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The +15V source
The 15V source is primarily used in the A-Board. It is applied to regulator IC7502
and IC7503 to obtain 9.2V and 5V output. The diode D560 rectifies the AC output
of the secondary winding of the transformer T502 to 15Vdc.
The other +12V and +5V sources
The diode D573 rectifies the AC output of the secondary windings of the
transformer T502 to 12Vdc. This voltage source is applied to the PA board and D
board of the unit. The 12V source is connected to the anode of the D566This 12V
source is also regulated by IC555 to create a 5V source that is used on the D
board.
The DR15V source
The diode D574 converts the AC output of the secondary windings of the
transformer T502 to DR15V. This voltage source is applied to the SC and SS
boards for Scan and Sustain operations. The PA board and fan control circuit
also uses the DR15 voltage source.
The VDA voltage source
Pin 11 of the secondary of the transformer supplies the VDA voltage for use on
the SS Board. This voltage is tied to a regenerative (power save circuit) that
rectifies the voltage as well as controls the output. It monitors and controls the
current used by the SS Board to achieve lower power consumption. The VDA
source is also connected to the voltage feedback circuit consisting of IC557 and
the optical coupler D558. It is the voltage source that is monitored to control the
voltage output of this power supply.
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