Fostex G16S - Page 15

4.2.5 Height Adjustment of the Head Assembly Guide
Height of the center guide in the head assembly must be adjusted when tape travel is un 
satisfactory.
The height is adjusted by rotating the screw on the top of the guide with a 3mm box wrench
while running a tape over a guide.
4.2.6 Reel Servo . -71
tension
increase
tension
decrease
Fig. 4.7
4.2.6.1 Tools required for adjustment
Oscilloscope
Tape tension gauge : Tentel Model T2-H20-ML
Blank tape : 1 ” width, Ampex 456 G24S
1/2" width, Ampex 456 G16S
4.2.6.2 Procedure
1) Loosen the screws (a) and (b).
2) Tighten the screws (a) and (b) to hold the bracket (c) horizontally.
3) However, in case the optimum tension value cannot be obtained by adjusting the pots
RI thru R6 in the following tension adjustment procedures, loosen the screw (a) and (b)
and adjust the position of the Tension arm bracket for x direction or x ’ direction for
optimum tension value.
If the Tension arm bracket is adjusted too far x ’ direction, the shut off circuit may be
activated.
4.2.6.3 Tape Tension Adjustment
Tape tension measurement will slightly differ due to scattered calibration figures of the tension
gauge and ambient temperature differences from that at manufacture of the gauge. If the
measurement is only for checking, it will be sufficient if preparations are made as in Item
4.2.6.4 and checked as explained in Item 4.2.6.9.
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