Free Audio Service Manuals - Free download Heathkit HD 1420 Schematic

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HEATHKIT
VLF CONVERTER
MODEL HD-1420

NOTES:

All resistors are rated at 1l4-wa11, and have a 5%
tolerance unless otherwise nailed (K . 1000].

Capanitor values less than 1 we in F (microfarads):
mm 1 or greater ale in pF (pioutarads). unless
chemise ruled.

The following symbols am used on Ibis schematic
diagram:

----------n-n-n-ncunnnun-apnnnnuun-ICUIIn---_______n--------_--__-___-----------------nun-nun...

SCHEMATIC OF THE

Circuit board gmnd.

Chassis ground.

DC voltage reading taken wilh a high input im-

_l_ Clrwﬂ board wim com-section.
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pedance voltmeler from the point indium to
chassis ground. Voltages may vary 2 1096

Switch SW1 is shown in [he on'posilion.

Rafe! lo me "Cirwil Board X+Ray Vlaw on Manual
Page 23 for lhe physical localions of parts.

Heathkit HD 1420 Schematic