107
Unit Operation Checks
12. PCB ASSY,DI CTRL-A
Outline
DI CTRL-A has the next function.
There is a illumination of amplification and, LED of the heat electromotive force of heater
voltage occurrence and, TC of DI probe and it is the function such as the recognition of a DI
option furthermore.
DI option is recognized when the circle style connector of the tip of the cable that is out from
the DI introduction is connected to a DI CTRL-A foundation.
This recognition is conducted, when draw out a circle style connector and also shone.
The condition of DI probe is not related.
When DI probe is inserted and a temperature program be started,
Producing the voltage corresponding to the Duty ratio of the PWM signal that is sent from a
CPU it supplies it to a heater. The heat electromotive force of TC that was built to probe is
amplified with an amplifier 200 times.
It is used to temperature measurement.
Action confirmation method
There be some abnormality and please do with the following procedure in the case that the
action of DI CTRL-A is confirmed.
Rationally malfunctioning normal judgment is possible.
１．Confirmation of power supply voltage
CP5 +15V （+14.25V〜+15.75V is normal）
CP6 -15V （-14.25V〜-15.75V is normal）
CP8 +24V（+22.7V〜+25.3V is normal）
0V with CP7, CP9
２．Confirmation of heater voltage
CP3[+19VD]：+19V If this voltage is constantly be not out ,it is not possible heater heating.
It is the abnormality of a DI CTRL-A foundation.
It is as follows during DI probe heating.
CP2[PWM-DI]：Frequency 50kHz PWM wave-like between voltage level+19V/24V
CP4[V-HT]：
Heater voltage of probe
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