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What are the nominal specifications for the FISHER RS-2004A Stereo Receiver?
| RECEIVER | RS-2004A | |
|---|---|---|
| POWER AMPLIFIER SECTION | ||
| Continuous RMS is sine wave power per channel within stated bandwidth at no more than stated distortion and with an 8 ohm load. | 45 W | |
| Power Bandwidth | 20 Hz/20 kHz | |
| Total Harmonic Distortion at Rated Power | 0.09% | |
| I.M. Distortion | 0.09% | |
| PREAMPLIFIER SECTION | ||
| Input sensitivity and Impedance at rated output 8-ohms at 1 kHz | ||
| Phono | 2 mV/50k ohm | |
| Auxiliary | 150 mV/100k ohm | |
| Tape Monitor | 150 mV/100k ohm | |
| Hum & Noise (below rated output) | ||
| Phono | 76 dB | |
| Auxiliary | 90 dB | |
| Tape Monitor | 90 dB | |
| Frequency Response | ||
| Phono (RIAA EQUALIZED ±1 dB) | 30 Hz – 15 kHz | |
| Auxiliary input ±1 dB | 20 Hz – 20 kHz | |
| Tone Control (GRAPHIC EQUALIZER) | 50 Hz | ±10 dB |
| 250 Hz | ±10 dB | |
| 1 kHz | ±10 dB | |
| 4.5 kHz | ±10 dB | |
| 15 kHz | ±10 dB | |
| FM TUNER SECTION | ||
| Usable Sensitivity | Mono | 1.9 µV/10.8 dBf |
| Stereo | 4.6 µV/18.5 dBf | |
| 50 dB Quieting Sensitivity | Mono | 2.8 µV/14.2 dBf |
| Stereo | 38 µV/36.8 dBf | |
| Signal-to-Noise Ratio | Mono | 70 dB |
| Stereo | 66 dB | |
| Capture Ratio | 1.0 dB | |
| Alt Channel Selectivity (±400 kHz) | 68 dB | |
| Image Response Ratio | 56 dB | |
| Spurious Response Ratio | 85 dB | |
| AM Suppression Ratio | 55 dB | |
| Signal-to-Noise Ratio (Mono/Stereo) | 70/66 dB | |
| Total Harm. Distortion (Mono/Stereo) at 65 dBf | 0.3/0.4% | |
| T.H.D. at 50 dB Quieting Sensitivity | Mono | 0.4% |
| Stereo | 0.5% | |
| Stereo Separation (1 kHz/10 kHz) | 45/35 dB | |
| Sub-Carrier Suppression (19/38 kHz) | 65/70 dB | |
| AM TUNER SECTION | ||
| Usable Sensitivity | 300 µV/m | |
| Selectivity (±10 kHz) | 40 dB | |
| Signal-to-Noise Ratio | 55 dB | |
| Image Response Ratio | 50 dB | |
| IF Response Ratio | 45 dB | |
| GENERAL SECTION | ||
| Power Requirements (50/60 Hz) | 110/220 V AC ±10% | |
| Power Consumption | 210 W/260 VA | |
| Dimensions W x D x H | (Inches) | 5-7/8″ x 19-1/4″ x 14-7/8″ |
| Weight | (lbs.) | 28.5 |
What test equipment is required to test and align the FISHER RS-2004A?
The following test equipment is required to completely test and align the Receiver:
• Line Voltage Isolation Transformer
• AC DC Multimeter
• Accurately Calibrated AC Voltmeter
• Oscilloscope (Flat to 100 kHz Minimum)
• Low-Distortion Audio Sine-Wave Generator
• Harmonic Distortion Analyzer
• Two (2) Load Resistors, 8-ohms, 250 Watts (Minimum Rating)
• Low-Distortion AM-FM Signal Generator
• 10.7 MHz Sweep Generator
• Multiplex Generator
• 455 kHz Sweep Generator
How do I perform a harmonic distortion test on the FISHER RS-2004A?
CAUTION: Limit the following tests to no more than ten minutes each. Use 8-ohm resistors with a minimum power rating of 250 watts when connecting a load across the SPEAKERS terminals.
CONTROL SETTINGS:
POWER switch to OFF
GRAPHIC EQUALIZER switch to OFF
TAPE MONITOR to SOURCE
LOUDNESS CONTOUR switch to OFF
VOLUME control to MINIMUM position
BALANCE control fully to LEFT position
FUNCTION switch to AUX
LEFT CHANNEL DRIVEN
ONE CHANNEL DRIVEN:
1) Connect a low distortion audio generator to LEFT AUX IN jack. Set generator frequency to 1 kHz and output to minimum.
2) Connect an 8-ohm load resistor between SPEAKERS MAIN LEFT and COM terminals. Connect a Harmonic Distortion analyzer and an AC VTVM in parallel across the 8-ohm load.
3) Connect the AC power cord and set SPEAKERS switch to MAIN. Turn VOLUME control to MAX.
4) Increase generator output for 45W RMS (18.9V across the 8-ohm load). Harmonic Distortion Analyzer should measure 0.1% distortion or less.
5) Repeat steps 1 through 4 for RIGHT CHANNEL.
BOTH CHANNELS DRIVEN
Connect 8-ohm load resistors across LEFT and RIGHT MAIN SPEAKERS terminals. Check for distortion of 0.1% or less at 45 watts sine-wave power (18.9 volts RMS across the 8-ohm loads) on each channel with both channels driven simultaneously.
Are there any special instructions for the dial cord stringing on the FISHER RS-2004A?
When stringing the dial cord, check to see that the dial cord is correctly strung by turning the dial. An adjustment screw is available for dial cord tension.
CAUTION: This precision high-fidelity instrument should be serviced only by qualified Personnel, trained in the repair of transistor equipment and printed circuitry.
What is the procedure for FM Tuner Alignment on the FISHER RS-2004A?
For FM Alignment, set the FUNCTION switch to FM, MUTING switch to OFF, and VOLUME control to minimum. Maintain generator output as low as possible for suitable indications.
| ITEM | GENERATOR | DIAL SETTING | INDICATOR | PROCEDURE |
|---|---|---|---|---|
| NOTE: The FM IF circuit utilizes a non-turnable ceramic filter which establishes the IF bandpass. To insure symmetrical tuning and selectivity, the IF must be aligned precisely to the center of the filter bandpass, rather than to 10.7 MHz as in conventional LC circuits. | ||||
| 1. IF ALIGNMENT | Connect 10.7 MHz Sweep Generator to VC2 and, ground lead to chassis. Markers are not required. Set generator output to -12dB (250mV). | Position of non-interference. Connect jumper to pin 23 and chassis ground. | Scope vertical input to TP6, and connect ground lead to chassis. Set vertical sensitivity to 0.5V/cm. | Adjust L05 (top slug) for maximum gain and best symmetry. |
| 2. PRELIMINARY DETECTOR ALIGNMENT | Generator connections are the same as above. Adjust for S-curve display. Set generator output to -20dB (100mV). | Position of non-interference. | Scope vertical input to TP19. | Adjust IFT01 (bottom slug) for maximum gain and best linearity. Adjust IFT01 (top slug) for minimum gain and best linearity. NOTE: Harmonic Distortion test must be performed as part of detector alignment. Remove jumper from pin 23 and ground. |
| NOTE: Connect 120-ohm composition resistors in series with each lead from the RF generator to match the 50-ohm output to the 300-ohm input impedance. Generator output voltage is reduced to one-half at antenna terminals. Signal voltages specified in this table are generator output levels, not antenna voltages. | ||||
| 3. FRONT END ALIGNMENT | Tuning knob fully counterclockwise. | Center dial pointer on “0” and cement. | ||
| 4. FRONT END ALIGNMENT (90 MHz) | Connect FM generator to FM ANT terminals through 120-ohm resistors. Set to 90 MHz. Adjust output for approximately 3 on Field Strength meter. | Center of 90 MHz calibration mark on dial. | Front panel Field Strength meter (M1) and Center of Channel meter (M2). | Adjust L04, L03, L02, and L01 for maximum deflection on Field Strength meter and zero deflection of M2. Reduce generator output to keep Field Strength meter indication at approximately 3. NOTE: It is almost unnecessary to adjust L01 – 04 in Front End as perfectly adjusted. |
| 5. FRONT END ALIGNMENT (106 MHz) | Set to 106 MHz. | Center of 106 MHz calibration mark on dial. | Same as above. | Adjust TC3, TC2, and TC1 for maximum deflection on Field Strength meter (M1) and zero deflection of M2. Reduce generator output to keep Field Strength meter indication at approximately 3. Repeat steps 4 and 5 for optimum alignment. |
| 6. FINAL DETECTOR ALIGNMENT (MINIMUM THD) | Set generator to receiver frequency. Modulate with 400 Hz ±75 kHz deviation. Connect generator to FM ANT terminals. | Tune receiver to position of non-interference. | Scope vertical input to LEFT TAPE output jack. | Reduce generator output for noise to be visible on sine wave. Readjust generator frequency to center noise on positive and negative half cycles. Adjust VR01 (200k) for CENTER 0 (ZERO). NOTE: Do not change generator or receiver tuning; proceed to Item 7. |
| 7. | Same as above. Increase generator output to 2mV. | Same as above. | AC Voltmeter and Harmonic Distortion Analyzer to LEFT TAPE OUT jack. | Adjust IFT01 (bottom slug) for center of channel indication on M2. Adjust top slug for minimum THD (0.3% typically). |
| 8. PLL IC F.R.F. (76 kHz) | Same as above. | Same as above. | Connect frequency counter to TP13. NOTE: Connect Buffer Amp of a high input impedance (over 500 k-ohm) to TP13 and then, to the frequency counter through 220 k-ohm. | Adjust VR05 (5k) in Multiplex circuit to obtain 76 kHz±200 Hz on counter. |
| 9. PILOT CANCEL ADJUSTMENT | Set generator to receiver frequency. Modulate with 19 kHz ±7.5 kHz deviation (Pilot Signal). Connect generator to FM ANT terminals. | Tune receiver to Position of non-interference. | Scope vertical input to LEFT TAPE output jack. | Adjust VR04 (100k) until deviation of levels (VTVM output) on R and L channels become minimum. |
| 10. FM STEREO SIGNAL SEPARATION CONTROL | Connect FM stereo SG to FM ANT terminals. 19 kHz signal ON. Main channel, sub channel signal ON. Apply 1000 Hz signal from L Ch. | Scope and AC-VTVM to RIGHT TAPE output jack. | Adjust VR06 (10k) for minimum output. | |
| Same as above for RIGHT channel. | Scope and AC-VTVM to LEFT TAPE output jack. | |||
What is the procedure for AM Tuner Alignment on the FISHER RS-2004A?
For AM Alignment, set the GRAPHIC EQUALIZER switch to OFF, SPEAKERS switch to PHONES position, FUNCTION switch to AM position, and VOLUME to MIN. Maintain generator output as low as possible for suitable indications.
| ITEM | GENERATOR | AM DIAL SETTING | INDICATOR | PROCEDURE |
|---|---|---|---|---|
| 1. IF ALIGNMENT | Connect 455 kHz sweep generator to VC5 and ground lead to chassis. Use 0.1 µF capacitor in series with generator lead. | Position of non-interference near 1400 kHz. | Scope vertical input to TP24, and ground lead to chassis. Set vertical sensitivity to 0.2 V/cm. | Connect jumper to Pin 3 and chassis ground. Adjust IFT02 (top slug) for maximum gain and best symmetry. Keep signal low enough for noise on response. Dis-connect jumper after completion of AM IF Alignment. |
| 2. FRONT END ALIGNMENT (600 kHz) | AM generator to EXT AM ANT and GND terminals. Set to 600 kHz. Modulate with 400 Hz (30% modulation). | Center of 600 kHz calibration mark on dial. | Front panel Field Strength meter (M1). | Adjust OSC01 and AM ANT (L01) for maximum Field Strength meter indication. Reduce generator output to keep meter reading below 3. |
| 3. FRONT END ALIGNMENT (1400 kHz) | Set to 1400 kHz. | Center of 1400 kHz calibration mark on dial. | Front panel Field Strength meter (M1). | Adjust VC04 and VC05 for maximum deflection. Keep meter reading below 3. Repeat steps 2 and 3 until optimum alignment is reached. |
What are the DC voltages for the various P.C. Boards in the FISHER RS-2004A?
POWER AMP P.C. BOARD TRANSISTOR DC VOLTAGES
| SYMBOL No. | DEVICE | B | C | E | SYMBOL No. | DEVICE | B | C | E | |
|---|---|---|---|---|---|---|---|---|---|---|
| Q01,02 | 2SC1570 | 3.0V | 10.5V | 2.4V | Q11,12 | 2SB560 | 40.2V | 1.0V | 40.8V | |
| Q05,06 | 2SC1570 | -41.9V | -40.7V | -41.3V | Q13,14 | 2SC1175 | 0.2V | 0.9V | 0V | |
| Q07,08 | 2SC1570 | -40.7V | -1V | -38.0V | Q15,16 | 2SA659 | 0.2V | -0.9V | 0V | |
| Q09,10 | 2SD438 | -38.0V | -1V | -39.0V | Q03,04 | 2SA798 | 0.07V | -40.7V | 0.6V | -38.2V |
AM-FM RF/IF MPX P.C. BOARD TRANSISTOR DC VOLTAGES
| SYMBOL No. | DEVICE | B | C | E | SYMBOL No. | DEVICE | B | C | E |
|---|---|---|---|---|---|---|---|---|---|
| Q01 | 2SC930 | 2.4V | 13.4V | 1.8V | Q05 | 2SC536 | 0.06V | 15V | 0.06V |
| Q02 | 2SC536 | 0.6V | 0.7V | 0V | Q06 | 2SC536 | 0.6V | 0.06V | 0V |
| Q03,04 | 2SC1570 | 1.6V | 11.9V | 1.0V | Q07 | 2SC536 | 3.4V | 7.7V | 2.7V |
AM-FM RF/IF MPX P.C. BOARD IC PIN NUMBERS VOLTAGES
| SYMBOL No. | DEVICE | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| IC01 | LA1230 | 2.7V | 2.7V | 2.7V | 0V | 2.3V | 5.6V | 5.6V | 5.6V | 5.6V | 5.6V | 12.8V | 4.5V | 0.1V | 0V | 5.0V | 0V |
| IC02 | HA11223 | 11.6V | 3.5V | 4.8V | 0.7V | 8.9V | 8.8V | 0V | 0.06V | 5.6V | 2.8V | 2.8V | 2.8V | 2.8V | 2.8V | 4.5V | 3.0V |
| IC03 | LA1240 | 4.6V | 1.6V | 13.5V | 11.5V | 13.5V | 3.3V | 1.2V | 2.6V | 11.4V | 0V | 13.8V | 2.0V | 0.6V | 2.0V | 0.1V | 1.1V |
EQ PRE AMP P.C. BOARD TRANSISTOR DC VOLTAGES
| SYMBOL No. | DEVICE | B | C | E | SYMBOL No. | DEVICE | B | C | E |
|---|---|---|---|---|---|---|---|---|---|
| Q01,02 | 2SC1570 | -0.8V | 20.6V | -1.4V | Q07,08 | 2SC1570 | -0.4V | 19.3V | -1.0V |
| Q03,04 | 2SC1570 | -0.2V | 19.3V | -0.8V | Q09,10 | 2SC1570 | -0.3V | 19.3V | -0.9V |
| Q05,06 | 2SC1570 | -0.2V | 19.3V | -0.8V | Q11,12 | 2SC1570 | -0.5V | 19.3V | -1.2V |
POWER SUPPLY P.C. BOARD TRANSISTOR DC VOLTAGES
| SYMBOL No. | DEVICE | B | C | E | SYMBOL No. | DEVICE | B | C | E |
|---|---|---|---|---|---|---|---|---|---|
| Q01 | 2SD330 | 16.1V | 21.5V | 15.5V | Q03 | 2SB514 | -24.7V | -33.5V | -24.1V |
| Q02 | 2SD330 | 24.6V | 33.0V | 24.0V |
What are the general notes for reading the schematic diagram of the FISHER RS-2004A?
1. Line voltage isolation transformer set to 110V AC for all voltage measurements.
2. All voltages are ±20%, unless otherwise noted. XXXDC denotes DC voltage measured with DC VTVM to chassis.
3. All capacitor values are microfarad unless otherwise noted.
4. All resistor values are ohms, ±5%, 1/4W watt unless otherwise noted.
What are the functions for each position of the Speaker Switch on the FISHER RS-2004A?
| POS | FUNCTION |
|---|---|
| 1 | POWER OFF |
| 2 | PHONES |
| 3 | SPEAKER A |
| 4 | SPEAKER B |
| 5 | SPEAKER A+B |
How are the transistor leads and diodes identified for the FISHER RS-2004A?
Transistor Lead Identification:
For the following transistors, when viewed from the front (flat side), the leads from left to right are Emitter (E), Collector (C), Base (B):
- 2SC536
- 2SC930
- 2SC1175
- 2SC1570
- 2SC1571
- 2SA659
- 2SC732
For the following transistors, when viewed from the front (flat side), the leads from left to right are Emitter (E), Collector (C), Base (B):
- 2SB560
- 2SD438
For transistor 2SD330, when viewing the component with the metal tab at the back, the leads from left to right are Base (B), Collector (C), Emitter (E).
For transistor 2SA798, when viewing the component from the front (flat side), the leads from left to right are Base (B), Collector (C), Emitter (E), Collector (C), Base (B).
Diode Identification:
- S5VB20 is a bridge rectifier with markings for AC and +/- DC outputs.
- RD-24FB and WZ157 are axial diodes with a band indicating the cathode.
- DS130YD is a cylindrical diode.
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