Fisher RS 270 Service Manual
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Extracted text from Fisher RS 270 Service Manual (Ocr-read)
Page 1
NOTE:
The phone on the cover shows the unit with a
BRUSHED ALUMINUM" front panel. The
"BLACK" version is identical in all respects.
The first name in high fidelity
Page 2
CONTENTS
Specifications ............................................................. 2,3
Functional Block Diagram ...................................................... 4
Cabinet 8:. Chassis Exploded View ................................................. 5
Parts List ................................................................. 6
Semiconductor Lead Identification ............................................... 7,8
IC Signal Flow ........................................................ 9,10,11,12
Power Amplifier Adjustment ................................................. 12,13
Power Level Meter Adjustment .................................................. 13
Harmonic Distortion Test ............................ . 14
AM/FM Tuner Alignment ............................. i ....................... 15,16
R F Control P.C.Board Layout ................................................. 17,18
Printed Circuit Board .............................................. 192021222324
25,26,27 28,29,130
Parts List ...................................................... 31,32,33,34,35,36
Point to Point Wiring Diagram ................................................. 37,38
Schematic Diagram .................................................... 39,40,41,42
Front End Schematic Diagram .................................................. 43
SPECIFICATIONS
RECEIVER RS-270
FM SECTION
Tuning Range 87.5 - 108 MHz
DIN Sensitivity (75 ohms) Mono 1.8 uV
Stereo Trigger Sensitivity 8.0 1.1V
Muting Threshold 8.0 ml
S/N Ratio (DIN) Mono 75 dB
Stereo 70 dB
Selectivity (DIN) 70 dB
Capture Ratio 08 dB
AM Suppression 55 dB
Spurious Rejection >85 dB
IF Rejection 100 dB
Image Rejection 70 dB
Sub-Carrier Suppression (19/38 kHz) 65/70 o B
THD (1 kHz) Mono 03%
Stereo 04 %
Frequency Response (20 Hz -- 15 kHz) :05 dB
Stereo Separation (1 kHz) 50 dB