IBM 3274 51C Maintenance Information page 64

Map A122 Power On Ind. is
Off and Fan Not Turning
PAGE 2 OF 6
(Step 001 continued)
• Verify fuse Fl on primary power box.
Is the fuse blown?
Y N
002
• Verify that 3274 power cable is connected to an active outlet.
• Verify that the power cable plug is connected tightly on the
back of the 3274.
DANGER: Input A.C. voltage is present at power on switch
terminals and plug Pl when 3274 power on-off switch is in off
position.
• Measure for the correct input A.C. voltage for your machine
at prime power box plug Pl between pins 1 and 2. Note:
measure with plug Pl connected. See Figure B 1.
Is the correct A.C. voltage present?
Y N
003
• Disconnect the 3274 power plug from power outlet .
• Verify for open or defective power line cord/plug .
• On prime power box verify for good socket J 1 and cable
plug Pl connection at pins 1 and 2.
Go To Map A100, Entry Point A.
004
• Measure for input A.C. voltage·at prime power plug Pl
between pins 3 and 4. Note: measure with plug Pl
connected. *A*
Is the correct A.C. voltage present?
Y N
005
• On prime power box verify for good socket Jl and cable
plug Pl connections at pins 1 thru 4.
• An open cable/power on switch (S13) is indicated.
Replace OPS panel power on switch/cable assembly. See
Figure 4-15.
MAP A122-2
*A*
Verify that A.C. line voltage is switched through power on switch.
Chapter 3. Maintenance Analysis Procedures 3·37