IBM 5100 - Page 56

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