CHAPTER 3
TRANSMIT, RECEIVE &AUDIO CIRCUIT,BOARDS
BTR-200 INSTRUMENT
DISASSEMBLY
o
1.
Remove6each #6 pan head phillips and 7each
#14 head phillips screws and remove cover.
Refer
to
Figure
8.
2.
Unsoldercoax cables from transmitand receive
boards.
3. Unsolder3copper strapsfrom receive board (if
present)
4.
Remove transmit and receive boards. Early
versions are equippedwith snap-on nylon stan-
doffs and later versions are held with #4 pan
head phillips screws.
5.
Remove ring nutsfrom the two RF connectors.
6. Remove the hex head nylon screw and nut
holding Q1
08
to the chassis.
7. Remove 8each #4 flat head phillips screws
holdingthe four XLRconnectorhousings
to
the
chassis. On some early versions, the upper
PEM nuts will be replaced with nuts and lock-
washers.
8.
Using an
XLR
tool
or
small
flat
bladed
screwdriver, unlock theXLR housings by turn-
ing the locking screw counterclockwise. Then
remove the
XLR
housings by pulling them to
the rear.
3-1
9.
Unplug the cable harness at
P1l4
and the two
ribbon cables atP102 and P103.
10.
Remove 10 each #6 pan head phillips screws
holding the circuit board
to
the chassis.
11.
Slide the circuit board forward and lift up and
outfrom the rear.
12. Remove 8each #6 pan head phillips screws
holding front panel
to
chassis.
13. Remove 2each #4 pan head phillips screws
holding headset connector bracket to chassis
and remove front panel.
14. Remove 7each phillips sorews holding front
circuit board to front panel and remove circuit
board. NOTE: When refitting this circuit
board the volume control on the front panel
must be positioned so that the pins and slots
mate properly.
15. Reassembly is the reverse
of
these procedures.