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CHAPTER 3
TRANSMIT, RECEIVE & AUDIO CIRCUIT,BOARDS
BTR-200 INSTRUMENT
DISASSEMBLY
o
1. Remove 6 each #6 pan head phillips and
7 each
#14 head phillips screws and remove cover.
Refer to Figure 8.
2. Unsolder coax cables from transmit and receive
boards.
3. Unsolder 3 copper straps from receive board (if
present)
4. Remove transmit and receive boards. Early
versions are equipped with snap-on nylon stan-
doffs and later versions are held with #4 pan
head phillips screws.
5. Remove ring nuts from the two RF connectors.
6. Remove the hex head nylon screw and nut
holding
Q
108 to the chassis.
7. Remove 8 each #4 flat head phillips screws
holding the four XLR connectorhousings 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 the XLR 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 at P102 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
out from the rear.
12. Remove 8 each #6 pan head phillips screws
holding front panel to chassis.
13. Remove 2 each #4 pan head phillips screws
holding headset connector bracket to chassis
and remove front panel.
14. Remove 7 each 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.
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