5.2 - Service electronics
M2007/3en
TCT-2301 Service instructions
89
©BTG 2004
5.2.4
Changing the electronics card
If the circuit card is faulty the complete card must be replaced.
It is important to save all card information in the SPC before removing
the card. All information about calibration and other settings are in the
instrument. If no previous print out or backup is available, make one be-
fore removing the card.
!
Before replacing the card, disconnect line voltage to the card (it is
not sufficient to cut it off using the switch on the card).
All numbers refer to fig 49 on page 90.
1. Unscrew the lower cover on the box (2).
2. Check that all LEDs are off (12). If not, power is still on and should
be disconnected.
3. Unscrew the optical holder (4) and loosen the optical connection.
Put the protective cover over the optical connection.
The cover is included with delivery.
4. Screw out the inner optical holder (3) that is screwed to the optical
module on the circuit card.
5. Loosen all connection blocks (13) to which cables are connected.
Screws need not be screwed out as the contact strip can be pulled out
from the card.
6. 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.
7. Unfasten the screws (7) holding the card to the box.
8. The card can now be removed – carefully, due to the tight space. Lift
first the upper part with display connection (5).
Insert the new card by following the instructions above in reverse.
Ensure the optical connection is inserted in the correct position (see fig
23 on page 29).
Install the connection pipe (3) before screwing down the card in the box.
Check that optical unit, intermediate washer, box wall and connection
Tools required:
Screwdriver (medium size),
Star screwdriver (medium size),
Block wrench 19 mm.
DANGER!
High voltage within the
electronics box.
Connections may only be
carried out by qualified
personnel.