Service manual

96022 Revision L 5-1
StorageTek Protected
5
Library HVD to LVD Conversion
The LLC card supports both high voltage differential (HVD) and low voltage differential
(LVD) operation. For some applications, such as when using a Fibre Channel router, you
must have the applicable jumper and cable on the LLC card in the LVD position.
To determine your current setting:
1. Remove all the screws attaching the electronics module to the frame.
2. Use the handle to pull the electronics module out until you can access the LLC card.
3. See Figure 5-1 on page 5-2 and Figure 5-2 on page 5-3 and compare the settings on
the card.
Note: You can also use the operator panel Lib Info/Config menu to check your SCSI
configuration. The display will show LVD or HVD, determined by the jumper
position. However, it is possible that the SCSI cable could be connected in the
HVD position, and the Fibre Channel router would not function.
CAUTION:
Equipment damage: The jumper must be in the LVD position or the Fibre
Channel router will be destroyed.
To convert an HVD library interface to an LVD interface, you must:
• Move the position of the jumper block located at J16 on the LLC card
• Move the SCSI Y cable from J18D to J18LS on the LLC card
• Use an LVD terminator, part 10097653, where required
To convert the library’s SCSI interface to LVD:
CAUTION:
Possible equipment damage: To prevent possible damage to the LLC
card, it is strongly suggested that you remove the card from the machine
to perform this procedure. See “LLC Card” on page 4-30.
1. Move the jumper at J16 from the HVD (left two columns) to the LVD position (right
two columns).
2. Move the SCSI Y cable from J18D to the J18LS location.
3. If a terminator is required, attach an LVD terminator, part 10097653.
4. Install the LLC card if you removed it.