CONTENTS
SAFETY PRECAUTIONS.........................................................................................................................................................2
SERVICEHINTS......................................................................................................................................................................3
ADJUSTMENT PROCEDURE AND SELF-CHECK..................................................................................................................4
WAVEFORM PATTERN TABLE...............................................................................................................................................5
ALIGNMENT SETTINGS..........................................................................................................................................................6
BLOCKDIAGRAMS..................................................................................................................................................................7
PARTS LOCATION.................................................................................................................................................................10
REPLACEMENT PARTSLIST................................................................................................................................................11
SCHEMATICDIAGRAMS.......................................................................................................................................................19
CONDUCTOR VIEWS............................................................................................................................................................22
SAFETYPRECAUTION
GENERALGUIDELINES
1.Itisadvisabletoinsertan isolationtransformerinthe
a.c.supplybeforeservicing ahot chassis.
2.When servicing,observethe originallead dress inthe
high voltagecircuits.Ifashortcircuit isfound,replace
all partsthathave been overheated ordamagedby
the shortcircuit.
3.Afterservicing,seethatall the protectivedevices
suchasinsulationbarriers,insulationpapers,shields
andisolationR-Ccombinations arecorrectly
installed.
4.When thereceiverisnotbeingused foralong period
oftime, unplug the powercordfromthe a.c.outlet.
5.Potentialsashigh as 32kVarepresent when this
receiverisinoperation. Operation ofthereceiver
withoutthe rearcoverinvolvesthe dangerofashock
hazardfromthe receiverpowersupply.Servicing
shouldnot be attempted byanyone who isnot
familiar withtheprecautions necessarywhen working
on high voltageequipment.Alwaysdischargethe
anodeofthetube.
6.After servicing make the following leakage current
checks topreventthe customerfrombeing exposed
toshockhazard.
LEAKAGECURRENTCOLDCHECK
1.Unplug thea.c.cordandconnectajumperbetween
the twoprongs ofthe plug.
2.Turnonthe receiver!spowerswitch.
3.Measuretheresistancevalue withan ohmmeter,
between the jumpered a.c.plug and each exposed
metalliccabinetpart on thereceiver,suchasscrew
heads,aerials,connectors,controlshaftsetc.When
the exposedmetallicparthas areturnpathtothe
chassis, thereading shouldbe between4Mohmand
20Mohm.When theexposedmetaldoes nothave a
returnpathtothechassis,the readingmustbe
infinite.
LEAKAGECURRENTHOTCHECK
1.Plug thea.c.corddirectlyintothea.c.outlet.Donot
useanisolation transformerforthischeck.
2.Connecta2k 10Wresistorinserieswithan
exposed metallicpartonthe receiverand an earth,
suchasawaterpipe.
3.Use an a.c.voltmeter withhighimpedanceto
measurethepotentialacrossthe resistor.
4.Checkeach exposed metallicpartand checkthe
voltage ateachpoint.
5.Reverse thea.c. plugatthe outletand repeateach of
the previousmeasurements.
6.The potentialatanypointshouldnotexceed
1,4Vrms.Incase ameasurementisoutside the limits
specified,thereisapossibilityofashockhazard,and
the receivershouldbe repaired and rechecked before
itisreturned tothecustomer.
X-RADIATIONWARNING
1.The potentialsourcesofX-RadiationinTV setsare
the highvoltage section and thepicturetube.
2.When using apicturetube testjigforservice,ensure
thatthe jigiscapableofhandling 32kVwithout
causing X-Radiation.
NOTE:Itisimportanttouseanaccurateperiodically
calibratedhigh voltage meter.
1.Setthe brightnesstominimum.
2.Measurethehigh voltage.The metershouldindicate:
31kV±1kV.
Ifthemeterindicationisoutoftolerance,immediate
serviceand correctionisrequired topreventthe
possibilityof prematurecomponentfailure.
3.To preventany X-Radiationpossibility,itisessential
touse thespecified tube.
HOTCHECKCIRCUIT
a.c. VOLTMETER
WATERPIPE
(EARTH)
TOINSTRUMENT'S EXPOSED
METALLICPARTS Fig.1.
2k 10 Watts
2
