Fostex G16 - Page 48

4.3.7 Bia s'Current Adjustment
Put all 16 tracks in the record mode.
Hook the oscilloscope probe hot side to TP-1 , and the ground clip to the GND pin.
Then, set the BIAS LVL pot, C161, at approximately 300mVp-p or lOOmV r.m.s. over the
peak point.
Note: As a non-stopper type Trimmer is used for BIAS LVL adjustment, it might give you a
confusion if it is under the peak BIAS point or over the peak BIAS point. Therefore,
the adjustment position of the Trimmer should be set as shown in the Fig. 4.16 below.
Adjusting area
R/P Amp. PCB
Fig. 4.16
4.3.8 Record Level Calibration
1) Put Dolby NR ON/OFF SW to OFF position.
2) Load the blank tape (Ampex 456) on the transport and apply an audio oscillator output
of IKHz, -lOdBV (0.3V) to the INPUT jack on the recorder connector panel.
Also, plug in a level meter to the OUTPUT jack.
Taking TRACK 1 as an example, the connector number is “ 1 ” for both INPUT and OUT 
PUT jacks. »y
3) Depress the RECORD TRACK 1 button, then, depress the RECORD and PLAY buttons
to put TRACK 1 in the recorji mode.
When thus in the record mode, the meter will indicate the input level regardless of the
position of the INPUT MON button. Check to see that the reading of this meter is OdB,
±ldB.
4) After recording a certain length of IKHz, -lOdBV signal, rewind tape to the starting point,
put the transport in the PLAY mode and check the output level. The INPUT MON switch
45