(a)
Set the decade resistance box to 500 ohms.
S 035-297
(3)
Disconnect the electrical connector from low limit valve of the left (right) pack.
(a)
Connect 80 ohms resistance to pins 1 and 3 of the electrical connector for the low limit valve.
(b)
Connect the DC Voltmeter also to pin 1(-) and pin 3(+) of the electrical connector for the low limit valve.
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(4) Turn the L (R) PACK selector, on the P5 panel, to AUTO. (a) Make sure the voltmeter shows 0 vdc.
S 715-300
(5) Slowly increase the decade box resistance to 1000 ohms. (a) Look at the ECS maintenance page. 1) Make sure the L (R) TEMP VALVE indication, on the EICAS lower display, increases to 0.95 - 1.0. 2) Make sure the L (R) PACK INOP light comes on. (b) Make sure L (R) PACK TEMP shows on the top EICAS display. (c) Make sure the voltmeter shows 8-10 vdc.
S 715-301
(6) Push and hold the L (R) PACK RESET button-light, on the P5 panel, for 3 seconds.
(a) (b) Make sure the L (R) PACK INOP light stays on.Make sure L (R) PACK TEMP shows on the top EICAS display.
S 865-302
(7) Turn the L (R) PACK selector, on the P5 panel, to STBY-N.
S 715-402
(8) Push and hold the L (R) PACK RESET button-light, on the P5 panel, for 3 seconds.
(a) (b) (c) Make sure the L (R) PACK INOP light goes off.Make sure L (R) PACK TEMP does not show on the top EICAS display.Make sure the L (R) TEMP VALVE indication, on the ECS maintenance page, decreases to less than 0.06.
S 715-401
(9) Decrease the decade box resistance to 500 ohms.
S 715-304
(10) Turn the L (R) PACK selector, on the P5 panel, to AUTO.
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(11)
Disconnect the decade box from the electrical connector of the No. 1 compressor outlet temperature sensor of the left (right) pack.
(a)
Make sure the L (R) PACK INOP light, on the P5 panel, comes on.
(b)
Turn the COMPUTER selector, on the forward electrical control stand P9, to L.
(c)
Make sure L (R) PACK TEMP shows on the top EICAS display.
(d)
Make sure L (R) PACK BITE shows on the bottom EICAS display.
S 715-306
(12)
Turn the COMPUTER selector, on the P9 panel, to R.
(a)
Make sure L (R) PACK BITE and L (R) PACK TEMP show on the top EICAS display.
S 715-307
(13)
Turn the L (R) PACK selector, on the P5 panel, to STBY-N.
(a)
Make sure the L (R) PACK INOP light goes off.
(b)
Make sure L (R) PACK TEMP does not show on the top EICAS display.
S 715-308
(14)
Turn the L (R) PACK selector, on the P5 panel, to AUTO.
(a)
Make sure the L (R) PACK INOP light comes on.
(b)
Make sure L (R) PACK TEMP shows on the top EICAS display.
S 435-309
(15)
Connect the electrical connector to the No. 1 compressor outlet temperature sensor on the left (right) pack.
(a)
Make sure the L (R) PACK INOP light goes off.
(b)
Make sure L (R) PACK TEMP does not show on the top EICAS display.
S 745-310
(16) Push the VERIFY and the RESET buttons on the face of the left (right) pack temperature controller.
NOTE: This will erase the failure from the BITE memory.
____
(a) Make sure L (R) PACK BITE does not show on the bottom EICAS display.
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