Voltage Conversion - Adcom GFP-750 Service Manual

GFP*750
Voltage Conversion
Converting
from 120V
to
240V
operation
1
Disconnect the
AC
cord
and remove
the lop cover
2-
Move
the blue
secondary
wire
Irom
P7lo P14artdmove
the white secondary wire from
P6
to
PI
3
-
see
figure
1
below.
3.
Change
fuse
F2
to
1A/250V SLB.
4.
Change
fuse F1
1
to
250mA/250V
SLB.
5.
Remove
fuse F12.
6.
Remove
the rear panel
mounted
'switched AC-outfet" jack (J6
on
schematic)
and
the black
and
red
connecting leads from the jack
to
PISand
PSonthedrcuit
board.
Cover
the chassis hole with rubber
blocking plate
(ADCOM
part
#:250010Q2).
Figure
1:
Main transformer connections
and
fuse values
for
240V
operation.
Converting from 240V
to
1
20V operation
1
.
Disconnect
the
AC
cord
and remove
the lop
cover
2.
Move
the blue
secondary
wire
from
P14
to
P7 and
move
the white
secondary
wire
from
P13
to
P6
see
figure
2 below.
3.
Change
fuse
F2
to
2A/250V
SLB.
4.
Change
fuse F1
1
to
500mA/250V
SLB.
5.
Change
fuse
F12
to
1
A/250V SLB.
6.
(Optional)
The QFP-750 240V
version
does
not
have a
rear panel
mounted
'switched AC-outlet"
jack.
The
position for this jack, at the top right
hand
side of the rear panel,
has been
blocked with a rubber
plate
on
240V
versions.
To add
the 'switched ACH>ullef you
will
need
the
female
AC
jack
(ADCOM
part
#
:26000760)
and
connecting wire set
(ADCOM
part #:48000075).
Remove
the
rubber block and
mount
the
AC'jack
to the rear panel.
Connect
the black wire from
PIS on
the
circuit
board
to
the
neutral (larger
slot)
connection of the
new
switched
AC
jack.
Connect
the red wire
from
P8 on
the
circuit
board
to
the
live
(smaller
slot)
connection
on
the
new
switched
AC
jack.
Optional: Connoci
BlicK
to
nautru
Figure
2:
Main
transformer connections
and
fuse values
for
120V
operation
12