Heathkit IM 5225 Schematic

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Extracted text from Heathkit IM 5225 Schematic (Ocr-read)

Page 1

SCHEMATIC or THE
.. HEATHKIT®

, , FET MULTIMETER

,I MODEL IM/SM-5225

SWIOI I ____________________ L ______________________ [J ________________________ .1 ____________________ .I _____________ J ______________ L ____________ J ............. .I

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CHASSIS PARTS 1-99: CIRCUIT BOARD PARTS 101-199,
RESISTOR VALUES ARE IN OHMS (K-l,000; M-l,DOD.ODO).
RESISTORS ARE l/2-WATT, 11- UNLESS OTHERWISE NOTED.
CAPACITORS ARE IN uF UNLESS OTHERWISE NOTED.
SCHEMATIC SYMBOLS:

O INDICATES SWITCH LUG CONNECTION.

INDICATES WIRE CONNECTION TO THE CIRCUIT
BOARD.

V INDICATES CIRCUIT GROUND IPOWER).
V INDICATES LOW-NOISE GROUND.
ITI'I INDICATES CHASSIS (EARTH) GROUND,

INDICATES DC VOLTAGE READING USING A HIGH
IMPEDANCE (IDMQ OR HIGHER) VOLTMETER FROM
THE "- INPUT JACK TO THE MEASUREMENT POINT.
VOLTAGES MAY VARY 120%.

RANGE SWITCH IS SET TO THE ILLUSTRATED
POSITION; FUNCTION SWITCH IS IN DC/Q
POSITION.

ARROW INDICATES CLOCKWISE ROTATION OF
CONTROL AS VIEWED FROM KNOB END.

. INDICATES FRONT PANEL CONTROL.
* INDICATES MYLAR CAPACITOR.
NC MEANS NO CONNECTION.

6. PARTS IN SHADED AREAS ARE CRITICAL FOR
CONTINUED SAFETV. REPLACE ONLY WITH HEATH
COMPANY PART.

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7. REFER TO THE "CIRCUIT BOARD X-RAY VIEW" FOR
LOCATION OF PARTS.

SWITCH (SWIDI) WAFERS ARE VIEWED FROM FRONT
(KNOB) END OF SWITCH. "." ON WAFER INDICATES
ELECTRICAL THROUGH-CONNECTION FROM FRONT
SIDE T0 REAR SIDE AT A LUG OR ROTOR.

9, F8 INDICATES FERRITE DEAD.

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