Tandy 1400LT Service Manual page 54

Figure 4- 19, 4-20 KEYBOARD-3, -4 show internal keyboard specification
e -
I -
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Electrical Specifications
rn
Intermediate region
1 Maximum Rating
12 V DC, 5 mA
2 Contact Bounce 5 m sec. Max (at normal pushing)
3 Contact Resistance 300 m Ohm Max.
(at 10 million times operation, -5 Ohm
Max.)
4 Insulation Resistance 50 m Ohm Min. (at 250 V DC)
5 Withstand Voltage 250 V AC, 1 minute
6
Circuit Make contact, 1 circuit
Mechanical Specifications
1 Operation Force 35 grf
(MAX: first stage 50
k
150 grf
I
200grt
:::p
life stage
40 f 15 grf)
(MIN: 26
-t
19 grf)
0
0.05mm
-
2 Full Travel 4.0
-t
0.5 mm
Full Travel
3 Operating Point
Endurance Specifications
12V DC 5mA 10,000,000 times
24V DC 10 mA
1 Operation Life
5,000,000 times
2 Operation Temperature Range -5°C
-
+5"C
3 Storage Temperature Range
-
20°C
-
+
65°C
Figure 4-19. KEYBOARD-3 (Internal Keyboard Specification)
4-17