Specifications

MAP 1520: Power
Note: This is not a start-of-call MAP. Use this Power MAP only if you have been
directed here from a MAP step in
Diagnostic Information for Multiple Bus
Systems
.
This procedure is used to locate power problems in system units. If a problem is
detected, this procedure helps you isolate the problem to a failing FRU.
Observe the following safety notice during service procedures.
DANGER
An electrical outlet that is not correctly wired could place hazardous voltage
on metal parts of the system or the devices that attach to the system. It is the
responsibility of the customer to ensure that the outlet is correctly wired and
grounded to prevent an electrical shock.
Before installing or removing signal cables, ensure that the power cables for
the system unit and all attached devices are unplugged.
When adding or removing any additional devices to or from the system,
ensure that the power cables for those devices are unplugged before the
signal cables are connected. If possible, disconnect all power cables from the
existing system before you add a device.
Use one hand, when possible, to connect or disconnect signal cables to
prevent a possible shock from touching two surfaces with different electrical
potentials.
During an electrical storm, do not connect cables for display stations, printers,
telephones, or station protectors for communications lines.
CAUTION:
This product is equipped with a three–wire power cable and plug for the user’s
safety. Use this power cable with a properly grounded electrical outlet to avoid
electrical shock.
DANGER
To prevent electrical shock hazard, disconnect all power cables from the
electrical outlet before relocating the system.
Step 1520-1
You may be directed to this MAP for several reasons:
1. The power LED on the operator panel is not flashing, the operator panel display is
blank, and the power supply fans are not turning.
48 Service Guide