home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
World of Ham Radio 1997
/
WOHR97_AmSoft_(1997-02-01).iso
/
mods
/
radioshk
/
pro34_18.doc
< prev
next >
Wrap
Text File
|
1997-02-01
|
4KB
|
93 lines
To modify the Realistic Pro-34 200 channel hand held scanner
follow the directions below and good luck:
Items Needed:
Small soldering iron, plugged in of course...
Desoldering iron, also plugged in.
#0 Phillips screwdriver
Small flat blade screwdriver
Small diagonal cutters
Needle-nose pliers
3.57MHz crystal (Cat# 272-1310) from Radio Shack..
1. Remove the antenna, volume and squelch knobs.
2.Remove the battery cover and battery pack.
3. Remove the (4) small screws securing the back half of the
scanner. Remove back by lifting from the bottom first.
4. Once inside, remove the (4) hex nut posts that the back
screws screwed into. You may need to use the needle-nose
pliers to lossen the nuts.
5. Now using the desoldering iron, unsolder the two
connections from the antenna to the back circuit board.
Also unsolder the ground wire running from the frame to the
corner of the back board nearest the AC adaptor inputs.
6. Now unsolder the connections to the Volume control. I have
been successful by just taking the shaft nut off the volume
control, leaving the small wires alone.
7. Lift up on the back circuit board, unpluging it from the
front board. You may need a small flat blade screwdriver to
help pry up on it.
8. Now that the back circuit board is out of the way, remove the
3 screws holding the frame to the face of the Pro-34. Two of them
are on the topside, one is centered near the bottom, just above
the battery compartment. also remove two screws on the bottom of
the board inside the battery compartment.
9. With all that mess out of the way, you should now see the
circuit board just behind the front panel. Look for a small
square like blue component on the right side of the board. It
should be labeled on the board as (CX-1). That is a 2MHz ceramic
resonator. You want to replace that with the new crystal
(3.57MHz). To remove it, you need to unsolder it from behind the
board.
10. Remove the front circuit board. Behind it, there's a ground
plat with two holes. Each one has a wire coming through and
soldered to the plat.
11. Unsolder the two wires and bend them upright. Now you have
to unsolder the four corners of the plat, and one centered near
the bottom, just above the battery compartment.
12. Carefully lift the ground plat from the circuit board. You
may need to use the flat blade screw driver to pry it up.
13. Now you can locate and unsolder the three connections to the
resonator. (Theres allot going on behind that circuit board, so
take your time in locating the right pins to unsolder.) The
resonator should pull right off.
14. Now put the crystal in place and solder the connections (The
middle hole will be left empty). The crystal should lay flat on
the board so not to obstruct the reassembly of the scanner. It'll
be a tight fit, but it'll work.
15. Now assemble in reverse order. Don't forget to solder the
ground plat and antenna connections back, as well as the small
wires on the ground plat and near the power connection. Don't
worry about losing your pre-set channels, the battery pack can be
left out for some time before memory is lost. Just don't touch
the reset button!
The instructions above worked for me and many others, but
PC-Link, nor I will not be responsible for damage due to
change in design, soldering techniques, or other unforeseen
circumstances. The procedures above will probably void any
leftover warranty you may have.