IBM 5110 Series Maintenance Analysis Procedures page 92

K
6
DISKETTE READ MAP
PAGE 22 OF 27
243
-Perform the'LED and PTX service checks (see
5114 MIM 162.)
Is the LED service check OK?
Y N
244
-Measure +5 Vdc at TPB-15 on the diskette
drive control card (ground on the ground
strap).
Is the voltage OK?
Y N
245
-Check fuse 1 (see 5114 MIM 183 and
LOGIC 440).
Is fuse 10K?
Y N
222
443
246
- Replace fuse 1.
Does the fuse blow again?
Y N
247
Bad fuse.
248
- Disconnect the cable from A 1 D4 to the
drive.
- Replace the fuse.
Does the fuse blow again?
Y N
249
Check/replace the D4 cable in 5114
(see MAP 0210).
Bad drive control card.
Bad LED or PTX assemblys.
C C C C
L M NP
c
P
250
MAP 0310-22
- Disconnect the cable from A 1 B4 to the drive.
Does the fuse blow again?
Y N
251
Check/replace the B4 cable in 5114 (see MAP
0210).
Bad drive control card.
Bad LED or PTX assemblys.
252
Is there a 5103 attached?
Y N
253
Bad 5114 C1 (adapter) card (see MAP 050
before replacing this card).
Bad cable from A 1 A4 to the DC power supply.
Bad DC power supply (see LOGIC 440).
254
(Entry Point K)
-Disconnect the 5103 from the 5114.
-Insert a new fuse.
Does the fuse blow again?
Y N
255
Suspect a short or open in the DC voltage
distribution in the 5103 (see LOGIC 430).
Check the I/O cables.
256
Bad 5114 C1 (adapter) card (see MAP 050 before
replacing this card).
Bad AlB 1 (VFO) card, if installed (see MAP 050
before replacing this card).
Bad cable from A 1 A4 to the power supply.
Bad DC power supply (see LOGIC 440).
Bad cable from A 1 A2 to the I/O port.
01JAN79
EC 836600 PEC 835541
MAP 0310-22
~"