Dsu Controls And Indicators - HP 9130K Service Manual

5-14 Maintenance
DSU to the 9130K. The Disc Service Unit and adapter cable both require a +5V supply.
The 9130K also requires a +5V and + 12V supply. Therefore a dual power supply (+5V
and + 12V) should be used. This information is for reference only. Most mainframes can
function in place of DSU.
The front panel of the DSU with the overlay installed, is shown in Figure 5-13 .
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Figure 5-13: DSU Controls and Indicators
The DSU LED descriptions are as follows:
INDEX LED Lights each time index hole in disc passes the disc drive
index sensor.
RD/WR DATA
DRIVE READY
TRKO
WRITE PROTECT
Lights when DSU is writing on or reading from a disc.
Lights when the disc drive is ready to be exercised.
Indicates when the read/write head is at track O.
Indicates when the disc is write protected.
The DSU switch functions are follows:
KEYPAD
STOP
Used to establish parameter values for min and max track
and step rate. Each time a key is pressed, that number is
entered into least significant digit of 3-digit decimal display
and other numbers shift up. The programmed number is
entered when appropriate parameter pushbutton is press-
ed.
Stops DSU continuous operations (alternate seek, con-
tinuous write) and error signals. Pushbutton indicator
lights when DSU is waiting for a command.