Confidential
9-59
L-2
The control panel does not work.
User Check
(1) No
Possible cause
Step
Check
Result
Remedy
Key sticking
1
Any key on control
panel is stuck.
Yes
Clean up the panel cover, or
remove the burrs from panel
cover and panel keys.
Connection
between main
PCB and control
panel PCB
2
Main PCB and
control panel PCB
are properly
connected.
No
Fix the connection properly.
Harness between
main PCB and
control panel
PCB
3
Harness is damaged.
Yes
Replace the harness with a normal
part.
Rubber key
4
Replacement of
rubber key solves the
problem
Yes
Replace the rubber key with a
normal part.
Control panel
PCB
5 Replacement
of
control panel PCB
solves the problem.
Yes
Replace the control panel PCB
with a normal part.
Main PCB
6
Replacement of main
PCB solves the
problem.
Yes
Replace the main PCB with a
normal part.
L-3
Printing from Macintosh applications fails.
User Check
(1) Verify that the printer driver supplied with the machine has been installed in the system
folder and selected in the selector.
(2) Check the port selected in the selector. The selected port has to match the actual port to
which the printer cable is connected.
Possible cause
Step
Check
Result
Remedy
Fault in machine
1
Test page can be
printed using the
method described in
8.1.4.5 ‘Test Pattern
1’ in Chapter 8.
No
Check the symptom of the
problem and refer to an
appropriate section in this
Chapter to solve the problem.
Breakage of main
PCB
2
Printing can be made
using an appropriate
PC, printer cable,
and RS-100M?
No
Replace the main PCB.
Summary of Contents for MFC-9420CN
Page 1: ...Confidential FACSIMILE EQUIPMENT SERVICE MANUAL MODELS MFC 9420CN ...
Page 16: ...Confidential CHAPTER 1 PARTS NAMES FUNCTIONS ...
Page 22: ...Confidential CHAPTER 2 SPECIFICATIONS ...
Page 33: ...Confidential CHAPTER 3 THEORY OF OPERATION ...
Page 48: ...Confidential 3 1 4 CBV DBV Fig 3 16 Y M C K Fig 3 17 ...
Page 69: ...Confidential 3 3 5 Fig 3 35 ...
Page 73: ...Confidential 3 3 9 3 Interface Circuit Printer side Fig 3 38 ...
Page 82: ...Confidential CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR ...
Page 85: ...Confidential 4 2 Cover page sample End page sample Fig 4 1 ...
Page 86: ...Confidential CHAPTER 5 DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 94: ...Confidential 5 5 5 1 1 AC Cord 1 Disconnect AC cord from the machine Fig 5 1 AC cord Machine ...
Page 175: ...Confidential CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS REQUIRED AFTER PARTS REPLACEMENT ...
Page 203: ...Confidential CHAPTER 7 CLEANING ...
Page 205: ...Confidential CHAPTER 8 MAINTENANCE MODE ...
Page 213: ...8 6 Confidential Fig 8 2 Scanning Compensation Data List a b c d e f g h i j k l m n q ...
Page 224: ...8 17 Confidential Cover page sample End page sample Fig 8 8 ...
Page 255: ...Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING ...
Page 279: ...Confidential 9 23 2 Image failure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ...
Page 280: ...Confidential 9 24 15 a 15 b 16 17 18 19 20 21 22 23 24 25 Fig 9 1 ...
Page 325: ...App 1 5 Confidential 6 Transfer Unit X X X X X X 7 1 2 3 Location SERIAL NO YEAR MONTH DATE ...
Page 398: ...B Power Supply PCB 100V 127V Confidential ...