JBL TLX PS12, Руководство по обслуживанию

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Powered Subwoofer TLX PS12
pliers, gently heat and remove cut lead from
hole in edge or PCB.
Clean insulator and seating area on back of
panel. Coat both sides of insulator with silicon
(white) thermal compound (unless silicone
rubber pads are provided), position it centered
on back of device with holes aligned. Insert
leads into PCB then place pair over hole in
panel; ensure hole in insulator is aligned. Insert
screw from far side, pass shoulder bushing over
screw and carefully seat shoulder in hole in tab,
add flat washer, lock washer and nut (finger
tight). Center insulator tighten screw first then
solder all three leads in respective slots with full
fillet, being careful not to bridge pads. Use
ohmmeter to verify there is no short from tab of
transistor to panel, or between pads.
Never operate amplifier with load connected
when PC assembly is not attached to panel or
when any of output transistors is not properly
screwed to panel.
After repair, inspect for possible safety hazards,
including loose hardware, missing lock washers, correct
fuse and lead dress of primary wires (these must be held in
position with cable ties so that they cannot touch secondary
components).
With ohmmeter, check that panel is
connected to signal ground.
It is essential that the following safety insulation test be
performed prior to returning the Power Sub-Woofer to the
customer, using one of the following methods:
A) Insulation Resistance Test
With a 500VDC Insulation Tester, Check
insulation from the outer metal contact of the
RCA jack (chassis) to the line neutral of AC
cord. Resistance should be >100M
Ω
.
B) Hi-Pot Test
If a UL approved Hi-Pot tester is available, test
line & neutral of AC cord to outer shell of RCA
jack (chassis) at 1100VAC for 2 seconds.
Observe all of instrument manufacturer's
instructions and safety warnings in performing
this test.
Connect sub-woofer system to a music source. Play at
high level while checking for air leaks around panel edge,
driver, panel jacks and controls, and voice coil problems
such as rubbing or loose turns.
With the crossover
"frequency" set to 50Hz, very little of the voice content
should be heard.
4. LIST OF SAFETY COMPONENTS
REQUIRING EXACT REPLACEMENTS
F1 Fuse SLOW BLO 2.0A 250v GMC 20mm
UL approved.
FH Fuse holder. Use only factory
replacement.
PWR CORD SPT-2 better with polarized plug,
UL appoved wired with the hot side
to fused side. Use with UL approved
panel strain relief only.
XF transformer. use only factory
replacement.
BD1 Bridge diode. Use only factory
replacement.
C36, 37 6800uF, 63V electronic filter caps.
Be sure replacement part is at least the
same working voltage and capacitance
rating. Also the lead spacing is
important. Incorrect spacing may
cause premature failure due to internal
cabinet pressures and vibration.
K1 Safe operating area relay to protect
output devices. Use only factory
replacement.
R64 5.6
Ω
.5W METAL FILM, non flammable.