7
Amplifiers & Preamplifiers
Refer to the INSTALLER INSTRUCTIONS that come with the RC68 for Code Group Setting
Procedures.
b) IR noise may be entering one or more of the IR receivers in the zones. This would interfere with
the proper recognition of the IR codes. Take steps to remove the IR noise or use Xantech IR
Receivers with high noise immunity (the CFL types).
c) Check to be sure the source components, amplifiers and speakers are connected and operating
correctly. Connect a source directly to one of the power amplifiers (bypassing the EXP9
completely) to verify operation of these components.
2. Most of the zones operate correctly, but one or two do not respond to the RC68 commands.
a) You may have inadvertently changed the IR Group Code on one or two of the zones during setup
procedures, or it was set incorrectly at the factory. Using the Code Group Setting Procedures that
come with the RC68, set the Code Group to 68 on the inoperative zone(s).
b) IR noise may be interfering with a particular zone. To correct, refer to 1. b) above.
3. Commands (such as Mute, Volume, etc.) sent to one zone will sometimes operate another zone
as well (IR signal crosstalk).
This may occur if you are running the IR bus leads of IR receivers or keypads for more than one zone
through a common shielded cable to the EXP9 Zone Control IR-Inputs. Capacitive coupling between
the signal conductors in the multiconductor shielded cable may be causing the crosstalk.
a) To correct this, you will need to run completely separate cables (home runs) for each room.
b) If it is not possible to run completely separate cables, or the source of the crosstalk cannot be
determined, you could change the IR Code Group of one or more of the zones to a different number.
The drawback to this solution is that you would need dedicated learning remotes (if used) for the
rooms having the different IR Code Groups.
4. I have two (or more) zone dedicated same-brand CD players (or other source components).
However, when I send commands to one of them, it operates the other(s) in the other zone(s)
as well. (Zone-to-zone IR crosstalk).
The IR output from the emitters connected to the Common IR Outputs (attached to the common
components, e.g. tape, VCR, tuner, etc.), may be radiating into the IR sensors of the zone dedicated
source components, if such components are placed in close proximity to each other. Crosstalk can
also occur if there is close proximity between the zone dedicated source components themselves.
a) Troubleshoot by unplugging the emitters one at a time. If you are using 282 emitters, be sure to
use the opaque shells and window masks that come packaged with them. This should stop stray
IR signals from bleeding over into the zones that have dedicated source components.
b) Use 283 emitters instead of the 282's. These have less output than the 282's and have been found
to be more effective even though opaque shells and window masks are not used with them.
5. The volume UP/DOWN commands must be repeatedly pressed to effect large changes in
volume level (will not ramp continuously).
a) IR noise may be entering one or more of the IR receivers in the zones. To correct, refer to 1. b)
above.
6. It seems that Global commands do not always affect all zones.
You may have allowed more than 5 seconds to elapse between commands after Global was initiated.
a) Be sure to execute the desired commands within 5 seconds of each other after the GLOBAL button
is pressed.
b) A good rule of thumb is to press GLOBAL each time just before executing global commands rather
than trying to guess whether 5 seconds has elapsed or not.
Note: See additional items under "INSTALLATION'.
EXP9
