Codan 2110 series, Repair Manual

Page: 137 / 164

Repair procedures, tests, and adjustments
Manpack Transceiver 2110 series Repair Guide 105
Figure 34: Transmit fault diagnosis flowchart 1
Does
Rx audio stop
and clicking
start?
Transmit fault
diagnosis
flowchart 1
Yes
No
PTT via handset
PTT using the 0208 with
two-tone set to minimum
Does
Rx audio stop
and clicking
start?
Yes
Audio & Control PCB
or Front Panel PCB
suspected faulty
No
Connect whip antenna to
antenna stud and set Cfg
Auto Tune Mode to ATU
Press TUNE , then
press PTT
Repeat over several
bands
Is
clicking heard
from ATU?
Audio & Control PCB
or Front Panel PCB
suspected faulty
Antenna Tuner PCB
suspected faulty
No
Yes
Disassemble 2110
Set 0208 balance to T1,
output level to –10 dBm,
then key PTT on 0208
Check TP101 on RF/IF &
Synthesiser PCB
Is TP101 level
60 mVp–p?
No
Transmit fault
diagnosis flowchart 2
Yes
Check audio at Tx AF on
RF/IF & Synthesiser PCB
Is
audio at Tx AF
900 mV p–p?
Check audio at TX_Audio
on Audio & Control PCB
Is
audio at TX_Audio
900 mV p–p?
Replace RF/IF &
Synthesiser PCB
Check and/or
replace ribbon cable
between P202 on RF/IF
& Synthesiser PCB and
P103 on Audio &
Control PCB
Check audio at
GP_A/–
on Audio & Control PCB
Is audio at
GP_A/–
200 mV p–p?
Replace Audio &
Control PCB
Lower Front Panel
Assembly from chassis
Check audio at P2 across
pin 2 or 3 on
Front Panel PCB
Is
audio 200 mV p–p
on pin 2 or 3
of P2?
Check and/or
replace ribbon cable
J2 between Audio &
Control PCB and Front
Panel PCB
Check audio at pin 2 or
3 again whilst pressing
PTT on the handset and
whistling into the
microphone
Is
audio visible on
pins 2 or 3?
Replace Front Panel PCB
Check audio at J4 across
pins 30 or 32 on Front
Panel PCB
Are
pins 30 or 32
1.2 V p–p?
Replace Front Panel PCB
Check and/or
replace GPIO audio
connector on Front
Panel Assembly
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
See page 77
See page 107