• Code: 341.368
• Description: MCU-SW Firmware Mismatch. The MCU software for the Phaser 7800 model is installed in the 7525/30/35 model. Or, the MCU software for the 7525/30/35 model is installed in the Phaser 7800 model.
• Remedy: 1. Turn the power Off and On. 2. Install the correct version of the IOT firmware. 3. Initialize the IOT NVM (includes writing back the adjustment NVM). If the problem persists, replace the MCU PWB.

• Code: 341.369
• Description: MD Type Mismatch. The MD PWD for the Phaser 7800 model is installed in the 7525/30/35 model. Or, the MD PWD for the 7525/30/35 model is installed in the Phaser 7800 mode
• Remedy: 1. Turn the power Off and replace with the correct MD PWB.

• Code: 342.320
• Description: Drum Y, M, C Motor Fail. The Drum Drive Motor (Y, M, C) revolution failure was detected.
• Remedy: Turn the power Off and open the Front Cover. Remove the Drum (Y, M, C) and close the Front Cover. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [091-027] (Drum Drive Motor Y, M, C). Does the Drum Drive Motor (Y, M, C) rotate? Y↓ N→Turn the power Off and remove the Rear Upper Cover. Turn the power ON. Is the voltage between the MD PWB P/J526-3 (+) and the GND (-) +24VDC? Y↓ N→Go to +24VDC Power RAP. Is the voltage between the MD PWB P/J527-A16 (+) and the GND (-) +5VDC? Y↓ N→Go to +5VDC Power RAP. Turn the power Off and check the connections between the MD PWB P/J526 and the Drum Drive Motor (Y, M, C) P/J246, as well as between the MD PWB P/J527 and the Drum Drive Motor (Y, M, C) P/J247 for open circuits, short circuits, and poor contacts. If no problems are found, replace the following parts in sequence: • Drum Drive Motor (Y, M, C) • MD PWB • MCU PWB Press the Stop button and open the Front Cover. Install the Drum (Y, M, C) and close the Front Cover. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [091-027] (Drum Drive Motor Y, M, C). Does the Drum Drive Motor (Y, M, C) rotate? Y↓ N→Check the Drum (Y, M, C) for loading. Press the Stop button and turn the power Off. Check the connection between the Drum Drive Motor (Y, M, C) P/J247-8 and the MD PWB P/J527-A9 for open circuit, short circuit, and poor contact. If no problems are found, replace the following parts in sequence: • MD PWB • MCU PWB

• Code: 342.323
• Description: Drum K Motor Fail. The Drum/Developer Drive Motor (K) revolution failure was detected.
• Remedy: Turn the power Off and remove the Front Cover. Remove the Drum (K) and the Developer (K) and cheat the Front Cover Interlock Switch. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [091-033] (Drum/Developer Drive Motor K). Does the Drum/Developer Drive Motor (K) rotate? Y↓ N→Turn the power Off and remove the Rear Upper Cover. Turn the power ON. Is the voltage between the MD PWB P/J526-1 (+) and the GND (-) +24VDC? Y↓ N→Go to +24VDC Power RAP. Is the voltage between the MD PWB P/J527-A8 (+) and the GND (-) +5VDC? Y↓ N→Go to +5VDC Power RAP. Turn the power Off and check the connections between the MD PWB P/J526 and the Drum/Developer Drive Motor (K) P/J240, as well as between the MD PWB P/J527 and the Drum/Developer Drive Motor (K) P/J241 for open circuits, short circuits, and poor contacts. If no problems are found, replace the following parts in sequence: • Drum/Developer Drive Motor (K) • MD PWB • MCU PWB Press the Stop button and turn the power Off. Install the Drum (K), the Developer (K), and the Front Cover. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [091-033] (Drum/Developer Drive Motor K). Does the Drum/Developer Drive Motor (K) rotate? Y↓ N→Check the Drum (K) and the Developer (K) for loading Press the Stop button and turn the power Off. Check the connection between the Drum/Developer Drive Motor (K) P/J241-8 and the MD PWB P/J527-A1 for open circuit, short circuit, and poor contact. If no problems are found, replace the following parts in sequence: • MD PWB • MCU PWB

• Code: 342.324
• Description: IBT Motor Fail. The IBT Drive Motor revolution failure was detected.
• Remedy: Turn the power Off. Remove the IBT Unit and cheat the L/H Cover Interlock Switch. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [094-006] (IBT Drive Motor). Does the IBT Drive Motor rotate? Y↓ N→Turn the power Off and remove the Rear Upper Cover. Turn the power On. Is the voltage between the MD PWB P/J526-5 (+) and the GND (-) +24VDC? Y↓ N→Go to +24VDC Power RAP. Is the voltage between the MD PWB P/J527-B8 (+) and the GND (-) +5VDC? Y↓ N→Go to +5VDC Power RAP. Turn the power Off and check the connections between the MD PWB P/J526 and the IBT Drive Motor P/J248, as well as between the MD PWB P/J527 and the IBT Drive Motor P/ J249 for open circuits, short circuits, and poor contacts. If no problems are found, replace the following parts in sequence: • IBT Drive Motor • MD PWB • MCU PWB Press the Stop button and turn the power Off. Install the IBT Unit and close the L/H Cover. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [094-006] (IBT Drive Motor). Does the IBT Drive Motor rotate? Y↓ N→Check the IBT Drive for loading. Also, check the IBT for loading due to blockage in the IBT Waste Toner Collection Auger Press the Stop button and turn the power Off. Check the connection between the IBT Drive Motor P/J249-8 and the MD PWB P/J527-B1 for open circuit, short circuit, and poor contact. If no problems are found, replace the MD PWB.

• Code: 342.325
• Description: Main Motor Fail.
• Remedy: Turn the power Off. Remove the IBT Unit and cheat the L/H Cover Interlock Switch. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [042-002] (Main Drive Motor). Does the Main Drive Motor rotate? Y↓ N→Turn the power Off and remove the Rear Upper Cover. Turn the power On. Is the voltage between the MD PWB P/J535-1 (+) and the GND (-) +24VDC? Y↓ N→Go to +24VDC Power RAP. Is the voltage between the MD PWB P/J525-A16 (+) and the GND (-) +5VDC? Y↓ N→Go to +5VDC Power RAP. Turn the power Off and check the connections between the MD PWB P/J535 and the Main Drive Motor P/J244, as well as between the MD PWB P/J525 and the Main Drive Motor P/J245 for open circuits, short circuits, and poor contacts. If no problems are found, replace the following parts in sequence: • Main Drive Motor • MD PWB • MCU PWB Press the Stop button and turn the power Off. Install the IBT Unit and close the L/H Cover. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [042-002] (Main Drive Motor). Does the Main Drive Motor rotate? Y↓ N→Check the 2nd BTR for loading and the Drive Gear for revolution failure or damage Press the Stop button. Turn On dc330 Component Control [042-002] (Main Drive Motor), then turn On dc330 Component Control [077-001] (Takeaway Clutch). Turn On DC330 [042-002] (Main Drive Motor), then turn On DC330 [077-050] (Takeaway Motor). Does the Main Drive Motor rotate? Y↓ N→Press the Stop button. Turn On dc330 Component Control [042-002] (Main Drive Motor), then turn On DC330 [077-002] (Registration Clutch). Does the Main Drive Motor rotate? Y↓ N→Check the Registration Roll for loading and the Drive Gear for revolution failure or damage Press the Stop button and turn the power Off. Check the connection between the Main Drive Motor P/J245-8 and the MD PWB P/J525-A9 for open circuit, short circuit, and poor contact. If no problems are found, replace the following parts in sequence: • MD PWB • MCU PWBCheck the Tray 1 Takeaway Roll and the Tray 1 Takeaway Roll for loading and the Drive Gear for revolution failure or damage

• Code: 342.330
• Description: IH Exhaust Fan Fail. The IH Exhaust Fan error was detected.
• Remedy: Enter dc122 Fault History. Has 341.326/ 341.331 faults (MCU PWB F3 Open) occurred? Y↓ N→Turn the power Off and remove the Rear Upper Cover. Disconnect the connector P592 of the MD PWB and open the Chassis Assembly. Rotate the IH Exhaust Fan manually to check for loading. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [042-025] (NOHAD FAN Failure Detection). Is the IH Exhaust Fan rotating and does the test return an IH Exhaust Fan error? Y↓ N→When the Diag is turned On, is the voltage between the MCU PWB P/J414-B1 (+) and the GND (-) +24VDC? Y↓ N→Turn the power Off and replace the MCU PWB. Turn the power Off and check the connection between the IH Exhaust Fan P/J225 and the MCU PWB P/J414 for open circuit, short circuit, and poor contact. If no problems are found, replace the following parts in sequence: • IH Exhaust Fan • MCU PWB Replace the IH Exhaust Fan. Press the Stop button and turn the power Off. Check the connection between the IH Exhaust Fan P/J225-3 and the MCU PWB P/J414-B3 for open circuit, short circuit, and poor contact. If no problems are found, replace the MCU PWB. Go to the 341.326/ 341.331 RAP.

• Code: 342.332
• Description: IH Intake Fan Fail. The IH Intake Fan error was detected.
• Remedy: Enter dc122 Fault History. Has 341.350 faults (MD PWB F7 Open) occurred? Y↓ N→Turn the power Off and remove the Rear Upper Cover. Disconnect the connector P592 of the MD PWB and open the Chassis Assembly. Rotate the IH Intake Fan manually to check for loading. Turn the power On and enter Service Diagnostics (Entering Service Diagnostics). Turn On dc330 Component Control [042-025] (NOHAD FAN Failure Detection). Is the IH Intake Fan rotating and does the test return a IH Intake Fan error? Y↓ N→When the Diag is turned On, is the voltage between the MD PWB P/J529-B9 (+) and the GND (-) +24VDC? Y↓ N→Turn the power Off and replace the MD PWB. Turn the power Off and check the connection between the IH Intake Fan P/J226 and the MD PWB P/J529 for open circuit, short circuit, and poor contact. If no problems are found, replace the following parts in sequence: • IH Intake Fan (PL 4.1) • MD PWB • MCU PWB Replace the IH Intake Fan. Press the Stop button and turn the power Off. Check the connection between the IH Intake Fan J226-2 and the MD PWB P/J529-B11 for open circuit, short circuit, and poor contact. If no problems are found, replace the MD PWB. Go to the 341.350 RAP.