WITE Revision 1.50
Release Notes
Note: If you are upgrading from WITE 1.45 to WITE 1.50, please place your spinstand
in IPL mode before running WITE. Read the "known bugs" section for details.
Introduction
This document contains the release notes for WITE revision 1.50 from Guzik Technical
Enterprises.
All discussion in this document uses WITE version 1.45 as a baseline for comparison.
For information about features and modifications prior to 1.45, please refer to the WITE
user’s manual and to the release notes for previous revisions of WITE.
New features in WITE 1.50
UP7 is now supported. For some preamp chips, the read bias can now be specified in mV rather then in mA. TAA can be calibrated without starting the spinstand. The TDA5354HL head amplifier chip is now supported. Servo write support has been added for the VM61612 head amplifier. It is now possible to shut down power to the preamplifier chip after tests are finished, to provide safer conditions for head replacement. This option is located in the Configure|Preamp menu. An HSA MR impedance test has been added. This test will measure the impedance of each head in the head stack, without starting the spinstand, before starting a production. This is not a gradable test, but is intended as a quick check to ensure that all heads are properly connected and at least minimally functional before beginning production testing. It is enabled by the HSA MR Impedance Test checkbox on the Head S/N tab of the production setup form.
| Minimum Impedance |
Lower bound of acceptable impedance values. |
| Maximum Impedance |
Upper bound of acceptable impedance values. |
| Bias Current |
Read bias value with which impedance should be measured. |
| Flt level in read mode |
Specifies the level of the signal to be detected in the fault line, in accordance with the preamplifier chip specifications. |
| Check fault condition in read mode |
Enables checking the fault line condition of the preamplifier chip. |
Bugs Fixed in WITE 1.50
If the acoustic sensor was activated during a load or unload operation,
the heads could be loaded off the media, destroying them. WITE 1.50 correctly moves
to home position and unloads heads when the acoustic sensor is activated. The SSI1550R head amplifier was not working correctly from WITE version 1.30 to
1.45. This amplifier works correctly in WITE 1.50. Using the TDA5357 head amplifier, the active head was selected after the chip
was placed in active mode. This sequence has been changed to in WITE 1.50 to
conform to Philips recommendations: the chip is in idle mode while the head is
selected and activated afterward.
Known bugs in WITE 1.50
Some bugs were found too late to be fixed for the 1.50 release and will be fixed in a
later release. This section contains all known bugs that you are likely to encounter.
A bug’s presence here means that we are aware of the problem and actively working to
solve it. If you encounter a problem not on this list, please report it to Guzik customer
support.
When upgrading from WITE 1.45 to WITE 1.50 on a system with a Coldfire spinstand, the
spinstand must be in IPL mode to load the new spinstand code. If the spinstand is not in
IPL mode, then you will see the error message "Driver installation error 4005: SPN
2021: (PRGR) Instruction Error." When this occurs, quit WITE, press the red button
to place the spinstand in IPL mode, and re-run WITE. Press the "OK" button when
informed that the spinstand is in IPL mode. This error is contained in the spinstand code
included with WITE 1.45, but manifests itself when upgrading to WITE 1.50.
After changing the product alignment parameters in WDCP (track pitch, number of
tracks, etc.) WITE won’t use the updated parameter values until the current product is
reloaded.
The "retest with next setup" option in the "Production |
Grd/Norm" menu does not register results to the database after the first setup.
It should not be used.
Some DOS applications interfere with communication with Guzik hardware and can result
in unstable test results. Please exit all DOS applications before running WITE.
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