HP LaserJet 2100 
Tray 3 Internal Parts Diagram

15 Tooth Drive Gear - RS6-0501 Tray 3 Feed Roller - RB2-3490 Right Side Roller Bushing - RB2-3487 Left Side Roller Bushing - RB2-3486 Bushing Spring - RS6-2064 Frame Ground Cable - RG5-4281 Relay Cable - RG5-4280 Feed Drive Assembly Connector - VS1-6174 Sensor Cable - RG5-4278 Tray 3 Controller Board - RG5-4277 Tray 3 Paper Sensor PC Board- WG8-5382 Paper Sensor Lever - RB2-3474 Shaft Bushing/Retainer - RB2-2896 Shaft/Bushing Retainer - RB2-2895 Guide Roller - RB2-2892 Guide Roller - RB2-2892 Pickup Roller Assembly - RB2-2891
REF PART # DESCRIPTION
1 RB2-2891 Pickup roller assembly - Black and white 'D' shaped pickup roller with a slot in the end of the shaft - Tray 2 and 3 - Located near middle-front of tray
2 RB2-2892 Guide roller (Free spinning white plastic roller) - Mounts on the paper pickup drive shaft on each side of the pickup 'D' shaped roller - Two used
3 RB2-2895 Shaft bushing/retainer - Right side pickup roller support bushing - Pickup roller right side support bushing
4 RB2-2896 Shaft bushing/retainer - Left side pickup roller support bushing - Pickup roller left side support bushing
5 RB2-3474 Paper sensor lever - Mechanical link to Photo sensor PS2001
6 WG8-5382 Sensor PC board - Small board with flag activated photo sensor - Photo sensor (PS2001) - Tray 3 paper sensor
7 RG5-4277 Tray 3 controller board - Paper feed drive PCA
8 RG5-4278 Sensor cable - From photo sensor PS2001 to tray 3 paper feeder drive PC board - J2110 to J2003
9 VS1-6174 Feed drive assembly connector - Electrical connection between tray 3 and printer
10 RG5-4280 Relay cable - One connector to two connectors - Six wires - From feed drive controller board to feed drive relay
11 RG5-4281 Frame ground cable - Ground connection to feed drive housing - Round crimp lug to push-on connector with green wire
12 RS6-2064 Bushing spring - Provides tension for right side feed roller support bushing - For tray 3
13 RB2-3486 Roller bushing - Tray 3 left side feed roller bushing
14 RB2-3487 Roller bushing - Right side feed roller bushing - Roller bushing - Tray 3 right side feed roller bushing
15 RB2-3490 Feed roller - Tray 3 feed roller
16 RS6-0501 Drive gear - 15 tooth - 15 tooth drive gear - Drives Tray 3 feed roller
For more information about the parts listed above go to www.PrinterSupplies.com