Fisher CA 550 Service Manual

Page 1

SERVICE MANUAL

Integrated Stereo -
DC Amplifier

The first name in high fidelizy

Page 2

CONTENTS

Functional Block Diagram ............................................... 2
Specifications ....................................................... 3
Cabinet & Chassis Exploded View .......................................... 4
Parts List ........................................................... 5
Recommended Test Equipments ............................................ 6
Harmonic Distortion Test ............................................... 6
Adjustment of Power Amplifier P.C.Board .................................... 7
Power Amp Board Layout ................................................ 7
Explanation of Protective Circuits .......................................... 8
Level Ind, P.C.Board Layout ............................................... 8
Adjustment of Power Level Ind. P.C.Board ..................................... 8
10 Equivalent Circuit & Block Diagram ...................................... 9,10
Pre Amplifier P.C.Board ............................................... 11,12
Function P.C.Board ................................................... 11
Phone/Tape Select P.C.Board ............................................. 12
Main, E0, Power Supply PC.Board ...................................... 13,14
Level Ind. P.C.Board ................................................... 15
LED. P.CBoard ..................................................... 15
MM/MC Select P.C.Board ................................................ 16
Headphone Jack P.C.Board ............................................... 16
Volume Control P.CBoard ............................................... 16
RCA Pin/DIN P.C.Board ................................................. 17
Fuse P.CBoard ...................................................... 17
Parts List ...................................................... 18,1920
Point to Point Wiring Diagram ........................................... 21,22
Schematic Diagram ................................................. 23,24
Semiconductor Lead Identification ......................................... 25

FUNCTIONAL BLOCK DIAGRAM

MC Amp
PHOND
MC @-
E0 Arno
MM 1-
PHONO CTION P E A
FUN R "111
SELECTOR sw, MASTER
RECOUT VR
SELECTOR
PRE Amvt 1C OUT IN
mun
TUNER © "-" BALANCE
@E : VR
AUX
-VW- HIGH
TAPEI P/a©-_._-Z EASS TREBLE FMER
LOUDNESS
TAPE2 Pra©h._-/_ sw, TONE CONTROL
LEVEL
M
TA IND.
PEI Rm POWER Amp. -.

SUB SONIC
FILTER

IC STK 82801]

LED METER Amp.

PROTECTOR
CIRCUIT

SPEA KE R
SYSTEM