IBM 5110 Series Maintenance Analysis Procedures page 64

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533
TAPE READ MAP
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468
- Disconnect the tape drive cable 22 from
the board (see MIM 231).
Is the UP light on 7
Y N
469
Bad H2 (base I/O) card.
470
Check/ replace the tape unit cable (see
MAP 0210 and MIM 230,231).
471
- Test for continuity from tape control card pin
B07 (- cartridge in place) to pin B08 (gnd).
Is there continuity between the pins 7
Y N
472
Bad tape control card (see MIM 203).
473
Bad tape switch assembly (see MIM 203).
Check/ replace the tape internal cable (see
MAP 0210 and MIM 203).
474
ERROR 909--WRAP ERROR.
Error occurred during a test of the H2 (base I/O)
card, no wrap of data.
Bad H2 (base I/O) card.
A
F
5
MAP 0300-40
475
ERROR 907--INTERRUPT ERROR.
Incorrect interrupt response.
-Probe H2-G08 (-read clock).
(See appendix B, the general logic probe, in the
5110 MIM).
Are both lights on and steady7
Y N
476
Is the DOWN light on 7
Y N
477
-Probe H2-D13 (-int req 2).
Is the DOWN light on 7
Y N
444
111
G G G
K L M
478
-Remove the A2, B2, and D2 if installed.
-Press RESTART. Wait 25 seconds.
-Retry loading the TAPE READ TESTS
(see M I M section 4, Diagnostic Aids)
Did you get an ERROR 9077
Y N
479
One of the cards you removed is bad.
Install each card one at a time,
pressing RESTART and retrying the
TAPE READ TEST after each card is
installed. The card which causes a
907 error is bad.
480
Bad H2 (base I/O) card.
Bad J2 (processor) card (see MAP 050
for jumpering).
Bad tape control card (see MIM 203).
Check/ replace the tape unit cable (see
MAP 0210 and MIM 230,231).
01JAN79
EC 836600 PEC 835541
MAP 0300-40
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