
Chapter 2
2-38
F-2-41
PG position H sensor
The photo inerrupter-based pg position H sensor detects the status of the lift assebmly in the purge unit.
The sensor determines that the lift assebmly is lifted when the rotary flag, which operates in conjunction with the lift cam, cuts off the sensor light.
Head management sensor
The photo transmission sensor detects whether the printhead is discharging ink.
When the carriage arrives at the location for detection, it stops and the ink is discharged from one nozzle of the nozzle array at a time until all the nozzles
are checked for their normal ink discharging operations. This process is repeated for the rest of the 5 nozzle arrays of the printhead.
If the sensor light is blocked by the ink discharged from a nozzle and the voltage measured by the sensor changes, that nozzle is proved to work correctly.
F-2-42
- Close
Rotary flag
Ink supply valve
(all colors)
Ink supply valve (Bk)
Sensor
- Ink supply valve
(all colors) open
- Ink supply valve
(Bk) open
Printhead
Nozzle unit
Head management
sensor unit
Summary of Contents for W8400 Series
Page 1: ...Apr 5 2005 Service Manual W8400 Series W8400 ...
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Page 12: ...Contents ...
Page 13: ...Chapter 1 PRODUCT DESCRIPTION ...
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Page 21: ...Chapter 1 1 5 F 1 9 ...
Page 47: ...Chapter 2 TECHNICAL REFERENCE ...
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Page 91: ...Chapter 3 INSTALLATION ...
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Page 97: ...Chapter 4 DISASSEMBLY REASSEMBLY ...
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Page 147: ...Chapter 6 TROUBLESHOOTING ...
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Page 193: ...Chapter 6 6 43 F 6 8 Cover switch tool Cover switch tool ...
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Page 195: ...Chapter 7 SERVICE MODE ...
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Page 213: ...Chapter 8 ERROR CODE ...
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