Heathkit HD 4040 Schematic

Page 1

SCHEMATIC OF THE
HEATHKITD
TERMINAL NODE CONTROLLER
MODEL HD4040

NOTES:

1.

10

11.

12

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ALL RESISTORS ARE II4-WATT. 5% AND ARE MARKED IN OHMS
(k'1.000: M-I.000.000).

ALL CAPACITORS ARE IN E (MICROFARADS) UNLESS STATED OTHERWISE.

O INDICATES A WIRE CONNECTION ON THE CIRCUIT BOARD.
=2.- INDICATES CHASSIS GROUND.

INDICATES CIRCUIT BOARD GROUND.

INDICATES A FEMALE (SOCKET) CONNECTION.

INDICATES A MALE (PLUG) CONNECTION.

INDICATES A CONNECTION POINT.

INDICATES A NO CONNECTION POINT.

. JO-T INDICATES SOCKET AND PIN NUMBER.

NUMBERS SUCH AS (1) OR 8 NEXT TO A COMPONENT INDICATES A
PIN NUMBER.

X- use 15 PIN PLUG.

- *X- U34 1: PIN PLuo.

{XX - us; 14 PIN PLUG.

PARTS IN SHADED AREAS IN THE POWER SUPPLY'S PRIMARY CIRCUIT
ARE CRITICAL FOR CONTINUED SAFETY. REPLACE THEM ONLY WITH
PARTS OF THE SAME RATING OR WITH THE PROPER HEATH PARTS.

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Page 2

SCHEMATIC OF THE
HEATHKIT"
TERMINAL NODE CONTROLLER
MODEL HD4040

NOTES:

1.

10

11.

12

ALL RESISTORS ARE 1/4-WATT. 5% AND ARE MARKED IN OHMS
(k-1.°°O: M-I.OO0.000).

ALL CAPACITORS ARE IN uF (MICROFARADS) UNLESS STATED OTHERWISE.
O INDICATES A WIRE CONNECTION ON THE CIRCUIT BOARD.
:L- INDICATES CHASSIS GROUND.

INDICATES CIRCUIT BOARD GROUND.

'
- I
V I
I
>- INOICATEs A FEMALE (SOCKET) CONNECTION. I
,n -
9 INOICATEs A MALE (PLUG) CONNECTION. : IM
I
+ INOICATEs A CONNECTION POINT. I a m w:
I OI Paw-43m
+ INDICATES A NO CONNECTION POINT. I n n
I W "' %- i .931
Al
- J6-1 INDICATES SOCKET AND PIN NUMOER. I :2 V m I I. «was
i u m n___n.. NOVIIAM
NUMBERS SUCH A8 (1) OR 3 NEXT TO A COMPONENT INDICATES A I " A. ~ I»
PIN NUMEER. I I. m I:
' M N 9 3'
X- uao IO PIN PLUO. : n I» 7 3..
- Xi- U34 10 PIN PLUO. , 3 2;": Q:
X - us: 14 PIN PLUO. I ,., 3 °' 1 5
I .w ~' ta 1&3}:
PARTC IN sI-IAOEO AREAs IN THE POWER SUPPLY'S PRIMARY CIRCUIT . I. . f g: .,
ARE CRITICAL FOR CONTINUED SAFETY. REPLACE TNEM ONLY WITH I I so {a a. .
PARTS OF THE SAME RATINO OR WITH THE PROPER HEATH PARTs. I m .51?
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