Heathkit AA-1214 User Manual

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~ HEATHKIT ~
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47
Troubleshooting Chart
This Troubleshooting Chart lists
specific difficulties that could
occur in your Amplifier. Several
possible causes may be listed for
each difficulty.
Refer to X-Ray Views of the circuit
boards (Page 61), the Chassis Photograph
(Page 60), and the Schematic (fold-out
from Page 65) to locate and identify
the parts listed on this page.
CONDITION
AREA OF DIFFICULTY
POSSIBLE CAUSE
Amplifier
Power supply circuit.
l. Power fuse blown .
completely
dead.
2. Open power cable or
On-Off switch.
3. Transformer wired
incorrectly.
Amplifier dead,
Power supply circuit.
l. Transistor Qll4.
pilot lamp on.
2.
Diodes 0105, 0106, 0107,
0108, D109 and D110.
3. Zener diode D111.
4.
Capacitors Cl49, Cl51,
or Cl52.
Leads between boards
l. Shield lead and inner
lead interchanged or
shorted.
Speaker switch.
l. Speaker switch in Off
position or wired
incorrectly.
Circuit board.
l. Fuses Fl and F2 blown.
Amplifier
blows
Power supply circuit
l.
Transformer wired
fuses.
incorrectly.
2. Pilot lamp wiring
shorted.
3. Transistor QllOR, QllOL,
Qll lR or Qll l L.
4.
Diodes D105 , D106, D107,
or D108 .
No output in
IC-101
l. IC-101
installed back-
Phono mode.
wards or shorted
(solder bridge).
2. IC-101 not correctly
'
installed (pins not
correct ly seated).
Right channel OK Refer to
Stage-by-Stage
Left channel dead.
tests on Page 48.
Left channel OK.
Refer to
Stage-by-Stage
Right channel dead.
tests on
Page 48.

Heathkit AA-1214 Specifications

General

Brand	Heathkit
Model	AA-1214
Category	Amplifier
Language	English