52
Corrections
1.6.4 calibrate voltage to 2.2V by adjusting the
internal potentiometer. This operation must
be done with great care to avoid electrical
shock.
— Replace faulty coil and reset fuse.
— Replace faulty unit.
— Replace faulty board.
Possible cause check-up and tests
1.6.4 Check the 5VDC voltage.
— Connect the negative probe of the
multitester to TP1 (GND).
— Connect the positive probe of the
multitester to TP2. The indication of
the instrument must be 4.9÷5.3V.
— Check if the fuse of the power supply
is blown. It is possible that one of the
valve coils or the electronic board cause a
short circuit.
— Disconnect the power from the AC-
T1 board/connector JP2, and
switch on the unit. If in no-load
condition the power supply delivers
12V and 5V voltages, it can probably
be that there is a problem on one of
the boards, one of the inputs or
outputs.
— Connect the AV-T1/JP2 connector back
to the board and disconnect the
connectors JP6 (inputs), JP5 (outputs),
pressure sensor.
— Reapply the power from the ANL-T2
board.
— If the voltages 12V and 5V reappear,
the problem is one of the external
elements connected to the system
(valves, sensors, etc.).
— If voltages 12V and 5V do not appear,
one of the boards is damaged.
Disconnect board DIG-T2 and check
board ANL-T2.
Symptom
1. (cont.)
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