Tait T830 Series, Service Manual

Page: 153 / 284

Copyright TEL 31/01/96
5.5 Fault Finding Charts
5.5.1 Regulator
Check for
overheating
components &
short circuits.
Check continuity
from D-range
connector pin 9.
N
Y
13.8V present on
IC201 pin 3?
N
Y
5.3V present on
IC201 pin 1?
Replace IC201.
9.0V present
on TP2?
N
Y
Check Q210,
Q209 & IC202d.
20V present
on TP3?
N
Check Q208 is
switching at
approx. 150kHz.
Key Tx.
8.8V present
on Tx reg. TP5?
Regulators
OK.
0V present
on IC202 pin 8?
Replace Q211.
IC202 pin 9
>2.5V?
Check IC202c &
associated circuitry.
Tx timer may
have timed out;
re-key exciter.
8.8V present
on Tx reg. TP5?
Regulators &
timers OK.
IC202 pin 1
at 12V?
0V present
on IC202 pin 2?
Check IC202a &
associated circuitry.
Check IC202b &
associated circuitry.
Check presence
of Tx enable signal.
Y
Y
N
N
Y
N
Y
N
Y
Y
N
N
Y