Il-Power
Oy
4N
3269
page
17/17
8.
TROUBLESHOOTING AND REPAIR PROCEDURES
1. You must study the working principle and the block diagram.
2. If device blows the fuse, you must measure with a resitormeasurement varistors R4 and R5, diodes V1-V4,
capacitors C6, C7 and fets V9, V13. Check the line voltage selectors triac V5.
3. If there is no short-circuit, check control IC N2 and feedback ICs N3, N7
4. If all outputs have gone, check voltage over C8
(2
280Vdc). If isn,t, check the circuits of supply voltage.
5.
The short-circuit of output can be checked by feed voltage from a current limit power supply. When a output
loads the power supply, check the capacitors, diodes and transzorbdiodes of the output.
6. If +5,1V,
f
l5V are gone or are too high, then a problem is in the linear regulators or ambient components of the
regulators. Check transzorbdiodes V27, V43 and V44.
7.
When the output 6,8-8,OV has gone, check DClDC-converter IC N8, transistor V33 and diode V36. Check also
V37, V40, V42 and V46.
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