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5.3.2.7 Model 1 Ferro Transformer (50 Hz)
,. Unplug ferro transformer cable that plugs into LV power
supply printed circuit board.
2. Remove the two wires from ac capacitor.
3. Refer to Diagram 8-1. Disconnect two wires leading
from ferro term inal block (TB 1) to prime power box by
turning cam screw counterclockwise only. Note where
wires were terminated (for later reconnection).
4. If a card reader is attached, disconnect two wires leading
from ferro terminal block to card reader I/O connector.
Note where wires were terminated (for later recon-
nection).
5. Remove rear screw that holds transformer to base
chassis.
6. Remove front holding screw.
7. Lift transformer clear of mach ine.
8. Replace in reverse order. When connecting wires to
terminal block, cam screw must be turned clockwise.
5.3.2.8
Model
2
Ferro Transformer (60 Hz)
1. Disconnect LV cable connector (J2) between the two
chassis.
2. Remove all I/O connectors (keyboard, card reader,
I/O).
3. If a card reader is attached, unplug cable from rear of
prime power box.
4. If a selector-pen is attached, remove cable from clip at
lower right rear of frame.
5. Release the two clamps at sides of chassis that hold
upper chassis to base chassis.
6. Release spring catches on rear guides, and slide upper
chassis slightly to front to disengage the two rear
guides.
7. Lift upper chassis off base chassis, and place upper
chassis on a flat surface.
8. Remove ac capacitor per paragraph 5.3.2.3.
9. Remove screw holding ferro cover, and remove cover.
10. Disconnect the two cable connectors leading from ferro
transformers.
11. Remove the two screws holding ferro to base chassis.
12. Slide transformer out of housing and clear of chassis.
13. Replace in reverse order.
5.3.2.9
Model
2
Ferro Transformer (50 Hz)
1. Disconnect LV cable connector (J2) between the two
chassis.
2. Remove all I/O connectors (keyboard, card reader,
I/O).
3. If a card reader is attached, unplug cable plugged in
ferro transformer cover.
4. If a selector-pen is attached, remove cable from clip in
lower right rear of chassis.
5. Release the two clamps at side of chassis holding upper
chassis to base chassis.
6. Release spring catches on rear guides, and slide upper
chassis slightly to front to disengage the two rear
guides.
7. Lift upper chassis off base chassis, and place upper
chassis on a flat surface.
8. Remove ac capacitor per paragraph 5.3.2.3.
9. If a card reader is attached, remove access cover on
ferro cover over ferro terminal block (Diagram 8-1),
and disconnect two wires leading from terminal block
to connector on ferro cover by turning cam screw
counterclockwise
only.
Note
where
leads were
terminaled (for later reinstallation).
10. Remove screw holding ferro cover and remove cover.
11. Disconnect the two wires leading from ferro terminal
block to prime power box by turning cam screw
counterclockwise only. Note where leads are ter-
minated for later reinstallation.
12. Remove the two screws holding ferro to base chassis.
13. Slide transformer out of housing and clear of chassis.
14. Replace in reverse order. When connecting wires to
terminal block, cam screw must
be
turned clockwise.
5.3.2.10 High- Voltage Power Supply
1. Disconnect anode lead from CRT.
2. Unplug input cable at lower edge of HV assembly. Note
where leads are terminated (for later reconnection).
3.
Remove mounting screw.
4. Lift power supply clear of machine.
5. Replace in reverse order. Ensure that anode lead is
firmly seated in CRT bell.
5.3.2.11
Fuses
1. Determine which fuse is blown.
2. Replace blown fuse with another fuse of same value.
3. Turn power on.
4. Check that fuse does not blow again.
Note:
The +8V, -12V, and 6.3V ac fuses are held in fuse
clips located on the LV power supply printed-circuit
board. Remove plastic shield over the LV power supply
board on Model 2 display stations to replace these fuses.
The ac line fuse is located in a screw-type fuse holder on
the prime power box. The +5V and +34 V fuses are
located at:
I
+5V (Model 1):
A/F 1
+34V (Model 1): A/F2
+5V (Model 2):
01
elF
1
+34 V (Model 2): 01 C/F2
5.3.3 Analog Components
5.3_3.1
CRT
Diagram 7-3.1
Diagram 7-5.1
I
DANGER
All persons handling a CRT or who are near an exposed
CRT under vacuum must wear safety glasses and
long-sleeved garments.
Checks, Adjustments, and Removals
5-11
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