB.
2. Perform ARCNET Self-Diagnostic again.
If the values of
RCN and MYRCN do not increase
1. It can be assumed that the cause lies in the connection status of the cables between the printer control PCB and the laser
control PCB.
2. Confirm the connection status of the connector between the printer control PCB and the laser control PCB, then, if no
problem is found, replace the laser control PCB.
☞68100
If the values of RCN and MYRCN increase
1. It can be assumed that the cause lies in the connection status of the cables between the printer control PCB and the Printer I/F
Main PCB.
2. Confirm the connection status of the connector between the printer control PCB and the Printer I/F Main PCB, then, if no
problem is found, replace the printer control PCB or the Printer I/F Main PCB.
IMPORTANT
• For details about ARCNET cable cutting and cleaning of inside the ARCNET connector, see ☞68100.
J/P224
J/P223
ARCNET
ARCNET
J/P518
J/P517
J/P1517
J/P1516
J/P219
J/P220
J/P222
J/P221
Processor
control PCB
Printer control PCB
Laser control
PCB
Printer I/F main PCB
J/P1208
J/P1207
Disconnect two cables that are connecting Processor control PCB ⇔ Printer control PCB
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