User manual JEFF ROWLAND MODEL 112

[. . . ] Fail-safe operation provided by user-resetable thermal circuit breakers located on rear panel. · · · RCA input Connectors for unbalanced system configurations. User selectable switching between balanced and unbalanced connections. · · Quiet, transient-free operation during power and function mode switching. Automatic input muting under anomalous input or output operating conditions. · · 12V remote ON/OFF power switching connector. Automatic temperature stabilizing circuitry maintains constant operating temperature. · Fully-balanced Differential ModeTM circuit topology implemented from input to output. · CE approved speaker output connectors requiring no tools for tight connections. · Low resonance, structurally integrated chassis constructed of precision-machined aircraft grade aluminum. · Automatic bias adjustment maintains optimal bias setting regardless of source material or loudspeaker load. Features Contents Model 112 Stereo Power Amplifier AC Power Cable Warranty Card Warranty Initial Inspection the shipping container for damage. [. . . ] This will prevent small scratches from marring the surface before the surface coating has had a chance to harden completely. The top cover, sides, and bottom cover can all be cleaned with a soft cotton cloth (such as an optical lens cleaning cloth or fine furniture polishing rag) dampened with plain water. Water should be applied directly to the cloth and not the chassis. If a mark has been left on the chassis, do not use any type of abrasive or chemical cleaner to remove the mark. A very mild plastic or glass cleaner that does not contain ammonia should be tried only as a last resort. Please contact the factory before trying any type of cleanser on the chassis other than water to clean the unit. The front panel of the unit should never be cleaned with anything other than a very soft cotton cloth and plain water or fine oil- Maintenance A ll Jeff Rowland Design Group products are designed to provide a · lifetime of enjoyment and listening pleasure. The chassis is sealed to prevent dust from entering and the interior of the chassis should not need cleaning during the lifetime of the product. All internal circuitry is self-adjusting or stable so no adjustments or maintenance of any kind should be necessary over a lifetime of normal operation. If the amplifier is ever in need of service, updating, or upgrading, it should only be returned to an authorized repair facility or technician for servicing. It is not recommended that the customer attempt to disassemble or repair the unit and doing so may void your warranty. · Care Amplifier Front and Rear Panel Function Controls Standby/Power Button Power Indicator LED Right Channel Input Select Switch NEUTRIK NEUTRIK PUSH PUSH Left Channel Input Select Switch Amplifier Front and Rear Panel Function Controls B efore attempting any system interconnection, please familiarize yourself with the front and rear panel controls of the Model 112 Stereo Power Amplifier. The descriptions below refer to the diagrams above. Front Panel 1 FRONT PANEL STANDBY/POWER BUTTON: Press this button to Rear Panel (Note: If desired, the switch described below can be switched while the amplifier is operational and playing music. ) operate the amplifier. Press again to place the amplifier in Standby mode. The small orange POWER INDICATOR LED will illuminate when the amplifier is operational. When the POWER INDICATOR LED is not illuminated, all amplifier inputs are muted and internal circuitry reverts to power-saving (Standby) mode. Anomalous operating conditions will place the amplifier in Standby mode and will prevent the amplifier from being switched back on again until such a condition is eliminated. To avoid spurious noises, the amplifier should never be turned on if the inputs on the rear panel are not connected. Note: All ON/OFF power switching should be initiated ONLY with this button. The amplifier should never be disconnected from AC power without first placing the amplifier in Standby mode. 1 INPUT SELECT SWITCH: This switch selects either the unbalanced RCA inputs or the balanced XLR inputs. Note: When the RCA position is selected, pin 2 of the XLR is shorted to pin 1. Control Functions Rear Panel Power Connections Amplifier Rear Panel AC Power Cable Connector NEUTRIK NEUTRIK PUSH Volts AC Indicator PUSH Installation L ocate the amplifier as close as possible to its final installation point. Allow access to the rear panel for making connections. Rear Panel Power Connections Connections Important: Please strictly follow the steps in order as outlined below before operating your Model 112 Stereo Power Amplifier. The Model 112 Stereo Power Amplifier is convection cooled, eliminating the need for fan or forced-air cooling. When operating, the chassis should have at least two (2) inches of air space around the heatsink areas. Multiple units can be stacked vertically, facilitating an upward flow of warm air currents throughout the vertical heatsink areas. [. . . ] Identify and correct abnormal conditions such as low frequency rumble and/or acoustic feedback caused by phono playback (if applicable). Reduce volume slightly or use higher efficiency loudspeakers. Consult your dealer immediately to have the amplifier reconfigured for the proper AC mains voltage. Use balanced system configuration if possible. [. . . ]