Sony GY-2120WD Maintenance Manual page 373

4-3) Checking the running system
CTL Head
There are black rings at the upper and lower edges of the capstan tape.
Both sides of the cleaning roller in the longitudinal and helical directions are very dirty.
Guide The edge is dirty.
4-4) Checking the longitudinal signal
4-4-1) Check the playback output of the longitudinal signal using the reference tape.
Use remo.exe to run the tape.
Check the test pin of the EQ-66 board using an oscilloscope.
CTL ANA Normal
CTL PLS Normal
LTC ANA Normal
RSYC Normal
GY-2120WD/WS
6-3. Error Processing
6-149