3-27
Confidential
Switching arm assembly inside maintenance unit
When the paper feed motor is driving the maintenance unit, counterclockwise (when viewed from the
output gear side) rotation drives the purge cam; clockwise rotation, the tube pump.
Purge bevel gear
Tube pump
Switching arm assembly
Opening tube to the atmospheric air
Color drain tube
Black drain tube
Purge HP switch
Pump switching unit
Purge cam
Air vent tube
Main drain tube
Purge cam mechanism
The purge cam is so designed that:
- the carriage lock pops out to lock the head/carriage unit before purging and pops in before
cleaning with the head wiper (this lock also secures the head/carriage unit during transportation),
- the pump switching unit switches application of the negative pressure from the pump between the
black head nozzles, the color head nozzles, and the air vent rod unit. When the purge cam is in the
head capping position, the pump switching unit opens their interiors to normal atmospheric
pressure.
- the head wiper comes out to clean the nozzle surface, and
- the air vent rods are pushed up via the slide cams to expel air trapped.
The purge cam switch detects the cam drive positions. (See
Summary of Contents for FAX 1840C
Page 1: ...Confidential FACSIMILE EQUIPMENT SERVICE MANUAL MODELS MFC3340CN 3240C FAX1940CN 1840C 1835C ...
Page 9: ...Confidential CHAPTER 1 PARTS NAMES FUNCTIONS ...
Page 18: ...Confidential CHAPTER 2 SPECIFICATIONS ...
Page 50: ...Confidential CHAPTER 3 THEORY OF OPERATION ...
Page 91: ...Confidential CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR ...
Page 96: ...Confidential CHAPTER 5 DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 167: ...5 69 Confidential Viewed from the left ...
Page 171: ...Confidential CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS REQUIRED AFTER PARTS REPLACEMENT ...
Page 191: ...6 18 Confidential Vertical Alignment Check Patterns ...
Page 193: ...6 20 Confidential Margin Check Pattern ...
Page 202: ...Confidential CHAPTER 7 CLEANING ...
Page 205: ...Confidential CHAPTER 8 MAINTENANCE MODE ...
Page 216: ...8 9 Confidential Scanning Compensation Data List a b c d e f i ...
Page 236: ...8 29 Confidential 1st sheet 2nd sheet Vertical Alignment Check Patterns ...
Page 239: ...8 32 Confidential Margin Check Pattern ...
Page 249: ...Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING ...
Page 253: ...9 2 Confidential ...
Page 254: ...9 3 Confidential ...
Page 371: ...B Power Supply PCB U S A and Canadian models Confidential ...
Page 372: ...B Power Supply PCB European and Asian models Confidential ...
Page 401: ...Confidential February 05 SM FAX032 8XA901 5 Printed in Japan ...