Sound tape 2 on GF 777

Hi,

On my second 777, the sound from tape 2, Extern and built-in microphone is very low on 2 ways.
I cleaned and controlled all switches, changed SW 101, connected the head 2 of the other GF 777, changed Q105, 106,107,108,129,130,131,132,and C141, C142 ,tape fading Control knob.

The sound of the cassette 1 is good, so all the amplification part and even HP is good.
I controlled everything that is specific to the sound from tape 2 and I can not find the fault.
Anyone has had this problem?
thank you

You mean the volume when you record from mic to tape, or are all this parts low ?
And for what are this numbers ?
Try to check tape 1 on the connection of tape 2 and the record- play- switch...

It's OK.
it was the permanent command of Muting in CNS 703-3 that caused the sound of Tape 2 was so low.