AR5000 OPERATING MANUAL PAGE 69
3 Pull the PCB towards the front panel and lift it as shown
in the diagram.
4 Locate position MF1 on the I.F. PCB (refer to illustration).
The position is currently unoccupied ready for the optional
500 Hz Collins mechanical filter. Use a desoldering pump
to remove any excess solder from the respective pin
positions. Insert the CW filter into the cleared holes of the
PCB and securely solder its pins - don’t overheat the filter!
5 Refit the I.F. PCB making sure that all six screws have
been refitted.
6 Refit the upper case... you may wish to do this once
you have established that the filter is operating correctly!
7 The optional 500 Hz filter must be REGISTERED in
the receiver’s configuration before it will appear on the IF
bandwidth display and be used. Plug in the power cord
and ensure that the supply is connected and active.
Assuming that power is connected to the AR5000 and
the power switch is currently OFF, press and hold
key then power up the receiver by pressing and
releasing the
switch while still holding the
key. Now release the
key. The 0.5 kHz (500 Hz)
bandwidth will now be available for use.
17-2 Installation of other filters
Consult your AOR dealer if you wish to install other filters
such as 2.5 kHz and 5.5 kHz. To add these substitute
filters, the standard ceramic filters must be replaced, this
requires good quality tools and technical skill. Use of an
electric desoldering pump and professional grade
soldering iron is highly recommended.
Never try to remove the standard fitted ceramic filters
by force, such an attempt may damage the printed circuit
board (high quality multiple layers) invalidating the
warranty.
Note: The LCD legends will still display 3.0 kHz and 6.0
kHz even when substitute 2.5 kHz and 5.5 kHz Collins
optional filters have been fitted.
1 In order to lift the upper case, carefully (with the correct
fitting posi-drive screwdriver) remove the 4 screws from
the top cabinet and the 3 screws from each side panel
(the screws on the side of the unit toward the front are
larger than the rest). The rear edge of the top cabinet
has a flange and the sides have two unused holes (for
mobile mounting).
2 On the top-rearmost PCB (I.F. board), disconnect the
IF OUT connector J8 (PCB side) from the socket on the
rear-left of this board and remove the six board fixing
screws.
3 Pull the PCB towards the front panel and lift it as shown
in the diagram.
4 Remove the standard fitted filter:
CF1 2.4 kHz ceramic filter (front panel legend 3.0
kHz) from position MF2 to fit the 2.5 kHz optional
Collins mechanical filter.
CF3 9.0 kHz ceramic filter (front panel legend 6.0
kHz) from position MF3 to fit the 5.5 kHz optional
Collins mechanical filter.
Note: CF2 & CF4 cannot be replaced.
5 Locate the pin holes designed to accept the Collins
Mechanical filter, and remove excess solder contents from
the holes by using a desoldering pump.
6 Insert the optional filter into the cleared holes of the
PCB and securely solder its pins - don’t overheat the filter!
7 Locate the unused component pads close to the newly
soldered filter pins (on the underside of the PCB). Two
ZERO OHM resistors (or wire jump leads) have to be
soldered to form a bridge linking the pads together
(resistors not supplied).
8 Refit the upper case... you may wish to do this once
you have established that the filter is operating correctly!
Nothing further is required.
