35 MB Primary Hard Drive  (260-4171)    Settings       Faxback Doc. # 5309

DRIVE SELECT / TERMINATION INFORMATION
Quantum Q540

DRIVE SELECT

Five jumpers are provided for logical drive number assignment. DS1, DS2, 
DS3, DS4 cause the drive to be selected when the active drive select line 
matches the installed jumper. Jumper G, when installed, causes the drive to
be selected constantly. The Quantum part number for the jumper plug is 22-
10036.

CONTROL CABLE TERMINATION

If the Modem Q540 is the last drive at the end of the control signal cable, a
220/330 ohm terminator pack must be installed at PCB location RN 3. The
terminator must be removed from RN 3 is the drive is not at the end of a
string of drives. The Quantum part number for the terminator pack is
13-12302.

          │                                                       │
          │                          TERMINATOR                   │
          │                             ┌──┐                      │
          │                             │  │                      │
          │                             │  │                      │
          │                             │  │     DRIVE SELECT     │
          └────┐                        │  │     ooooo            │
               │                        └──┘     ooooo            │
          ┌────┘                                                  │
          │      P3                                               │
          │┌───────┐              J1                      J2      │
          ││o o o o│┌────┐│││││││││││││││││││┌───────┐││││││││││┌─┘
          │└───────┘│    │││││││││││││││││││││       ││││││││││││
          └─────────┘    └┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘       └┴┴┴┴┴┴┴┴┴┴┘

(css 07/30/93)