Adjusting +5V Voltage - Epson SRC520 Manual

4.5.3 Adjusting +5V Voltage

You may adjust the +5V voltage for the DMB control circuit using a control knob, VR2,
as follows:
(1) Shut down Windows 95, and turn OFF the Control and Drive Units.
(2) Remove the Upper Cover of the Drive Unit by unscrewing the eight set screws.
(3) Remove the Motor Driver module by unscrewing the two set screws.
(4) Turn ON the Drive Unit.
(5) Measure the voltage between the through-holes marked as VCC and GND near J16
connector on the DPB.
(6) If the +5V voltage is not within the range of 4.9V to 5.2V, adjust the voltage as
follows:
(7) If the measured voltage is lower than 4.9V, turn the VR2 on DPB knob "+" direction
by 1/2 track to increase the voltage. If the measure voltage is higher than 5.2V, turn
the VR2 knob "-" direction by 1/2 track to lower the voltage
(8) Repeat the step (5) to ensure that the voltage is between "4.9V and 5.2V".
(9) If necessary, repeat the steps (7) and (8) until the voltage is within the range of "4.9V
to 5.2V".
(10) After the adjustment, place the Motor Driver module back on.
Turn OFF the Drive Unit and place the Upper Cover back on.
(11)
Maintenance 4.5 DPB (Drive Unit)
137