Marconi Instruments TF 2337A Instruction Manual page 25

SYMPTOM
PRCBABLE CAUSE
Neon lamp
does
not
light
Check
the
fuse
Level meter
and
distortion
meter
does
not
work when
a
signal
is applied.
(All ranges)
Check QlOl toQ106
Level meter
does
not
work
Check QAIOI. QA102
and
Ml
Distortion
meter
does not
work
Check from Q107
to
Q114,
QA103
to
QA108
and
M2
Adjust
R202 (GAIN ADJ)
and
R227
(2fo
ADJ)
but
does
not
become
normal
Check QA201
to
QA205
Adjust
R326
{
12
V
ADJ
)
but
+12
V
and -12
V
do
not
become
normal
Check
Q301
toQSll
Adjust
R105
(BIAS ADJ)
but
bias does
not
become normal
Check QlOl, Q102
and
DlOl
to
D104
Adjust
R119
(LEVEL
GAIN)
but
does
not
become
normal
Check Q103 toQlOS
Adjust R134
(LEVEL ZERO
ADJ)
but
zero does
not
become normal
]
Check QAlOl
and
QA102
Adjust
H159
(DIST.
GAIN)
but
does
bot
become normal
Check from
QUO
and
Q113
Adjust
R176 (RATIO ADJ)
but
does
not
become normal
Check from
QUO
and Q113
Adjust
R176 (RATIO ADJ)
but
does
not
become
normal
Check
QA106
and
QA107
Adjust R184
(DIST.
ZERO
ADJ)
but
does
not
become normal
Check
QA108
and
QU4
Table
5.
1
Fault
location
TF
2337A