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Power Transformer Connections
5.78
The transformer has a series/parallel primary. Conversion from 230V a. c.
working to 115V a. c. working requires modification to the internal wiring,
as follows:-
9057/9059
230V a.c. Operation
Primary
Connection
A •••
B
&
C.
D •••
Component
• • • mains fuse tag
to Pin 7 of p.c.b.
to neutral mains
socket
115V a. c. Operation
Primary
Connection
A & C ••
Component
mains fuse tag
and Pin 7 of p. c. b.
B
&
D . • • . • • to neutral mains
socket
5-12
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