How to make your Stentofon MPC / Vingtor VMP( stentofon inside ) intercom system work properly.

The AlphaCom/ACM exchanges came approx 1992 to replace the MPC/VMP exchanges , and they are still sold to day.

Note! After december year 2002 the factory production of service boards for the "Stentofon Touchline" series exchanges like "Stentofon Pamex / MPC " and "Vingtor Marine VMP" was history , but there are many of them still working perfectly and it's also possible to have these versatile and high quality exchanges repaired .

Read this page to learn how to make your Stentofon Pamex / MPC and Vingtor Marine VMP ( stentofon inside ) intercom system last several times longer.

Service & Repairing Stentofon / Vingtor Marine intercom / related interfaces and Pa systems is a big part of our work , also by travelling to domestic and international destinations ( language : english / scandivavian ) . We have the knowhow , try us .

Extended system knowledge is neccesary to make a good programming job , also to best program "outdated" VMP / MPC systems .

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In some environments, people using hearing aids are often disturbed by annoying electrical & magnetic noice .

The mobile phones most often use a current loop to send the speaker sound to the hearing device. On many costal ships and some other environments the electromagnetical noice is so annoying that this use of a mobile phone is impossible!

The best way to prevent electrical & magnetic noice is to kill it, at the spot where it is generated. Also use an electromagnetic hearing device to sort out the noice sources.

A well known electromagnetical noice source ! Equipment using a frequency inverter may need an extra Mains noice filter of good quality in front of the inverter. Note! The size of a proffessional filter could be similar to the the size of the frequency inverter itself. Sometimes an output noice filter from the frequency inverter also has to be used.

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Have regular heath control of the exchange:

Make shure all fans are operating, inlet air filters are cleaned / replaced, air outlets are open.

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NOTE! 10 years service interval of user program & backup circuitry. 6Volt 12Ah led accu has to be replaced every 5 years.

Make full backup before you do anything with these boards.

If forgotten you'll have a bad or non working VMP exchange when a backup battery finally is empty and the RAM content is corrupted.

 PMC, PMD, PMF, PMFR , AMC & other prossessorboards like DCB, DPB, VMC , all have one or more onboard batteries for data security.

When you send boards for battery replacement we also need a copy of your programming journal or other backup .

PMC, PMD have no EEPROM program storage and need extra precaution.

Shipping with DHL directly to the ship's agent 1 week before ETA.

The board must be installed in the exchange to be recharged  inside 2 weeks after shipping date,

After 4 weeks the NiCad backup battery is totally discharged and the user programming lost.

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The most important notice!

Like replacing boards in a computer , to avoid serious damage on the exchange electronic boards allways turn off the power before replacing any board in the exchange !!