Emerson 4000 Figure 9-7.Fuse Location, e.Terminal Block Replacement, f.Fuse Replacement (Figure 9-7), d.Electronic Assembly Replacement (Figure 9-5)

Oxymitter 4000

d.Electronic Assembly Replacement (Figure 9-5)

1.Remove the right housing cover un- covering the electronic assembly.

2.Depress and remove the J1 (cell and T/C) connector from the J1 socket. Loosen the three captive mounting screws on the microprocessor board (top board).

3.The J8 connector (heater leads) can be accessed by moving the J1 connector leads out of the slot on the microproc- essor board and sliding the electronic assembly partially out of the housing (Figure 9-6).

4.Squeeze the J8 connector on the sides and carefully remove. The electronic assembly can now be completely re- moved from the housing.

5.Reconnect the J8 connector to the power supply board. Make sure the connector is secure.

6.Holding the J1 connector leads, slide the electronic assembly the rest of the way into the housing. Align the elec- tronic assembly so that it fits flush on the pins. To ensure that it is flush, gently try to rotate the electronics. If the electronics rotates, repeat the alignment.

7.Reconnect the J1 connector to the mi- croprocessor board. Ensure the con- nector is secure and tighten the three captive screws on the microprocessor board (top board).

8.Replace the housing cover and ensure it is tight.

e.Terminal Block Replacement

1.Unscrew left housing cover (27, Figure 9-3.

2.Loosen the mounting screws (26) on the terminal block (25) and carefully lift the block out of the housing.

3.Carefully align the new terminal block on the pins so that it sits flat in the

Instruction Manual

IB-106-340 Rev. 3.0

December 2003

housing. The round end of the terminal block should be on the opposite side of the housing conduit ports and should not be able to rotate.

4.Tighten the three mounting screws and ensure the terminal block is secure in the housing.

f.Fuse Replacement (Figure 9-7)

1.Remove the right housing cover un- covering the electronic assembly.

2.Depress and remove the J1 (cell and T/C) connector from the J1 socket. Loosen the three captive mounting screws (16, Figure 9-3or Figure 9-4)on the microprocessor board (top board).

3.The J8 connector (heater leads) can be accessed by moving the J1 connector leads out of the slot on the microproc- essor board (17) and sliding the elec- tronic assembly (12) partially out of the housing (Figure 9-6).

4.Squeeze the J8 connector on the sides and carefully remove. The electronic assembly can now be completely re- moved from the housing.

5.Completely remove the three mounting screws (16) on the microprocessor board (17).

		1
POWER		+
SUPPLY
BOARD
		+
		+
	5A
	250VAC
	TIME LAG
		+
		+
	3	1
FUSE	D	+
	9
	9
	3	+
	1
	6
	G
	REV

22220058

Figure 9-7. Fuse Location

Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Service 9-11