6300
(5) Disk Exerciser and 6-foot extender cable.
(6) Counter
Ti
mer, Monsanto Model 100B
(:I::
0.1
percent specified accuracy)
or
equivalent.
(7)
Jumper, not
to
exceed 6 inches in length,
with
alligator
clips
on each end.
(8)
Emergency Unload Bypass
Jumper
Plug, PERTEC Part
No.1
03608.
(9)
Voice Coil Polarity Tester, PERTEC Part
No.1
03607.
6.6.1 ADJUSTMENT PHILOSOPHY
Acceptable
limits
are defined in each adjustment procedure, taking
into
consideration the
assumed accuracy
of
the test equipment specified in Paragraph 6.6.
When the measured value
of
any parameter
is
within
the specified acceptable
limits,
NO
ADJUSTMENTS
should be made. Should the measured value fall
outside
the specified
acceptable
limits,
adjustments should be made in accordance with the relevant procedure.
NOTE
Some
adjustments
may
require
corresponding
adjustments in other parameters. Ensure corresponding
adjustments are made
as
specified in the individual
procedures.
The
+
5v,
-5v,
+
10v,
and
-10v
voltages
must be checked prior to attempting any electrical
adjustments.
When adjustments are made, the value set should
be
the exact value specified,
to
the best
of
the operator's abi I ity.
CAUTION
PRIMARY
POWER SHOULD
BE
REMOVED FROM THE
DISK DRIVE WHEN ACCESS IS REQUIRED EXCEPT
IN
CASES OF ELECTRICAL TESTING
AND
ADJUSTMENTS.
Allowable I ine voltage variation is
:I::
1 0 percent
of
nominal. See Figure 4-14 for transformer
primary connections.
Allowable line frequency variations are:
o
50
Hz line
• 48 Hz
minimum
•
52
Hz maximum
o 60 Hz line
•
58
Hz minimum
•
62
Hz maximum
6.6.2
10V
AND5V
REGULATORS
The 10v and
5v
regulator Circuitry is located on the Servo PCBA. The 10v sources are
established by zener diodes and cannot
be
adjusted. The
5v
sources are adjustable by
6-10
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