powersoft IpalMod Service Manual page 10

IPALMOD | SERVICE MANUAL
Switch the module on in DC (18Vdc)
With an oscilloscope, check the gates of the mosfets Q8
and Q9, as portrayed in (Fig. 15)
Checking the output stage
Remove any DC power supply that may be connected
on the primary side.
Plug the DIGIMOD AMP VOLTAGE AUX flat cable to the CN13
connector.
Connect the Pressure Sensor to the DSP Board.
Connect the DPC Interface Board to the DSP Board
Supply auxiliary voltages ±18 V
and monitor the current drawn by the module:
Positive +18 V @ 670 mA ±10%
DC
Negative –18 V @ 66 mA ±10%
DC
Positive/Negative rail ±15 V @ 20mA ±10%
DC
Check the auxiliary voltage at the CN14 connector:
–12 V ± 5% pin4 @ CN14 to FA8
DC
+12 V ± 5% pin3 @ CN14 to FA6
DC
Check the voltage by probing between the MUTE pin 2
and a ground connector (pin 1, 2):
3.5 V ± 10%
DC
As portrayed on (Fig. 16)
10
and rail voltages ±12 V
DC DC
(Fig. 15)
–12 V 20 mA +12 V
–18 V 66 mA +18 V
+ -
(Fig. 16)
Q8
Q9
20 mA
670 mA
V