Printed circuits are more difficult to work with - but not impossible The foil can be cut and small
sections removed to isolate one circuit from the following one - you need only a sharp knife or a
single-edged razor blade If you make a mistake the cut connections can be repaired Just solder a
thin piece of copper wire across the cut in the foil.
If you are not certain where the best point to connect the is write Richard Hamilton, Customer
Relations Department, Fisher Radio Corporation, Long Island City, New York, 11101, You must
include a schematic diagram of your unit .It will be returned with the proper connections
indicated
Transistor stereo channel has similar signal path that is completed by jumper until Spacexpander
is connected .
PRECAUTIONS
• Disconnect line cord from wall outlet before starting work on circuit modifications
• Remove all input and output cables connected to the chassis before working on circuit
modifications
• Never cut the pig-tail leads of components when there is another way of breaking the signal
path
• Never cut the pig-tail leads close to the body of the component.
• Double-check before you cut any conductor -either insulated wire or copper foil.
• Make clean, neat connections- any frayed ends of wire or lumps of solder may cause intermittent
or permanent short circuits
• A low-heat soldering iron may not transfer heat fast enough to make good solder points- heat
conduction along the leads of components make heat sinks a necessity,
• Never use anything but rosin-core solder for connections.
• A too-hot soldering iron can ruin plastic parts of sockets and plugs, transistors and other
components as well as printed circuit boards.
WARNING: Transistors, printed circuitry and miniature components must be handled with
extreme care. DO NOT attempt any modifications to high-fidelity instruments using this type of
construction unless you have had previous experience. It takes only a second or two to damage
expensive circuit components.
