Azimuth Check; Adjusting Head Radial Alignment; Head Azimuth Oscilloscope Settings - NEC FD1165 Maintenance Manual

BACKWARD
FORWARD
ADJUSTING DRIVER
BASE FRAME
Figure 5-3 Adjusting Head Radial Alignment
5.4.2 Azimuth Check
Carriage assembly replacement is usually required to correct
Azimuth error. Set the oscilloscope to the settings in
Table 5-4, then use the following procedure to check· for
Azimuth error.
Table 5-4 Head Azimuth Oscilloscope Settings
ITEM
SETTING
Channel 1 Normal
Channel
2
Inverted
Mode Add
Inputs Ac
Input range 50 mV/division
Test points
TP8 and TP9
Trigger TP7 (dual-sided)
TPlO (single-sided)
Time base 0.5 ms/division
Probes xl
5-6