IBM 1402 Reference Manual page 44

the read feed picker knife cam shaft (Figure 3-43).
This unit replaces RLCB's 4, 5, 6, 7, 8 and 9 on Model
1 machines. The solar cell CB is also used on the
Model 3. The Model 2, however, uses mechanical cir-
cuit breakers.
SERVICE CHECKS
Caution: When a scope or meter is used, be care-
ful not to short between SMS card terminals.
1. Control voltages from external supplies should be
checked on SCTB 5, 6, 9 and 10. See Figure 3-44.
2.
Check impulse duration for
3~r
to
4
0
on cold
machine; 2
0
to 3W after one hour of machine
operation.
TIMING
1. Set cam selector switch on CE aid panel to
position 1. (Brush selector switch off. )
2. While depressing the non-process runout key,
adjust the duration of CB pulse with p6tenti-
ometer on the relay gate transistor panel, for
m~o
to 4
0
(700 to 800 IlS with a scope at SCTBl)
on read dynamic timer dial. Final duration ad-
justment of 2
0
to
3~O
(400 to 700 IlS with a
scope) should be made after one hour of power
on.
Note: If adjustment is obtained, skip to step 8.
3. Visually check that disk is centered laterally in
the slot in solar cell mounting block. Adjust if
necessary by loosening set screws and reposition-
ing spindle on picker knife camshaft. Refer to
Figure 3-44.
4. Set the potentiometer to give 1.8 v across lamp
terminals (SCTB 4 and SCTB 6). This voltage is
used to peak the solar cell output.
5. Remove machine power.
6. Unplug solar cell leads from SCTB 2 and SCTB
8 and connect to an
IDM
meter (yellow lead
plus). Set the scale to a reading capable of
measuring values from 0 to 500 Ila (.5 rna).
7.
Manually trip clutch; bring power up and hand
crank read feed to a digit CB time (disk slot
opposite solar cell). Crank machine slowly to
avoid passing index points where meter deflection
occurs. A minimum of 150 Ila should be observed.
Reposition and/or replace lamp or solar cell
assemblies to obtain required output. See Figure
3-45. Return to Step 2 if lamp has been reposi-
tioned or replaced.
8. With power removed, and reader cranked to 9-
time, a basic timing can be obtained by loosen-
ing disk retaining screw and rotating the disk
until 9-time slot is opposite the light source. Re-
fer to Figure 3-44.
9. To adjust the timing of the cell accurately, loosen
the mounting plate screws (Figure 3-44) and ro-
tate the mounting plate within the mounting
slots. Check make and break time of CB pulses
CARD RESTRAI NI NG
ASSEMBLY
RADIAL CARD
GUIDE ASSEMBLY
CARD RETAINING LEVER
---.......U>
CARD DECK
SUPPORT
STACKER STOP
SWITCH
Figure 3-40. Stacker Schematic
3-34
CARD PUSHER
SLIDE
I
I
I
CARD ALIGNMENT LEVER
ECCENTRIC TO
JOGGLE CARD
TO FRONT OF MACHI NE