"50.2" indicates that the fuser failed to warm up. Replacing the fuser is usually all it takes to solve the problem. Now and then, though, the error persists. When a printer with a known-good fuser in it gives this error, the fault is with the Engine Controller PCA. Proceed as follows to gain access to the PCA and replace it.
1) Cartridge
2) Tray 2
3) Fuser End Caps
- Tug their lower edges out and up.
4) Back Door
- Open it and pry at the right side hinge to free the door.
5) Fuser
- Two captive screws.
6) Rear Right Side Cover
- Tug it rearward to remove it.
7) Control Panel Overlay
- Pry at its right side lip to free two small claws.
8) Control Panel
- Pry up its front edge and two claws will let go.
- One cable connection.
9) Top Cover
- Two M4x12mm bright pan head threading screws at the back.
- Two M4x12mm bright pan head threading screws under the toner cartridge access door.
- Cartridge engagement arm -- free its upper end.
- Pry at the right front to free the right front corner.
- Tug the front of the cover up forcefully to free it.
10) Front Right side Cover
- One claw at the top.
11) Left Side Cover
- One claw high up rear of centre.
12) Two Black Extended Head Screws near the Front
- The left side screw is visible by the violet cable for Tray 1's paper-out sensor.
- The right side screw is concealed under the envelope feeder's connector cover. Open the cover and you'll see the screw's head.
13) Formatter Cage
- Four M3x6mm bright washerhead screws. (Early machines had a fifth screw at the top.)
- Tug the cage rearward to disconnect it.
14) Formatter Cage Receiver (Sheet Metal)
- Four M4x10mm black pan head threading screws.
- Three M3x6mm bright pan head screws w/captive star washers.
15) Fourteen-Conductor Cable Connector
- Unplug it and free it from its hook.
16) One M4x10mm Black Pan Head Threading Screw
- It's at the left side, just below and behind the lower rear corner of the fan.
17) Engine Assembly
- It's free to be lifted off the paper tray(s) module. Mind the Tray 1 door as you lift the engine off and set it upside down on a work surface.
18) Engine Controller PCA
- Switch Rod -- free its rear end from the switch lever on the PCA.
- Three M3x6mm dark pan head screws w/captive star washers. (They're pointed out by arrows.)
- Four M4x10mm black pan head threading screws. (They're pointed out by arrows.)
- One drum ground connection -- it's a torsion spring end near the front of the fan.
- Two cable connections at the fan side of the PCA.
- Tip up the fan side of the PCA.
- Ten conventional cable connections.
- One ribbon cable connection.
With the PCA out of the engine, it's a good time to blow out the engine with compressed air.
Take great care with reconnecting, repositioning and refastening the replacement PCA. Note that there are four high voltage spring-contacts at the fan side near the front. Those must not get distorted.
1) Cartridge
2) Tray 2
3) Fuser End Caps
- Tug their lower edges out and up.
4) Back Door
- Open it and pry at the right side hinge to free the door.
5) Fuser
- Two captive screws.
6) Rear Right Side Cover
- Tug it rearward to remove it.
7) Control Panel Overlay
- Pry at its right side lip to free two small claws.
8) Control Panel
- Pry up its front edge and two claws will let go.
- One cable connection.
9) Top Cover
- Two M4x12mm bright pan head threading screws at the back.
- Two M4x12mm bright pan head threading screws under the toner cartridge access door.
- Cartridge engagement arm -- free its upper end.
- Pry at the right front to free the right front corner.
- Tug the front of the cover up forcefully to free it.
10) Front Right side Cover
- One claw at the top.
11) Left Side Cover
- One claw high up rear of centre.
12) Two Black Extended Head Screws near the Front
- The left side screw is visible by the violet cable for Tray 1's paper-out sensor.
- The right side screw is concealed under the envelope feeder's connector cover. Open the cover and you'll see the screw's head.
13) Formatter Cage
- Four M3x6mm bright washerhead screws. (Early machines had a fifth screw at the top.)
- Tug the cage rearward to disconnect it.
14) Formatter Cage Receiver (Sheet Metal)
- Four M4x10mm black pan head threading screws.
- Three M3x6mm bright pan head screws w/captive star washers.
15) Fourteen-Conductor Cable Connector
- Unplug it and free it from its hook.
16) One M4x10mm Black Pan Head Threading Screw
- It's at the left side, just below and behind the lower rear corner of the fan.
17) Engine Assembly
- It's free to be lifted off the paper tray(s) module. Mind the Tray 1 door as you lift the engine off and set it upside down on a work surface.
18) Engine Controller PCA
- Switch Rod -- free its rear end from the switch lever on the PCA.
- Three M3x6mm dark pan head screws w/captive star washers. (They're pointed out by arrows.)
- Four M4x10mm black pan head threading screws. (They're pointed out by arrows.)
- One drum ground connection -- it's a torsion spring end near the front of the fan.
- Two cable connections at the fan side of the PCA.
- Tip up the fan side of the PCA.
- Ten conventional cable connections.
- One ribbon cable connection.
- - -
With the PCA out of the engine, it's a good time to blow out the engine with compressed air.
Take great care with reconnecting, repositioning and refastening the replacement PCA. Note that there are four high voltage spring-contacts at the fan side near the front. Those must not get distorted.
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