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 !!
Important !! Data security / disaster recovery of userspecified programming :
If the backup battery / accu is older than 10 years expect program loss, also at a short time main voltage drop .
The ACM board has short battery lifetime . Remember to backup to onboard eeprom .
Expect the lifetime of a lithium battery and a nonvolatile sram circuit to be equal or less than 10 years in ambient battery temperature up to approx 40 degrees centigrade . Look for the production year/week on the battery / nonvolatile sram (w/it's own built in lithiumbattery).
Look for the production year/week written /stamped on the lithium battery .
Processor boards: PMC, PMD, PMF, PMF-R , ACM all have backup NiCad accu battery and PMF-R also have nonvolatile sram circuits ( max . 10 years lifetime) , DPB processor board have lithium battery .
Note! If the charging voltage is missing a ( new ) NiCad accu vill discharge itself in less than a month .
Have a total backup at hand , and make program disaster recovery no big deal .
Send us the proccessor board ( PMC, PMD, PMF, PMF-R , ACM ) and a copy of the PC backup , a copy of the programming journal is also ok . We'll repair / update / reprogram the proccessor board , and then return it with a new, fully charged backup accu battery .
To prevent program loss , the the proccessor board must be inserted in an exchange to have the onboard NiCad battery fully charged inside 2 weeks after the proccessor board was shipped from us.
About proccessor boards and backup of userdata .
PMF, PMF-R and ACM boards have onboard eeprom(s) for backup / restore purposes. It's important to have an up to date backup . On the PMF-R board nonvolatile sram's must have it's own backup, using an (e)eprom programming device is a simple solution .
The CPB-2 board have all userdata on eeprom and no battery. Backup userdata file to PC or use an (e)eprom programming device to make a backup .
The PMC / PMD board has no onboard backup circuits. The programmer must backup all userdata to PC and write a programming journal .
NOTE! Remember to have all programming written in a programming journal .
If possible also have a total chip backup performed on nonvolatile
Note! Remember to make a backup of standard sram first .
Even if the exchange can be programmed using a PC , you must make a backup of all user-data .
Also make a complete backup of onboard eproms , eeproms and / or other running software .
NOTE! Standard sram circuits can not be removed from the board without loosing all its programming.
Contact us about backup of standard sram . Some boards have onboard eeproms for this purpose, some can be connected to a modem using remote backup & programming .
The backup of "eprom" , "eeprom" and "nonvolatile sram" is a fast &
smart operation .
Note! Remember to make a total backup of standard sram first .
Fix Xtal to the PrintedCircuitBoard ( PCB) surface .
program & memory . : PMC / PMD / PMF / PMF-R / DPB / ( AMC ) proccessor boards w / backup batteries .
control: ( PMC / PMD / PMF / PMF-R ) If the LED = steady ON : > proccessor is running , its likely to belive that the board is operating OK .
Backup : An up to date backup of the userspecified programming is most important !
The backup-battery ( 3,6V NiCd ) on the proccessor board has approx.10 years lifetime. If the intercom is dead or the userspecified programming is corrupted, also check this battery . Shown here: a PMC/PMD board , w / additional handshake hardware on the serial port to make programming & backup easy using a computer . Xtal must be fixed to the pcb surface , universal glue is ok
Note! The userspecified programming is the most important ( and expensive ) part of the exchange , do not loose it .
On the proccessor board all userspecified programming must be saved before replacing any IC's , the battery or any part in the battery carge circuit . Don't perform any attempt to repair this board yourself , call / mail us to help you .
After losing or corrupting the userspecified programming . Special programming tools has to be used for reprogramming the exchange and the job has to be performed correctly . If there is no backup available expect days of work at the exchange even for an expert to complete a total reprogramming .
Note! Warning ! Vingtor VMP 52 > 120 - Stentofon MPC 52 > 720
The programselector must stay in the OFF-position , all other positions are dangerous if you don't have a backup of your programming . In the ON-position you can alter the programming , in 52 or 112 position, you can rebuild the programming to the inital programming tables for a 52 numberexchange or 112 - up numbers . All userdata will be lost in this operation , so you better not try it !!
Avoid corrupting the userspecified programming ! Setting the programselector in pos. 52 or 112 is banned !!!
If the exchange is not properly working and the purpose is to repair it , corrupting the userspecified programming most certainly is the wrong way to go ! Example: If you set the programselector of the exchange in pos. 52 or 112, and push ( green ) and red button on the proccessorboard , the result is a total loss of the exchanges userspecified programming , all individually programmed functions will be wiped out , not only the numberseries are altered to a standard table . Perhaps you know how to alter station numbers , but what about groupcalls , call from one-button substations , telephone interface , amplified loudspeaker routing , different alarmsignals , bridge emergency microphone , baudrate setting ? It's not possible to reprogram these functions from a station !! Shit! what a big mistake to do .
Jo Tech Service, Lykkmarka 53, 7081 Sjetnemarka, NORWAY.
email@example.com , www.jotech.no , ( 47 ) 99718408
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