Parasound A 51 manual Understanding the Indicators on the a

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8UNDERSTANDING THE INDICATORS ON THE A 51

aAC Present Indication

When the A 51 is plugged into a live AC outlet, a soft blue halo glows behind its On-Off button and its red “P” Badge glows faintly. These indicate that the unit is plugged into a live AC outlet, even when it is turned off.

bOn, Off and Fault/Protection Status Indicators

Whenever the A 51 is turned on, the soft blue glow behind its On-Off button will change to red for about five seconds as its internal circuits stabilize. Then the red glow is replaced by a brighter blue glow to indicate normal operation. If the glow remains red after turn on or while the amp is playing, it indicates activation of the A 51’s protection circuits and no sound will be heard from the speaker.

The A 51 protects itself from external conditions such as excessive heat, load impedance that is too low, or a short-circuited speaker connection or wire. After you correct the fault, the A 51 will resume operation. If the A 51 remains “in protection” after it has cooled down and you’ve confirmed there are no external faults, it could indicate an internal problem. Please contact Parasound’s Technical Service Department.

c – g Channel Status Indicators

These are the five small round indicators in the center of the recess in the front panel. The indicator on the left displays the status of channel one and the subsequent indicators display the status of channels two through five.

c – g All Indicators Illuminated

When all five channels are operating normally, these will all glow blue.

c – g No Illumination:

When the A 51 is turned off, these indicators are off. An indicator that does not glow when the A 51 is turned on represents a fault in that channel.

hHigh-Temp Indicator

This indicator is near the right side of the panel recess. It will glow red if any channel over- heats. The On-Off button will also glow red if the A 51 overheats. Refer to the Troubleshooting Guide on page 11.

Amplifier

A 51

On-Off

 

Hi Temp

 

 

 

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Contents Amplifier Parasound Staff Unpacking Your a Thank YOUCongratulations and Thank You for Choosing Parasound Keeping Records for Future ReferenceTable of Contents Rack Mounting Your Parasound a Placement Guidelines for Your aTo attach the rack mount brackets Left and Right Balanced Input Jacks Before Connecting What You’ll NeedBalanced XLR Jacks and Their Pin Configuration To ConnectCh 1-5 Unbalanced Inputs Before ConnectingWrite Down Your Connections Speaker Terminals Connecting Your Speakers to the aSpeaker Wire Length and Gauge thickness Correct Speaker Polarity is ImportantTurn Off Delay in the Audio Mode Connecting an Active Audio Source for Automatic On-OffManual and Automatic Turn ON-OFF Options Connecting AN External DC Source for Automatic Turn ON-OFF FuseUnderstanding the Indicators on the a AC Power Connections Connecting the a 51 AC Power Cord120 V or 220 V 240 V Operation Maintaining Your a Troubleshooting Guide Trouble Probable Cause RemedyIf All Else Fails -Call Us for Help Procedure for Returning Your a 51 to Parasound for ServiceServicing Your a Important Notice Shipping the aAudio Trigger Sensitivity Adjustment Technically SpeakingTechnically Speaking Parasound a 51 Design Overview Circuit Designed by John CurlParasound a 51 Design Overview Parasound a 51 Specifications Parasound Products, Inc Battery Street, San Francisco, CA
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