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was installed correctly. Make sure U3 is installed correctly. Check D1 for polarity. Check the SIP
resistor (RP1) for proper orientation.
No Display: Make sure the 14-pin ribbon cable is installed and oriented properly. Be sure the nylon
washers are in place on the two nuts closest to the outside. Turn R25 (LCD Contrast) fully counter-
clockwise for initial settings. Then adjust for best viewing.
Can't get 0.0 volts on REV with HF remote sensor: Make sure T1 was wound correctly in the HF
remote sensor. Make sure the #18 gauge wire from the PC board passes through the center of T1.
Check polarity of D1 and D2 on the HF board.
Alarm does not work. Check Q1 and D5 for orientation. Check menu for proper swr setting. Be sure
to note that the relay alarm is different than the LED alarm.
Tech Support:
Telephone technical support at 410-586-2177 is available most weekdays from 8 am
to 9pm Eastern Standard Time. Replies by FAX (410-586-8475) are welcome; e-mail
(ldg@ldgelectronics.com) is also answered on a daily basis.
Last Resort: As a last resort only, LDG Electronics will attempt to repair any problems. We have a
flat fee of $40 plus parts to repair a DWM-4 (most resistors and capacitors are included in that fee).
The 68HC11 chip is the most expensive at $25.
We will not attempt to repair any unit that has been soldered with acid core. We reserve the right to
refuse repair due to excessive problems or damage due to construction.
Before any unit is sent to us, you must first call (or e-mail) to get return authorization. All units sent
back must be prepaid, either by check, money order or Credit Card unless other arrangements are
made. Package the unit carefully and keep in mind that we will use your packaging to return the unit
back to you. Include a description of what problem you are having along with your name, address
and a phone number that you can be reached at in case we have questions. Repairs average about
3 to 6 weeks, depending on the particular problem.
If you have an idea of how the unit can be made better (in software or hardware), please send a
description of your upgrade. If we use it for the DWM-4, we'll send you a free upgrade. Future
upgrades will be available for about $15 with 68HC11 chip trade in. If you purchased the kit from
LDG, we will notify you when future upgrades and modifications are available through the LDG
Newsletter. If you purchased the unit through a distributor and would like to be added to our mailing
list, just drop us a note by mail, fax or e-mail.
Feedback: We encourage everyone who builds the DWM-4 kit to drop us a note (card, letter or e-
mail preferred) to let us know how well it works for you. We're also always on the lookout for
photographs of the DWM-4 in use. We frequently place pictures that we receive into the DWM-4
Newsletter or on our Web site (www.ldgelectronics.com).
