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Page of SY31-0244-2
Revised December l, 1971
By
TNL: SN31-0307
5.3 POWER SEQUENCING
The +24V control voltage controls power sequencing. The
power supplies sequence up:
1.
-4V basic logic voltage. (If installed, the -4V add-on
regulator and the -4V logic supplies #2 [Feature] and
#3 [Feature] also come on at the same time.)
2.
+6V logic voltage
3.
-30V storage supply voltage
4.
+24V (5424) and +60V (5203) supplies
Refer to diagrams 6-005 and 6-010 (for early design power
control); diagrams 6-015 and 6-020 (for the redesigned
power control) in IBM 5410
Processing
Unit
Diagrams,
SY31-0202, for power-on sequencing.
5.4 ADJUSTMENT OF THE -4 VOLT POWER SUPPL V
Caution
Check the overcurrent adjustment whenever replacing a
-4V regulator card.
5.4.1 Overcurrent Adjustment
5.4. 1. 1 For Regulator Card Part 5808959 (See Figure
5-4 for Identification)
1.
Connect the meter across the 4V load between brass
plate # 2 (-4V) and brass plate #I (ground) behind
the CPU console.
2.
Set the voltage adjustment potentiometer (Figure
5-4) to -4.6V. Do not go beyond this. Turn the over-
current potentiometer counter clockwise until the
machine powers down. (If you cannot reach -4.6V
before the regulator trips, turn the overcurrent ad-
justment clockwise until you can just reach -4.6V
before the regulator trips.)
5-4
3.
4.
5.
When the overcurrent adjustment trips, the machine
will power down.
Turn the voltage adjustment potentiometer down
until the machine can be powered up. The over-
current adjustment is now correct.
Adjust the voltage adjustment potentiometer (5.4.2).
5.4.1.2 For Regulator Card Part 5860519 (See Figure
5-4 for Identification)
No adjustment for overcurrent protection is necessary.
5.4.2 Voltage Adjustment
1.
Connect meter between brass plate #2 (-4V) and
brass plate# I (ground) behind the CPU console.
2.
Set voltage for -4.l SV.
3.
I
4.
5.
Connect meter across A-A3C2B06 (-4V) and
A-A3C2D08 (ground). This voltage should fall be-
tween -3.85V and -4.l 5V.
Connect the meter across PEBTB 2-7 (ground) and
PEBTB 2-8 (-4V) on the printer electronics gate.
This voltage should measure between -4.
l
SV and
-3.85V.
If voltage measured in either step 3 or step 4 is out of
tolerance, readjust the -4V supply.
5.4.3 Overvoltage Adjustment
There is no field adjustment for overvoltage. It is set and
sealed at the time of manufacture. Replace -4V regulator
card if overvoltage condition fails to trip regulator. (Be
sure to check the overcurrent adjustment.)
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