Wednesday, October 26, 2011

OfficeJet G85 leaking black ink

If the leaking is on the right, the service station has overflowed. After disassembly I suggest using a garden hose set to a trickle to wash out the bottom of the printer. Avoid getting water on the carriage, electronics boards, and motors.

You will need T10 and T20 Torx drivers.

Turn on the power. Open the printer as if you are going to change a cartridge and then unplug the power.

Removing the rear cover.
Looking from the rear, remove the T20 Torx screw on the left. This will allow you to remove the LIU (Line Interface Unit) cover and unplug the LIU. There are two push latches underneath that release the rear panel. It will hinge upward.

Removing the rear panel will reveal some cables connected to the scanner. Disconnect them.

Removing the Scanner
Tilt the scanner upward as if you are going to access the cartridges. You will see two large springs. Remove them. The front of the scanner pivots on two large hinges. Pry them apart with a slot style screwdriver. They will resist but will release and allow the scanner to rotate upwards. Rotate the scanner approximately 90 degrees and it will lift off of it's rear hinges. Use caution as you remove it in case you do not have all of the cables previously mentioned disconnected.

Removing the rest of the case
There is a flat piece held on by four T10 Torx screws and two side covers that will hinge outward when two T10 Torx screws on each one are removed. When the side covers hinge outward they can be removed.

Removing the Service Station
1. Unplug the connector from the carriage drive motor.
2. Unplug the connector from the main electronics board.
3. Viewed from the front, remove the red screw from right side of the service station.
4. Remove the screw in the vertical frame to the right of the carriage drive motor.
5. Remove the screw in the vertical frame to the left of the belt tensioner.
6. Looking from the top, remove the two screws going through the carriage rod.
7. The vertical frame will now hinge up and come free of mechanism.
8 Looking from the front, there is a large latch on the right side of the service station. The wiring obscures it. Using a slot style screwdriver, release the latch and the service station will rotate CCW and lift out. Unplug the motor connector to free the service station from the mechanism.

Cleaning the Service Station.
1. Remove the service station motor by removing one screw.
2. Scrape as much congealed ink as possible from the service station.
3. Immerse the service station in hot water to dissolve the remaining ink. This will take a while but after a few rinsings nearly all of the ink will be removed.