(a)  
Push the DISPLAY SELECT switch for the ELEC/HYD display on the EICAS maintenance page (P61).

 (b)  
Set the selection switch, on the EICAS computer panel (P9), to the AUTO position. 1) Make sure these EICAS indications show:

 a)  For the left power channel, AC-V = 0 FREQ = 0.
 b)  For the right power channel, AC-V = 0 FREQ = 0.
 c)  For the ground power, AC-V = 115 |5 FREQ = 400 |5
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 S 715-007
 (3)  Do a check of the L (R) GEN CONT switches:
 (a)  
Set the L (R) GEN CONT switches, on the P5 panel, to the OFF position. 1) Make sure the yellow OFF light in each switch stays on. 2) AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON GENERATOR

 FIELD AND HYDRAULIC CONTROL PANEL;
 Make sure the white FIELD OFF light, in the generator field
 switches (P61), are on.

 (b)
Set the L (R) GEN CONT switches (P5) to the ON position.

 1)  Make sure these lights are on: a) The yellow OFF light in L (R) GEN CONT switches (P5). b) The white ON light in the EXT PWR switch (P5).
 2)  Make sure the BUS OFF lights (P5) are off.
 3)  AIRPLANES WITH FIELD OFF SWITCHES INSTALED ON GENERATOR FIELD AND HYDRAULIC CONTROL PANEL; Make sure the L (R) FIELD OFF lights (P61), are off.
 (c)  Make sure the yellow DRIVE light, in the L (R) GEN DRIVE DISC switches (P5), are on.
 S 715-008
 (4)  
Operate the left engine (Ref 71-00-00).

 S 715-009

 (5)  
After 30 seconds, do a check of these lights:

 (a)  Make sure these lights are off: 1) The DRIVE light in the L GEN DRIVE DISC switch (P5). 2) The OFF light in the L GEN CONT switch (P5). 3) The BUS OFF lights (P5). 4) AIRPLANES WITH FIELD OFF SWITCHES ON THE GENERATOR FIELD
 AND HYDRAULIC CONTROL PANEL, P61; The L FIELD OFF light.
 NOTE: If you pushed the switch for the GEN DRIVE DISC
____ because the yellow DRIVE light came on, do the engine shutdown procedure (Ref 71-00-00). Isolate the problem which caused the DRIVE light to come.
 (b)  Make sure these lights are on: 1) The yellow OFF light in the R GEN CONT switch (P5).
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 2) 3)  The yellow DRIVE light in the R GEN DRIVE DISC switch (P5).The white ON light in the EXT PWR switch (P5).
 S 715-010
 (6)  Make sure these EICAS indications show: (a) For the left power channel, AC-V = 115 | 5 FREQ = 400 | 5. (b) For the right power channel, AC-V = 0
 FREQ = 0.
 S 715-011
 (7)  Push the EXT PWR switch (P5). (a) Make sure these lights are off: 1) The ON light, in the EXT PWR switch (P5). 2) The OFF light, in the L GEN CONT switch (P5). 3) The two BUS OFF lights (P5). 4) AIRPLANES WITH FIELD OFF SWITCHES INSTALED ON GENERATOR FIELD AND HYDRAULIC CONTROL PANEL; The L FIELD OFF light (P61).
 S 715-012
 (8)  Push the EXT PWR switch (P5) again. (a) Make sure these lights are on: 1) The yellow OFF light in the L (R) GEN CONT switches (P5). 2) The white ON light in the EXT PWR switch (P5). (b) Make sure these lights are off: 1) The two BUS OFF lights (P5). 2) AIRPLANES WITH FIELD OFF SWITCHES INSTALED ON GENERATOR FIELD AND HYDRAULIC CONTROL PANEL; The L FIELD OFF light (P61). (c) Make sure the yellow DRIVE light, in the R GEN DRIVE DISC switch (P5), is on.
 S 715-013
 (9)  Operate the right engine (Ref 71-00-00).
 S 715-014

 (10) After 30 seconds, make sure these lights are off:
 (a) The DRIVE light in the R GEN DRIVE DISC switch (P5).
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