Confidential
9-61
F-2
Speed dialing and One-touch dialing can't be used.
Possible cause
Step
Check
Result
Remedy
Speed dialing,
One-touch dialing
1
A fax transmission can
be made using the key,
ten?
Yes
Replace the main PCB.
Dialing mode
setting
2
Dialing signal (PB or
DP) comes out normally
in each mode.
(Use telephone line
emulator.)
Yes
Check the dialing mode setting
at customer's again.
Check the telephone line cord
between machine and socket.
Connection
between main
PCB and NCU
PCB
3
Main PCB and NCU
PCB are properly
connected.
No Fix the connection properly.
Harness between
main PCB and
NCU PCB
4
Harness is damaged.
Yes
Replace the harness with a
normal part.
Connection
between main
PCB and control
panel PCB
5
Main PCB and control
panel PCB are properly
connected.
No Fix the connection properly.
Harness between
main PCB and
control panel PCB
6
Harness is damaged.
Yes
Replace the harness with a
normal part.
Rubber key
7
Replacement of rubber
key solves the problem.
Yes
Replace the rubber key with a
normal part.
NCU PCB
8
Replacement of NCU
PCB solves the problem.
Yes
Replace the NCU PCB with a
normal part.
Control panel PCB
9
Replacement of control
panel PCB solves the
problem.
Yes
Replace the control panel PCB
with a normal part.
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 ...