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5.4.4 Undervoltage Adjustment
There is no field adjustment for undervoltage detection. It
is set and sealed at the time of manufacture.
Note:
A
-4V supply undervoltage condition (less than
-3.SV) results in a +6V supply failure indication (TPI3 =
+24V, Figure 5-5).
5.5 ADJUSTMENT OF THE +6 VOLT POWER SUPPLY
5.5.1 Voltage Adjustment
I.
Connect meter between brass plate
#3
(+6V
terminal) and brass plate
#
I (ground terminal) be-
hind the
CPU
console.
2.
Set voltage adjustment potentiometer (Figure 5-4)
for +6V.
Note: This adjustment has no plus or minus
tolerance. Set as close to +6V as possible.
5.5.2 Overvoltage-Overcurrent Adjustment
There are no field adjustments for overcurrent or over-
voltage in this power supply. They are set and sealed at
the time of manufacture. Replace +6V regulator card if
overcurrent or overvoltage conditions fail to trip the regu-
lator.
5.5.3 Undervoltage Adjustment
There is no field adjustment for undervoltage detection. It
is set and sealed at the time of manufacture.
Note: A +6V supply undervoltage condition (5.28 Vdc)
results in a +30V supply failure indication (TP14 = +24V,
Figure 5-5).
5-6
(1/71)
Test
Relay
Type of
Point
fl
Failure
TP
@1
-
-
TP
K5
Sequence
@2
TP
K17
Sequence
@3
TP
K19
Sequence
@4
TP
K6
Sequence
@5
TP
KS
Sequence
@a
TP
K10
Sequence
@1
TP
K11
Sequence
@s
TP
K30
Sequence
@9
TP
K18
OV/OC
@10
TP
K16
OV/OC
@11
TP
K13
OV/OC
@12
TP
OV/OC
@13
K14
UV
TP
OV/OC
@14
K15
UV
Read 24Vdc at TP2-9 when
indicated voltage is missing.
Read 24Vdc at TP10-14 when
indicated fault condition occurs.
(24 Vdc is present in TP2 also.)
Note: 24Vdc is normally at
TP2 when CB-1 is on and the
power on/off
s~itch
is off.
Figure 5-5. Power Supply Test Points
Supply
0.ecked
+24V Ground
-4V Basic logic supply
(includes add-on)
-4V Logic supply
fl2
Feature (B gate)
-4V Logic supply
#3 Feature (B gate)
+6V Basic
-30V Basic
+24V Basic
(located in MFCU)
+60V Basic (located
in 5203 Printer)
Feature PIS
-4V Logic supply
#3 Feature (B gate)
-4V Logic supply
fl2
Feature (B gate)
-4V Basic logic supply
(includes add-on)
+6V Basic
-4V Basic
-30V Basic
+6V Basic
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