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66RADIOSERVICING
DECCA“DEBONAIRE”ModelTP44
GeneralDescription:Six-transistor,two-wavebandportablereceiver
withco-axialsocketconnectionforexternalaeriaL,
了PowerSupply:Two6-voltbatteries(PPTorequivalentsj。No-sigoal
consumptionr2mA-
TransistorAnalysis:FollowingreadingstakenonAvoModet8,ro-or
25-yoltrangecsunderno-signalconditions,volumecontrolminimum,positive
leadtochassis-
一总、六TR6
TiR2TAR5
oOCc4x|0C45|0C75|OCSrD|oOCsz|DC8r
Emittervoltage.|48mw|6|Verlow
Collectorvoltage,|8o8.286|5下|
Notethatstandardwiringcodeisused:greenbase;Whiteeollector;redemitter工RS,
TR6mustbematchedpair,DA7odeteetotdiode.
AlignmentProcedure:Outputreadingstakenwithmeteracross
speakercoilonlowA.C.range,工下:Inject472kcjfs.acrossLIwithseton
MLW.(gangclosed),keepinginputlow,Peaktopandbottomcoresof
TaandT3andpeaksinglecoreofT4reducinginputasnecessary。Repeat
adjustments,惟.玉:Inject652kcfs.toaerialsocketviaiFkresistortune
to46om,andadjustTathenLITuneto23omwinject:3oo-kcjs.signal
andadjustCrrthenCa2,Repeatsequenceofoperations。,工.到,lnject
179kcAs,asabove,tuneto1750mandadjustCrz。(Astheremaybe
someoscillatorpullingwhentuningCrz,takecaretoadjustLaandCrz
CIRCCITDiAcRA一
S
CoMPoNENT
LAY-oUT
formaximumsignalatcorrecttrackiogpoint)Tuneto125oiminject
24o-kcjs.signafandadjustC4。Repeatseduence,
ServicingINotes:Takegreatcarenottoscratchorchipthepaint
coveringonthetransistors。WhensolderingusefeasonabIysizedPairof
pliersasheatsink,Electriesoldering-ironsshouldbeearthed,asirons
oftenhaveaveryslight
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