Service manual

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[TITLE]
OCTOBER 27, 2000
[PART NUMBER]
PX-600 Field Repair Guide Page 4
TROUBLESHOOTING
Basic Troubleshooting Steps
Problem Encountered Find the problem component solution
Keypad locked up - lights
come on but no
functions.
System locked up
Zone or system locks up
after ON button is
pressed.
Unplug (isolate) all keypad wires from
control unit and test unit functions
from front panel. Test each keypad
on system individually. Test using an
alternate KPS addressed for the
same zone.
Check all keypad connections. Set DIP switches for
correct zone, room, & system.
Insure data bus wires polarity.
Replace KPS Processor assembly.
Check front panel Volume knob is not rubbing on
Motor Pot bracket. Gently pull out knob 1/16
th
”.
Keypad has no functions
and no lights
On back panel of head unit. Check
bus fuse - Use ohmmeter to measure
for 0 ohms. Check bus voltage -Use
voltmeter across pin 1 & 4 – DC
voltage is unregulated and should be
between 8 – 14 volts DC.
Replace bus fuse w/ 1.5 A slo-blo
Check data bus wires polarity.
Replace KPS Processor assembly.
Slow reaction time from
keypad, front panel or
RT-A remote.
Check KPS terminator switch.
Check wire terminations.
Check for IR interference (Ambient
light source)
Change to opposite direction and test system speed.
Make sure there are no cut or frayed wires and that
there are no intermittent shorts in wiring.
Disable IR on keypad - DIP switch 9 UP.
Keypad turns on but
there is Audio in the
wrong zone or more than
one zone.
This usually indicates the wrong zone
or system address on the KPS
keypad -
Preamp output is connected to the
wrong channels on the amplifier.
Check DIP switch address settings and make sure
the proper zone and system codes are set.
Change wiring to correct amplifier input.
Keypad turns on but
there is Audio in more
than one zone.
All on group is active.
Check PX-600 back panel outputs
Test Zone again but do not issue a press and hold
command at turn on from keypad.
Variable audio comes out of the preamp section and
NOT the zone outputs. All zone outputs become HOT
when any zone is active.
No Audio in one zone
Identify Zone
What type of Amp is powering this
zone? Is it signal sensing turn on/off?
Check Speaker continuity.
Check Preamp output.
Check amp inputs –
Check Fuse
Source dependent? - Check source
input continuity and line level signal.
Turn all zones off but the problem zone. Use the Zone
or Room command to find out which zone is active.
Is there preamp line level signal. If so, check amp
channel.
Replace fuse with same value. Fuses.
Change source or it’s wiring connection.
No Audio in any zone Amplifier ON? Insure AC power to Amp. Is not switched unless
system is designed to use current amp in this fashion.