Codan 2110 series Repair Guide

Functional description of PCBs
38 Manpack Transceiver 2110 series Repair Guide
08-06064-001
When ordering a replacement PCB, use the information in the listed spares drawing to
select the correct assembly (see page 25, Interconnection diagrams and listed spares
drawings).
CAUTION
If this PCB is replaced, ensure that IC1 has the same (or later) firmware
version as the original.
If the output FETs are replaced, some adjustments must be made (see
page 79, Adjusting the PA). Complete all the adjustments within this
section.
NOTE
All input signals for measuring Tx voltages are –10 dBv two-tone signals
from the 0208 test set (or equivalent), unless stated otherwise. This signal
level provides maximum ALC and therefore maximum output power for
taking the measurement.
NOTE
All input signals for measuring Rx voltages are –10 dBm from the RF
signal generator at ±1 kHz from SCF.
WARNING
Ensure that the earth lead from the CRO probe is short when measuring at
the TX_RX test point.
Table 9: Test points for the PA & Filter PCB (08-06064-001)
Test point Correct signal Explanation Source
+10V +10 V DC Regulated supply V2
+12VSW +12 V DC A rail, PTT active V8
+3V3 +3.3 V DC Regulated supply IC10
+5V5 +5.5 V DC Regulated supply V38
+5VSW +5.5 V DC Rail, PTT active V39
A +12 V DC Switched, unregulated battery
supply
Battery or power via
Fuse F3–F4
ADC ALC (P control) IC1
ALC Approx. +3 V DC Tx ALC (output to PA stage) IC7
DR +12 V DC Driver collector voltage V29 to V32
EXT ALC ALC from external device
(only if X1 linked)
Direct from GPIO
port (2110 only)
FWD PWR 18 V p Tx ALC (forward power) D1
INT – Data (interrupt for PIC) IC104 master PIC,
Audio & Control PCB
OP ALC Approx. +4.3 V DC Tx IC7
OUTPUT 110 V p–p Tx Input/output for Antenna
Tuner PCB
Filter stage

Codan 2110 series Specifications

General

Brand	Codan
Model	2110 series
Category	Transceiver
Language	English