The procedure totally dismantles the unit, but you only need to dismantle as much as is necessary to access those parts you wish to work on.

This information is provided in good faith, but as I have no idea of your skill levels it is assumed you know what you are doing and that you work on your Select at your own risk.

Be aware that opening the case and/or making changes or attempting repairs to this unit will invalidate any warranty on your Select and may also preclude any future chance of Hornby being able to repair or even update the unit. This also applies to any Select bought second hand, whether working or not, as the previous owner may have opened the case or attempted repairs.

The lower case is attached with qty x 9 triangular recess screws, for which you need a special bit.

There are qty x 4 screws in the underside, qty x 4 in the back panel and qty x 1 up into the top panel from the back panel.

The speed encoder knob pulls off but may need to be prized up with a thin blade to get it started. Position the knob with the marker vertical before removing as the knob has limit stops moulded in which butt against a peg in the case. Note the position of the flat on the encoder spindle for reassembly. This will ensure the knob is replaced correctly later.

Remove the nut and washer from the encoder spindle and rotate the lower case away from the top case.

Release the beige locking bar on the ribbon cable clamp and ease out the ribbon cable.

Release the qty x 2 clips securing the motherboard and the board will lift clear taking care to allow the ribbon cable to feed out of the slot.

The LCD screen is held in place by qty x 4 cross point screws.

It can then be carefully lifted clear. Note the elastomeric (zebra) connectors. If you have had corruption of the screen characters then you can carefully ease the screen away from the daughter board and clean with isopropyl alcohol (IPA), allowing all parts to thoroughly dry before reassembly. The design of zebra connectors means alignment is not critical to satisfactory performance but try to match the original positioning as far as possible.

The top case facia is held in place by qty x 4 cross point screws, but nothing is gained by its removal unless you want to give it a good clean.

The buttons just lift out if required.

Reassembly is the reverse of dismantling except care must be taken to thread the ribbon cable through the motherboard slot before you click the board into place, then fully seat the ribbon cable into the clamp as you press the beige locking bar into place.

Also after securing the encoder with the nut and washer turn the spindle until the flat is positioned as noted earlier and press the knob back into place. The mark on the knob should be vertical. Check for full range of travel left and right up to the marked limits.

At this stage you should power up the Select using either the DC power supply or an Xpressnet cable from an Elite controller and check all the buttons work. Avoid touching any part of the motherboard whilst carrying out this check. If all is well power the Select down and refit the lower case.

Select components:

Major components are shown in the picture below and listed in the table following. At the time of writing no major failures have been reported but the table identifies these items for reference.


Board Code      Description                                  Part Number                   Purpose

C3                   Capacitor                                As marked                    15V to track

C6                   Capacitor                                As marked                    Track output

C10                 Capacitor                                100μF 25V                    5V regulated

F1                   3-Amp 30V Resettable Fuse       As marked                    DC input

F2                   0.9-Amp 60V Resettable Fuse    As marked                     Dc input

L1                   Inductor                                 7μθ                               Track output

L2                   Inductor                                 7μθ                               Track output

L4                   Common Mode Choke               CM1812R 600R-10            Track output

L5                   Common Mode Choke               CM1812R 600R-10            DC input

L6                   Common Mode Choke               CM1812R 600R-10            DC input

L7                   Common Mode Choke               CM1812R 600R-10            Boost output

U1                  PIC 18F4520                                                                 Main functions and display

U6                  12V Regulator                          LM7812CT                       DC input

U7                  5V Regulator                           LM7805CT                        5V regulated

Q1                  Dual mosfet                            IRLU024NPBF                   Track output

Q2                  Dual mosfet                            IRLU024NPBF                   Track output

Q3                  Dual mosfet                            IRF9024N                         Track output

Q4                  Dual mosfet                            IRF9024N                         Track output

Q8                  Dual mosfet                            IRF7509                            Boost output (Xpressnet)

Q9                  Dual mosfet                            IRF7509                            Boost output (Xpressnet)

XX                  Display Screen                         TRI-T CL010-7009-01 Rev C

Known faults:

Although limited in capability of loco and accessory decoder address ranges and not being able to change configuration variable (CV) values other than addressing, acceleration and deceleration the Select is a very reliable unit and there have been no reported faults with it apart from ringing of the DCC signal which can be resolved by loading the track with locos, even if they are not moving.

Speed control knob operation can become rough due to debris under the knob. Easily fixed by removing the knob and cleaning the recess.

Firmware Update:

At startup the Select screen reports three pairs of numbers (1x - 30 - 03):

10, 11, 12, 13, 14 or 15 which is the firmware revision state (v1.0, v1.1, etc to v1.5).

Then 30 which is the motherboard version standard.

Then 03 which is the default loco address, indicating the unit is ready to operate.

The firmware can only be updated by return to works at Hornby. To arrange this to happen contact Hornby Customer Care by phone (see Hornby website for the current number) for a job ticket number. There is a modest charge for this of £15 at time of writing which includes return postage and packing.

The latest version is v1.6 which has improved overload protection and allows you to change allowable values for all CVs 1-255.


Many thanks to Ken Wards in the Hornby Research and Development Department for his help in providing part numbers for the circuit board codes quoted in this article.


Return to Teardown Index

ROB’S RAILS - Teardown Reports     

Hornby R8213 Select DCC Controller

This report details the procedural teardown of a Hornby Select DCC Controller, highlights any parts that are known to have gone faulty, tells of their physical circuit board code, identifies their original part number and where applicable provides an equivalent part by supplier code.

© Rob’s Rails 2019

Robs Rails My Railways Gallery Articles Info and Service Sheets DCC Downloads Teardown Reports Product Reviews Wiring Diagrams Contact Me Coming Next