BMW Professional 2000 Radio

Manual to repair

Radio BMW Professional 2000

of Sikkim

Created 4th december 2011

Update 28th april 2012

Translate by Txung on 16 Febuary 2013

After seeing the sense of helplessness that makes us the most when radio failure, having to face a forced substitution of all radio prohibitively expensive for a small very basic features, or change the brand Loss drawbacks Display, keypad and automatic volume control, I decided to solve the problem with this proposal we will save some cash.

Be clear first of all several things:

• This solution only serves to repair the burned amplifier module, any other fault not resolved with this module.

• This repair does not increase the original performance, radio continues with the same features and functionality, so this also means you do not lose control of anything, providing continuous control keypad, display, automatic volume control, etc. ..

• We may have slightly improved cooling: besides having more surface area to radiate the heat this solution is supplemented with a small fan, to prevent the re-‐burn time.

• When any of you want to make this reparation should know that the power module is available by contact mail in [email protected]

ALL information given here is free of any liability.

This is a pilot action has been positive and I communicate to share with you all and you may profit from it if you are interested.

Anyone here follow the detailed explanations personally assume any damage that may occur , therefore it is advisable to have enough knowledge before you make them.

From the forum or mail I will be able to offer help to the extent that I can.

In summary the proposed solution passes by simply replacing the power module, which is usually burnt.

To do this we remove two old burned modules (though only one channel has burned L or R, you remove both )

Here I posted the new power module is designed as to be housed inside the radio, particularly in the space that remains on the left, I decided this side, because the connector on the radio is just this side, and therefore the output wires of the speakers that we have to bridge to the new module has the shortest distance and easier access.

I hope you enjoy doing this reparation, as I have done.

1! Step : we press downwards to remove the cover

You will visualize the CD player, remove the marked 4 screws

Very carefully we’ll remove the CD player lifting upwards and we disconnect the plug.

once we removed the CD out, now we’ll remove an aluminium bar piece lifting upwards

Afterwards, we will remove the upper screws and the lower screws of the faceplate and it’s plug.

Now we got chassis with the PCB board we will remove the 2 screws of the lower layer.

And Remove the clips that hold the chassis

Now we have the PCB free

On the backside we will see the POWER of SMD Amplifier

When i took this photo the Integrated Circuits were already removed, however….

First you’ll see like this, afterwards you’ve to removed the epoxi coverd with the help of a tool very

carefully and it will be seen like this

On the backside of PCB, you’ll see the small radiator, which you need desoldering

After unsoldering the radiator and removing the epoxy plate, now with the help of a drill you have to make a hole eliminating the SMD amplifier burned .

The connections are the following way, is the same for both channels. (L or R)

You can change the “L” for the “R”

-‐BATT -‐BATT

-‐LR -‐LF

+LR

+BATT mute

In LR

+LF

+BAT

Masa señal

In LF

Technical information for the substitution of the amplifier module

The scheme is the following; the model of Integrated Circuit is TDA7375AV, obviously 2 ICs.

The disseny circuit is this:

Serigraphic components side A: PCB side A:

PCB side B:

Measurements are this:

Big PCB 87 x 28 mm

Small PCB 87 x 17 mm

C1 = C6 0.47uF C2= C8 0.47uF C3= C10 47uF C4= C7 100nF C5= C9=C11 10uF R1=R2 10K IC1= IC2 TDA7375AV

C3

After wires soldered module input signal amplification, for it, we will looked for a place on the track to weld with security, I will propose these points and once welded put a little glue on the cord to avoid moves.

Well, now we have all connected, just need to place it inside and close, Pay attention to some details, use duct tape to prevent contact with the chassis module still being spaced a few millimetres, it is better to

isolate with a little duct tape and be calm.

There would also be the possibility of an optional fan; I recommend this place for being the most heated.

IC’s screwed down exploiting some ventilation holes with screws M hex-‐3, placing a grower washers on the inner side of the screw to tighten more comfortably outside, it is important to apply a small amount of silicon on the entire surface temperature IC's contact to foster, not isolate transmission of heat and

therefore quickly evacuate the heat from the chips to the chassis.

Chanel RR

Chanel RF Chanel LF

Chanel LR

Chanel R Chanel L

Once you finished, close everything it should be seen like this:

SIKKIM

[email protected]

Disclaimer: The person who is going to follow these instructions you must have enough knowledge to make the proposed amendment itself assuming any damage that may occur to both the radio as to any part of your motorcycle, expressly waiving any liability to the author of this book,

the author communicates his research who may be of interest for you.

Optional FAN

powered by Vcc

Tape

For protect contacts to the new power module

Screw M3

Documents

BMW Professional 2000 Radio