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5.6 ADJUSTMENT OF THE -30 VOLT POWER SUPPLY
See paragraph 4.2 for adjustment of the -30V power supply.
5.7 POWER CHECK LAMP
The power check lamp comes on during power on sequence
and goes off when the power on sequence is completed. It
also comes on when an overtemperature condition occurs
or whenever any power trouble is present. (See Figure 5-6
for power check/thermal light characteristcs.) A power on
reset occurs every time the power check lamp comes on.
The power check lamp stays off if the 24 V de output of the
control transformer/rectifier pack (T/R Pac) is missing.
(Refer to Figure 5-5 for test points (TPs) for the power
system.)
The machine powers down in any of the conditions de-
tected in TPl0-14. Twenty-four volts
will
be readable in
TPI0-14 until a check reset switch is pressed. Loss of either
the
-4
V or +6V while the machine is running powers down
the system and 24V
will
be present at TPl0-14 (Figure 5-5).
Loss of -30V or +24V while the machine is running
will
not cause power down but the powe•on reset
will
stop
operations of the machine.
If the power on sequence is not completed, the power
check lamp
will
remain on and the TPs from TP2 to TP9
will
indicate where the sequence stopped.
5.8 24 VOLT CONTROL VOLTAGE
If the 24 volt control supply is questionable when ex-
periencing power on problems, a quick service check for
this 24V supply can be made by pressing the lamp test
switch while power is off and observing the thermal check
and power check lights. If they light, the 24V supply is
present.
POWER ON/
INDICATORS
FAULT
OFF SWITCH
ACTION
POWER CHECK
THERMAL
Internal Power
On
On
Off
1. Turn power off.
Supply Malfunction
2. Correct problem.
3. Press check ''set.
4. Turn power on.
Thermal
On
On
On
1. Turn power off.
Condition
2. Power check indicator
goes
off.
3. Thermal light stays on until
condition is removed.
Customer Power
On
On
On
1. Turn power off.
Source Loss
2. All indicators turn off.
3. Turn power on and continue
operation.
Emergency Power Off
On
Off
Off
1. Turn power off.
(EPOI Activated
2. Correct problem.
3. Restore EPO interlock.
4. Turn power on.
Figure 5-6. Power Check/Thermal Check Indications
5410 FEMM (1/71) 5- 7
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