Scott R 306 307 307L A 406 407 Service Manual

Page 2

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------ N OTICE------

The following safety precautions must be followed.to assure continued
reliability and safety against fire and shock hazard:

1.) Replacement parts used during servicing of this appliance must
have identical characteristics as those offered and recommended
by H. H. Scott, Inc.

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

EXAMPLES:
a) Braided glass tubing over resistors.
b) Heatsinks on transistors.
c) Ceramic 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 re-assembly and before returning the unit to the customer.

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

1.) A dielectric tester designed to supply not less than 1100 volts
at 60 Hz and employing leakage current indicator/s is to be used.

2.) The tester 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 tester supply to
stabilize and then the output voltage is adjusted for
1080 volts.

c) Leads of the tester, usually marked GND and HV, are
connected between chassis GND and both blades of the
male plug of the power cord.

d) Switch tester to "test" and observe leakage indicator.
LEAKAGE CURRENT MUST NOT EXCEED 0.5 mA.

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

COPYRIGHT H.H. SCOTT ELECTRONICS®
Printed in USA 9/77 029-1 175037

H. H. Scott Electronics is a registered
trademark of H. H Scott, Inc.

Page 5

DIAL CORD STRINGING INSTRUCTIONS-R307

1.) With rear of unit facing you, turn front end drum all the way to
the right. (plates open)

2.) Form fixed loop on one end of dial cord and attach to tab at
inside top of front end drum.

3.) Bring dial cord through slot and follow arrows to pulley "A",
"B", llcll and "D"-

4.) Wrap cord 3 full turns around flywheel capstan, counterclockwise,
and return to front end drum.

5.) Wind cord 2% turns around drum, clockwise, and attach to spring
end protruding through slot in drum.

6.) Attach pointer to dial cord at tabs. Rotate tuning knob for
satisfactory pointer travel and dial cord action. A drop of
suitable glue on pointer tabs will prevent slipping of pointer.

-_ _-
r a;

FLYWHEEL
CAPSTAN

FRONT END
DRUM