(
Service
Hints
• Try
to
force the failure when running diagnostics by:
Vibrating the
machine/
cards/
connections.
Raising the machine temperature (unplug the
blower).
CAUTION
00
not exceed
20
minutes.
Lowering the machine temperature (use a circuit
coolant).
• Machine power must
be
off
when removing the
read/write
storage cards (K2 through N2). All other
cards can be removed
with
power on.
• You
can
remove the following cards/devices
if
they
are not part
of
the failing operation or when trying
to
isolate
to
a failing operation:
A2 -
I/O
Driver
B2
- Communications and serial
I/O
APL cards C2,
02, 04,
H4
if
the failure is in
BASIC
BASIC card C4
if
the failure is in APL
Read/write storage cards above 16K
5103 Printer
1506 Auxiliary Tape Unit
• You
can
swap either the parts
of
the tape units
(internal and auxiliary) or the complete tape units
(physically or electrically). To swap electrically, swap
the cable in the Z2 socket
of
the 5100
A1
board
(228) with the cable in socket B4
of
the Auxiliary
Tape Unit (580). The internal tape unit address is
now
E40
and the Auxiliary Tape Unit address is E80.
• To loop CMO
0:
Load and run CMO 0 until the first stop
Insert diagnostic cartridge
Hold CMO and press ATTN
Press A
Enter: 368C2B04
Press SPACE bar
Press A
Enter: 2B5831
BO
Press
SPACE bar
Enter: BR2B04
Press
EXECUTE
Tape
Status
Byte
Bit
Description
-
Storage
Address
OOSF
Bit
O-End
of
Tape
(EaT): Indicates that
anyone
of
six
holes in the tape (three at the beginning and three at the
end) generated
EOT
status.
Bit
1-
No
Device Address E
Response:
Indicates that
status bit 1 was not active.
Bit
2-
Tape
Running: Indicates that the forward or
reverse select magnets were selected.
Bit
3-Cartridge
in
Place:
Indicates
that
the cartridge
in
place switch is active.
Bit
4-Erase
On:
Indicates that either channel 1
or
channel 0 erase current was on.
Bit
5-LED
and
Erase
OK:
Indicates that the
EOT
and
BOT
LEOs
were conducting and that the erase coils did
not have
an
open circuit.
Bit
6-File
Protected: Indicates that the file protect
switch was made.
Bit
7-No
Beginning
of
Tape
(1 =
No
BOT): Indicates
that
none
of
the
top
five holes
in
the tape generated
BOT status.
Intermittent
Failures Troubleshooting Guide 3-77
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