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S E R V I C E M A N U A L
ARC SUB
Discrete Output, High Current
8" Powered Subwoofer
JBL Consumer Products Inc.
250 Crossways Park Drive
Woodbury, N.Y. 11797
A Harman International Company
1112-ARCSUB Rev A 4/98
Powered Subwoofer ARC SUB
TABLE OF CONTENTS
Specifications .................................................................1 Block Diagram ................................................................7
Warranty .........................................................................2 Amplifier Exploded View ................................................8
Safety Symbols ..............................................................2 Cabinet Exploded View..................................................9
Controls and Their Functions.........................................3 Parts Lists.....................................................................10
Test Procedures .............................................................4 Packaging and Shipping ..............................................12
Trouble Shooting Before Opening .................................5 Integrated Circuit Diagrams .........................................13
Removing the Amplifier..................................................5 Printed Circuit Boards .................................................14
Trouble Shooting After Removal ...................................5 Schematic Diagrams ...................................................16
Components Requiring Exact Replacement..................6
SPECIFICATIONS
Amplifier Power RMS . . . . . . . . . . . 75 Watts
Drivers . . . . . . . . . . . . . . . . 8" with high-polymer-laminated cones
Inputs . . . . . . . . . . . . . . . . Line level and High Level
Outputs* . . . . . . . . . . . . . . . High level with High-Pass filter at 180Hz
Crossover Frequency . . . . . . . . . . . 50-150Hz
(continuosly variable)
Frequency Response . . . . . . . . . . . 45Hz to (50 - 150Hz)
(determined by crossover setting)
External Dimensions (Inches)
Height . . . . . . . . . . . . . . . . 9 1/4"
Width . . . . . . . . . . . . . . . . 14"
Depth . . . . . . . . . . . . . . . . 12 1/2"
Weight . . . . . . . . . . . . . . . . 23 lbs
External Dimensions (mm)
Height . . . . . . . . . . . . . . . . 235 mm
Width . . . . . . . . . . . . . . . . 356 mm
Depth . . . . . . . . . . . . . . . . 318 mm
Weight . . . . . . . . . . . . . . . . 10.5 kg
* High-Level (speaker) outputs are active only if high-level input are used.
Occasional refinements may be made to existing products without notice, but will always meet or exceed
original specifications unless otherwise stated.
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WARRANTY
This amplifier is warranted against defects in material LIMITATION OF WARRANTY
and workmanship for a period of 90 days from date of
The foregoing warranty shall not apply to defects
shipment, when installed in accordance with the owner's
resulting from improper or inadequate maintenance by
manual in a clean, dry, interior home environment. THIS
Buyer, Buyer-supplied interfacing, unauthorized
AMPLIFIER IS NOT SUITABLE FOR OPERATION
modification or misuse, operation outside of the
OUTSIDE OR IN HARSH ENVIRONMENTS. During the
environment specifications for the product including
warranty period, the manufacturer will, at its option, either
inadequate ventilation, or improper site preparation,
repair of replace products which prove to be defective.
installation, or maintenance.
For warranty service or repair, this product must be
NO OTHER WARRANTY IS EXPRESSED OR
properly packed and returned to a service facility
IMPLIED. THE MANUFACTURER SPECIFICALLY
designated by the manufacturer. Buyer shall prepay
DISCLAIMS THE IMPLIED WARRANTIES OF
shipping charges to the designated facility and the
MERCHANTABILITY AND FITNESS FOR A PARTICULAR
manufacturer shall pay shipping charges to return the
PURPOSE.
product to buyer. However, Buyer shall pay all shipping
charges, duties and taxes for products returned to the
manufacturer from another country.
EXCLUSIVE REMEDIES
The manufacturer does not warrant that the operation of THE REMEDIES PROVIDED HEREIN ARE BUYER'S
the product will be uninterrupted or error-free. The Buyer SOLE AND EXCLUSIVE REMEDIES. THE
must determine the suitability of the product for his or her MANUFACTURER SHALL NOT BE LIABLE FOR ANY
purposes. DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, WHETHER BASED ON
CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.
SAFETY SYMBOLS
The following symbols are used throughout this manual WARNING sign until the indicated conditions are fully
and in the product. Familiarize yourself with each of the understood and met.
symbols and its meaning before servicing this amplifier.
Instruction manual symbol. The product will be GENERAL SAFETY CONSIDERATIONS
marked with this symbol when it is necessary for
the user to refer to the instruction manual in order THIS UNIT DOES NOT HAVE A POWER SWITCH;
to protect the unit against damage.
Indicates dangerous voltages are present. Be
extremely careful.
HAZARDOUS VOLTAGES ARE PRESENT WITHIN THE
The CAUTION sign denoted a UNIT WHENEVER IT IS PLUGGED IN. This still applies
hazard. It calls attention to a when the over-temperature thermostat opens, as it may
procedure which, if not correctly automatically reset at any time.
performed or adhered to, could
result in damage to or destruction of the amplifier. Do not
proceed beyond a CAUTION sign until the indicated
conditions are fully understood and met.
There are voltages and hot components at many points
The WARNING sign denotes a in the amplifier which can, if contacted, cause serious injury.
hazard. It calls attention to a Be extremely careful. Any adjustments or service
procedure which, if not correctly procedures that require operation of the amplifier out of its
performed or adhered to could enclosure should be performed only by trained service
result in injury or loss of life. Do not proceed beyond a personnel.
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CONTROLS AND THEIR FUNCTION
1. Output Level - The Output Level adjustment 4. Low Level Input - These left and right Line Level
determines volume level strength. Inputs are normally used when the
receiver/processor has line-level "pre-amp out "
2. Crossover Frequency - The Crossover Frequency or "subwoofer out" jacks.
adjustment determines the highest frequency the
ARC SUB will reproduce. It allows a seamless 5. Fuse - Use only a slow-blo 1.0A 250V GMC fuse.
transition from the subwoofer to the satellite
speakers. 6. High Level Inputs - These High Level Inputs are for
receivers that do not have line-level "pre-amp out"
3. On (LED) - This LED will light green when the unit is or "subwoofer out" jacks. When a pair of main or
plugged in and is receiving signal. When in satellite speakers are attached to the OUTPUT
standby mode the LED is red. terminals, frequencies below 180 Hz are attenuated
by the high-pass filter.
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TEST PROCEDURES
General Function
UUT = Unit Under Test
1. Connect both right and left line level inputs (RCA) to signal generator and UUT. Use Y-cable if necessary from
mono source. VOLUME control should be full counterclockwise.
2. Turn on generator, adjust to 50mV, 50 Hz.
3. Plug in UUT; red LED should be ON. Turn VOLUME control full clockwise.
4. LED should turn Green; immediate bass response should be heard and felt from port tube opening.
5. Turn off generator, turn VOLUME control fully counterclockwise, disconnect RCA cables.
6. Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected to
an integrated amplifier fed by the signal generator.
7. Turn on generator and adjust so that speaker level output is 2.0V, 50 Hz. Turn VOLUME control full clockwise.
8. Green LED should light, immediate bass response should be heard and felt from the port tube opening.
Sweep Function
1. Follow steps 1-4 above, using a sweep generator as a signal source.
2. Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any
other noises. If any unusual noises are heard, remove driver and test.
Driver Function
1. Remove driver from cabinet; detach + and - wire clips.
2. Check DC resistance of driver; it should be 3.0 ohms.
3. Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by
a signal generator and adjust so that speaker level output is 5.0V.
4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
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BEFORE THIS AMPLIFIER IS PLUGGED IN, make sure its rated voltage corresponds to the voltage of the AC power
source to be employed. Failure to use the correct voltage could cause damage to the amplifier when the AC power cable is
plugged in. Do not exceed the rated voltage by more than 10%; operation below 90% will degrade performance or cause the
unit to shut off.
1. TROUBLE SHOOTING BEFORE OPENING
Check connections, control settings, driver and other
possible external problems. If there is Output, determine if
all controls and Inputs function properly. Rotate Pots over If line core, its strain relief, or the AC switch are
full range while applying lateral and vertical oscillating replaced, it is necessary to seal them completely to panel
forces to locate possible intermittent function. High Level with an approved conformal coating to prevent air
Inputs should be tested individually both differentially "whistling" through any openings from woofer pressure.
(signal from "-" to "+" with normal output) and in common
mode (signal from low level ground to both "+" and "-"
shorted together, giving virtually no output). While passing
a signal, corner drop the enclosure a few inches to expose
possible intermittent problems. Check woofer for rubbing of
voice coil or tears in cone or surround. Check cabinet for To reduce the risk or electric shock and/or
loose extraneous articles which may have been pushed fire, replace items as marked on schematic
into front port. with the safety marking only with the exact
replacements listed in the safety component
list, section 5. If exact replacements are not available,
order them from the factory or an authorized service center.
2. REMOVING THE AMPLIFIER.
A.) Check fuse F1. If blown visually check transformer
for discoloration, and large capacitors (C36, C37) for
bulges or venting. Check for shorts in Q3-Q7 with
There are voltages and hot components at many points an Ohmmeter, (see schematic).
in the amplifier which can, if contacted, cause personal
injury. Be extremely careful. Any adjustments or service B. With ohmmeter, verify contacts of thermostat are
procedures that require operation of the amplifier out of its closed, voice coil of woofer is 3.0 ohms, and
enclosure should be performed only by trained service windings of transformer are continuous.
personnel. Refer to PCB drawings for locations of hazards C. Examine board and wiring for obvious damage,
and familiarize yourself with their locations before starting. broken or poorly soldered connections, or
discoloration.
3. TROUBLE SHOOTING AFTER REMOVAL D. Repair or replace items identified above. Procedures
for replacing power transistors and removing PCB
are as follows:
Verify AC plug is disconnected. See WARNINGS in
section 2.
Use low power, grounded temperature regulated iron
with small tip such as Weller PTA7 and ESD control.
Use SN63/37 solder 0.032" diameter with "no clean"
flux core, Alpha Metals P2 or equal.
To prevent loose hardware from reducing safety I) Replacing power transistors: Clip all 3 leads
spacings, it is essential that all hardware be replaced in the near body of transistor. Remove screw and
same manner as it was removed, with lock washers under discard device (keep hardware and insulator).
all nuts, proper torque on screws and thread locking sealer Holding each lead in turn with needle nose
on the transformer nuts.
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pliers, gently heat and remove cut lead from driver, 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. Insert 4. LIST OF SAFETY COMPONENTS
leads into PCB then place pair over hole in REQUIRING EXACT REPLACEMENTS
panel; ensure hole in insulator is aligned. Insert
screw from far side, pass shoulder bushing over F1 Fuse SLOW BLO 1A 250v GMC
screw and carefully seat shoulder in hole in tab, UL approved
add flat washer, lock washer and nut (finger
FH Fuse holder. Use only factory
tight). Center insulator tighten screw first then
replacement
solder all three leads in respective slots with full
fillet, being careful not to bridge pads. Use PWR 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.
XF Transformer. Use only factory
replacement
Never operate amplifier with load connected BD1 Bridge diode. Use only factory
when PC assembly is not attached to panel or replacement.
when any of output transistors is not properly
C36, 37 4700uF, 50V electronic filter caps.
screwed to panel.
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, correct rating. Also the lead spacing is
fuse and lead dress of primary wires (these must be held in important. Incorrect spacing may
position with cable ties so that they cannot touch secondary cause premature failure due to internal
components). With ohmmeter, check that panel is cabinet pressures and vibration.
connected to signal ground.
K1 Safe operating area relay to protect
output devices. Use only factory
replacement.
R64 5.6 .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,
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ARC SUB AMPLIFIER BLOCK DIAGRAM
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AMPLIFIER EXPLODED VIEW
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CABINET EXPLODED VIEW
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ARC SUB PARTS LISTS
ELECTRICAL PARTS LIST
Ref. Number Part Number Description Quantity
Ref. Number Part Number Description Quantity R32 084392503 3.9K CF 1/4W 1
R33 086224502 220K 1/4W 10mm 1
Capacitors R34 086102502 1K CF 1/4W 10mm 1
C1, 2 130001529 100UF 100V NP 2 R38 084102503 1K CF 1/4W 1
C3, 4 130000557 4.7UF 16V 2 R39 084470503 47 CF 1/4W 1
C5, 6 135100811 100PF CERAMIC 2 R40 084103503 10K CF 1/4W 1
C7, 11 130000627 0.015UF 5% MYLAR 2 R41 084275503 2.7M CF 1/4W 1
C8 135020811 20PF CERAMIC 1 R42, 43 084332503 3.3K CF 1/4W 2
C9, 10 130000627 0.015UF MYLAR 2 R44 086752502 7.5K CF 1/4W 1
C12 130048607 0.1UF 16V 1 R45 084104503 100K CF 1/4W 1
C13 13000610 0.001UF MYLAR 1 R46 084102503 1K CF 1/4W 1
C14 130048604 0.68UF 16V 1
R47, 50 084223503 22K 1/4W 2
C15 130000620 0.033UF 5% MYLAR 1
R48 084911502 910 1/4W 1
C16 130000628 0.0039UF 5% MYLAR 1
R49, 51 084102503 1K CF 1/4W 2
C17, 26 130048605 0.33UF 16V 2
R52, 53 084392503 3.9K CF 1/4W 2
C18 130000639 0.0056UF 5% MYLAR 1
R54 084272503 2.7K CF 1/4W 2
C19 130000610 0.001UF 5% MYLAR 1
R55 084182503 1.8K CF 1/4W 10MM 1
C20 130000596 0.22UF 16V 1
R56, 57 091681502 680 MF 1W 2
C21 135470811 470PF CERAMIC 1
R58, 59 084470503 47 CF 1/4W 2
C22 130054710 100UF 16V 1
R60, 61 084220503 22 CF 1/4W 10MM 2
C23 132104652 0.1UF CERAMIC 1
R62, 63 092158502 0.15 MF 2W 2
C24 130000551 1000UF 25V 1
R64 095569502 5.6 MF 1/2W 1
C25 130000527 4.7UF 16V 1
R65 084104503 100K CF 1/4W 1
C27, 28, 29 130000518 100UF 25V 3
R66 084472503 4.7K CF 1/4W 10MM 1
C30 130000622 0.01UF MYLAR 5% 1
R67 084223503 22K CF 1/4W 1
C31 130000619 0.047UF MYLAR 5% 1
R68 084561503 560 CF 1/4W 1
C32 135022811 22PF CERAMIC 1
R69 084153503 15K CF 1/4W 1
C33 130000506 10UF 16V 1
R70 084562503 5.6K CF 1/4W 10MM 1
C34, 35 130000549 220UF 25V 2
R71 084472503 4.7K CF 1/4W 10MM 1
C36, 37 130001530 4700UF 50V 2
R72 105681502 680 MF 5W 1
Resistors R73 092511502 510 MF 2W 1
R1, 2, 3, 4 092101502 100 MF 2W 4 R74 092331502 680 MF 2W 1
R5, 6 084274503 270K CF 1/4W 2
Diodes
R7, 8 086472502 4.7K CF 1/4W 10MM 2
BD1 240184801 DIODE BRIDGE RS402L/KBL01 1
R9, 10 084473503 47K CF 1/4W 10MM 2
D1, 2, 3, 4 240002605 DIODE IN4148 4
R11, 12 084333503 33K CF 1/4W 2
ZD1, 2 240224101 ZENER IN5231B 2
R13, 14 086473502 47K 1/4W 10MM 2
ZD3, 4, 5, 6 240221701 ZENER IN4744A 15V 1W 4
R15, 16 086102502 1K CF 1/4W 10MM 2
ZD7 240094701 ZENER 24V 1/2W 1
R17, 18 073893582 379K MF 1/16W 1% 2
R19 072325182 23.25K MF 1/16W 1% 1 Transistors
R20 086625502 2.2M MF 1/4W 10mm 1 Q1 230154501 2SC1815GR 1
R21, 22 079303582 930K MF 1/16W 1% 2 Q2 230164501 2SA1015GR 1
R23 071415282 141.5K MF 1/16W 1% 1 Q3 230201201 MPSA06 1
R24 077382582 73.8K MF 1/16W 1% 1 Q4 230175901 2SD1563 1
R25 071475282 147.5K MF 1/16W 1% 1 Q5 230175801 2SB1086-Q 1
R26 073203582 320K MF 1/16W 1% 1 Q6 220036001 2SB668-R 1
R27 071603582 160K MF 1/16W 1% 1 Q7 230035901 2SD718-R 1
R28 073203582 320K MF 1/16W 1% 1 Q8, 10 230154501 2SC1815GR 2
R29, 30, 31, 084103503 10K CF 1/4W 6 Q9 230164501 2SA1015GR 1
35, 36, 37 Q11 230078101 2SC2274 1
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Ref. Number Part Number Description Quantity Ref. Number Part Number Description Quantity
Integrated Circuits
U1, 2, 3, 4, 5 220214601 IC 4558L DUAL OP AMP 5
PACKAGING PARTS LIST
U6 220013602 IC 4558D DUAL OP AMP 1
101125 STYROCORNERS 8
Fuse
101540 POLY BAG 1
F1 290205101 FUSE SLOW-BLO T1.0A 250V 1
101520 BEAUTY CARTON 1
Miscellaneous 76082 WARRANTY CARD 1
K1 200222501 RELAY 24V 6A 1 101530 SET-UP GUIDE 1
4 150226401 TRANSFORMER 8410193F 1 101145 BOTTOM PADS 1
8 260231001 CONNECTOR SPEAKER 2
TERMINALS
VR1 120215401 VR1 500K x 2 Frequency 1
VR2 120211501 VR2 20K X 2 Volume 1
LED1 250213501 LED BRG333B(R/G) 1
NOTE: This caution sign is found by components in which safety can be
12 260231802 CONN DUAL RCA INPUT 1 of special significance. When replacing a component identified with the
15 260232901 FUSE HOLDER 1 sign replace only with same ratin
25 210213601 POWER CORD 1
MECHANICAL PARTS LIST
Ref. Number Part Number Description Quantity
1 NOT SOLD PRE-AMP PCB ASSY. 1
2 NOT SOLD POWER AMP PCB ASSY. 1
3 550101000 HEATSINK 1
5 NOT SOLD PCB INSULATOR FOAM BEZEL 1
6 NOT SOLD FOAM INSULATION TAPE 1
7 510112501 FACEPLATE 1
14 530041500 KNOB 2
16 550087300 STRAIN RELIEF 1
18 540083200 "L" BRACKETS 2
19 560031601 HEATSINK FOR Q4 &Q5 2
20 STPP43007 SELF TAPPING SCREW 2
21 SMPP330W6 TAPPING SCREWS 4
22 S2PP43010 SELF TAPPING SCREWS 4
23 SMPP440W9 MACHINE SCREW 4
24 320008400 O/P TRANSISTOR MICA PAD 2
26 NH0H54000 NUT 4
27 WS4426600 SPRING WASHER 4
28 WF5411010 FLAT WASHER 4
29 SMPP440W7 MACHINE SCREW 2
101510 GRILLE 1
101142 SCREWS (FOR WOOFER) 4
101500 8" WOOFER 1
101141 SCREWS (FOR REAR PLATE) 10
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PACKAGING EXPLODED VIEW
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INTEGRATE CIRCUIT DIAGRAMS
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PREAMP PRINTED CIRCUIT BOARD (TOP VIEW)
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POWER AMP PRINTED CIRCUIT BOARD (TOP VIEW)
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SCHEMATIC DIAGRAM 1
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SCHEMATIC DIAGRAM 2
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