Component Card Assembly; Permissive Make Relays - IBM 1402 Reference Manual

Component Card Assembly
REMOVAL AND REPLACEMENT
1. Remove machine power.
2. Unplug (identify if necessary) the leads in the
solar cell terminal block.
3. Remove the lamp holder mounting screws and
lower component card mounting screw. Remove
component card assembly.
4. To reinstall, replace the lamp holder and mount-
ing screws. Adjust the lamp for proper position.
See
Lamp Assembly, Removal and Replacement,
Step 4.
5. Plug all leads into terminal block.
Permissive Make Relays
The 1402 uses four and six-position high speed and
POTENTIOMETER· FOR LIGHT
INTENSITY IS LOCATED ON
LOWER RIGHT FRONT GATE
ON TRANSISTOR PANEL.
S~INDLE
SETSCREWS
(ADJUSTMENT)
COVER
MOUNTING
SCREWS
PLATE TO STUD
~
MOUNTING SET
SCREWS (3)
MODEL 1
,,>
~~
0
...JO
0 ....
.... z
~>
::J ::J
....
> ....
0
~~
::J co:
0
:s+
N
0
<-'
N
:fl,
I
Figure 3-44. Solar Cell Adjustments
MOUNTING PLATE
SCREWS
(ADJUSTMENT)
standard permissive make (PM) relays. All 1402 PM
relays have 20 volt coils.
CONTACT REPLACEMENT
When a machine malfunction is caused by PM relay
contacts failing to make, it may not be necessary to
replace the entire relay. The following procedure
should be used to replace individual contact wires,
and to check common contacts for dust or corroded
areas.
1. Remove the two relay yoke mounting screws
and separate the contact molding assembly from
the yoke assembly. This will expose the contact
wires and common contacts. Use care to prevent
breakage of coil wires from relay molding. Refer
to Figure 3-46.
2. Using a screwdriver, press the contacts free of
9 TIME SLOT _ _ _ _ -..::::.
DISK
CELL MOUNTING BLOCK
LAMP
J-----::~
TRANSISTORS
COMPONENT CARD
ASSEMBLY
3-37