Powered SubwooferARC SUB
pliers, gently heat and remove cut lead fromdriver, panel jacks and controls, and voice coil problems
hole in edge or PCB.such as rubbing or loose turns. With the crossover
"frequency" set to 50Hz, very little of the voice content
Clean insulator and seating area on back of
should be heard.
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. Insert4. LIST OF SAFETY COMPONENTS
leads into PCB then place pair over hole inREQUIRING EXACT REPLACEMENTS
panel; ensure hole in insulator is aligned. InsertF1Fuse SLOW BLO 1A 250v GMC
screw from far side, pass shoulder bushing over
screw and carefully seat shoulder in hole in tab,UL approved
add flat washer, lock washer and nut (fingerFHFuse holder. Use only factory
tight). Center insulator tighten screw first then
solder all three leads in respective slots with fullreplacement
fillet, being careful not to bridge pads. UsePWR CORD SPT-2 better with polarized plug,
ohmmeter to verify there is no short from tab of
UL appoved wired with the hot side
transistor to panel, or between pads.to fused side. Use with UL approved
panel strain relief only.
XFTransformer. Use only factory
replacement
Never operate amplifier with load connectedBD1Bridge diode. Use only factory
replacement.
when PC assembly is not attached to panel or
when any of output transistors is not properly
screwed to panel.C36, 374700uF, 50V electronic filter caps.
Be sure replacement part is at least the
After repair, inspect for possible safety hazards,same working voltage and capacitance
including loose hardware, missing lock washers, correctrating. Also the lead spacing is
fuse and lead dress of primary wires (these must be held inimportant. Incorrect spacing may
position with cable ties so that they cannot touch secondarycause premature failure due to internal
components). With ohmmeter, check that panel iscabinet pressures and vibration.
connected to signal ground.
K1Safe operating area relay to protect
output devices. Use only factory
replacement.
R645.6& .5W METAL FILM, non flammable
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&.
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,
6 |
ACEC
