damaging the fuse holder. DO NOT FORCE THE
THREADS. Seating of the cap in the fuseholder body should be easily accomplished withoutexcessiveforce.
AC ON/OFF SWITCH |
|
|
The AC ON/OFF switch controls power to the power tr | ansformer and circuits of the | |
GFA555ms.WhenevertheGFA555msisenergized,the |
| redPOWERLEDwillglow.Push |
thetopoftherocker switchtoenergizetheGFA55 | 5ms. Pushthebottomoftherocker | |
switchtoturntheunitoff. |
|
|
POWER LED |
|
|
ThisLEDwillglowwhenevertheACON/OFFswitchis |
| turnedonandtheGFA555msis |
energized.IftheACLINEFUSEblows,thePOWERLED |
| willceasetoglow. |
ThePOWERLEDindicatesthatthereisACvoltagebe ingfedtotheamplifier,butitdoesnot signifythatalltheamplifier'scircuitsareinop eration.If,forexample,youhaveblownoneor
moreoftheDCRAILFUSES.,theamplifierwillnot operate thatis,theamplifierwillnot
produceanyaudiosignaleventhoughthePOWERLE Dglows.Similarly,iftheTHERMAL PROTECTIONLEDglows,theamplifierwillnotproduc esoundeventhoughthePOWER LEDmaystillglow.
Additionally,theinternalpowertransformerispro videdwithathermostatwhichwillinterrupt powerintothetransformerifitstemperatureexcee ds125°C.Thishighatemperaturewill seldom,ifever,beencounteredunlesstheamplifie rissubjectedtoabnormalconditions,
suchasoperationintoloads ofless than1ohmat veryhighlisteninglevels,etc. Ifthe POWERLEDdoesnotglow,theTHERMALPROTECTIONLED isoutandboththeDC RAILFUSESandACLINEFUSEareintact,theindicat ionwouldbethatthethermostat withinthetransformerhasopened.
Oncethetemperaturewithinthetransformerdecreas | estoanormallevel,thethermostatwill |
resetitselfandnormaloperationwillresume. If y | ouaretoavoidtrippingcontinuallythe |
thermostat in thetransformer, you must reducethe | sound level demands intosuch low |
impedances,installauxiliaryfancoolingontheam | plifier,orboth. |
Foramoredetaileddescriptionoftheoperationof theTHERMALPROTECTIONLEDcircuit andtheDCRAILFUSES,pleaserefertotheirrespec tivesections.
