Datasheet

7.2 Calibration procedures
5. Temperature Reference offset adjustment (refer to figure 7.12)
a) Adjust B13 (3) to 0.000 with P3 (4)
b) Set the temperature with the Set Temperature knob (Fig.40 (7)) to +5
◦
C
→ The temperature reference signal B13 should be ≥4.3V
c) Set the temperature with the Set Temperature knob (Fig.40 (7)) to -5
◦
C
→ The temperature reference signal B3 should be ≤4.3V
d) Check the switch range by setting the Temperature Reference at + 2
◦
C
and -2
◦
C:
B7 = -5V and +5V
B6 = +5V and -5V
e) Check the output voltage of the transistors
→ The signals on R78 and R81 should toggle simultaneously with the
inversal signals on R79 and R80
CAUTION:
The signals B6 and B7 (2) must never be at 0V simultaneously. This
may result in a short-circuit
1
2
3
4
Figure 7.12.: TCU main board (view I).
c
2012 SA 87