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The following list describes the parts of the Model
170, shown in Figure 7-2 on page 7-3 through
Figure 7-4 on page 7-4.
Note: Only trained service technicians should work
inside the Model 170.
Serial number is located below the power switch.
Key mode switch is a key-controlled switch with
three positions, labeled:
Normal
Secure
Service.
Power switch has the international symbols I for On
and
0
for Off. When the power switch is set to On,
the power-on LED comes on.
Reset button is located next to the 3-digit display
and is labeled Reset.
Diskette drive is a 1.44-MB, 3.5-inch diskette drive
that has an in-use LED and a diskette-eject button.
3-digit display displays up to three 7-segment
characters.
Front and side covers are removable and allow
access to the inside of the Model 170. Rear cover
is removable and provides access to the Model 170
connectors.
Note: Only trained service technicians should work
inside the Model 170.
Rear cover lock provides physical security by
preventing the removal of any covers when locked.
The key mode switch and rear cover lock use the
same key. The rear cover lock is locked when the
key slot points to the locked symbol and is unlocked
when the key slot is turned clockwise to the open
symbol.
Chapter 7. Model 170 Description
7-5
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