Siemens Servo Screen 390, Service Manual, Page: 38 / 49

Servo Screen 390
38 E382 E394E 061 01 02 02
Siemens-Elema AB
5. Troubleshooting
5
Malfunction
Action
Servo Screen 390 will not start. The display
is not illuminated and there is no start-up
beep.
• Check/replace the external power cable/
connectors.
• Check that the power supply source
(ventilator or external power supply) works
properly.
• Check the fuse F1 on PC 1663.
• Check/replace the internal power cable/
connectors.
• Check/replace the Servo Screen 390
power switch and its cable/connector.
• If none of the above, replace PC 1663.
• If none of the above, replace PC 1662/
PC 1835.
The display is illuminated at power on and
one or more start-up beeps can be heard
within 20 s after power on. Thereafter the
display may flash or will be completely
illuminated. A connected CRT display is not
illuminated and shows no text. • Hardware failure. Replace PC 1662/
PC 1835.
The display is not illuminated, but a
connected CRT display is illuminated and
shows the start-up sequence. • Check/replace the display power and
signal cables.
• If not the above, replace the display.
• If none of the above, replace PC 1663.
• If none of the above, replace PC 1662/
PC 1835.
Before starting troubleshooting, try to elimi-
nate all possibilities of operational errors. If
the malfunction remains, use the trouble-
shooting guide below. Perform actions step
by step and check that the malfunction is
eliminated.
When the fault is corrected, carry out a
Functional check as described in the
Operating Manual, chapter 4, “Startup and
shutdown”.