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Maintenance
3-13
The factory alignment procedure compensates for temperature and humidity.
It
is desirable
that the procedure be performed at or as close as possible to normal living conditions.
1. Precondition the alignment disc by exposing it to room temperature for one hour.
2. lnsta!J the alignment disc.
CAUTION
THE ALIGNMENT DISC HAS SPECIAL ALIGNMENT DATA
RECORDED ON IT. EXTREME CAUTION SHOULD BE EXER-
CISED TO PREVENT THIS DISC FROM BEING WRITTEN ON.
3.
Set up the scope as follows:
Channel 1:
Channel 2:
Vertical Mode:
Slope (Sync):
Trigger Source:
Trigger Coupling:
Trigger Mode:
Time Base:
4. Connect the scope as follows:
. 1 Volts/Division ac
.1 Volts/Division ac (inverted)
Add
Negative
External
Low Frequency (High Frequency Reject)
Normal
20 ms/Division
Channel 1
to TP3
Channel 2
to TP4
External Sync to Index at U20 Pin 8
Refer to Figure 3-8 for locations.
eTPI
•TP2
4
Inches
Figure 3-8.
• TP4
•TPJ
•rp15
pin
U20
s-n
·uT
2
Inches
~
Drive Electronics Board Layout Diagram
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