This is the 3 pages manual for Heathkit HD 1420 Schematic.
Read or download the pdf for free.
If you want to contribute, please mail your pdfs to info@audioservicemanuals.com.
: CIRCUIT BOARD
REDQ
mm V
Ala-on «A I
ILK
an e
i
w swm .
I
U
I
I
=' I
IYIOI- I
iv. 1
YIOI
3.5MHl '
0102
4I7-ns
Q103
417-1..
WIN
R [0! L I01 L1 02
40-203 lO-ZIMS IO
CD
+1..."
Zzul
'3'
mm
:3
z|® : ® 5 ®
@u ,® 35o
CHE
g .l
U10l
m I
Ana-90 22;
s ®
1 0 lo
@ 3+2 ® 37
Ru:
3300
Vw
an:
41
ll
l'l
ma:
loco
BR"
6 -u-II-llIan-.--nun-In-..---u-¢|n---I-
;:CIIlI
r---
HEATHKIT
VLF CONVERTER
MODEL HD-1420
NOTES:
1.
N
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.
O
6.
5.
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.
(Shown from the component side.)
P399 2
Heathkita
SEMICONDUCTOR IDENTIFICATION
HEATH MAY BE
COMPONENT PART REPLACED KEY
NUMBER NUMBER WITH NUMBER
DIODE
D101 412-633 5082-4484 A1
TRANSISTORS
0102 417-169 MPF105 A2
0103 417-875 2N3904 A3
INTEGRATED CIRCUIT
U101 442-96 MC14966 A4
F L A T o a
N O T C H Ex
CATHODE C
(SHORTER LEAD) 8