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8.4
Replacing single printed circuit boards (PCBs)
Switch off the power supply before opening the housing.
1)
Remove the cover from the terminal compartment (remove 2 screws).
2)
Pull all cables out of the plug-in terminals.
3)
Remove the glass cover from the control compartment (remove 4 screws).
4)
Remove 4 screws from the front panel, take hold of the handle on the upper end of the front panel and carefully pull out
the complete electronic unit of the signal converter housing.
5)
Put down the electronic unit with the front panel
F
facing down.
6)
Remove screw(s)
S
LP
from the PCB(s) to be replaced and carefully pull out the PCB(s) of the plug base(s). Fit new
PCB(s), refer to the illustration in sect. 8.3.
•
When
replacing the PCBs FSV and/or ADC
, always remove both PCBs together as they have a common plug-
and-socket connector.
•
When
replacing the ADC PCB
, carefully move the data EEPROM
IC14
from the old to the new PCB and
observe the direction of the IC during plugging. After changing the EEPROM from the old to the new electronic unit,
no further adjustments or settings are required. Refer to the illustration in sect. 8.5.
7)
Re-assemble in reverse order (items 6 – 1 above)
8.5
Illustrations of printed circuit boards (PCBs)
Power unit PCB, NT, 100 – 230 V AC
X1
plug-in terminals inside terminal compartment
X2
internal connection to motherboard
T
transformer
Small fuses TR5, values and Order No. see sect. 9:
F1
5 V voltage
F2
field current supply
F3
current output and power supply
F4
auxiliary voltage
F7
power supply
F8-F10
coupling elements
Inputs/outputs PCB, I/O
