The voltage selection is visible on the jumper card, either 120 or 240 when the card is inserted into
the fuse assembly.
To change input voltage from 120 Vac to 240
Vac,
or vice versa, remove the fuse as explained
above, insert the point of a ball-point pen or pencil into the hole in the card and slide the card out
of the assembly.Turn the card so that the desired voltage shows on the upper left-hand side of the
card. Slide the card back into the assembly. Replace the fuse.
NOTE
Install the correct value of fuse
(F101)
as follows:
For 120
Vac
operation:
6.25 amperes, 25OV. Slow Blow.
For 240 Vacoparation:3.2 amperes,
25OV.
Slow Blow.
2.5 EXTERNAL CONNECTIONS
External connections are made to screw terminal strips
TS1
and
TB101
as shown in Figure 2-2.
When the optional output transformer 438-547 is used (balanced output), the jumpers between
terminals 1 and 3 and 2 and 4 on
TS1
must be in place. Plug the transformer into socket
Pl.
See
Figure 4-l for location of
Pl.
When the output transformer is not used (unbalanced operation), the
jumpers are not required.
Make external output connections to terminal strip
TSl.
For unbalanced operation, the speakers
connect to terminals 1 and 2. For balanced operation, the speakers connect to terminals
5, 6,
or 7,
depending on the output desired, and terminal 8.
TB101
is for the input connections. When the optional
3A230
Input Transformer is not used,
jumpers between terminals 4 and 7 and between terminals 5 and 6 of the octal socket must
be
in
place.
When the
3A230
is to be used for a balanced input, remove the jumpers and plug the
3A230
into the octal socket. Make external output connections to terminal strip
TS1,
as required for your
particular application.
I
Figure 2-2.
1A2250
Rear Panel View
2-2
