Heathkit TA-16 - Troubleshooting Chart

Page 33
1. Push in on the red button of the secondary
circuit breaker and release it (the secondary
circuit breaker is on the rear of the chas-
sis). If the amplifier comes back on and
remains in operation, the overload was
only of a temporary nature and you need
not look any further.
2. If the amplifier comes back on and then
goes off again, there is a short circuit
somewhere that must be located before
the unit will operate. Look for signs of
overheated parts, bare wires touching each
other or the chassis, or items 1, 3, 4, and
5 of the General Checks. After the trouble
is corrected, press in on the red button of
the secondary circuit breaker and the
amplifier should remain in operation.
3. If the amplifier does not go back on when
the secondary circuit breaker is pressed
in, press the red button on the primary
circuit breaker (the primary circuit break-
er is located on the side of the chassis).
If the amplifier comes back on and goes off
again, there is a short circuit or a wrong
connection at power transformer Ti. After
the short circuit is repaired, this red button
can be pressed again and the amplifier
should remain in operation.
NOTE: In an extreme case where you are
unable to resolve a difficulty, refer to the
Service and Warranty sections of the "Kit
Builders Guide" and to the "Factory Repair
Service" information on Page 40 of this Manual.
Troubleshooting Chart
DIFFICULTY
V
..-
POSSIBLE CAUSE
,
No sound. Pilot
lamp does not
1,
2.
Circuit Breaker tripped. See the Circuit Breakers.
On-Off-On switch incorrectly wired.
light.
3.
Defective or incorrectly installed diode D102, D103, D104, or D105.
4.
Defective line cord.
5.
Defective power transformer.
Circuit breakers
1.
Defective or incorrectly installed diode D102, D103, D104, or D105.
keep tripping.
2.
Shorted capacitor C104 or C35.
3.
Transformer wires improperly connected.
4.
Faulty transistor Q8, Q9, or Q10.
5.
Speaker wires shorted.
No sound. Pilot
1.
Defective or incorrectly installed diode D102, D103, D104, or D105.
lamp lights up.
2.
Faulty resistor R68, R69, or R70.
3. Speakers wired incorrectly.
4. Defective input cable between musical instrument and amplifier.
5. Transistor installed incorrectly.
6.
Faulty component or wiring error in stages Q6, Q7, Q8, Q9, or Q10.
Make point-to-point hum test. See Page 35.
Normal channel dead,
Reverb channel OK.
1.
Defective component or wiring error in stages Q1 or Q3. Make
point-to-point hum test. See Page 35.
Reverb channel dead,
Normal channel OK.
1.
Defective component or wiring error in stages Q2 or Q4. Make
point-to-point hum test. See Page 35.