Hafler DH-500 manual The serial number, if it is not on the unit

The DH-500 Power Amplifier has been carefully en- gineered to provide many years of use without requiring any maintenance or servicing.

Factory assembled units are subjected to many physical and electrical tests before shipment. The amplifier module assemblies of kit units are similarly tested to meet perfor- mance specifications prior to packing. In spite of this, shipping damage does occur, a kit may not be assembled properly, or human error interferes, so service may be needed. The David Hafler Company provides complete service facilities at the factory to make any necessary re- pairs. Because many of the components in this refined de- sign are not readily available through local sources, and the performance of the unit is likely to be compromised with “similar type” substitutions, we strongly recommend factory service, or obtaining the requisite parts from the factory.

It is the owner’s responsibility to return or ship the unit freight prepaid to the factory service department. Units shipped 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.

Use the complete original carton and all packing mate- rial to ship your amplifier. Enclose with the unit the follow- ing information:

1.Complete shipping address (Post Office box numbers are not acceptable, except for correspondence).

2.The serial number, if it is not on the unit.

3.Copy of dated bill of sale if repairs are to be made under warranty.

4.Description of the malfunction. If intermittent, be sure to so indicate.

5.You may also wish to attach your address directly to the unit, or to the line cord.

All service work is guaranteed for 90 days.

Warranties apply to the original purchaser only. The warranty is void if the amplifier has been modified without factory authorization; or if parts have been substituted which, in the factory’s judgment, are not suitable; or if the amplifier has been either physically or electrically abused, or used for some purpose for which it was not designed or intended.

The warranty on the transformer is void if the leads have

been cut too	short for	re-use. If you think the transformer
is defective,	unsolder,	do not cut the leads for its return.

Technical assistance to help you locate the source of a problem may be obtained by calling the Technical Services Department at 609-662-6084, 8am-4:30 pm E.T. It is help- ful to know the serial number of the unit, and the results of any tests you have performed. However, we do not rec- ommend that you attempt your own servicing unless you are knowledgeable in this regard.

The weight of a DH-500 (unless it includes the special multi-voltage power transformer), when packed exactly as it came from the factory, should be just under 50 pounds, and may be shipped by UPS. However, be certain it is fully protected, and insure it for the full value.

If you choose, it is possible to return only a portion of the amplifier for factory service, with some disassembly

on your part. This assumes that you are certain the prob- lem lies only in the returned portion, and that you assume full responsibility for reinstalling it correctly, since a ser- vice warranty cannot be extended for other than the actual portion serviced. Because the transformer is so heavy, and a problem there is most unlikely, its removal by unsolder- ing a few leads is a logical choice. The balance of the amplifier should be insured for at least $700. It is also pos- sible to unsolder the module, and return it, if that is where the only problem lies. However, it requires much more care in packing, to protect the delicate components on the circuit boards, and many more connections must be unsol- dered, so there is more risk for reinstallation error. It should be insured for $400. The service fee for the module is $50. If you return an amplifier for service or checkout, and it is functioning correctly, a charge will be made for the testing time required, as well as for packing and shipping.

WARRANTY FOR KIT-BUILT UNITS

The parts in a DH-500 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-500, return it to the factory along with a copy of the dated bill of sale, and a check for $75. If the cause of the problem is a defective part, the unit will be repaired and returned to you transportatiion prepaid, and your $75 less the shipping charges will be returned to you. If the problem is found to be an error in your assembly of the amplifier, the amplifier will be put in proper working order, tested 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 warrants 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.

WARRANTY FOR FACTORY ASSEMBLED UNITS The DH-500 is warranted for three years from the

purchase date including parts and labor and normal ship- ping costs from the factory to the owner within the conti- nental 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.

20