Fuses; Addressing; Bus Address Selector Switch - HP 9895A Service Manual

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General Information
Fuses
A different fuse is required for each of the two voltage ranges of 100-120 and 220-240 Vac.
Table 1-3 gives the correct fuse ratings and part numbers.
Voltage Range
Addressing
100 - 120
220 - 240
Table 1-3. Fuses
Fuse Rating
3 Amp Normal Blow
2.0 Amp Normal Blow
HP Part Number
2110-0003
2110-0002
The address of each individual drive is composed of two parts, the bus address and the drive
or unit number. Each of these parts is set on a different switch in a different location, using a
different set of rules. Since it is essential that this address be set correctly, these will be
covered in detail.
Bus Address
The various devices on an HP-IB channel are differentiated by the bus address portion of
the address. The 9895A must use a bus address between 0 and 7. The bus address select
switch is located on the front of the controller board {see Figure 1-2). Removing the front
cover provides access to the switch. Note that although as many as four drives may be
controlled by one controller board, they all have the same bus address. If several controller
boards are connected to an HP-IB, each must have a different bus address. If you change
the bus address, change the number on the front panel, also.
figure 1-2. Bus Address Selector Switch
Bus Address
Select Switch