Brother HL 5030 - B/W Laser Printer Service Manual page 203

M-12 Engine PCB error
Possible cause Step
Fixing unit 1
ground wire
connection
Harness 2
connection
failure
Engine PCB 3
Main PCB 4
M-14 DIMM failure
Possible cause Step
DIMM failure 1
Check
Is the ground wire on the fixing
unit secured with the shoulder
screw correctly?
Is the connection between
connector CN8(HL-
5030/5040/5050), CN9(HL-
5070N) on the main PCB and
connector CN10 on the engine
PCB secure?
Is the problem solved by
replacing the engine PCB?
Is the problem solved by
replacing the main PCB?
Check
Try installing DIMM into
another printer, then check the
memory size in Print Settings.
Is it possible to print the data?
6-23
HL-5030/5040/5050/5070N SERVICE MANUAL
Result Remedy
No Secure the ground wire
correctly with the shoulder
screw.
No Reconnect the connectors
securely.
Yes Replace the engine PCB.
Yes Replace the main PCB.
Result Remedy
Yes Replace the main PCB.
No Replace the DIMM.