5.2 - Service electronics
M2007/3en
TCT-2301 Service instructions
91
©BTG 2004
The new card will not have any information about calibration and other
settings.
Connect SPC with the reinstalled safety copy and push
,
to the instrument.
If no safety copy is available see section 4:
Operating instructions
.
!
Perform a new water calibration as in section 5.3.2:
Check clear
water value and clean of probe
.
5.2.5
Change of power supply
If there is something wrong with the 24V-power supply, the whole part
must be changed.
All numbers refer to fig 49 on page 90.
Before opening the electronics box, disconnect line voltage to the unit.
!
Remove line voltage to the card (it is not sufficient to cut it off with
the switch on the card).
1. Unscrew lower cover (2).
2. Check that all LEDs are switched off (12). If not, the power is still
on and should be disconnected.
3. Open the protection front cover.
4. Loosen the four screws on the front (1) and carefully lift out the front
plate. Loosen the display switch (5) by pulling it straight out from the
card. Also loosen the SPC-connection (11) by pulling it straight out
from the card. It may be necessary to loosen the locking flap using a
flat screw driver.
5. Loosen connectors (6 & 10) from the power supply card.
6. Unscrew the four tall nuts (9) with the socket wrench.
7. Lift the power supply unit (8) straight out.
To mount the new power supply unit, reverse the above procedures.
Tools required:
Star screwdriver (medium size),
Socket wrench or Block wrench 7 mm
Send
data
Send
all
DANGER!
High voltage within the
electronics box.
Connections may only be
carried out by qualified
personnel.