HP LaserJet 4550 HDN Service Manual
Download Service manual of HP 4550hdn - Color LaserJet Laser Printer Printer, Printer Accessories for Free or View it Online on All-Guides.com.
Brand: HP
Category: Printer , Printer Accessories
Type: Service manual for HP 4550hdn - Color LaserJet Laser Printer
Pages: 5
Download HP 4550hdn - Color LaserJet Laser Printer Service manual
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The following are updates to the latest version of the CLJ4500/4550 combined
service manual, part number C7085-90921.
Page 14 - The HP LaserJet 4550HDN printer is the base model with a 5 GB hard
drive, an HP JetDirect 610 print server (network card), a 500-sheet paper
feeder, a duplex unit, and 64 MB of RAM.
Page 18 - Figure 1-3 shows a Serial No. that begins with US. Serial numbers for all
4500/4550 printers models begin with JP. Also, the label has Made in Singapore
listed and the 4500/4550 labels will read "Made in Japan".
Page 120 - Add details on toner level sensing:
How does it work?
The Toner Level Sensor Assembly is mounted to the carousel drive assembly on
the right side of the printer chassis. This PCA provides for continuous toner level
sensing. To obtain the toner level, the printer measures capacitance of the
toner through the developer sleeve, onto the copper plate in the carousel.
Each time the carousel turns, the toner level sensing PCA takes a reading from
the cartridge. The Toner Level Sensing PCA then reports these signals to the
formatter.
How are the readings reported on the Supplies Status Page?
The TLS levels reported on the Supplies Status Page (SSP) are an average of the
raw information that is reported to the formatter. At power-on, the toner level
value listed on the Supplies Status Page is the highest level reported to the
formatter through the first 8 readings taken. After 8 readings have been taken,
a running average of the last 8 readings is reported on the SSP. The running
average continues until the printer is power-cycled, or the top cover is
Color
LaserJet
4500/4550
Service Manual Update
Document Summary
Updates include information that is incorrect or missing in the service
manual.
Author: Deborah Hahn, ICO Technical Marketing
Dt
M h 19 2003