74
CONTROL UNIT
11
● Afterthevolumehasbeenreplaced,besuretosetthevolumevalueonthetest
modecalibrationscreenandtheinputtestscreenandcheckvariationsinthe
volumevalue.
● Afteradjustingorreplacingamicroswitch,alwayscheckON/OFFoftheswitch
ontheinputtestscreenofthetestmode.
● HandlepartsinsidetheControlUnitverycarefully.Beespeciallycarefultoavoid
damage,deformationorlossoftheseparts.Ifanyoneofthesepartsislostor
defective,itcanresultindamagesand/orfaultyoperations.
CONTROL UNIT
11
● Whenworkingwiththeproduct,besuretoturnthepoweroff.Workingwiththe
poweronmaycauseanelectricshockorshortcircuit.
● Becarefulnottodamagethewires.Damagedwiresmaycauseanelectric
shock,shortcircuitorpresentariskofre.
● Donottouchanypartsthatarenotspeciedinthesedirections.Touchingun-
specied
locationsmayleadtoelectricshockorcauseshortcircuits.
● Thisworkshouldbeperformedbysitemaintenancepersonnelorotherskilled
professionals.Workperformedbynon-technicalpersonnelcancauseasevere
accidentsuchasanelectricshock.
● Exerciseduecautioninperformingsolderingprocedures.Ifsolderingironis
handledcarelessly,therecouldberesorburns.
● Proceedverycarefullywhenheatingthermalcontractiontube.Carelessop-
erations
canresultinresorburns.
● Whenfasteningplasticparts,becarefulnottotightenscrewsandnutsexces-
sively.Otherwisepartsmaybedamaged,resultingininjuriesfromfragments,etc.
● Becarefulnottogethandorngercaughtwhenremovingorattachingtheparts.
● Disconnectionandconnectionofconnectorswillbeperformedwithinthenar-
row
cabinetspace.Takeduecarenottoscratchorotherwiseinjureyourself.
● TakecarewhencarryingtheremovedControlUnits.Suchheavyliftingcarriesa
riskofinjurytobackorshoulders.
If the operability of the Control Unit is unsatisfactory, or if settings on the test mode calibration screen are ineffec-
tive, the problem could be a defective mechanism, displacement of the position where volume or microswitch has
been fastened, or malfunctioning of volume or microswitch.
Carry out the following procedure to replace Control Unit or microswitch. Also be sure to grease the mechanical
components of the Control Unit once every 3 months.