Operator Panel Switches, Removal And Replacement - IBM 3274 51C Maintenance Information

d. If the 3274 is a Model 52C and card socket E2 is not
used, modify as shown below:
Board PN
Board EC Wire From To
5643330
788928
Yellow·
E2Ul0 E2S10
5643330 876288 Yellow E2Ul0 E2S10
5643330 876270 Yellow E2Ul0 E2S10
5643330 867281 Yellow Already Wired
e. Add or remove board wire depending on loop feature
card G2 and board PNs as shown below:
Loop Card G2
Board PN Wire Yellow
From To
Installed
6226635
Remove T1Cl1
Tl Bl1
Not installed
4599828 Add
T1Cl1
Tl Bl1
5643329
5643330
f. If the 3274 is a Model 51 C and contains the 2400-,
4800-, or 9600-bps Integrated Modem feature, the
board is wired for either point-to-point or multi-point
(see paragraph 5.4.9.1).
Note: See paragraphs
5.4.9.2
through
5.4.9.4
for
other board wiring that is not l10mzally wired at the
factory.
g. If the 3274 Model 51 C contains the Response Time
Monitor card, perform one of the two wiring
procedures below, the one appropriate for your board
type:
4-16
1. Wiring rework for board with/without Type B
Adapter (A1B4). See Figure 1-3.
Delete
B4BI3 (card side)
B4B13 (pin side)
Add
B2D13 to B5B09
A3D02 to B5D02
B5D04 to B4B13
Check for Deletion
B5D02
A3D02
Wire Length
203.2 mm (8.0 in.)
177.8 mm (7.0 in.)
101.6 mm (4.0 in.)
2. Wiring rework for board with/without 2400-,
4800-, and 9600-bps Integrated Modem (AI C4).
See Figure 1-5.
Delete
C4BI3 (card side)
C4B13 (pin side)
Add
G2D11 to C5B09
M4B12 to C5D02
C5D04 to C4B13
Check for Deletion
C5D02
M4B12
Wire Length
228.6 mm (9.0 in.)
228.6 mm (9.0 in.)
101.6 mm (4.0 in.)
8. To reinstall the board, reverse the board removal steps.
Ensure that the cables, cards, and crossovers are inserted
into their proper socket locations (see Figure A-12, pages
FO-3 and FO-5).
9. If the machine has the Encrypt/Decrypt feature (card
~
No. 21), a new master key must be entered. See
Chapter 6, paragraph 6.4.
4.16 Operator Panel Switches, Removal and
Replacement (Figure 4-15)
4.16.1 On/Off Switch
1. Place the
III /
[Qj
(on/off) switch in the
l2J
position.
2. Remove the power cord plug from the building power
receptacle.
3. Open the gate assembly (paragraph 4.2).
4. Remove the on/off switch as follows:
a. Disconnect the
J
1 connector from the prime power
box.
b. Press the plastic latch
0
at the rear of the switch
and remove the switch.
5. To reinstall, reverse these steps.
4.16.2 Operator Panel Switch (Not Card-l'rlo11nted)
1. Remove the operator panel switch (not card-mounted)
as follows:
a. Disconnect the
J
1 connector from the indicator
card
e.
b. Remove the front panel decal, or cut the decal
around the switch to allow removal.
c. Push the switch from the pin side
e
to release the
switch spring from the panel and remove the switch.
d. Order a new front panel decal if it was damaged
during switch removal.
2. To reinstall the operator panel switch assembly, reverse
these steps.
4.16.3 Encrypt/Decrypt Switch
See Figure D-9 for wiring.