Service Bulletins

May 19, 2016: DPC-11 Driver Issues

Windows® 7 64 bit operating systems have been known to have issues with the DPC-11 driver installation.  This usually occurs when the user installs the drivers that are included with the DPC-11 software package. Normally Windows® 7 64 bit operating systems will detect and install the proper driver on its own when the DPC-11 is first plugged in. If this does not occur and you install the included drivers there is still the possibility that the DPC-11 will not connect. To correct this issue try the following steps while the DPC-11 is plugged into your computer; 

  1. Make sure you have the latest version of the DPC-11 software. (updated May 19, 2016)
  2. In the Start Menu search window type in Device Manager then click on it to open the device manger window.
  3. Locate “Other Devices” and click on it. You should see “CP2102 USB to UART Bridge Controller” double click on it to open the properties window.
  4. Click on the Driver tab then click on the Update Driver then “Browse my computer for driver software”
  5. Navigate to the directory where you extracted the DPC-11 install files and highlight the “HITECRCD_DPC-11 Driver” directory and click next.
  6. The updated driver should install and appear as “USBXpress Device”
  7. Relaunch the DPC-11 software, the DPC-11 should indicate that it is connected.

 If this does not work try performing a System Restore to a point prior to installing the DPC-11 then reinstall the DPC-11 software following the instruction. DO NOT INSTALL THE DRIVER allow Windows® to automatically install it. 


Product: X2-400 with Firmware Version 1.00.1

Hitec RCD USA is recalling our X2-400 Multicharger due to a firmware error that could result in damage to Lithium-chemistry battery packs. The recall is limited to the X2-400 chargers with firmware version 1.00.1.

How do I know if my charger is affected? 
Scroll through the “Program Select” features by pressing the BATT.TYPE button and then use the DEC. or INC. buttons to scroll through the selections. If you see the screen “Program Select System Set ->” then your charger is affected by the recall. If your charger does NOT have this screen then it is not affected by the recall.

What should I do if I have a recalled charger? 
STOP USING IT IMMEDIATELY and contact Hitec RCD USA at (800) 669-4672 to arrange to have your charger picked up.

Hitec RCD USA apologizes for any inconvenience this has caused to our users.

June 2014: Brushless Servo Service Bulletin

While compatible with most radio control devices, the regenerative braking feature of the HSB-9XXX series servos may cause a problem if the device cannot accept a backflow of current. The types of devices that cannot accept this backflow are: Voltage Regulators, Power Safe Receivers and certain BEC circuits whether stand alone or integrated within an Electronic Speed Control. Check with the manufacturer or the Hitec website for a list of compatible models. If your device cannot accept a current backflow, then you must install a PAD (Power Absorbing Device - Hitec PN# 55756) as described in this manual. A PAD is included with every Hitec brushless servo.

March 2014: HTS iView Notice

Unfortunately due to recent changes by Apple, the HTS-iView is no longer compatible with their devices. We are looking into the options to allow this unit to work again but it is unknown at this time if and when this will happen. If you have an iView it is suggested that you contact us for more information and options.

We apologize for the situation.

Optima Series Receivers - Dual Receiver Warning

Due to the fact that the Optima series of receivers are actually transceivers, they are constantly communicating back and forth with the transmitter. In some dual receiver environments, Hitec has seen that the range of one or both of the receivers can be greatly affected. For this reason, it is strongly suggested that only a single receiver setup be used in any model, regardless of size. Hitec has tested our receivers with all the channels being used with high current draw digital type servos and dual batteries configurations utilizing 2 Y-harnesses. In this scenario the servo bus has been able to handle the current without any issues. If more than 9 servos are needed then it is suggested that a power distribution device be used, such as the kinds offered by Smart Fly or Power Box. For more information click HERE.

Optical Kill Lockout Update

After extensive research and testing it has been determined that the unexplained lockouts, experienced by some users of the Optima receivers, were caused by RF interference generated by ignition modules used in gasoline engines and not the optical kill devices as original believed. As a result of this testing we have now released firmware version 2.01 that effectively eliminates this problem. While the majority of these issues were related to gasoline engines, Hitec strongly recommends that everyone update their Optima 7 and 9 channel receivers to firmware version 2.01 no matter what type of model you fly. Owners of Optima 6 receivers can have their receivers updated free of charge by the Hitec RCD USA service department.For more information on updating your receivers click HERE.

2.4GHz System Optical Kill Warning

2.4GHz AFHSS System locks out whenused with an optical kill switch.
Hitec USA's service department has received reports that some users of our 2.4GHz AFHSS System have experienced system lockouts that have resulted in the loss of control of their aircraft. While there are several factors that can contribute to this, including poor power distribution or improper equipment installation, the increased volume of these reports has prompted an
investigation in order to determine the cause. Our preliminary observations have suggested that the use of Optical Kill devices in conjunction with ignition engines is somehow causing our system to fail.

In light of this discovery it issuggested that users of our 2.4GHz AFHSS system discontinue the use of Optical Kill switches until a determination into the cause of these failures is made and a solution is found.  We sincerely apologize for this situation and to anyone that has been affected by this issue.

HS-20110524 HS-7940/7945/7950TH Jumping/Glitching

In some cases, when using the 7940/45/50's in applications that require a very long extension, they may randomly jump (glitch) when powered by 2S LiPo/Li-Ion batteries. Although this may occur with many systems, it is most commonly found when using JR/Spektrum type RX's, especially the Power Safe versions. We have discovered that due to the resistance in long extension wires, the signal voltage drops, thus causing the issue. We recommend that only high-quality, twisted, 22-guage, high strand count, gold connector extensions be used. In the event that this does not resolve the problem, there are a few options. The use of a signal line booster like that made by Spektrum, and soon to be available by Hitec, resolves the issue in almost all cases. Another option is to solder a .22 tantalum capacitor between +/- on the extension. These solutions are typically only needed when using Li-Po/Li-Ion batteries to lower the voltage below 7 volts and is not needed when using 5-cell NiCd/NiMH or LiFe batteries.

We are aware that these are high voltage servos designed to operate at the maximum voltage allowed for maximum performance. However, to accommodate some radio systems, steps may be required to assure the above issue will not occur. Hitec apologizes for any inconvenience this may cause and is working on a series of new Ultra Heavy Duty extensions (with and without boosters) that will resolve this issue.

RX-20100520 - Optima Receiver Antenna Breaking

Applies to Early Production (before February 2010) Optima 6, 7 and 9 Channel Receivers
It has come to our attention that some customers are breaking the "whisker" off of the BODA antenna used on the Optima series receivers. If this happens the results will be a decrease of operable range. Hitec has taken steps to resolve this issue in future
productions by utilizing a plastic bushing. For existing receivers without this bushing, it is recommended that customers apply a small amount of flexible adhesive such as Shoe Goo around the upper tip of the BODA and the antenna whisker.


HS-20100520 HS-79XX Series Servo - Minimal Load Jitter

Applies to HS-7965/7985/7955/7954/7940/7950 servos
Customers have noticed that these high resolution servos have a tendency to jitter when using 7.4 volt power packs and a minimal load is applied.  This is due to the high resolution circuit adjusting for slight position variances in the gear teeth.  This usually only occurs with minimal loads, for example, when the plane is on the ground in a static position. Once airborne the servo experiences flying loads and the issue resolves itself and should not impact on the flying experience.

TX-20100520 Aurora 9 Transmitter

Using EPA and D/R Functions Create Dead Zone in Stick Travel 
We have confirmed customer reports of a software bug involving the End Point Adjustment and Dual Rate functions.  When both functions are at their highest settings, there is a significant dead zone at the stick endpoints. Until this issue is resolved in a future software update, it is advisable for customers to keep either the D/R or EPA setting at 125% or less or the other at 120% or less.