User manual HP COLOR LASERJET 2550 PRINTER SERVICE MANUAL

[. . . ] hp color LaserJet 2550 printer service hp color LaserJet 2550 series printer Service Manual Copyright information © 2004 Copyright Hewlett-Packard Development Company, L. P. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. [. . . ] Remove the toner-catch tray (see Toner-catch tray). Remove two screws (callout 1) from the transfer-roller plate. Lift the transfer-roller plate straight up to remove it from the printer. 1 Figure 5-51. Removing the transfer-roller plate Transfer roller CAUTION Do not touch the black sponge portion of the transfer roller. Remove the following assemblies: Toner-catch tray (see Toner-catch tray) Transfer-roller plate (see Transfer-roller plate) 2. Use needle-nose pliers to gently squeeze the small tabs at the right side of the transfer roller (see the detail in Figure 5-52. Removing the transfer roller) and then also squeeze the tabs at the left side of the transfer roller to release the roller. Note Be careful not to bend the thin metal strip adjacent to the tabs on the right side of the roller. 152 Chapter 5 Removal and replacement ENWW 3. Lift the transfer roller up from the right side, slide it to the right, and lift it out of the printer. Note The small grounding spring that is underneath the left side of the transfer roller is attached to the transfer roller. The small grounding spring that is underneath the right side of the transfer roller remains in the chassis. Figure 5-52. Removing the transfer roller Feed-drive shaft 1. Remove the following covers and assemblies: Right- and left-side covers (see Right- and left-side covers) Toner-catch tray (see Toner-catch tray) Transfer-roller plate (see Transfer-roller plate) Transfer roller (see Transfer roller) 2. Remove one screw (callout 1) from the gear cover, and then lift the gear cover to remove it. Lift the belt roller (callout 2) from its hooks. Use a small flatblade screwdriver to slide the clip toward the back of the printer, and then pry the feed-drive shaft (callout 3) off of the hooks that secure it to the printer. Note Unless the feed-drive shaft itself is damaged, there is no need to remove the shaft. Use a small flatblade screwdriver to pry four pulleys (callout 4) from their hooks. ENWW Removal and replacement 153 6. After the feed-drive shaft and the pulleys are released, remove the timing belt (callout 5) and the small feed belts by sliding them off of the right end of the feed-drive shaft. Note Callout 6 shows the roller on the fuser wrap-jam sensor. The roller must be removed first if you want to remove the ECU pan (the bottom plate of the printer). 1 6 2 5 3 4 Figure 5-53. Removing the feed-drive shaft Reinstallation tip Examine the timing belt (callout 5) before removing it from the printer. The leading and trailing sides of the ridges are different and the belt must be reinstalled correctly to prevent media-feed problems. ECU pan 1. Remove the following covers and assemblies: Right- and left-side covers (see Right- and left-side covers) Interface cover (see Interface cover) Formatter cage (see Formatter assemblies) Optional tray 2 (see Optional tray 2 (250-sheet tray)) Toner-catch tray (see Toner-catch tray) 2. [. . . ] Power-supply base assembly Ref 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 15 16 17 Description Holder, fuser connector Insulating sheet Support, high-voltage PCA Cable, high-voltage transformer Clip, cable Screw, M3x8 Cable, sub-high-voltage transformer Cable, fuser connector, dc controller Cable, fuser, power Cable, formatter, power Cable, power (1) Cable, power (2) Holder, high-voltage Screw, M3x8 Low-voltage PCA, 110-127 V Low-voltage PCA, 220-240 V High-voltage transformer PCA Sub-high-voltage transformer PCA Part number RB3-0006-000CN RB3-0007-000CN VT2-0012-005CN RG5-7146-000CN WT2-5737-000CN XA9-1355-000CN RG5-7126-000CN RG5-7109-000CN RG5-6971-000CN RG5-7106-000CN RG5-7621-000CN RG5-7108-000CN RB3-0062-000CN XA9-1291-000CN RH3-2254-000CN RH3-2255-000CN RG5-7606-000CN RG5-7124-000CN Qty 1 1 6 1 2 9 1 1 1 1 1 1 1 4 1 1 1 1 ENWW Internal assemblies 265 1 (DCM703) (J105) 3 (SL93) (J104) (J705) (PM705) 2 Figure 7-10. Rotary-drive assembly 266 Chapter 7 Parts and diagrams ENWW Table 7-12. Rotary-drive assembly Ref Description Rotary drive assembly 1 2 3 Motor (DCM703) Motor (PM705) Solenoid (SL93) Part number RG5-7592-000CN RG5-7593-000CN RH7-1535-000CN RH7-5340-000CN Qty 1 1 1 1 ENWW Internal assemblies 267 PCA assemblies 7 1 2 5 8 3 4 6 9 Figure 7-11. PCA assemblies 268 Chapter 7 Parts and diagrams ENWW Table 7-13. PCA assemblies Ref 1 2 3 3 4 5 6 7 8 9 Description Top-of-page sensor PCA Dc controller Low-voltage PCA, 110-127 V Low-voltage PCA, 220-240 V High-voltage transformer PCA Waste-toner sensor PCA Registration-sensor PCA Density-sensor PCA Toner-sensor PCA Sub-high-voltage transformer PCA Formatter, HP color LaserJet 2550L printer Formatter (includes network card), HP color LaserJet 2550Ln printer and HP color LaserJet 2550n printer Part number RG5-6966-000CN RG5-7605-000CN RH3-2254-000CN RH3-2255-000CN RG5-7606-000CN RG5-7607-000CN RG5-6967-000CN RH7-7146-000CN RG5-6964-000CN RG5-7124-000CN Q3702-67901 Q3703-67901 Qty 1 1 1 1 1 1 1 1 1 1 ENWW PCA assemblies 269 Alphabetical parts list Table 7-14. Alphabetical parts list Description Air duct Bushing Bushing Bushing Bushing, gear assembly Bushing, left Bushing, right Cable Cable guide Cable, flat, flexible, laser/scanner Cable, formatter, power Cable, front Cable, fuser connector, dc controller Cable, fuser motor Cable, fuser, power Cable, grounding Cable, high-voltage transformer Cable, high-voltage transformer Cable, interface Cable, motor Cable, power (1) Cable, power (2) Cable, rotary assembly Cable, sensor Cable, sub-high-voltage transformer Part number RB9-0901-000CN RS5-1638-000CN RS5-1637-000CN RB3-1094-000CN RS5-1635-000CN RB2-3043-000CN RB2-3044-000CN RG5-7128-000CN RB2-9903-000CN RH2-5524-000CN RG5-7106-000CN RG5-7145-000CN RG5-7109-000CN RG5-7620-000CN RG5-6971-000CN RG5-7123-000CN RG5-7130-000CN RG5-7146-000CN RG5-7122-000CN RG5-7114-000CN RG5-7621-000CN RG5-7108-000CN RG5-7129-000CN RG5-7117-000CN RG5-7126-000CN Table and page Table 7-5 on page 251 Table 7-4 on page 248 Table 7-9 on page 259 Table 7-9 on page 260 Table 7-4 on page 248 Table 7-4 on page 247 Table 7-4 on page 247 Table 7-9 on page 260 Table 7-6 on page 253 Table 7-6 on page 253 Table 7-11 on page 265 Table 7-5 on page 251 Table 7-11 on page 265 Table 7-5 on page 251 Table 7-11 on page 265 Table 7-9 on page 259 Table 7-9 on page 260 Table 7-11 on page 265 Table 7-9 on page 259 Table 7-6 on page 253 Table 7-11 on page 265 Table 7-11 on page 265 Table 7-10 on page 263 Table 7-6 on page 253 Table 7-11 on page 265 270 Chapter 7 Parts and diagrams ENWW Table 7-14. 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