Sony GY-2120WD Maintenance Manual page 197

* TG-3 and TG-4 height adjustment/slant guide slantness adjustment
* TG-5 height adjustment
(only when the specification is not satisfied in S-1 mode and S-5 mode)
<Unthreading end mode>
GY-2120WD/WS
TG-4 TG-3
TG-5 (Threading roller)
Tape Running Adjustment at Drum Exit Side
5-3. Tape Running Adjustment
Slant guide
PSW3 x 8
Notch
Adjustment plate
5-11