Fisher RS 120 Service Manual
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Extracted text from Fisher RS 120 Service Manual (Ocr-read)
Page 1
SERVICE MANUAL-
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Page 2
SPECIFICATIONS
AMPLIFIER SECTION
FTC power 8 ohms load
Power bandwidth
Rated maximum T.H.D. at 8 ohms load
Frequency response
Phono (Diviation from RIAA curve.
20 ~ 20000 HZ)
Aux/Tape (+0. -1dB) --
Phono sensitivity/Overload
Aux. Tape sensitivity/Impedance
Graphic Equalizer 50Hz~~
250 Hz
1 k Hz
4.5 kHz
15 k Hz ~~
20 W/Ch.
20 ~ 20000 Hz
0.09 %
i0.8 dB
10 ~ 30000 HZ
2.5/130 mV
150 mV/47 k ohm
i 10 dB
$10 dB
:10 dB
:I:10 dB
:10 dB
Loudness compensation (volume at -30dB) ~~~~~~~
100 H2
10 k Hz
+8dB
-+3dB
Signal-to-Noise ratio (IHF A filter)
Phono -
Aux/ Tape
TUNER SECTION
FM
FM Frequency Range .......
Usable sensitivity (lHF)
-70dB
~90dB
87.5 ~ 108 MHZ
2.0 #V/11.2 dBf
TUNER SECTION
FM
Ultimate Signal-to-Noise ratio
Mono-~-
Stereo
Total Harmonic Distortion at lkHz.
Mono
Stereo
Capture ratio
Alternate channel selectivity
Spurious response rejection
Image rejection
IF rejectionw
AM rejection
Stereo separation at lkHz
AM
MW Frequency Range
Sensitivity (lHF)~
Selectivity
Signal-to-Noise ratio
Image rejection
lF rejection-
GENERAL
Power Source ........................
~ 520 ~ 1640 kHz
~400/1V/m
N 35 dB
~45 dB
....................... AC 120V, 60HZ
NOTE 1 Specifications are subject to change without prior notice.
ALIGNMENT PROCEDURES
AM ALIGNMENT INSTRUMENTS
AM IF Sweep Generator. AM RF Signal Generator. VTVM. and Oscilloscope.
Place the controls and switches in the following positions unless otherwise instructed.
NOTE
Function ............ AM
Tape Monitor-~--Source
Volume--
0 (minimum)
Treble. Bass--~~0 (center)
Balance
Speakers ~~~~~~~~~ A position where a pair of test speakers are connected.
Keep the input signal level as low as possible to avoid the AVG action.
AM IF ALIGNMENT
0 (center)
Loudness. High and Low Filters----OFF (outer position)
Step Generator Connection Input Signal ggfiaeifigfiment Adjustment
Sweep generator Tune T3.4 for highest and
1. to J5. 455 kHz Oscilloscope to TP5. most symmetrical IF response.
See Figure 1.
Figure 1.
AM SIGNAL STRENGTH METER ADJUSTMENT
Symmetrical Curve
/ 455 kHz marker
Step Generator Connection Input Signal 523% Dial Egzaegqitgtpment Adjustment
1.000 kHz Adjust SVR3 for lighting of
1. Loop Ant. lkHZ. 30%mod. 1.000 kHz 5 LEDs in the Signal
15 mV/m Strength Indicator.