N
4
TAPE READ
MAP
PAGE
44
OF
45
495
ERROR
004-- SYSTEM ERROR.
Timeout
-If
there
is
a cartridge
in
the tape drive, remove it.
-Remove tape control card
(referto
202).
-Measure the resistance between tape control
card pin
B04
(+channel 0 coil)
and
B05 (+channel
o center tap) (refer
to
227).
Is
the
resistance
between
6
ohms
and
15
ohms?
Y N
496
Defective
read/write
head (refer
to
202).
Check/replace the tape internal cable (refer
to
202).
497
-Measure the resistance between tape control
card pin
B06
(-channel 0 cbil)
and
B05 (+channel
o center tap).
Is
the
resistance
between
6
ohms
and
15
ohms?
Y N
498
Defective
read/write
head (refer
to
202).
Check/replace the tape internal cable (refer
to
202).
499
-Measure the resistance between tape control
card pin
004
(+channel 1 coil) and
005
(+channel 1 center tap).
Is
the
resistance
between
6
ohms
and
15
ohms?
Y N
4
4
G
D
500
Defective
read/write
head (refer
to
202).
Check/replace the tape internal cable (refer
to
202).
L M
-G
4 4 D
4
4
501
MAP
0300-44
-Measure the resistance between tape
control card pin
006
(-channel 1 coil) and
005
(+channel 1 center tap).
Is
the
resistance
between
6
ohms
and
15
ohms?
Y N
502
Defective
read/write
head (refer
to
202).
Check/replace the tape internal cable
(refer
to
202).
503
Rewind the diagnostic tape. It might not
be
positioned correctly.
Defective diagnostic tape cartridge.
Dirty tape head.
Defective
read/write
head (refer
to
202).
Defective tape control card (refer
to
202).
Check/replace the tape internal cable (refer
to
202).
504
ERROR
003-- SYSTEM ERROR.
Machine error.
Defective
F2
(base
I/O)
card.
Defective tape control card (refer
to
202).
Check/ replace the tape drive cable (refer to
202).
505
ERROR
002-- SYSTEM ERROR.
Command error. Incorrect command detected:
Go
to
MAP 0900,
Entry
Point
A.
28SEP76
PN
1608386
EC
829670 PEe 828851
MAP
0300-44
o
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