Xantech PA1235 Stereo Amplifier User Manual


 
®
13
Amplifiers & Preamplifiers
REMOTE MASTER
ON/OFF CONTROL
5-30 VOLTS DC
+--
COMMON BUS
LOCALLEFT RIGHT
STEREO
MONO
BRIDGED
CI
GROUND
STATUS
IR IN
LEFT RIGHT
SPEAKER
+-- --+
+
BRIDGED
--
2
COMMON BUS
LOCALLEFT RIGHT
STEREO
MONO
BRIDGED
CI
GROUND
STATAUS
IR IN
LEFT RIGHT
SPEAKER
+-- --+
+
BRIDGED
--
3
CAUTION
RISK OF ELECTRIC
SHOCK. DO NOT OPEN
MODE
MODE
5V to 12 VDC Adapter,
such as a Xantech 781RG,
plugged into a Switched
AC Outlet on Preamplifier
Preamplifier, Control Center, etc.
This
must
be the positive (+)
lead (white striped lead on
Xantech Power Supply Adapters).
PA1235
(portion of rear panel)
(+)
CAUTION:
You
must
use the included
220 resistor. See
CAUTION note above.
Fig. 9 Using the REMOTE MASTER ON/OFF
CONTROL Terminals
CAUTION: The output voltage of some adapters, such as the 781RG, drops off too slowly to provide
a quick turnoff for the PA1235. Therefore, when using
any
adapter (12 VDC max),
always
connect the
included 220 Ohm 1 Watt resistor in shunt with the REMOTE MASTER ON /OFF CONTROL terminals
as shown in Fig.9. Failure to do so may result in blowing of the power line fuse (item #10, Fig.3)
NOTE: Do not use the 220 Ohm resistor when connecting to the CO terminals of a ZPR68!
A Multi-Zone Power Managed System, using a ZPR68, a GATEKEEP-IR
and a PA1235
Fig. 11 shows a PA1235 in a typical multi-room system with a Xantech ZPR68-10 six-zone preamp and a
GATEKEEP-IR. The PA1235 has been designed specifically to work well with both Zone and All-Zone ON/
OFF management as rendered by the ZPR68-10.
In this example, the STATUS & GND output (0 to +12 VDC) of each zone of the ZPR68-10 is connected,
via a 2-conductor lead, to the CI & GROUND of each amplifier pair on the PA1235.
This causes the ON/OFF condition of any given ZPR68-10 Zone to turn it's corresponding amplifier pair
ON/OFF (Standby ON/OFF).
Also, the common CO (control output, 0 to +12 VDC ) from the ZPR68-10 is used to drive the REMOTE
MASTER ON/OFF CONTROL terminals of the PA1235.
CAUTION: When making this connection,
do not
use the included 220 Ohm resistor! Refer also to
CAUTION notes, Fig. 9.
When any one of the zones is turned ON, the common CO goes high (+12V), turning on power to the
entire PA1235.
Similarly, when the last zone is turned OFF, the CO drops to 0 V, turning the PA1235 totally OFF.
NOTE: No IR control of the PA1235 is used in the system shown in Fig. 11. All volume, mute, etc. functions
are handled by IR control of the ZPR68-10. The PA1235 amplifier pairs are all set to the default volume
level setting by pressing the LEVEL (System) RESET button (refer to item #9, Fig. 3).
AC Power Management of the entire system as shown in Fig. 11 is accomplished, therefore, as follows:
a) The PA1235 is controlled via the STATUS and CO functions as noted above.
b) The Source Components are controlled via the GATEKEEP-IR
sensor system and the IR macros in
the Smart Pads and, where used, IR macros in Learning Remotes (such as the Xantech URC types).
PA1235