2007.03.07Flow2 stairliftTab 06: Systematic fault finding
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Flow subsystems
Guidelines for fault finding
Check whether the green LED on the power module is lit when the stairlift is switched on. This
indicates that all the supply voltages are present. If the green LED is not lit, carry out the following
checks:
- Check whether the supply voltage on the power board meets the conditions.
- Measure the battery voltage between the "plus" and "min" terminals?
- Is the main power circuit fuse still intact?
- Are the glass fuses still intact?
- Is the on/off switch on?
- Are the connectors on the batteries and the power module secure?
- If the battery voltage is too low, it is possible that the battery charging is not working properly.
The charging process can be checked simply by measuring the DC voltage across the battery
terminals. To measure this, the stairlift must first be driven away from the charging contact and
then back onto the charging contact. The voltage should then gradually increase to the
maximum voltage.
- The problem can also be caused by other printed circuit boards and wiring.
- Disconnect the flat cable from the power module to the mainboard and check whether the
green LED lights again. If the LED lights, the fault is in the associated printed circuit board.
If all of these items have been checked and the green lamp on the power module still does not light
when the stairlift is switched in, replace the power module.
NOTE
On the power module there is a coil that can become very hot while the batteries are
being charged. This is normal.
The measuring points for the various voltages are indicated on the power module.
If the main power circuit fuse has blown, check the wiring from the batteries and the
printed circuit boards before you replace the fuse.
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