Why is my Sherwood RX-4109 Stereo Receiver hissing during AM reception?
If your Sherwood Stereo Receiver is producing continuous or intermittent hissing noise during AM reception, especially at night, the noise may be caused by motors, fluorescent lamps, or lightning. Keep the receiver away from these noise sources. Consider installing an outdoor AM antenna.
How to improve FM reception on my Sherwood RX-4109 Stereo Receiver?
If your Sherwood Stereo Receiver has poor FM reception, connect an antenna. If an antenna is already connected, try repositioning it for better signal.
What to do if my Sherwood Stereo Receiver can't receive radio stations?
If you can't receive stations on your Sherwood Stereo Receiver, connect an antenna. Tune in the desired station frequency. Try moving the antenna for better reception.
How to fix a Sherwood RX-4109 Stereo Receiver that won't turn on?
If your Sherwood Stereo Receiver has no power, ensure the AC input cord is securely connected. Also, test the AC wall outlet with a lamp or another appliance to confirm it is active.
Why is the bass or treble control not working on my Sherwood Stereo Receiver?
If the bass or treble control fails on your Sherwood Stereo Receiver, check the TONE VOLUME IC. Verify the signal IN/OUT terminal, the IC voltage (+10V), and the IC control data.
Why is there no sound from the amp on my Sherwood RX-4109?
If the AMP sound is dead on your Sherwood Stereo Receiver, with either L/R or just the Left channel not working, the Signal Mute TR's may be inferior. Also, check for any connector disconnections or disjunctions, and ensure they are properly inserted.
Why is there no sound from the tuner on my Sherwood RX-4109 Stereo Receiver?
If the tuner sound is dead on your Sherwood Stereo Receiver, with either L/R, Left, or Right channels not working, the MUTE TR may be inferior. Check for any connector disconnections or disjunctions and ensure they are properly inserted. Also, the FM DET COIL, AM IFT COIL, or MPX I.C might be faulty. Verify the MPX I.C signal IN/OUT terminal and its driving voltage (+9.1V).
Why is my Sherwood Stereo Receiver remote not working?
If your Sherwood Stereo Receiver remote control isn't working, replace the batteries. Also, make sure nothing is blocking the remote sensor.
Amplifier Section| Power output | 2X100 W |
|---|---|
| Total harmonic distortion | 0.04 % |
| Intermodulation distortion | 0.02 % |
| Input sensitivity (Phono) | 2.5 mV |
| Input sensitivity (Line) | 200 mV |
| Signal to noise ratio (Phono) | 70 dB |
| Signal to noise ratio (Line) | 95 dB |
| Frequency response (Phono) | ±3 dB |
| Frequency response (Line) | ±3 dB |
| Output level | 200 mV |
| Bass/Treble control | ±10 dB |
FM Tuner Section| Tuning frequency range | 87.5~108 MHz |
|---|---|
| Usable sensitivity | 15 dBf |
| 50 dB quieting sensitivity | 25.2/45.2 dBf |
| Signal to noise ratio | 68/65 dB |
| Total harmonic distortion | 0.5/0.8% |
| Frequency response | ±3 dB |
| Stereo separation | 40 dB |
| Capture ratio | 4 dB |
| IF rejection ratio | 80 dB |
AM Tuner Section| Tuning frequency range | 520~1710 kHz |
|---|---|
| Usable sensitivity | 800 μV/m |
| Signal to noise ratio | 40 dB |
| Selectivity | 25 dB |
General| Power supply | 120 V~ 60 Hz |
|---|---|
| Power consumption | 2.5A |
| Dimensions | 440×138×370mm |
| Weight | 8.85 kg |
Detailed specifications and functions of each pin for IC401.
Visual representation of the internal structure and connections of the IC.
Defines the electrical parameters and frequency ranges for tuner operation.
Lists measured electrical performance criteria and test conditions.
Identifies specific locations on the circuit board for calibration adjustments.
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