Codan 2110 series, Repair Manual

Page: 133 / 164

Repair procedures, tests, and adjustments
Manpack Transceiver 2110 series Repair Guide 101
Figure 32: Receive fault diagnosis flowchart 1
Is
Rx indicator at
full scale?
Receive fault
diagnosis
flowchart 1
Yes
No
Check that frequency and
mode are correct
Set RF signal generator
to –40 dBm then feed
into 50 ohm port
Is a tone
audible from
0208?
Yes
Audio & Control PCB
or Front Panel PCB
suspected faulty
No
Disable mute and scan
Switch on internal speaker
Is a tone
audible from internal
speaker?
Front Panel PCB
suspected faulty
Yes
No
Disassemble 2110
Set RF signal generator
to –30 dBm, Cfg Auto
Tune Mode to 50 ohm
and connect antenna to
50 ohm port
Check RF at TP101 on
RF/IF & Synthesiser PCB
Is
RF at TP101
60 mV p–p?
Check RF at OUTPUT on
RF/IF & Synthesiser PCB
Is
RF at OUTPUT
60 mV p–p?
No
Check RF at centre
pin of J2 on
Antenna Tuner PCB
Is
RF at J2
60 mV p–p?
No
Check RF at centre
pin of J1 on
Antenna Tuner PCB
Is
RF at J1
60 mV p–p?
Yes
Check RF at TX_RX on
PA & Filter PCB
Is
RF at TX_RX
60 mV p–p?
Replace PA & Filter PCB
Check and/or
replace coaxial cable
between PA & Filter
PCB and RF/IF &
Synthesiser PCB
No
Yes
Yes
Check and/or
replace 50 ohm connector
and associated coaxial
cable on front panel
No
Check and/or
replace coaxial cable
between Antenna Tuner
PCB and PA &
Filter PCB
Yes
No
Replace Antenna Tuner
PCB
Receive fault
diagnosis flowchart 2
Yes
Set Cfg Auto Tune Mode
to ATU
Set Cfg Auto Tune Mode
to 50 ohm
Set RF signal generator
to –40 dBm, then feed
into ATU port
Is a tone
audible from
handset?
Yes
No
Is
Rx indicator at
full scale?
50 ohm cable/connection
suspected faulty
Antenna Tuner PCB,
PA & Filter PCB, or
RF/IF & Synthesiser PCB
suspected faulty
Yes
No
Return to Repair
flowchart
See page 77
See page 103
See page 95