Heathkit IM 1202 Schematic

Page 3

BINARY DECODER AND OUTPUT

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NOTES:
I CEPT FOR SOLID STATE DEVICES AND SWITCHES, COMPONENTS
ARE NUMBERED IN THE FOLLOWING GROUPS.
MAIN CIRCUIT BOARD 1er
LOGIC CIRCUIT BOARD 201-299
2. RANGE SWITCH IS REFERRED TO AS RS".

FUNCTION SWITCH IS REFERRED TO AS F5".

4 SWITCH WATERS ARE REFERRED TO As "DECK 1, DECK 2. DECK 3
AND DECK A" F" AND R" ARE FRONT AND REAR RESPECTIVELT.
As VIEWED FROM THE SHAFT END OF THE SWITCH

5. F5 AND R5 ARE SHOWN IN THE COUNTERCLOCKWISE POSITION.

6. PS, THE POLARITV SWITCH, Is SHOWN IN THE A POSITION.

SYMBOLS AND THEIR MEANINGS FOLLOW:
v CIRCUIT BOARD GROUND.

CHASSIS GROUND,

n) An
MA: on
MAIN new:

0 POSITIVE DC VOLTAGE.
O NEGATIVE Dc VOLTAGE.
E] CIRCUIT TOARD HOLE.

* FACTORV SELECTED COMPONENTS.

a. Vch 5 VOLTS DC IRDMINALI.

9. RESISTOR VALUES ARE GIVEN IN UHMS TI<=IDOD M=I.uuo.uooy.
ALL RESISTORS ARE IIA WATT, 105 TOLERANCE UNLESS MARKED
OTHERWISE

III. ALL CAPACITOR VALUES I AND OVER ARE IN pF UNLESS MARKED
OTHERWISE, CAPACITOR VALUES LESS TIIAN I ARE IN uF.

IT. FOR ADDITIONAL INFORMATION ON SOLID STATE DEVICES, REFER
To THE TRANSISTOR~INTECRATED CIRCUIT CHARTS" 0N PAGES 62
AND 63.

12. REFER TO THE XVRAV VIEWS AND CHASSIS PHOTOGRAPHS"
FOR THE PNVSICAL LOCATION OF PARTS.

13, ARRDws OUTSIDE CIRCUIT BOARD LINES PD|NT DIRECTLV

TOWARD THEIR RESPECTIVE LOCATIONS AT OTHER POINTS
ON THE SCHEMHIC.