30
DISASSEMBLY/ASSEMBLY PROCEDURES
the opening in the rear of the amplifier for
the ACM-1 module. Pin 1 is to the right.
This corresponds to the red stripe on the
ribbon cable.
26.2 Slide the ACM-1 module into the
chassis slot until the input module J2
connector is completely seated into the
I/O board two-pin harness connector.
The ACM-1 module should be flush with
the chassis back panel.
26.3 Secure the ACM-1 module to the
amplifier chassis by tightening two screws
(3) with a phillips-head screwdriver.
Note: Bose Equalizer PCBs can be
installed into both the standard Input
Module and the ACM-1 Amplifier Control
Module to allow active equalization of Bose
loudspeakers as used in various installa-
tions. For more information, refer to the
Equalizer PCB Assemblies service manual
part number 181812-S2 for the 402™,
502
®
A, 502B, 802
®
, 3202
®
, 4402
®
, 9702
®
and LT II loudspeakers, and service
manual part number 181812-S5 for the
Model 8 and Model 25/32 loudspeakers.
Note: Refer to Figure 11 for the following
procedures.
27. Equalizer PCB Installation and
Removal
27.1 Remove the Input Module or ACM-1,
as applicable, using procedure 23 or 25.
27.2 Located on the motherboard for the
module, you will see two jacks labelled J6
and J7. J6 corresponds to channel 1 of the
amplifier, and J7 corresponds to channel 2.
27.3 Plug the EQ card into the desired
channel. Be sure that it is firmly seated into
the connector. If you are removing an EQ
card, grip it firmly and gently pull it straight
out of the connector located on the module.
27.4 Replace the module using procedure
24 or 26, as applicable.
Note: The Bose
®
ACM-1 Amplifier Control
Module is used in place of the standard
Input Module to allow control and monitor-
ing of the amplifier by use of a control
network. It uses the same types of audio
input connectors as the standard Input
Module, as well as EQ outputs and se-
quence control. It will accommodate one
Bose EQ card for each channel. Refer to
the ACM-1 Amplifier Control Module service
manual part number 199746 for more
information.
Note: Refer to Figures 4, 10 and 11 for the
following procedures.
25. Bose ACM-1 Amplifier Control
Module Removal
25.1 Use a phillips-head screwdriver to
remove two screws (3) from the Bose
ACM-1 module (17) connector panel.
25.2 Pull the ACM-1 module out of the
chassis (2).
25.3 Disconnect the I/O board (6) ribbon
cable from the ACM-1 module J1
connector.
25.4 Disconnect the ACM-1 ribbon cable
from J2 on the amplifier I/O board.
25.5 Once the ACM-1 module is out of the
amplifier chassis the equalization cards can
be accessed.
26. Bose ACM-1 Amplifier Control
Module Replacement
26.1 Slide the ACM-1 module (17) into its
slot far enough so you can connect the
amplifier I/O board (6) ribbon cable into the
ACM-1 module J1 connector. Pin 1 is to the
right as you face the rear of the amplifier.
This corresponds to the red stripe on the
ribbon cable.
26.2 Connect the ACM-1 ribbon cable to J2
located on the amplifier I/O board.
This jack is located on the top right side of
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