4 Input A/V Switcher with Automatic Input Mode and Volume Stabilizer Model SVS-4 User Manual
Table of Contents WHAT’S INCLUDED .........................................................................2 INTRODUCTION................................................................................3 IMPORTANT SAFETY PRECAUTIONS.........................................3 FRONT PANEL ...................................................................................4 REAR PANEL ......................................................................................5 IR REMOTE CONTROL, SRC-1 .................
Introduction The Sima model SVS-4, 4 Input Audio / Video Switcher with Automatic Input Mode (AIM) and Volume Stabilization has been designed for the home theater, DSS satellite, DVD, audio recording as well as for background music applications. The SVS-4 has the following features: • Four A/V inputs to allow you to add more A/V sources such as DVD, satellite dish, VCR, games, etc. to your TV and home theater system. The unit supports stereo audio as well as both composite and S-Video.
Front Panel Figure 1, SVS-4 front panel Controls 1 - Power / Stand-by - Press to turn unit on or off. The Power/Stand by light will be on when the unit is operational and dim when it is in the standby mode. 2 - Inputs 1 through 4 - Press to select desired input. The light above the switch will light to indicate the current active input. 3 - Auto Input Mode - Press to turn AIM on or off. If on, the unit will scan the video inputs and automatically turn on and select the input to the device you turned on.
Rear Panel Figure 2, SVS-4 rear panel 6 - S-Video inputs, 1 through 4 from the SVideo output of your VCR, DSS or DVD devices. 7 - Composite Video inputs, 1 through 4 from the composite video output of your VCR, DSS or DVD devices. 8 - Left and Right audio inputs, 1 through 4 from the audio output of your VCR, DSS or DVD devices.
Typical Hook up This shows a overview of a typical system with the SVS-4 using 4 A/V sources, a TV and Surround system. The outputs of up to 4 devices can feed into the inputs on the SVS-4. It can then select one of the devices to watch on your TV and/or listen on your receiver. Refer to the diagrams on the next few pages for more detailed connection diagrams. Figure 4, Overview of typical system Step 1 Connect the AC adapter to 120 VAC and plug the DC cord into the 15 v input on the SVS-4.
In this case you have several options. Option A: For ease of use, the SVS-4 has a composite to S-Video converter . You can feed a combination of composite and S-Video to the SVS-4 and feed only a S-Video signal to your TV. This lets you use just one S-Video input on your TV and all sources will automatically be displayed there. Option B: If your TV has 2 video inputs that supports both composite video and S-Video inputs, you can feed both the composite and S-Video outputs from the SVS-4 to your TV.
Figure 5 below shows a hook up showing only two input sources. Be sure you use either S-Video or composite video inputs, but not both on the same input. The one SVS-4 output goes to the TV so you can watch and listen on your TV. The second output (audio only) goes to the stereo receiver so you can listen to music or surround sound audio using your stereo receiver. Figure 5, Hook-up in typically system Note: Remember to always connect the outputs on your VCR/DSS/DVD/etc. to the inputs on the SVS-4.
Figure 6 below shows a system with 3 sources. It also shows using the dual outputs to allow you to record on a VCR, watch the video on the TV and listen to the sound on a surround system. As shown below, you can select inputs 1, 2 or 3 (not 4 as you would be trying to record to itself) and record on the Recording VCR the video and audio from the selected source. Figure 6, SVS-4 with recording VCR Note: Remember to select the A/V or AUX input on the recording VCR to record the output of the SVS-4.
Operation When AC power is first applied, all outputs will be muted and all the lights will come on for 1 second and then go out. The Power / Stand-by light will be lit dim red. The Auto Input and Volume Stabilization modes will be active as default. When the unit detects an active video input (composite or S-Video), the Power / Standby light will turn on full and the active input will be selected.
Volume Stabilizer Active If the Volume Stabilizer Active light is on, then the output of the audio switcher will be routed through the Volume Stabilizer circuitry. When the Volume Stabilizer Active light is off, the audio signal is bypassed and the Volume Stabilization setting will not have any affect on the audio signal. Volume Stabilization Adjustment The Volume Stabilization circuitry lets you control the dynamic range of the audio signal to accommodate your needs.
How it works This section has more technical information for the person who wants to learn more about the SVS-4. In the block diagram below you can see how the audio and video inputs are selected and fed to the output buffer amplifiers. (Only the left audio channel is shown) Notice how the Volume Stabilizer Active switch allows you to bypass the Volume Stabilizer circuitry.
the curves intersect at the -10 dbv point. Looking at the 1:1 line, you can see if an input signal is at the 20 dbv level (slightly soft volume wise) it will come out also at -20 dbv. Thus no change. If the unit is set for 10:1 compression, the same -20 input will come out at about -11 dbv as shown in the diagram below. Thus this signal is boosted about 9 db. Likewise, if the input signal goes up to 0 dbv, the output will be -9 dbv.
Trouble Shooting Problem Power/Stand-by light does not come on No video output No audio output No input is selected Picture is black and white AIM does not detect device when turned on Unit goes to standby after 5 seconds Volume seems to vary too much between sources Video stays on when in standby mode IR remote does not work Solution Make sure power adapter is plugged into a working outlet.
Technical Specifications Audio Inputs, (4 stereo) Input impedance, 47 Kohms Typical input level, 300 mv Frequency response 20 to 20KHz, +/- 3db (bypass mode) Signal to Noise ratio, greater than 70 db THD less than 0.
Limited Warranty Limited Warranty Sima Products Corp. (“Company”) warrants that is the accompanying product proves to be defective to the original purchaser in material or workmanship within 90 days from the original retail purchase, the Company will, at the Company’s option, either repair or replace same without charge (but no cash refund will be made).
