ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
I am now working with one of the two 9000 I have and this working unit is the version 4814 which I guest
was manufactured in 1982.
In the stage of levels calibration I just couldn`t locate the TP3 and TP4 on PCB2 on the deck.
What a frustration.
Martin_Dillen could help me to solve this.
Two versions of Beocord 9000 exists.Can you please tell me the serial number of your Beocord ?
Martin
My is Beocord 9000 version 4814
serial：2719006 Normal 0 7.8 磅 0 2 false false false MicrosoftInternetExplorer4
serial：2719006
You have the early version, then.There's not always a dedicated point or pad on the board for the testpoints.TP3 and TP4 is found on pin 3 of IC101 and IC201 respectively. That's the Dolby ICs.
Thank you for the information.
What are the Dolby IC that used in this version of Beocord 9000?
No.The testpoints ARE at pin 3.Pin 3 has a small decoupling capacitor to ground, it's not connected directly to ground.The thick bottom line on the schematics (that it also "connects to") illustrates a "wire loom" withseveral connections and the small notes tell you where the individual connections go.From 2IC101 pin3, the connection (which is also TP3) has note j-D1 which means that it goesto point "j" on Diagram 1 (that is pin 1 on 13IC7).
With the 200nWb/m level Test tape,I should adjust 3R160 (3R260)
to580 mvolt.
Martin,
For meter levels calibration,
where to locate the 2TP1 and 2TP2?
2TP1 on 2IC102 pin 9 & 10 (they are connected together)
2TP2 on 2IC202 pin 2 & 3 (they are connected together)