Heathkit AP 1800 Schematic

Page 1

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NOTES:

1. COMPONENTS ARE IN THE FOLLOWING GROUP NUMBERS:

n
1-99 PARTS 0N CHASSIS AND INPUT SELECTOR was: 25':
CIRCUIT BOARD. I
lgL-gDD-PARFS-ON-MUVTNGCUTTFREAMPLIHER-C I RCUIT ,,
.JHi BOARD
201-400 PARTS 0N MAIN CIRCUIT BOARD
401-500 PARTS ON MODE SWITCH CIRCUIT BOARD
501-600 PARTS 0N CONTROL CIRCUIT BOARD
601-700 PARIS ON SPEAKER SELECTOR CIRCUIT BOARD
701-800 PARTS ON POWER SUPPLY CIRCUIT BOARD

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2. ALL RESISTORS ARE 1/4-WATT, 51- TOLERANCE UNLESS MARKED
OTHERWISE. RESISTOR VALUES ARE IN OHMS IK-lDOO,
M-1.000.000I.

3. ALL CAPACITOR VALUES LESS THAN 1 ARE IN LIF AND ALL

CAPACITOR VALUES GREATER THAN 1 ARE IN pF UNLESS MARKED
OTHERWISE.

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4. SWITCHES ARE SHOWN WITH THE PREAMPLIFIER IN THE PHONO I: EL 1;
M.C., STEREO MODE OF OPERATION. '

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5. DC VOLTAGE MEASUREMENTS WERE TAKEN WITH A HIGH IMPEDANCE
INPUT VOLTMETER FROM THE POINT INDICATED TO CHASSIS
GROUND. VOLTAGES MAY VARY tZOA. LINE VOLTAGE WAS
120 VAC. 60 Hz.

6. ALL VOLTAGE MEASUREMENTS WERE MADE UNDER NO SIGNAL
CONDITIONS.

7. 0 THIS SYMBOL INDICATES A DC VOLTAGE.

8. 6 THIS SYMBOL INDICATES A CIRCUIT BOARD GROUND.

9. '31:- THIS SYMBOL INDICATES A CHASSIS GROUND.

10. * THIS SYMBOL INDICATES A GROUND INDEPENDENT OF E
V om GROUNDS. SCHEMATIC or TH

®
11. -< THIS SYMBOL WITH A NUMBER INDICATES A CONNECTOR
éPLUG AND PIN CONNECTION. FOR EXAMPLE: P504-6 HEATHKIT

INDICATES PLUG P504, PIN a. MODEL AP-1800
12. * BUILDERS SELECTED VALUES. DELUXE PREAMPLIFIER

13. BALANCE CONTROLWITH WIPER IN BOXED AREA
THERE IS NO SIGNAL LOSS.

14. PARTS IN SHADED AREAS ARE CRITICAL FOR CONTINUED '
SAFETY. REPLACE THEM ONLY WITH PARTS OF THE SAME
RATING OR WITH THE PROPER HEATH PARTS.