Brother 1660E Service Manual page 106

Service Call Message
99 SERVICE 4
99 SERVICE 5
99 SERVICE 6
99 SERVICE 8
99 SERVICE 9
Meaning
Instruction bus error
Data bus error
Privileged instruction
Illegal instruction
No fpu
VI - 30
Action
remains, replace the main
PCB.
Turn off the printer. Wait a
few seconds, then turn it
on again. If still remains,
replace the main PCB.
Turn off the printer. Wait a
few seconds, then turn it
on again. If still remains,
replace the main PCB.
Turn off the printer. Wait a
few seconds, then turn it
on again. If still remains,
replace the main PCB.
Turn off the printer. Wait a
few seconds, then turn it
on again. If still remains,
replace the main PCB.
Turn off the printer. Wait a
few seconds, then turn it
on again. If still remains,
replace the main PCB.