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2.2
RADIO MODIFICATIONS
2.2.1
The TRITON 20 and TRITON 12 and 24 chan-
nel radios require circuitry modification
if
(hey
were built before July 1, 1980. Those radios built after
this date do not require the following modifications. All
the components required for these modifications are in
a small package of parts supplied with the antenna
tuner. Since components for both radios are included,
some components are not used, depending upon which
radio is modified.
2.2.2
TRITON 20 Modifications
(Refer to Table 1, and Figures 2 and 3.)
The TRITON 20 modification consists of the ad-
dition of 2 components to a circuit board.
Step 1. In the TRITON 20 instruction manual, locate
the TRN4032A
"A"
circuit
board
overlay
and
schematic diagram.
Step 2.
Select the components listed in Table 1, and
install the diode and resistor as illustrated in Figure 2.
Table 1. TRITON 20 M odijication Parts List
CA110
CA12
CA19
A198
a16
""'-30007-0
IC><OI
Figure2.
TRITON 20 CircuitBoard Modifications
2
""8
100
CR110
J3-1O
PA DISABLE
9T
CR12
8.0V
CR21
TD ROt
Figure3.
TRITON 20 Schematic DiagramModijications
TRITON 12 and 24 Channel Radio
Modifications
(Refer to Table 2 and to Figures 4 thru 7.)
The TRITON 12 and 24 channel radio modifica-
tions consist of changes made on two separate circuit
boards. The first modification is done to the main cir-
cuit board by addition of components listed in Table 2.
Figures 4 anCb.S illustrate where these components are in-
stalled.
The- second
modification
is done to the
transmit/receive switch circuit board by the addition of
components listed in Table 2. Figures 6 and 7 illustrate
where these components are installed.
2.2.3
CAUTION
Early versions of 12 and 24 channel
TRITON radios must have resistor R44
on TLN17S2A Power Amplifier changed
to a 3.3k ohm,
SOJo,
1/4 watt resistor for
proper antenna tuner operation.
Step 1.
In the TRITON 12 and 24 channel radio in-
struction manuals, locate the TUAlllOA or TUA1120A
Universal Radio Chassis and Main Board "M" overlay
and schematic diagram.
Step 2.
Select the components (CRSI9 thru CR523
and RSI8) listed in Table 2, and install the diodes and
resistor as illustrated in Figure 4. Use sleeving on the
component leads.
Table 2. TRITON 12 and 24 Channel Radio
Modijication Parts List
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