Fostex G24S Service Manual page 19

5) Put the transport in the F.FWD or RWD mode by depressing the |F.FWD| or ¡REWIND1 button
on the main unit. Each tension at " A " or " B " should be 350 + 10, -20g.
6) Depress the |CLR| (clear) button to release the " ECHANIS -ADJUST " mode.
7) Put the transport in EDIT mode by depressing the EDIT button of the G24S/G16S.
Then, confirm that both T.UP reel and SUPPLY reel are in a steady state at the beginning
of the tape and at the end of the tape. Also confirm if the tape travels are made smoothy
for backward and when rotating the " JOG (EDIT) DIAL "
4.2.6.10 Adjusting the Count Pulse Duty and Fast Winding Speed.
1) First, take off the Rear panel and then swing open the SYSTE CONTROL PCB by taking
two screws out.
2) Rotate the R300 (H) fully CCW from the parts side of the PCB.
3) Put transport in the F. FWD or RWD mode.
4) onitor the testpoint 1 waveform with an oscilloscope.
5) Adjust R302 on the SYSTE CONTROL PCB for a 50% duty of the testpoint 1 wave ­
form (shown in Fig. 4.11)
6) onitor the testpoint 2 waveform with an oscilloscope.
7) Adjust R303 on the SYSTE
CONTROL PCB for a 50% duty of the test point 2 wave ­
form. (shown in Fig. 4.11)
8) Confirm that there is 90° (degree) phase difference between test point 1 waveform and
test point 2 wave form during the F. FWD or RWD mode, (shown in Fig. 4.11)
9) onitor the test point 1 waveform with an oscilloscope.
10) Put transport in F. FWD or RWD mode.