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R88 & R99 on board D are for the oprerating point from the automatic funktion.
R13 & R14 on board G are for playback equalization.
If you want to adjust the playback equalization you need another testtape with 1khz and 16 or 20kHz with the same level (-20dB)

Ok, if you playback the testtape, you have to adjust the internal level to 675mV (with this 250nWb tape) @9,5cm/sec
The internal level you can measure at the adpapter board

Adapterplatte TS 1000.jpg

or on the input plug for the phones amplifier

Kopfhörerverstärker TS1000.jpg

Or the output ...

Was sind denn das für fiese zusätzliche Schalter in der Frontblende?

Ein Schalter von MM nach MC ist ja auch noch im Spiel

Yes, the Leveltape from Bluthardt, (Bluthardt was not far from my destination), is the right one.
The tape is, due to fulltrack recording, useable for 4 and 2 Track Recorders, and it is for 9,5cm.

The 1kHz Signal from the Testtape is in the neutral zone from the playback equalization.
So, no ...

Die Eingangsbuchsenplatte kann manchmal ganz schön nerven.....
Ich würde erstmal konsequent nach dem üblichen, also kalten Lötstellen und Leiterbahnunterbrüchen, suchen.
Als zweites wären dann die Kontaktübergänge von der Buchsenplatte zur Eingangsverstärkerplatte dran.
....und als drittes würde ich ...

Ebay 376076908796, if you are fast enough.....

Hi,
your mistake was....
You have to calibrate the playback sequence with a test and calibration tape first.

Including...
playback azimuth
playback level***
playback equalizer
VU Meter adjusting
(if you want they show 514nWb @ 0dB) If you want they show 3% hiss (like Grundig wrote), you ...

Few years ago i dived the whole counter in WD40 for several hours and played with the mechanic.
Until the counter works as it should. Maybe this works too?
Maybe i have a counter in Stock? Probably the last.......

The small contact behind the counter switches earth potential to the electronics on the circuit board M.
This happens when the set value and the displayed value of the counter match.
In this case, a transistor generates the stop command.

...hope this is useful