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M2000-00
5.10.1
Radio Won't Switch On
Open front panel/
control head: is
13.8V (T2010, T2015, T203X)
or 13.0V (T2020 & T2040)
present at S2 pin 8?
Check 13.8V at
switch on PT501.
Fault in loom or
remote cable.
Replace IC404.
Replace IC403.
8V transmit faults
Check track to
N
P2 pin 9.
Is 8V present on the
logic PCB at Q503
Check S2 connector
N
emitter (T2010, T2015)
& 8V track.
or Q508 emitter (T2020,
T203X & T2040)?
Is 8V present on the
logic PCB at Q503
collector (T2010, T2015)
or Q508 collector (T2020,
T203X & T2040)?
short to ground.
Is the base voltage on
Check digital
N
Q502 (T2010, T2015) or
signals.
Q507 (T2020, T203X &
T2040) >0.7V?
Is voltage drop
across B/E 0.7?
Copyright TEL
N
Check tracks
on the control PCB.
Y
N
Is IC404 pin 3
shorted to ground?
N
Is IC403 pin 3
shorted to ground?
8V present
P2 pin 9?
Y
Y
Y
Check 8V Tx
S2 pin 10.
N
Check connector P2
to main PCB & tracks
Check for
on main PCB,
Y
Y
Change Q502
N
(T2010, T2015)
or Q507 (T2020,
T203X & T2040).
Radio will not switch on.
Is 13.8V present on
IC402 pin 3 (TDA1020)?
Y
N
Is 13.8V present
at S2 pin 6?
Y
Check 13.8V present
at S2 pin 8 - unit
switched on?
Y
Is 13.8V present at
IC404 pin 1 (5V reg.)?
Y
N
5V at
IC404 pin 3?
Y
N
8V at
IC403 pin 3 ?
Y
Check continuity
of regulators
to control PCB.
32V/21V regulator faults
Check 32V on R433/R434.
N
Check for
short to ground.
N
Check Q402 colector
for 150kHz oscillation.
Y
Change D401.
Y
21V Pin1
IC405?
N
Short to Gnd?
N
Replace
IC405
Fault Finding
5.21
Check power
N
connector &
external fuse.
Check D1 & L1.
N
Check for a
short to ground.
N
Check for
track damage.
Check total resistance
N
of centre tap winding
of L401 is >10.
N
Y
Check circuitry
around Q401 & Q402.
Replace L401.
31/10/96
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