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Starter Kit Instruction Manual Maintenance 48
Temperature Reference offset adjustment
[10] Adjust B13 (3) to 0.000 with P3 (4)
[11] Set the temperature with the Set Tem-
perature potentiometer (Fig.40 (7)) to +5
◦
C
→The temperature reference signal B13 should
be ≥4.3V
[12] Set the temperature with the Set Tem-
perature potentiometer (Fig.40 (7)) to -5
◦
C
→The temperature reference signal B3 should
be ≤4.3V
[13] Check the switch range by setting the
Temperature Reference at + 2
◦
C and -2
◦
C
B7 = -5V and +5V
B6 = +5V and -5V
[14] Check the output voltage of the transis-
tors
→ The signals on R78 and R81 should tog-
gle simultaneous ly with the inversal signals on
R79 and R80
CAUTION ! The signals B6 and B7 (2)
must never be at 0V simultaneously. Other-
wise there is a risk of short-circuit!
1
2
3
4
Fig.41: TCU151 main board