Table 4-17: Led Definitions - Tektronix MSO70000 Series Service Manual

Troubleshooting (MSO/DPO5000 Series)
4–50
COM-E Interface Board LEDs. If DS19, DS18, or DS10 on the COM-E Interface
board lights, use the following information to determine the meaning. If none of
these LEDs come on, it is likely a power supply issue or a faulty COM-E Interface
board (corrupted firmware in the MCU). The table and the following text provide
details about these LED conditions.
Table 4-17: LED Definitions
LED
DS19
DS18
DS10
DS19: DC-DC OK (Green)
This light comes on after the oscilloscope power button is pressed and the
oscilloscope is in the normal operating mode. If this light is on, it means
that all of the COM-E Interface board power supplies are up and within
spec. It also indicates that all of the DC power supplies on the Main board
are working. It does not check the power supplies on the Main board to see
if they are within tolerance or working correctly.
DS18: PS_ON (Green)
This light comes on when the Standby power supply is plugged in and the
oscilloscope is in the Off state. (It is plugged into an AC outlet but not turned
on.) This light goes out when DC-DC OK turns on. This light is also typically
on when the front-panel power button is amber.
DS10: Fault (Red)
This LED indicates a problem with the system. When it flashes, it generally
means something is wrong on the COM-E Interface board (typically the
power supply). It can also indicate a communication problem between the
COM-E Interface board and other systems. This LED will flash after a fault
is discovered on the board, unless the error is a CRC failure (bad FLASH
memory). Each error uses a different flash period and delay between flash
bursts.
The speed of the flashes determines the error number, which defines the error
type (for example, very slow flashing indicates Error 1.) Error 1 is fatal during
startup or shutdown. During normal operation, Error 1 is a warning indicating
that a converter is operating near the tolerance limits. (See Table 4-18 on
page 4-51.)
The number of flashes points to the problematic DC/DC converter or circuit.
A DC/DC converter has a startup or shutdown failure if it fails to cross
MSO70000/C, DSA70000B/C, DPO70000B/C, DPO7000, MSO5000, DPO5000 Series
Color Definition
Green On if all of the DC/DC converters are operating
properly.
Green On if the PS_ON signal to the COM-E board
is high. (Power is off.)
Red On if a fault was detected (see the following
information about DS10 conditions).