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E -
RICERCA GUASTI
FAULT-FINDING PROCEDURE
CAUTION : if the mains voltage is too low, a safety mechanism prevents the set from being used.
The safety mechanism will be released automatically when the main voltage has returned to normal (220V -
10 %).
Normal cycle
Power on
Power on indicator lit
Fan rotates
Green
thermal safety
2
indicator lit
No load on set
Standby voltage :
2
This indicator light shows that the set is ready to be used. It will go off if the set heats up to too high a
temperature. The set can only be used again once the temperature has returned to normal (when the
indicator light will come on again).
-25
E
Problem
Indicator off
Fan does not rotate
Green indicator off
Voltage nul
Probable cause
Indicator faulty
Mains supply
ON/OFF switch
Fan faulty
Fuse defective
Indicator faulty
Thermal safety circuit
broken
Aux. transformer TA1
Control board
Poor contact
Aux. transformer TA1
Control board
Checks
If the fan is rotating,
indicator faulty
Check the mains supply
and the mains lead
Check
Check
Check
Check
Unplug the set and use
an ohmmeter to check
R ≈ 0 between 3
that
and 4 on B2 on the
control board
Measure :
18V ~ between 2 & 1 on
B3
18V ~ between 2 & 3 on
B3
Measure
+ 15V between 10 & 11
on B5
— 15V between 9 & 10
on B5
Check connections on
the different connectors
Measure :
18V ~ between 2 & 1 on
B3
18V ~ between 2 & 3 on
B3
Measure :
160
PRESTOPAC
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