Receive Board - Telex Radiocom BTR-200 Series Service Manual

Rev C boards can be either Verion 3 or 4. The
differences are all parts values:
Rev D boards are all version 5.
Rev E boards are all version 6.
Rev B was not produced.
750309 COMP REV A
Version
RIOI RI03 Rl25 Rl30 Rl31 Rl32 Rl33 Rl54 Rl62 Rl68 Rl70 Cl33
3
82K 82K
6.2K 1.5K
1.5K 1.5K
1.5K 5.6K 9.lK 68K 68K
lO~F
4 200K 200K 4.7K 4.7K 4.7K 4.7K 4.7 8.2K 3.9K 15K 10K
22~F
RECEIVE BOARD
The BTR-200 uses one of two receive boards.
Figure 6
Location of Rev Level for Versions 1 and 2
Early production units came with 70714000, and
750309 was installed in later units. 70714000
came in two versions that differed slightly (See
table below):
Version 2 was built only with Rev C boards.
Version 1 was built with Rev A, B, or C boards.
The different revisions on this board were manufac-
turing changes that did not change the schematic.
750309 Rev A boards are version 1.
750309 Rev Band C boards are version 2.
Some early version 1 boards did not have a shield
over the oscillator section..
70714000 R327 R345 R363
R381 VR302
VR304 VR306 VR308
Version
1
4.7K 4.7K 4.7K 4.7K 10K 10K 10K 10K
2
10K 10K 10K 10K 20K 20K 20K
20K
2-2