What to do if my Sherwood Receiver AMP sound is dead?
If the AMP sound on your Sherwood Receiver is dead, it could be due to several reasons: * Inferior Signal Mute TR. * Connector disconnection or disjunction. Try changing or ensuring firm insertion of the connector. * Speaker wire disjunction. Ensure firm insertion of the speaker wire. * Problem with the Signal switching IC.
What to do if my Sherwood R-772 Receiver is not turning on?
If your Sherwood Receiver fails to power on (FLT and ST-BY LED do not light up), consider the following: * Check the AC cord. * Check the Power Trans (Main/ST-BY). * Check for Fuse disconnection. * Look for Connector disconnection or disjunction; change or ensure firm insertion of the connector. * Inspect for an inferior ST-By switch. * Check the VFD Driver I.C & Resonator.
Why does my Sherwood Receiver power off after 2-3 seconds?
If your Sherwood Receiver powers off within 2-3 seconds of being turned on, the following could be the cause: * Regulator I.C failure. Check the signal IN/OUT. * Drive transistor failure (POWER TR). * Protection circuit issue. Check the output DC. * Connector disconnection or disjunction. * SLEEP MODE may need cancellation.
What causes AC-3/DTS/HDMI failure in Sherwood R-772?
AC-3/DTS/HDMI failure (DSP Sound Mode) on your Sherwood Receiver can be attributed to: * I.C Regulator issues. * DIR problems. * DSP Check problems. * D/A problems. * HDMI problems.
What to do if the bass/treble control fails on Sherwood R-772 Receiver?
If the bass/treble control is not working on your Sherwood Receiver: * Check the bass volume, including a Resister/Capacitor correction figure check. * Check the TONE I.C.
Why is there a bump sound during input-select switch change on Sherwood R-772?
A bump sound during input-select switch changes on your Sherwood Receiver may be due to: * FRONT Mute transistor issues. * CENTER Mute transistor issues. * SURROUND Mute transistor issues. * SURROUND BACK Mute transistor issues.
What causes OSD failure on Sherwood R-772 Receiver?
OSD failure on your Sherwood Receiver can be caused by: * I.C voltage issues. Check OSD I.C voltage at (5) V. * OSD I.C OSC issues at (14.32) MHz. * Micom control data issues.
Why is there sound from the speaker when headphones are connected to my Sherwood R-772 Receiver?
Speaker sound when headphones are connected to your Sherwood Receiver is possibly due to: * Inferior HEADPHONE JACK connection.
What causes a Sherwood R-772 Receiver fuse disconnection?
Fuse disconnection in your Sherwood Receiver could be due to: * Inferior transformer. * AMP drive transistor failure (POWER TR). * AMP drive I.C failure (POWER IC). * Voltage issues.
Why is the video output dead on my Sherwood Receiver?
If the video output is dead on your Sherwood Receiver, it could be due to: * Video voltage issues. Check DC voltage. * Video selector control IC problems. * Video input detect port issues.
Technical specifications for the front amplifier section of the receiver.
Technical specifications for the center amplifier section of the receiver.
Technical specifications for the surround amplifier section of the receiver.
Technical specifications for the surround back amplifier section of the receiver.
Technical specifications for the subwoofer output of the receiver.
Technical specifications for the stereo audio section of the receiver.
Detailed specifications for various video signal input and output paths.
Detailed technical specifications for the FM tuner performance.
Detailed description of each pin function for the main microcontroller.
Block diagram showing the internal structure of the microcontroller.
Detailed explanation of the functions of microcontroller pins.
Table mapping input voltage ranges to specific key functions.
Procedures for aligning the tuner in non-RDS versions of the receiver.
Steps for aligning the AM and FM tuners for non-RDS models.
Procedures for aligning the tuner in RDS versions of the receiver.
Steps for aligning the AM and FM tuners for RDS models.
Steps for aligning the AM tuner for RDS models.
Diagnosing and resolving issues related to the unit not powering on.
Diagnosing and resolving issues related to button input or key signals.
Diagnosing and resolving issues with no audio output from amplifier channels.
Resolving issues with specific audio formats like AC-3, DTS, HDMI.
Diagnosing and resolving issues with the On-Screen Display (OSD).
Diagnosing and resolving problems with video signal output.
Diagnosing and resolving issues specific to FM and AM tuner performance.
Detailed description of pin functions for integrated circuits.
Functional block diagrams for key integrated circuits.
General| Frequency Response | 5Hz-100kHz (+0, -3dB) |
|---|---|
| Tuning range | FM, MW |
| Input sensitivity (MM) | 2.5mV |
| Input sensitivity (line) | 200mV |
| Input Sensitivity | 2.5mV (MM), 200mV (line) |
| Signal-to-Noise Ratio | 75dB (MM), 95dB (line) |
| Speaker load impedance | 8Ω to 16Ω |
| Video Connections | composite |
| Power Output | 100 watts per channel into 8Ω (stereo) |
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