Clear-Com SB-704 - Manual (Page 29)

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INTERNAL OPTION JUMPERS
There are several jumper options inside the chassis of the SB-704. To access
these options remove the top cover of the unit.
Note: Remove AC power from the unit before removing the top cover.
Note: This adjustment should only be carried out by qualified service
personnel.
The following options are available:
• IFB Operation Mode Select
• Run/Test Mode Jumper
• Power source selection for switchable intercom lines
• Program Audio Feed to Announce Output
IFB MODE
The SB-704 supports two different modes of operation for the internally
generated IFB function. J10 on the main PC board (in the lower left hand
corner of the board just behind the DIP switches) selects this mode. If an
interrupt enable DIP switch is enabled for a channel, the operation will be as
follows:
• LOCAL (Talk Function Activated): Jumper between Pins #1 and #2,
factory default. When a talk is active on the channel on which the interrupt
has been enabled, the program will be interrupted for the duration of the talk.
• REMOTE (Call Signal Activated): Jumper between pins #2 and #3. When
a call is received on the channel on which the interrupt has been enabled, the
program will be interrupted for the duration of the call signal on that channel.
To cause an interrupt of the program from this station a call signal must be
sent by pressing the call button or enabling the auto-call DIP switch option for
that channel and activating a talk on that channel.
RUN/TEST MODE JUMPER
The J2 jumper on the main printed circuit board allow a factory test mode to
be invoked and should never be used for normal intercom operation.
CAUTION: Do not move these jumpers. Moving these test jumpers may
cause the SB-704 not to operate. Possible damage to the product may result.
PROGRAM AUDIO FEED TO ANNOUNCE
OUTPUT JUMPER
J11 on the main board allows program audio to be fed to the announce output.
This is selected by setting jumper J11 to the on position. In this mode,
pressing the announce pushbutton turns off the program audio feed to the