Sailor COMPACT HF SSB T2130, Technical Manual

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3 SERVICE T2130
PAGE 3-8
3.4.4 POWER SUPPLY (MODULE 4)
3.4.4.1
If all output supplies are missing, check the main fuses F02 and F03 (20A) located on the Connection
Board (6).
3.4.4.2
If only the +18V, -18V, +9V are missing the fault is in the switch mode power supply.
3.4.4.3
Check the voltage on U01 pin 13, 12V (heatsink as common).
3.4.4.4
If zero voltage, check fuse F01 (3.15A) on the Connection Board (6).
3.4.4.5
If it is ok, disconnect the gate and source on switching Fet’s on Q02 and Q03.
3.4.4.6
Then check the waveforms on U01 pin 11 and 12, see below.
3.4.4.7
If not ok, then the fault is in U01.
3.4.4.8
If ok, then reconnect the gate and source and check the waveforms on U01 pin 11/12, see below.