Troubleshooting Chart - Heathkit HD-1250 Manual

Page
60
Troubleshooting Chart
The
following chart
lists
the "Condition"
and
the "Possible
Cause"
of
a
number To
locate parts, refer to
the "Circuit Board X-Ray Views" on Page
64, the
of malfunctions.
If
a particular part
is
mentioned {Q11, R13, C21,
etc.) as a
"Voltage Charts"
on
Page
65, or the
"Schematic Diagram"
(fold-out
from
Page
possible cause, check
that part to see
if it
is
incorrectly wired or
installed 67).
improperly. Also check
to see
if
an improper
part
was
installed at that
location.
It
is
also possible,
on
rare
occasions, for a part
to
be
faulty.
CONDITION
POSSIBLE CAUSE
1
.
No
meter
indication {red
m
1.
Weak
battery
(less
than 7
volts).
coil installed, oscillator
level
maximum).
Z.
Coil
not
fully seated.
3.
ODen
coil tauhstitutp
with nrannp mill wll
Willi
UIOIIUC
UUII/i
4. Miswired or
open headphone
jack.
5.
Level control wires reversed.
6.
Shorting wire not
remove from
transistor
Q21
7.
Transistors Q11, 021.
8.
Diodes D21, D22.
9.
Meter
shorting
wire not removed.
10.
Braid shorting to capacitor C21