Xerox 4400DT Service Manual - Page 87
Engine Logic Board NVRAM Failure., U6 NVM Fail/Power Off
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Fan Failure Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 4 1. Enter Service Diagnostics and select Motors/Fans Go to step 7. Go to step 5. Tests. 2. Scroll to Fan Motor High Speed and press OK. Does the Fan rotate at high speed? 5 1. Switch the printer power OFF. Replace the Go to step 6. 2. Remove the Left Interface Cover (RRP 1.1, Fan page 6-6), Left Cover (RRP 1.2, page 6-7), and Left Plate (RRP 1.11, page 6-16). 3. Enter Service Diagnostics and select Motors/Fans Tests and press OK. Assembly (RRP 9.1 on page 6-87). 4. Scroll to Fan Motor High Speed and press OK. 5. On the LVPS, check the voltage between P/J283 pin 1 and frame ground. Is the voltage +21.5 ±2.1 VDC? 6 1. On the LVPS, check the voltage between P/J281 pin Replace the Replace the 11 and frame ground. 2. With the Fan Motor High Speed test still highlighted, press OK. LVPS (RRP 9.5 on page 6-91). Engine Logic Board (RRP 9.3 on Does the voltage change from 0.8 VDC to 0.0 page 6-89). VDC when you press OK? 7 1. Switch the printer power OFF. Replace the Replace the 2. Remove the Left Interface Cover (RRP 1.1, Engine Logic Fan page 6-6), Left Cover (RRP 1.2, page 6-7), and Left Plate (RRP 1.11, page 6-16). 3. On the LVPS, check the voltage between P/J283 pin 2 and frame ground. Board (RRP 9.3 on page 6-89). Assembly (RRP 9.1 on page 6-87). Is the voltage less than 1.0 VDC? Engine Logic Board NVRAM Failure. (U6 NVM Fail/Power Off) There is problem with Non-Volatile RAM on the Engine Logic Board. NVM Failure Troubleshooting Procedure Step Actions and Questions Yes No 1 Switch the printer power OFF then ON. Does the error message reappear? Replace the Engine Logic Board (RRP 9.3 on page 6-89). Go to step 2. 2 To ensure that the problem is solved, switch the printer Replace the Problem power OFF and ON several times. Engine Logic solved. Does the error message reappear? Board (RRP 9.3 on page 6-89). 2-50 Phaser 4400 Laser Printer Service Manual