Samsung HLRS078WX/XAA Service Manual page 6

Precaution
1-2 Servicing Precautions
Warning1: Firstcarefullyreadthe "Safety Instruction"in this servicemanual,
Whenthereis a conflictbetweenthe serviceand the safetyinstructions, f ollow the safetyinstructionat all times,
Warning2:Any electrolyticcapacitorwith the wrongpolaritywill explode,
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The serviceinstructionsare printedon the cabinet,and
shouldbe followedby any servicepersonnel,
Makesureto unplugtheAC powercordfrom the power
sourcebeforestartingany repairs,
(a) Removeor re-installpartsor assemblies,
(b) Disconnect t he electricplug or connector, i f any,
(c) Connectthe test partin parallelwith the electrolytic
capacitor.
Someparts are placedat a higher positionthan the
printedboard.Insulatedtubes or tapes are usedfor this
purpose.The internalwiringis clampedusing bucklesto
avoidcontactwith heat emittingparts,Theseparts are
installedbackto theiroriginalposition.
After the repair,make sureto checkif the screws,parts
or cablesare properlyinstalled.Makesure no damageis
causedto the repairedpartand its surroundings,
Checkfor insulationbetweenthe bladeof the AC plug
and that of anyconductivematerials(i,e, the metal
panel,inputterminal,earphonejack, etc),
6, InsulationCheckProcess:Unplugthe powercord from
theAC sourceand turnthe switchon. Connectthe insu-
latingresistancemeter (500v)to the AC plug blade,
The insulatingresistancebetweenthe blade of theAC
plug and that of the conductivematerialshouldbe more
than 1 M_,
7, Any B+interlockshouldnot be damaged,
If the metal heatsink is not properlyinstalled,no
connectionto theAC powershouldbe made,
,
Make surethe groundinglead of the testeris connected
to the chassisgroundbeforeconnectingto the positive
lead.The groundlead of the testershouldbe removed
last.
9, Bewareof risksof any currentleakagecoming into
contactwith the high-capacity capacitor,
10, The sharpedgesof the metal materialmay cause
physicaldamage,so ensurewearingprotective gloves
duringthe repair.
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