Eddystone 990R - Page 35

Ref
Emitter
Base Collector
Notes
;
TR
19
7
.
85
V
7
.
5
V
0 .
23
V
TR20
7
.
7
V
7
.
35
V
0
.
55
V
TR21
0 .
55
V
0
.
65
V
7.ov
TR22
0 .
4
V
0 .
5
V 6.8V
TR23
8.1V 8.0
V
4.95V
NOTE
8.
TR24
8.7V
8.75V
4-5V NOTE
8.
TR25
8.1V
8.8V 4.7V
NOTE
8.
TR26
7‘4-V
0-5Y
NOTE
9.
TR27
<7-0
Y
/0-5V
•0
2Y
NOTE
9
.
TR28
005
Y
0'(>5V
007
V NOTE
10.
TR29
O-O^V
j
l^Y
NOTE
10.
TR30
7
.
75
V
7
.
4
V 5.5V
TR31
8.0V
7.75V 5.6v
TR32
9.25V
9.0V
1
4.2V
TR33
9.25V
9
.
IV 1.0V
TR
34
10.7V
10 .
3
V
5.0V
TR35
6.3V 6 .
25
V
12
.
4
V
TR
36
12.6V
12.3
V 6.1V
TR37
.
6.4V
5.9V 12.4V
TR38
5-5V
L
— —
—
—
5.7V
OV
NOTE 1.
NOTE
2.
NOTE
3.
NOTE
4.
NOTE
5.
NOTE 6.
NOTE
7*
NOTE 8.
NOTE
9-
NOTE 10.
SYSTEM
SWITCH
to
"N" (NORMAL)
.
SYSTEM
SWITCH
to
"EXT"
(No drive
applied).
SYSTEM SWITCH
to
"CRYSTAL" (Crystal
fitted
and tuned).
CALIBRATOR
SWITCH
to
"ON".
SELECTIVITY
SWITCH
to
"NARROW".
SELECTIVITY
SWITCH
to
"WIDE".
Accessible
after
removal
of
screening cans. Base
voltage
on both TR18 and
TR18A
can
be
measured
on
underside
of
printed
board
without
need
for
taking
off
the
screens.
MODE
SWITCH to
"CW".
MUTING
SWITCH
to
"ON",
MUTING
GAIN
fully
clockwise
and RF/lF
GAINS
at mini-
mum
settings.
As
(9)
above
but
with MUTING
GAIN
fully anti-clockwise.
Supply
Voltages
.
Voltages
measured
across
the
two
zener
diodes
should lie within the following
limits
s-
Dll
;
s
9.4
- 10.6
volts.
D13 s:
11.4
-
12.6
volts.
-
34
-