Heathkit HD 1982 Schematic 2
This is the 1 pages manual for Heathkit HD 1982 Schematic 2.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.
Extracted text from Heathkit HD 1982 Schematic 2 (Ocr-read)
Page 1
WAVEFORMS
CIRCUIT BOARD *1
9V
+ II - 65: r " ,
J) SWIOI I 1
M T
TRANS.4-> REC.
$525)
.__.@ .q 15? ®
3 Low TONE 11,
OSCILLATOR
I fill?
an
mu
Ian
3 MICROPHONE
CONTROL
CIRCUIT
AUDIO
GROUND
'ch Em
$ Ia gm
ICIOZ
r--_--_--_--------.---.----..-.....--------------..--_.-.------'
44253®¢N N 1
HIGH TONE : 0 ES
OSCILLATOR ,
I I. REFER 10 THE "CIRCUIT BOARD x»RAY VIEWS" FOR THE
W : PHYSICAL LOCATION or PARTS.
I
W : 2 PRECISION RESISTDRS AR: 118 Mn, 17- TOLERANCE.
I REMAINING RESISTORS ARE 1/4 WATT, 10$ IOLERANCE.
: RESISTOR vALuEs ARE IN OHMS (-1000, M-IDOMODL
l
I 3. CAPACITOR VALUES ARE IN NF.
___________________________________________ _--_--.-------------------J
4. DC VOLTAGE MEASUREMENTS WERE TAKEN WITH A HIGH
INPUT IMPEDANCE VOLTMETER FROM THE POINT INDICATED
SCHEMATIC OF THE T0 CIRCUIT BOARD GROUND. VOLIAOEs MAv VARv 210$.
HEATHKIT) 5, O THIS'SVMBOL INDICATES A Dc VOLTAGE WITH NO
TONE BEING PRODUCED,BUT PTT SWITCH swm DEPRESSED.
MICODER'"
o - 6. :1 THIS SYMBOL INDICATES A no VOLTAGE WITH KEY
EC n WWII. MODEL HD'1982 "1" PUSHED AND 911 SWITCH swm DEPREssED,
5 Yum/NM was ms Im
W . 2 3 comm©m 7 V THIS SYMBOL INDICATES CIRCUIT BOARD GROUND.
no I s s mm
In... suonvzo :33 I g : Allklghtshuorved a. 0 THIS SVMBOL INDICATES A CONNECTION TO THE CIRCUIT
42,533 MW '5 immune amp,
mum .. N cm or Ransom pms mwmmmousmmwMmmw
9. THE WAVEFORMS SHOWN WERE OBTAINED av PUSHING
KEY "1" WITH PTT SWITCH SWIM DEPRESSED,