IBM 4247-003 Maintenance Manual - Page 376
Follow the procedure to remove the EMI filter in EMI Filter Model A00 Early-Level Logic Board Only
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Replacement 1. Follow the removal steps in reverse order. Important If you replace an early-level logic board with a late-level logic board, the EMI filter MUST be removed from the operator panel cable. a. Follow the procedure to remove the EMI filter in "EMI Filter (Model A00 Early-Level Logic Board Only)" on page 377. b. Connect the operator panel cable directly to the late-level logic board. Note: Be certain the front edge of the logic board is inserted between the metal tabs on the frame. 2. Ensure the non-metal washer is installed as shown in Figure 116 on page 373. Note: When the non-metal washer is not installed, the frame ground is connected to the dc ground. The default is washer installed. 3. The NPS 540+ can be used without an external power supply only if +5 V dc is enabled (supplied) on pin 18 of the printer parallel attachment connector. NPS devices (p/n 30H4082, 30H4083, 30H4055) cannot be powered by pin 18 and always require an external +12 V ac power supply. There is no danger of damaging any NPS or other computer devices when +5 V dc is enabled on pin 18. The new logic board you will receive will have a 2 pin jumper installed on either a 2 pin or a 3 pin connector located near the parallel attachment connector. To attach the NPS Ethernet 540+ (p/n 30H4054) to the 4247 printer without an external power supply: a. Find the 2 pin jumper and connector. b. If a 2 pin jumper is installed on a 2 pin connector then + 5 V dc is enabled to pin 18. c. If a 2 pin jumper is installed on a 3 pin connector, as shown in Figure 4-18, use the chart below and verify the jumper is installed to enable +5 V dc on pin 18. If the jumper is not installed correctly, move it to the pins shown in the chart. Chapter 5. Removals and Adjustments 376
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