17
The low level (1Vp‐p) audio output from the legacy controller to the local amplifiers must be
converted from an unbalanced signal to a balanced signal in order to pass the distortion
requirements for this configuration. This is accomplished by a new Isolation Transformer harness,
PN 0734‐231. If there is more than one amplifier on a channel, additional isolator harnesses must
be added between each link in the audio distribution. If the Legacy Controller uses two channel
audio, isolation harness’s will be required for the second channel. See Fig. 10:
LEGACY
AMPLIFIER
LEGACY
AMPLIFIER
MODE 1
MODE 2
4100U/4100ES MINIPLEX
TRANSPONDER
LEGACY MINIPLEX
TRANSPONDER
TO ADDITIONNAL
AMPLIFIERS
(IF REQUIRED)
NEW AUDIO
ISOLATOR
HARNESS
PN 734-231
NEW AUDIO
ISOLATOR
HARNESS
PN 734-231
NEW AUDIO
ISOLATOR
HARNESS
PN 734-231
EXISTING PRODUCT
742-302
AUDIO ISOLATOR
ASSEMBLY
ADDITIONAL
734-231 HARNESS
IF 2 CHANNELS
LEGACY
AUDIO
CONTROLLER
DASHED
LINES ARE
FOR CLASS A
OPERATION
4100-0620
BASIC TIC
(566-093)
OR 4100-0625
LOCAL
MODE TIC
(566-094)
4100-0621
ANALOG
AUDIO
RISER
(566-242)
4100-1210
ANALOG
AUDIO
CONTROLLER
(566-218)
TB1
RISER 1
110
RISER 2
SAA SAA
HARNESS
733-997
P3
P2
Node 1
Miniplex
Transponder
Node 1
Host Panel
TB1
RISER 1
110
RISER 2
S
SEC PRI SEC PRI
S
AUDIO BD
ASSY NO.
562-894
IN
TP6
C118
R90
R85
R88
PHONE TO
AUDIO
AUDIO OUTPUT 3AUDIO OUTPUT 2OUTPUT 1
OUT
SS
ISOLATOR
Figure 10. Amplifier and Harness Connections
Wiring,
Continued
Amplifier and
Harness
Connections
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