Head Cleaning; Termination Resistor Ic U2F; Shunt Block U1E; Alignment And Adjustments - HP 9130K Service Manual

Maintenance
5-3
Head Cleaning
Periodically the read/write heads on the 9130K may require cleaning. This is especially true
if media failure has been detected. The HP PIN for the head cleaning kit is 92193A.
A mainframe dependent clean program is required to effectively clean the heads and also to
efficiently utilize the entire cleaning disc surface.
Termination Resistor IC U2F (09130-66501 only)
This resistor IC (150
n
per resistor) is inserted into the last drive of a daisy chain. Remem-
ber to insert this resistor IC into the replacement drive when servicing the last drive on a
daisy chain.
Shunt Block UIE (09130-66501 only)
The shunt block must be configured on a replacement drive as it is on the drive being
removed.
Alignment and Adjustments
Introduction
This section provides the adjustment procedures for the 9130K flexible disc drive. The
following recommended adjustments are relatively easy to perform and may be done at the
customers location. The "E" number following the "TP" number is for the 82901-66515
drive boards only.
• Spindle motor
sp~ed
adjustment
• Spindle drive belt adjustment
Spindle Motor Speed Adjustment
The spindle motor speed should be re-adjusted whenever a new spindle motor or servo
electronics board is installed. Refer to Figure 5-1 while making this adjustment.
Required Tools:
• Alignment tool or small insulated shank screwdriver
• HP 5314A or eqUivalent frequency counter (if primary power frequency is unknown or
unstable or when adjusting motor speed under incandescent lighting).
Follow these instructions when primary power is a known 50 or 60 Hz and you are making
this adjustment under flourescent lighting.
1. Check the spindle pulley to see that it has a strobe label. If not, use one from your
service kit.
2. Turn the spindle motor power on and observe the strobe pattern on the spindle
pulley. For 50Hz primary power observe inner pattern. For 60Hz, observe the outer
pattern.
3. Locate and adjust the potentiometer on the servo board untilthe proper pattern on
the strobe label stabilizes.