Heathkit AJ 14 Schematic 2

Page 1

PM TUNING

UNI

T

G

ANTENNA
ONNECTOR

SCHEMATIC OFmTHE
HEATHKIT
SOLID STATE FM STEREO TUNER

MODEL AJ-l4

I05-I25 VAC.
50/60 CPS

NOTES:

ALL RESISTORS ARE 1,4 wATT UNLESS MARKED OTHERWISE.

ALL RESISTOR VALUES ARE IN OHMS II: = Iooo, MEG 1.000.000.

ALL CAPACITOR VALUES ARE IN IId UNLESS MARKED OTHERWISE.

C) INDICATES VOLTAGE READING.

ALL VOLTAGES ARE DC POSITIVE UNLESS MARKED OTHERwISE.

ALL VOLTAGES ARE MEASURED FROM POINT INDICATED To CHASSIS
GROUND.

VOLTAGE READINGS TAKEN WITH AN II MEooHM INPUT VTVM.

VOLTAGES MAY VARY 220%.

MEASUREMENTS MADE WITHOUT ANTENNA CONNECTED. szTCI-I
52 AT STEREO pOSITIoN, AND PHASE SWITCH PUSHED IN.

@INDICATES TEST POINTS.

0 INDICATES CONNECTING POINTS ON CIRCUIT BOARD.

REFER TO THE X-RAY VIEW FOR THE PHYEAICRL LOCATION
OF PARTS.

LETTER-NUMBER DESIGNATION!) FOR COMPONENTS ARE AS FOLLOWS:

I - 99 FM TWING UNIT
I00 - I99 IF CIRCUIT
zoo - 299 FM STEREO MULTIPLEX CIRCUIT
300 ~ 399 POWER SUPPLY

242le TRINSISTORS: O! THROWH OI3 HAVE AN ORANGE DOT IND

OM HAS A BLUE DOT.

Q3

25A239

@R EQUIVALENT)

LOCAL OSCILLATOR

1/6

AMPERE OFF TO
FU SE
0.

:)

SI

I
|
I OI a2
25A24o 25A240
| n ©2523I:::::*> (on w> r2
MIXER
\l
(Ill I I (3. II
1 I I 5.6 II
| I cu cr __c2 I: II
I I I \6-8 L3 I:
Q I - I I PM I
I = I I / a II
2 I
soon /
I / =
I /
/ 92 AGC
- ""-7--"- 2700
/
/
/
/ no '-
/
// *
c2;
// 2: cs 02::
02
/ ".7 _.
/ -
/
/ cm 95
/ 3 W,-
/ _I5 IOK
// I
T- - fl - DI (20

{K}
E
II
n

0N ®

1
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

r-----------

BL K-YEL®

240 VAC WIRING

------------------J

-------------J