Service Bulletin
Service Bulletin INF2002-01 - February 2002
Warranty labor rate: MINOR repair
To:
All Infinity Service Centers
Model: Modulus MSW-1 Subwoofer
Subject: No Output
In the event you receive a Modulus MSW-1 subwoofer with the complaint: “There is no output, and the
LED on the volume control does not light, red or green”, check the items listed below:
Check the 3A line fuse to make sure it’s not open. If open, replace with a 3A MDL (.25 x 1.25) slo-blo fuse,
Infinity part# 80126.
Locate R22 in the power supply section, as shown below.
If value of R22 is not 100k ohms
±
5%, then replace R22 with a 1/2 Watt 100k ohm
±
5%, resistor.
1. Remove the grille. Lay the subwoofer on its face on a padded surface, amplifier facing upwards.
2. Remove the 10 Phillips screws around the outer perimeter of the amplifier faceplate; remove the amplifier
from the cabinet.
3. Remove two Phillips screws on the faceplate to remove the rear plastic cover; they are (1) the screw
directly above the Bass Optimization switch and (1) to the left of the power cord receptacle; remove the
amp cover.
4. Locate the power supply section and R22 from the illustrations below. R22 can be checked in-circuit and
should be 100k ohms
±
5%. If it is any other value, or open, replace with Infinity part# RC0082.
5. Reassemble the amplifier, rear cover, replace the amplifier in the cabinet and test the subwoofer.
13
Summary of Contents for Modulus MSW-1
Page 3: ...MSW 1 3 DETAILED SPECIFICATIONS ...
Page 4: ...MSW 1 4 DETAILED SPECIFICATIONS Cont ...
Page 5: ...MSW 1 5 CONTROLS ...
Page 6: ...MSW 1 6 CONNECTIONS ...
Page 10: ...MSW 1 10 PACKAGING 16 17 18 19 21 20 22 00533 24 23 ...
Page 20: ...MSW 1 20 300W HC BASH Power Supply 230V 120V Volume Right Board ...
Page 21: ...MSW 1 21 HC BASH 300W EM BOARD IL RABOS BOARD ...
Page 22: ...MSW 1 22 IL FEATURE BOARD HI LEVEL BOARD ...
Page 23: ...HC BASH 300W LINEAR BOARD MSW 1 23 ...
Page 32: ...MSW 1 32 LINEAR PCB ...
Page 33: ...MSW 1 33 VOLUME LC HI LEVEL OPTIONAL BALANCE 250W AC DC and EMI ...
Page 34: ...MSW 1 34 FEATURE MAIN BOARD ...
Page 35: ...MSW 1 35 FEATURE HOUSEKEEPING ...
Page 36: ...MSW 1 36 FEATURE RABOS ...
Page 37: ...MSW 1 37 POWER SUPPLY ...
