Doc. CEI12166
Rev. 1
Pag. 38 Of 47
. Open CBA1000;
. There are four wires from the battery (80), connected to two connectors going to the front-panel board
(60): remove the connectors and power-on again.
. If the test set is now operating, the battery (80) should be dismounted and replaced.
. If the test set is not yet powering-on, power-off and disconnect the four-way connector from the power
supply module (81) to the front-panel board (60); then power-on and measure the following voltages,
taking the black wire as the reference:
. Red wire: + 5 V;
. Brown wire: 12 V;
. White wire: 21 V.
If any of these voltages is missing, in particular the + 12 V, the test set cannot operate: the auxiliary
power supply module (81) should be dismounted and replaced.
If voltages are OK, but no power-on, the test set needs to be returned.
3.4.2 The test set is locked up
In this situation, the fault is likely to be located in the MICR board (61). The removal is performed
unscrewing the four screws: there are two connectors on both edges. Fit the replacement one, and
verify: if the test set is OK you can continue; else, the test set needs to be returned.
3.4.3 The control knob does not operate
First of all, check that the knob is blocked on the encoder shaft. To this purpose, remove the plastic cap
in front of the wheel: you get access to the locking nut. Check that it is tight; else, put a piece of paper
below the knob, in order to create a gap between knob and front panel, and tighten the nut; then, set
back the plastic cap.
If the encoder is broken, it is possible to remove it with the following steps:
. Remove the MICR board, unscrewing the four screws;
. Disconnect the flat cable;
. Remove the knob and unscrew the encoder: it can be withdrawn.
Fit the replacement one, and verify: if the test set is OK you can continue; else, the test set needs to be
returned.
3.4.4 A coil driver doesn’t close
In this instance, the fault is likely to be located on the corresponding coil driver board, PWA11428: to
the left, the board for C and O1; to the right, the board for O2 and O3.
. Remove CBA1000 from the container.
. Locate the faulty board, (63) OR (64).
. Remove it, by unscrewing the two screws to the L-shaped support.
