Audioaccess PX-603, Предварительное руководство по обслуживанию

Страница: 36 / 68

[logo]
[TITLE]
MARCH 9, 2000
[PART NUMBER]
Audioaccess Trouble Shooting Page 6
I = Front Panel is receiving IR.
K = Information from A keypad is
being received at head unit. Either a
button press or receiving IR.
P = head unit is send IR to sources. the IR receiver.
Front Panel LCD (MRX)
has no font LCD intensity potentiometer needs
adjustment. Remove the top cover of the MRX and
find the small hole directly behind and to
the right of the LCD screen. Use a small
#1 blade screwdriver to gently move the
potentiometer till the font is visible on
the LCD screen.
Front Panel LCD (MRX)
has no back light or is
split Check ribbon connections to front
panel. Make sure there is a complete
connection and there are no shorted
wires inside the MRX chassis.
Programmer LCD (PX-
600) has no font LCD intensity potentiometer needs
adjustment. Remove the top cover of the
programmer and find the only
potentiometer on this circuit. Use a
small #1 blade screwdriver to gently
move the potentiometer till the font is
visible on the LCD screen.
Programmer LCD (PX-
600) has no back light or
is split Check ribbon connections to front
panel Make sure there is a complete
connection and there are no shorted
wires or broken connectors.
Characters remain on
LCD after back light goes
off. After PX-connect or MRX-connect
this is normal. If this happens at any other time call
Customer Support
Tuner frequency
displayed on LCD (MRX)
does not match station
being listed to. Check that tuner set up is set for US
standards. US frequencies should be set at .2MHz.
Use the tuner preset button 1 and
MUTE to activate main menu.
PX-600 or MRX
constantly resets. Remove keypads.
If the problem still exists then it is an
RS-485 Transceiver failure.
If the problem stops then look for
failed RS-485 transceivers on
keypads. Test from front panel.
Change RS-485 Transceiver.
Put one Keypad on the data bus at a
time until the bad keypad is found.
Replace KPS processor board or entire
keypad.
MRX Overheats Does the fan run?
Is the unit installed in cabinet w/no
ventilation? Remove cover and find the power wire
to the fan. Use a multi meter to see if
the fan’s windings are still in tact. NO-
replace fan.
Ventilate cabinet.
PX-600 Overheats Is the unit installed in cabinet w/no
ventilation? Ventilate cabinet.
MRX main fuse blown
PX-600 main fuse blown
Check for shorted wiring.
Check for source input DC offset.
Check correct wall voltage. Repair faulty wiring.
Change or repair source.
Connect to 110VAC.
No power on MRX
switched outlets. Does the AC relay click on power
up? Change relay.