Hafler DH-200 Assembly And Operating Instructions Manual - page 11
vanced design of this circuit means that some components
will not likely be available locally, and alternative replace
ments are not recommended at all.
We recommend that a defective output module be sepa
rated from the amplifier, and returned for service at the fac
tory. This reduces shipping weight and the likelihood of
damage, and enables you to operate the other half if you
wish. In this case, we suggest that the connecting wires be un
soldered at the eyelets; that each wire be tagged with the
eyelet number (visible inside the board, along the edge — or
see the board diagram in this manual); that the bare wire
ends all be insulated; the dual power supply fuses for that
channel be removed; and the wires to that thermal breaker
on the heat sink fin be disconnected and temporarily
soldered together,
and insulated.
SERVICE POLICY AND LIMITED WARRANTY
The DH-200 Power Amplifier has been carefully
engineered to provide many years of use without requiring
any maintenance or servicing.
Factory assembled units are subjected to several physical
and electrical tests before shipment. The output circuit board
assemblies of kit units are similarly tested prior to shipment.
In spite of all this testing, shipping damage does occur, kits
are not assembled properly or someone "goofs" and service
and/or maintenance will be required. The David Hafler Co.
provides complete service facilities at the factory to make
any necessary repairs.
It is the owner's responsibility to return or ship the unit
freight prepaid to the factory service department. Units ship
ped freight collect will not be accepted. For units to be
repaired under warranty a copy of the dated bill of sale must
accompany the unit.
Shipment should be made via UNITED P A R C E L SER
VICE. Parcel Post is not a safe way to ship electronic equip
ment. The factory will not be responsible for damage caused
by parcel post shipment and repairs will be made at the
owner's expense. When shipping your DH-200 be sure to in
sure it for the full value of an assembled amplifier.
Use the original carton and packing material to ship your
amplifier. Enclose with the unit the following information:
1. Complete shipping address (Post Office Box numbers
are often not acceptable).
2. The serial number.
3. Copy of dated bill of sale if repairs are to be made under
warranty.
4. Description of the malfunction. If intermittent, please
note.
5. We also suggest further identifying the unit as yours by
putting a label on the bottom or tieing a label with your
name and address on the line cord.
All service work is guaranteed for 90 days.
Warranties apply to the original purchaser only. Warran
ties are void if:
1. The amplifier has been either physically or electrically
abused or used for some purpose for which it was not
designed.
2. The amplifier has been modified without factory
authorization.
The transformer warranty is void if the leads have been
cut too short for reuse. If you think a transformer is defective
the leads must be unsoldered, not cut, for its return.
Technical assistance to help you locate the source of a
problem may be obtained by writing the Technical Services
Department. It is helpful to know the serial number of the
unit and the results of any tests you have performed.
SERVICING A N AMPLIFIER M O D U L E
If you are certain that the problem is confined to one of
the amplifier modules (comprising the circuit board, heat
sink, and output transistors), you may remove and return
only the module for service. Be sure that the components on
the circuit board are well protected — as by a surrounding
sleeve of corrugated cardboard which rests against the heat
sink, and projects beyond the components. Properly packed
and insured for $150, this assembly can be sent by parcel
post, as well as UPS, if necessary. A service fee of $20 must
be sent with every module, since the fault may have been
caused by a wiring error elsewhere. For this reason, too, and
because we have no control over its proper reinstallation, the
service warranty on a separate module is limited to assurance
of its proper functioning when it leaves the service facility.
All modules are tested before return to you. If you believe
the fault is the factory's warranty responsibility, include the
serial number and the bill of sale. If in our judgement the
fault is entirely a manufacturing defect, a portion of the ser
vice fee will be refunded. Only a complete amplifier can be
completely checked and given a service warranty.
W A R R A N T Y FOR KIT-BUILT UNITS
The parts in a DH-200 kit are warranted for a full year
from the purchase date. If a defective component is found on
a circuit board or in a kit, simply return the individual part to
the factory prepaid together with the serial number and the
date of purchase, and it will be replaced at no charge.
If you cannot locate what is wrong with your DH-200,
return it to the factory with a copy of the dated bill of sale,
and a check for $40. If the sole cause of the problem is a de
fective part, the unit will be repaired and returned to you
transportation prepaid, and your $40 less a charge for re
packaging and shipping will be returned to you. If the prob
lem is found to be an error in your assembly of the ampli
fier, the amplifier will be put in proper working order, test
ed to be sure it is meeting specifications, and returned to
you (freight prepaid within the continental U.S.). Excess
shipping charges for expedited service, or overseas delivery
are your responsibility. At the sole discretion of the factory
service department, if the time required for diagnosis,
repair and testing, and the nature of the malfunction war
rants it, a portion of the submitted repair fee may be
rebated.
This warranty is void if the kit has not been completely
assembled or if other than rosin core solder has been used.
Units assembled with acid core solder or paste flux will be
returned unserviced.
W A R R A N T Y FOR F A C T O R Y ASSEMBLED UNITS
The DH-200 is warranted for a full year from the
purchase date including parts and labor and normal shipping
costs from the factory to the owner within the continental
U.S. The owner is responsible for returning the unit to the
factory and must submit a copy of the dated bill of sale.
This warranty gives you specific legal rights. You may
also have other rights which vary from state to state.