50
8 transistor module control LEDs
LED checklist
Fig. 16 LED indicators on PC board BPS 25/BPT 27
1 x 15 V primary supply LED
2 control LEDs
Boost converter
Measuring points In every transistor module there are 4 MOS-FETs (metal oxide semiconductor field
effect transistors) with diode. This diode provides information about the state of the
transistor:
using a diode tester, a diffusion potential of 0.4 - 0.5 V must be measured. If this voltage
cannot be measured, the module is faulty.
Fig. 17 Measuring points on the BPS 25/BPT 27 PC board
4 x diode
(module M1)
4 x diode (module M3)
4 x diode
module M2
Charging resistor (PTC)
120 R at 25°C
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