Scott A417 437 457 Service Manual

Page 1

SERVICE MANUAL
stereo components

Ml]? A? MW

W SCOTT

The Name to listen to.
H. H. SCUI l. INC, 20 Commerce Way. Wnlmm, Mam: 0801 lrl

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------NOTICB ------

The following safety precautions must be (allowed to esaure continued

reliability end safety against fire and shock hazard:

1.) Replacement parts used during servicing of this appliance least
have identical characteristics as those offered and recomended
by ll. R. Scott, Inc.

2.) Satisfactory and approved service procedures dictate that Au. PARTS,
no matter how apparently unimportant, be replaced exactly as in the
original design.

EXAMPLES:
e) Braided glass tubing over resistors.
b) Heateinks on transistors.
c) Cerenic tube spacers.
d) All mechanical parts, i.e. covers, brackets. screws etc.

3.) A dielectric test is to be performed on each appliance following
the reassembly and before returning the unit to the customer.

4.) The dielectric test, to be performed on E. ii. Scott, Inc.
electronic components serviced in the U. S. and Canada for use in
these countries. shall consist of not less than the Eolloving:*

l.) A dielectric teeter designed ~to supply not less than 1100 volts
at 60 Hz end employing leakage current indicator/a ie to be used.

2.) The teeter is to be connected per the instructions enclosed
with the instrument, or as follows:

a) The tester is connected to the power line receptacle,
and the power switch is turned on.

b) Sufficient time is allowed for the teeter supply to
stabilize and then the output voltage is adjusted for
1080 volts.

c) Leeds of the tester, usually marked (BID and RV. are
connected between chassis am and both blades of the
male plug of the power cord.

d) Switch tester to "test" and observe leakage indicator.
LEAKAGE CURRENT HIST NOT 3X63. 0.5 M.

* Dielectric teats made by service personnel in countries other than
United States and Canada mt use test equipment and procedures
specified by the safety agency serving that country.