Sharp ER-1911 Service Manual page 27

Drawer control
[Without option drawer]
'The DRD signal output from the pin 11 of the 74. HC00.drives C378K
to apply current to the drawer magnet.
[With option drawers]
Fig, 2-15
In case an optional drawer is in-use, drawers are driven by the DRD
signal issued from the pin 11 of the 74HCO0 and DRA through DRE.
A spark killer diode is cintained in the M54532P.
Power supply circuit
1) Block Diagram
vp
FA
voise
vec
yop
Option drawer
Option drawer:
D
Option drawer
Drawer
Opensensor