Heathkit HD 8999 Schematic

Page 1

MAIN CIRCUIT 3mm:

GNP ENABLE

I DISPLAY CIRCUIT BOARD

vzou V202 v20: V204
all-um CIF'I «1-HT «HM

E...

SOHEMATIC OF THE
HEATHKIT®
MODEL HD-8999
ULTRA PRO
CW KEYBOARD

NOTES:

1. PARTS ARE NUMBERED IN THE FOLLOWING GROUPS:

1-99 PARTS ON THE MAIN CIRCUIT BOARD.
101-199 PARTS ON THE CHASSIS.
201-299 PARTS ON THE DISPLAY CIRCUIT BOARD.

Z. ALL RESISTORS ARE RATED AT Ill-WATT AND HAVE A TOLERANCE
0F 5i. RESISTOR VALUES ARE IN OHMS (KIIDODI.

3. ALL CAPACITOR VALUES ARE IN MICROFARADS.
THIS SYMBOL INDICATES CIRCUIT BOARD GROUND.

5. EL THIS SYMBOL INDICATES CHASSIS GROUND.
0 THIS SYMBOL WITH A LETTER IN IT INDICATES A WIRE
CONNECTED To A CIRCUIT BOARD HOLE.

1. 9>-THI5 SYMBOL INDICATES A PLUG-IN CONNECTION.

a. OTHIS SVMBOL INDICATES A Dc VOLTAGE TAKEN WITH A
HIGH INPUT IMPEDANCE VTVM FROM THE POINT
INDICATED To CHASSIS GROUND (ALL VOLTAGES
ARE 2 201.).

9. cTHIS SYMBOL INDICATES A COMPONENT DRAWN

WITHIN THE CIRCUIT BOARD OUTLINE THAT Is
pm 5954941 ACTUALLY MOUNTED ON THE CHASSIS.

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