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Heathkit HD-1250 - Troubleshooting Chart

Heathkit HD-1250
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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
.

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