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5.10 CONT
The
control
board
holds
many
of the circuits
used
to
control
the TS-900.
Q1
is the ALC
amplifier, Q3
is an
amplifier for the IP meter reading, and Q4 and O5 are a
TB/RB
switch
to switch
between
transmit
and
receive
voltages.
The TB/RB switch controls the bias supply voltages to the
MIX
and IF boards to disconnect the transmit sections
during receive, and to disconnect the receive sections during
transmit.
VR1
is the carrier level adjustment.
Turn this control to
level
(Control)
BOARD
(X53-1010-10)
(See Figure 28)
adjust
the
plate
current
to
the
proper
operation.
VR2 is the RIT zero adjust control. Turn VR2, if necessary,
53-1010-10
e
ee
for CW
5 ea
2!
so that the RIT zero is at a receive frequency exactly the
same as the TS-900 transmit frequency.
Mixer
ee
RIT/ XTAL
6106-6!
TUNE,
93 p+
WwW
oF
"
rhe Pro.
Y
ati
Qi
Qe
Qs
Qe
Qs
30
clon
alc
D
cr
500\
TP2
RIT Zero
FIGURE
29.
CONT Schematic
—/=
2
CPD
TOROROUL Dnt
y %
FIGURE 28.
CONT Board
_
Bv2
kh
evi
lox 8
pve:
(vr7)
TBH
RTI
RT2
PRIT VR
RTS
Unit (X53-1010-10)
Se See
eee
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