Infinity Systems Inc. 250 Crossways Park Dr. Woodbury, New York 11797 (516) 496-3400
1
Service Bulletin
Service Bulletin INF2002-06 Rev3 - November 2002 Warranty labor rate: MAJOR repair
To: All Infinity Service Centers
Model: Modulus Subwoofer MSW-1
Subject: Reliability Upgrade
PURPOSE: Improve reliability of the Modulus MSW-1 subwoofer amplifier; this procedure should be
followed for every unit that has to be serviced, for any reason.
PLEASE READ FIRST BEFORE ORDERING PARTS OR SERVICING THE AMPLIFIER.
ORDER PARTS ON AS NEEDED BASIS ONLY
IR = Brand International Rectifier A/R = As required
Infinity Part
Number
Ref.
Designator
Description Qty Comment
QM0061 Q1 MOSFET, IRF540 TO220AB IR ONLY 1
QM0055 Q4,Q5 MOSFET, IRF740 TO220AB IR ONLY 2
TS0016 TUBING, #5 BLACK CUT TO .3 A/R
DR0091 D1
RECT, 15A 200V MUR1540
MOTOROLA ONLY
1
Substitute for
DR0087 if not
MOTOROLA
810066
HEATSINK, FET CLIP, CLIP ON - NO
SCREW
2
Used with heatsink
810156 on U2,U3
810156 HEATSINK, LINEAR VOLTAGE REG 1
810157 HEATSINK, FET SEC BLACK 1 Replaces 810091
810158 HEATSINK, FET PRIMARY BLACK 1 Replaces 810092
810056 HEATSINK, FET CLIP .9 x .5 x .2 1 Use with Q1
MS0017
MISC, CERAMIC PLATE TO-220,
CERAMIC INSULATOR 0.025
5 Use with Q1,3,4,7,8
Thermal grease A/R
Use with
Q1,3,4,5,7,8, D1,D3
RM0002 R43 RES, MF 10K0 1/4W 1% 1
KS0027 50 DEGREE PTC THERMISTOR 1
RTV DOW CORNING 747 OR
EQUIVALENT
A/R
CE0145 C6 CAP, E 1000uF 100V 18 x 40 105C 1
To replace 85 deg.
part
TS0009 HEATSHIRK TUB. 1/16” DIA. A/R For KS0026 leads
The repair procedure is to be executed in 3 phases.
1) POWER SUPPLY BOARD UPGRADE - STEPS CORRESPOND WITH FIGURE 1
Step OPERATION
1.
Q1 - This part must be IR only. Replace with QM0061, MOSFET, IRF540 TO220AB IR if needed.
Use TUBING, #5 BLACK cut to .3 (TS0016) to set mounting height to 0.3”.
2.
Q4,Q5. These parts must be IR ONLY. Replace with MOSFET, IRF740 TO220AB IR (QM0055).
Q4 and Q5 must have black tubing on component leads: TUBING, #5 BLACK cut to .3 Inch in
length (TS0016) or equivalent.
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