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3745 MAPs
MAP 3905: Power ON Problem in Host Mode or Host Power Sequence
Problem
Symptom Explanation Conditions That Could Cause This Symptom
Power ON is not possible in host
mode.
The host system detects errors
during the power ON sequence.
The Power Control is not in host mode
Host or host cable problem
Remote power control box (EPO)
PCC card
Attention
Power may be present when nothing is dis-
played on the control panel.
001
When the power control is in host mode, a 1 is
displayed on the control panel.
Is the power control in host mode?
Yes No
002
– If the panel is blank; go to “Power MAP
3930: Power Control Subsystem
Problems” on page 2-21.
– If not, put the power control in host mode:
Using Power Control, scroll till the
value is 1.
Press Validate.
Re-initiate the command.
Continue with Step 003.
003
Is the 3745 powered ON?
Yes No
004
Go to Step 010.
005
– Check for 28 V between the frame ground and
the back of the host connector which initiated
the command at EPO 01S, pins 3 and 4. Refer
to Figure 2-2 and to Figure 4-2 on page 4-4.
Is 28 V present on pin 3?
Yes No
006
There is a host problem, or an external host
cable problem.
If no problem was found, contact your
support structure. Refer to “Contacting
Support” on page A-1.
007
(Step 007 continues)
Pin 1 Pin 4
Pin 3 Pin 6
J5 J6 J7 J8
Figure 2-2. EPO Location 01S
007 (continued)
Is 28 V present on pin 4?
Yes No
008
– Exchange the FRU group 53 “3745 FRU
Group Table” on page 1-49
009
There is a Host problem, or an external host cable
problem.
If no problem was found, contact your support
structure. Refer to “Contacting Support” on
page A-1.
010
– Try to power ON in local mode:
Using Power Control scroll till the value is
3.
Press Validate.
Is Power ON possible in local mode?
Yes No
011
Go to “Power MAP 3930: Power Control
Subsystem Problems” on page 2-21.
012
– Press Power Off.
– Put the power control in host mode:
(Step 012 continues)
2-16 3745 Models 130 to 17A: MIP