Heathkit TA-16 - Page 44

Page 40
POWER SUPPLY
The AC input from the power line is connected
through the line-reversing On-Off switch and
through the primary circuit breaker to power
transformer Ti. In addition to turning the Guitar
Amplifier on and off, the line-reversing switch
permits connecting either side of the power line
to the chassis through capacitor C103; this is
useful in reducing stray hum ickup from the
musical instrument. The circuit breakers pro-
tects the Guitar Amplifier circuitry under over-
load conditions.
The power transformer has two primary wind-
ings. These two windings may be connected
in parallel for a 120 volt line input, or they may
be connected in series for a 240 volt line input.
The secondary winding of the power transformer
is connected through the secondary circuit
breaker to a full-wave bridge circuit, con-
taining diodes D102, D103, D104, and D105.
Capacitors C104, C35, C36, and C37 with re-
sistors R68, R69, and R70 filter the rectified
voltage from the bridge circuit and establish
the different supply voltages. Zener diode D1,
with resistor R67, regulates the supply voltage
for the tremolo circuit to provide stable tremolo
operation. Capacitor C34 provides additional
filtering for this regulated voltage.
FACTORY REPAIR SERVICE
You can return your completed kit to the Heath
Company Service Department to have it repaired
for a minimum service fee. (Kits that have been
modified will not be accepted for repair.) If you
wish, you can deliver your kit to a nearby Heath
Authorized Service Center. These centers are
listed in your Heathkit catalog.
To be eligible for replacement parts under the
terms of the warranty, equipment returned for
factory repair service, or delivered to a Heath
Authorized Service Center, must be accompanied
by the invoice or the sales slip, or a copy of
either. If you send the original invoice or sales
slip, it will be returned to you.
If it is not convenient to deliver your kit to a
Heath Authorized Service Center, please ship it
to the factory at Benton Harbor, Michigan and
follow the following shipping instructions:
Prepare a letter in duplicate, containing the
following information:
• Your name and return address.
• Date of purchase.
• A brief description of the difficulty.
• The invoice or sales slip, or a copy of
either.
• Your authorization to ship the repaired
unit back to you C.O.D. for the service
and shipping charges, plus the cost of
parts not covered by the warranty.
Attach the envelope containing one copy of
this letter directly to the unit before pack-
aging, so that we do not overlook this impor-
tant information. Send the second copy of the
letter by separate mail to Heath Company,
Attention: Service Department, Benton Harbor,
Michigan.
Check the equipment to see that all parts and
screws are in place. (Do not include wooden
cabinets when shipping receivers, tuners, am-
plifiers, or TV sets, as these are easily
damaged in shipment.) Then, wrap the equip-
ment in heavy paper. Place the equipment in
a strong carton, and put at least THREE
INCHES of resilient packing material (shredded
paper, excelsior, etc.) on all sides, between
the equipment and the carton. Seal the carton
with gummed paper tape, and tie it with a
strong cord. Ship it by prepaid express, United
Parcel Service, or insured parcel post to:
Heath Company
Service Department
Benton Harbor, Michigan 49022