Nokia 445PRO, Service Manual, Page: 16 / 67

445N
14
2. Site Preparation
2.1. Location
This Monitor is designed for normal office conditions. It is equipped with own power supply. It is not
to be serviced or repaired on site
2.2. Troubleshooting
Local service facilities should perform simple maintenance such as trimming. More advanced main-
tenance and repair that requires replacement of components which in turn requires testing and re-
trimming should be carried out in a central workshop.
Symptom Measures
Picture
screen is
blank
The indi-
cator on
the front
panel is
not illumi-
nated
Check that the power cord is correctly connected to the monitor and to the power
outlet. If the monitor is powered through the computer, check that the computer is
switched on with the mains switch. Use a desk light, for example, to verify that
current is connected to a power outlet. If no electricity is connected to the outlet,
call an electrician.
nated
Unplug the monitor from power outlet for about one minute.
The indi-
cator on
th f t
Check that the signal cable connector is connected. If the connector is loose
tighten the connector’s screws.
the front
panel is il-
luminated
The Monitor might be in stand
--
by position. Push one of the buttons or move the
mouse.
luminated
Unplug the monitor from outlet for about one minute Unplug the monitor from outlet for about one minute.
Switch off the monitor and the computer. Remove the signal cable from the
computer. Switch on the monitor using the power switch. If the Selftest error menu
appears on the screen, it is evident that the monitor functions correctly and
the problem is caused by an error in other parts of the system.
Check the signal cable’s connection pins. If the pins are slightly distorted,
use nose pliers to straighten them.
The computer may use a timing values which are
out of the monitor’s synchro-
nization range.
Picture has colour de-
f t
Demagnetize the monitor.
fects
If colour defect is repeated without the monitor having been moved, it is possible
that the monitor is influenced by a strong magnetic interference field (near to
a high power cable, for example). Try to find a better location for the monitor or
the interference source. Note that another monitor placed too near (less than
30 cm.) may also generate interference in the picture.
Picture has strong colour
defect,
Switch off the monitor and the computer. Remove the signal cable from the
computer. Switch on the monitor using the power switch.Check the colour of the
Red, Green and Blue bars. If they have pure colours, the fault is not in the monitor.
Check signal cable connectors and the computer. If the menu itself and the colour
bars are discoloured, the monitor is obviously damaged.
Picture is stable but dis-
torted
Your computer may use a timing for which the corresponding picture characteris --
tic adjustments have not been set at the factory. Adjust the picture characteristics
Picture is unstable Check the proximity of other electrical devices that generate magnetic fields,
such as speakers, other monitors, electric fans and fluorescent light fixtures. suc as spea e s, ot e o to s, e ect c a s a d uo esce t g t tu es
Make sure your computer and video card are properly configured for your
monitor.
The automatical appearance of the Error menu on the screen means that the signal is faulty or miss-
ing.
ERROR
Red
Green
Blue
Signal: No valid
Cable connected OK
ERROR
Red
Green
Blue
Signal: No signal
Cable not connected