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POWER SYSTEM SERVICE CHECKS
• Figure 112 shows the power-on sequence.
• Figure 113 shows the power-off sequence.
• YB401 shows how to adjust the overvoltage refer-
ence potentiometers.
Open
This supplies 25v bias
Pick K20, 29 and 38
1
to regulators and
Pick K3, Pick Adapter
+20vond -20v to
Relays Kl2-K18,
overvoltage/undervoltage
L..:.P~ic::,k.,::K~2~3
• ._ _ _ __.
No
No
Pick K4 Input to Inv/•
Conv Sq Wave to Group I
Check
Circuits
Check
Interlocks
Wait 5 sec;
if longer,
check delay
rela circ:
i~
+9 Levels Up, Pick K31
-3, + 6 vdc on Req (I)
-3 Levels Up, Pick K32
6vot5.2v, Pick K35
Converter-Inverter
When the converter-inverter fails, the circuitry can
be checked rapidly with an oscilloscope and an ohm-
meter. The oscilloscope is used to check the silicon-
controlled rectifier (SCR) gate signals and the ohm-
meter is used to check the other rectifiers.
Pick Kl
Group 111
4-60voltsupplies+30vol"'l-------------
Ono
vol._ Up, Pick K33
All voltages Up,. Pick K34
No
Check Group 111
>----t
Supplies and
Circuits
Group Ill . . . . . - - - - -
~.:~~ S~~=~
1----..!.NO!llt'
If Longer.
Group I Vo I
togos
1-12 volts Rl2
1-3 volts R7, RIO
3+3 volts R2,
RS, R6
4+6 volts RI,
R3,
R4, RS
Group
Voltages
I+ 18 volts Rl3
Group 111 Voltag"
Send Reset
To System.
01C-MC38G4
Emu la;;----,
I
2 60 volts Z vol'-• Rl5, Rl7
1-12 Volts Rl8
I
2 56 volts X-Y voltages R 14, R 16
1+3 Vol II Rl9
I
,__1 _+_30_vo_11s_R_11 _ _ _ _ _ _._ __
1+0_v~~ ~
..J
K 19
K33
S
S.c ofter
Picks
Picks
60Zl =40 Volts
Check +Voltages
>=------<and +AND
1-----~
OICMK3D07~~
OlCA4C38G4
------~
FIGURE 112. POWER ON SEQUENCE
120
(3/71)
Model 50 FEMM
Sense Circuit
Chock -Voltages
>"~---~ond-AND
1-----......
Sente Circuit
Chock
+6v
~~----1
and Under-
voltage Circuit
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