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3745 MAPs
020 (continued)
Is only +5 V present and within toler-
ance?
Yes No
021
– Exchange the Primary Power Box.
Go to “PS2 and Primary Power Box
Exchange Procedure” on
page 4-69.
022
– Exchange the PS2. Go to “PS2 and
Primary Power Box Exchange Procedure”
on page 4-69.
023
Exchange the FRU group 37. Go to “3745 FRU
Group Table” on page 1-49.
024
.
– At the power control window, check the mode
validity.
1 = Host
2 = Network
3 = Local
Is the power mode in accordance with cus-
tomer requirements?
Yes No
025
Correct the power mode and try again.
026
Is the power mode in local 3 displayed in the
power window?
Yes No
027
– Press Power Control until the correct
mode is displayed in the power control
window.
– Press Validate.
Continue with Step 028.
028
.
– Press Power On.
Is the 3745 failing to power ON?
Yes No
029
– You may have an intermittent problem.
Before you continue, perform another
Power OFF/ON to check that the problem
still exists in that mode.
If it does not, go to “MAP 3905: Power ON
Problem in Host Mode or Host Power
Sequence Problem” on page 2-16.
030
Is the UEPO switch (on the control panel), in
the Power Enable position?
Yes No
031
.
– Put the UEPO switch in Power Enable
position as follows (see Figure 2-3 on
page 2-21):
Loosen the two screws.
Move the metal slider completely to
the left.
Set the switch to I.
Move the metal slider to the right.
Secure the screws.
Retry the operation that brought you here.
032
Is Power On indicator ON?
Yes No
033
Does the control panel display a
hexadecimal code?
Yes No
034
– Exchange the FRU group 37. Go
to “3745 FRU Group Table” on
page 1-49.
035
– Record the value of the hexadecimal
code at the control panel.
Go to “3745 Control Panel Codes” on
page 1-15 and follow the action to be taken.
036
Normally (when the Power ON Indicator is lit),
relay K1 in the primary control box is closed and
the ac voltage is distributed to the rest of the
machine.
Nevertheless, in case of a severe under voltage of
the ac mains, the Power ON command may be
memorized but not fully executed.
The Power On lamp is turned ON but the K1
remains OFF.
Consequently, all power supplies and blowers
remain OFF.
– Using a CE meter, check for 28 volts between
position 2 and ground on the UEPO switch (see
Figure 2-3 on page 2-21).
(Step 036 continues)
Chapter 2. Map for FRU Isolation 2-23