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machine doesn't know it has a tape drive
Date: Tue, 28 May 1991 11:13 PDT
From: firstname.lastname@example.org (Marian Williams)
We just received a 3675 as a donation from a local company. When we
try to read a tape (for instance during a Restore Distribution) we
get a message that says:
"There is no magnetic tape hardware on HOST"
But there *is*. And it's registered as a service in the host's
namespace object. Anybody have a clue what the message means?
This problem occurs when the tape drive is not responding to the
system's requests. The cause can range from unplugged cables to poor
power supply connections to a dead tape drive.
Further, if you boot the system, and it thinks there is no tape drive,
and then you fix the problem: You must still reset the system to force
it to look for the tape drive again.
Things to check:
1. Open the front door and look up at the rear of the tape drive. There
should be large gray ribbon cable and a four-wire harness plugged
into the rear of the tape drive. Make sure both connections are
2. While you have the front door open, check the machine's cable
connections: The small boards in the card cage have a number of
ribbon cables connected. Make sure all these cables are connected
3. There is a special 24V power supply for the tape drive mechanism that
could be turned off. Open the rear door, check the supply's circuit
breaker and turn it on if necessary. (The supply should be located
just below the card cage on the right side as you look in the rear.)
4. When powering up the system, you should be able to hear and see the
tape drive reset itself. It will move the head (inside the tape
slot) up and down while clicking several times. The tape drive will
also reset any time the FEP is reset (either by console command or by
pushing the front panel RESET button).
If you don't hear the tape drive reseting, it is either not receiving
power or it is broken and in need of replacement.