SERVICE BULLETIN INF2000-02 - MARCH 2000
Warranty labor rate: MINOR repair
To: All Infinity Service Centers
Model: BU-80/HTS-10 (rev. "A,B")
Subject: Blowing fuses
Early versions of the BU80 subwoofer, if driven near maximum output for an extended period of time, may repeatedly blow the
internal line fuse.
In the event you receive a BU80 or HTS-10 subwoofer with the complaint “ no output ” or “ dead” , and fuse F1 (0.5A) is
blown, and has blown more than once in the past,* replace the following new parts:
F1: 1.0A 250v T type fuse, Infinity part# 80111
T1: Power transformer #4300F, Infinity part# 80127
Fuse Label, Infinity part# 80127A
After the part replacement, affix the new fuse label to the amplifier faceplate, covering up the former label.
CAUTION: All parts must be replaced at the same time; do NOT attempt to just replace original fuse F1 (0.5A) with the
new 1.0A rated fuse alone, without replacing original power transformer #4300.
* This bulletin defines “blown fuses” as: fuse F1 blowing when the unit is powered up and has played normally for several
minutes or more. If the unit is blowing fuse F1 instantly
upon power-up, chances are another problem is involved, and the
instructions in this bulletin will not help. For this condition, see Bulletins #INF9902, #INF2000-01, and obtain the
BU80/HTS-10 service manual.
Models Serial number 120/230V Status Action
BU80
HTS-10
#AM0011-29474 and below
#AM0011-07400 and below
Has blown F1 fuse
more than once.
Faceplate labeled 0.5A
Replace: F1 Fuse T1
Transformer Fuse Label
BU80
HTS-10
#AM0011-29475 and above
#AM0011-07401 and above
Changed by Factory
Faceplate labeled 1.0A
NONE REQUIRED
16
Amplifier/Subwoofer BU-80/HTS-10
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