156 Powermax125 Service Manual 808070
8 – Troubleshooting and System Tests
Test 5 – Flyback circuit (DC minor voltages)
Symptom: Minor voltages are not present.
Wear proper personal protective equipment (PPE) before testing powered equipment.
The flyback circuit is the source of the minor DC voltages in the power supply. It provides +3.3 VDC, +5 VDC,
+24 VDC, and +48 VDC.
Check the voltages as described in Table 12. If a value is not within ±15%, perform the appropriate test later in this
section.
Table 12
Figure 25
Volts DC Test points (use chassis for negative)
All units
+48 J1 – pin 1
+24 J5 – pin 1
+5.0 J3 – pin 3
+3.3 J15 – pin 4
DSP board
J15, pin 4
Power board
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