Tait T800 SL2 25W - Page 196

C5.10 T854 Fault Finding M8SL2-00-002-812
© Copyright Tait Electronics Limited August 2004. All rights reserved.
5.7.2 Regulator
N
Y
Check for
overheating
components &
short circuits.
N
Y
Check Q630,
Q620 & IC640.
N
Y
9.0V present
on TP602?
Check Q660 is
switching at
approx. 150kHz.
N
Y
20V present
on TP603?
Check R615.
Replace IC610.
N
Y
Key Tx.
Y
Regulators OK.
N
8.8V present
on Tx reg. TP305?
Replace Q610.
Y
N
0V present
on Q860 collector?
Check Q860 and
associated circuitry.
Y
0.6V present on
Q860 base?
N
Regulators OK.
Check microcontroller
section.
Check continuity
from pin 9 of
D-range 1.
13.8V present on
IC630 pin 3?
5.3V present on
IC630 pin 1?
Replace IC630.
+5V present on
IC610 pin 1?