Lexmark T640DTN Service Manual - Page 147
Operator panel display, System board. See
UPC - 734646725224
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4061-xx0 Operator panel display Service tip: The printer has detected a problem with the system board, the operator panel cable (part of the upper front cover hinge assembly), or the operator panel board if POST does not complete, the printer emits 5 beeps, and stops in a continuous pattern until the printer is turned off. Note: If the operator panel is operating properly except for a pel or a few pels missing or broken, run the "Panel Test" on page 3-7 from the hardware tests before continuing with this service check. FRU 1 Operator panel cable 2 Operator panel display blank, 5 beeps, LED off 3 Operator panel display blank, 5 beeps, LED on 4 Operator panel all diamonds, no beeps 5 Operator panel all diamonds, 5 beeps Action Check for proper installation of the cable at the system board (J13) and at the operator panel. Check the continuity of the operator panel cable. If incorrect, replace the upper front cover hinge assembly. See "Upper front cover hinge assembly removal" on page 4-78. Check for correct installation of the operator panel cable at J13 on the system board. If incorrect, reinstall the cable properly. If correct, measure the voltage at J13-2 on the system board. The voltage should measure approximately +5 V dc. If incorrect, replace the system board. "System board and inner shield removal" on page 4-76. If correct, check continuity of the operator panel cable. If the continuity is incorrect, replace the upper front hinge assembly. If the continuity is correct, replace the operator panel board. See "Operator panel board removal" on page 4-66. Check for ground between J13-4 and ground. If correct, replace the operator panel board. See "Operator panel board removal" on page 4-66. If incorrect, check the operator panel cable. If the cable is incorrect, replace the upper front cover hinge assembly. See "Upper front cover hinge assembly removal" on page 4-78. If the correct, replace the system board. See "System board and inner shield removal" on page 4-76. Make sure a card is not plugged in backward. This condition causes the printer to fail POST, displaying all diamonds on the operator panel with no beeps. Check the voltage at Pin J13-1 and J13-3. The voltage measures approximately +3.3 V dc. If incorrect, replace the FRUs in the following order: • Operator panel board (see "Operator panel board removal" on page 4-66) or the Upper front cover (see "Upper front cover removal" on page 4-11). • System board. See "System board and inner shield removal" on page 4-76. • Upper front cover hinge assembly. See "Upper front cover hinge assembly removal" on page 4-78. Diagnostic information 2-107