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Infinity Systems Inc. 250 Crossways Park Dr. Woodbury, New York 11797 (516) 496-3400
Service Bulletin
Service Bulletin INF2000-03 - October 2000 Warranty labor rate: MINOR repair
To: All Infinity Service Centers
Model: Basslink (version w/o AUTO-ON switch or REMOTE GAIN)
Subject: Unit will not turn off
In the event you receive a Basslink subwoofer with the complaint: “The unit will not turn off, even when
the audio signal is removed, and the Remote power connection is switched off” (indicated by the
Basslink’s red LED remaining ON), perform the following modification:
1) Set the unit on a padded surface and remove all external cables.
2) On the amplifier faceplate, remove only the (14) Phillips mounting screws as shown in Figure 1.
3) Remove the amplifier assembly from the enclosure. If the amp is turned around and supported correctly,
no other connectors need to be unplugged.
4) Add these two components:
1.0 Meg ohm 1/8W resistor, Infinity part# 299-1M
.01uf, 100v mylar capacitor, Infinity part# 140-PF2A103F
Solder these parts in parallel (See Figure 2); and attach to original location shown (See Figure 3), which is in
a narrow cavity between main power supply caps and transformer T101. There are two empty pads on the
PCB for these parts with marked designators R272 and C273.
5) New gaskets must be added to the amplifier mating surface; two pairs are required, four gaskets total:
Infinity part# 723D150 and #723C150
6) Replace the amplifier assembly and tighten all mounting screws. Use caution; a hand tool is
recommended to prevent stripping the threads in the enclosure.
7) Connect +12v to the unit and a signal cable, after the unit cycles ON, (red LED should be lit), remove the
signal and remote connection only (or shut off the music source if using the Universal Interface). Unit
should turn OFF after 3 - 10 minutes (as indicated by the red LED turning OFF).
Models Serial number Status Action
Basslink
All serial numbers affected
(version w/o AUTO-ON
switch or REMOTE GAIN)
The unit will not turn off when the
signal is removed, and Remote
connection is switched off
Add:
R272 1 Meg ohm 1/8W Resistor
C273 .01uf 100v Mylar Capacitor
New amplifier gaskets #723D150, 723C150
10