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6/22/2010
We have identified an intermittent issue with the charger sensor. Although the charger is working properly, the charger sensor may incorrectly display a charger failure. This should not affect the normal operation of the siren. Search on: UV 120816 H9 R68
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6/13/2003
If an extreme electrical noise environment is present, then this may cause the FCM controller board to reset. This modification, to improve the tolerance to noise, is only required if the controller is experiencing uninitiated resets.
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4/8/2003
If excessive voltage beyond the board specifications is input to JP5-4, then damage can occur. Service bulletin SB32 describes a prevention technique.
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9/25/2003
If the communication back porch is too long, or a time sync issue exists, the attached modification may resolve the issue.
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2/12/2007
Improvements have been made to the battery charger and charger leads for the previous and current DC sirens: 2001DC, DCFCB & DCFCT(B).
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9/29/2003
If the controller board has not transmitted recently, then the first transmission may be distorted. Transmission is within specifications by the third transmission. The attached modification will fix this issue.
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8/18/2003
If the DV digital voice volume is too low, or the quality is not sufficient, the attached modification may improve the volume and the quality of the recording.
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3/26/2003
If the battery voltage is high, and the driver load is low, then noise may be heard from the amplifier. UV
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3/25/2003
If new FCM controllers and UC/DC controllers are present together, then new software may be required to allow compatibility between both unit types.
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11/11/2002
Maintenance Reminder for 2001SRN Bulletin kit Q8402158A
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4/8/2010
We have identified a batch of regulator chips, which may cause the charger voltage to drift. Search on: DCFCTB DCFCB DCB charger 8402B073C 2001141 2001141B 2001141C
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11/11/2002
Service Bulletin 25: Federal Signal released an improved Dual Relay, 600 Ohm output board for the Informer. The board offers improved quieting for use with public address systems. DRSO IO
