HP 220 - Manual (Page 189)

9Ć11 Product History and Service Notes C3187Ć90000
New BailĆLiftĆMechanism Support
Date: 01 August 1994
Service Note: Draft
Supersedes: None
Products: HP DesignJet 200 C3180A & C3181A
Serial Numbers : C3180A ESA0000000/ESA4507951
C3181A ESA0000000/ESA4508541
To Be Performed By: HPĆQualified Personnel
Parts Required: C2858Ć60209 Bail Mechanism Assembly
Situation :
The bail features an automatic lift mechanism driven by the media motor using a series of
gears and actuated by the carriage. The lift mechanism is composed of the engagement lever,
cam gear, engagement gear, autoĆcam and teflon washers.
When it is necessary to lift the bail, the carriage positions itself over the engaging lever,
pressing it down (the lever is spring loaded). As the lever is pressed down, the gear cam and
the engaging gear are connected to the left drive roller gear. Once connected, the driver
roller rotates (via the MediaĆdrive motor), causing the cam to rotate. As the cam rotates, it
pushes against the left bail pivot, raising the bail.
The teflon washers are installed between the autoĆcam and the sideĆplate to act as shims
which reduce looseness between the different parts of the assembly. Typically the number of
Teflon Washers to install on a DesignJet 200 is two. However problems can occur if the bail
lift is too loose or too tight. In some cases, it may be necessary to install between 1 and 3,
thus complicating the repair procedure.
Solution
A new solution has been introduced in order to improve the serviceability of the bailĆlift
mechanism and which avoids the use of teflon washers. The looseness of the mechanism is
reduced by a new part, the camĆgear support. This part attaches to the YĆtensioner bracket
and fits into the center of the cam gear preventing the movement of this gear during the
engaging process.
A new liftĆmechanism kit has been created that includes all the necessary parts to implement
this new solution. The part number of the kit is C2858Ć60209. It is expected to be available
at the beginning of September 1994.