- Topic ID: id_17422980
- Version: 3.0
- Date: Apr 22, 2019 12:56:12 AM
Gantry Thermal Control Troubleshooting (Cj M40)
1 Overview
This document shows some idea for Gantry Thermal Control Troubleshooting for Cj M40 system. Basically the trigger will come from gesyslog, and proposed to chase the root cause finding from Gantry Stationary side, then check the Gantry Rotational side.
2 Error case by Component
2.1 Error generated from CFC
If gesyslog message came from CFC, it’s Gantry Stationary side issue. The following component function shall be checked.
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Gantry Top Fan. This component output feedback of tacho senstor, need to confirm if Top fan error is output to gesyslog concurrently.
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Heater Blower. It has self diagnostic feature, but it work only in power up timing of CFC. Cycle power of 120VAC at Service Switch Panel will execute the diag. manually, and check gesyslog.
2.2 Error generated from Plenum Fan.
The following instruction is an example of troubleshooting guide. But there are many cases of trouble, including defect cable, defect connector, Power supply issue. It’s recommended to check connector contact, Fan check (swap power cables), etc. at first.
i.e. If error was generated from Plenum inlet thermistor, check the Gantry stationary side as same as CFC error case.
i.e. If error was generated from Plenum Fan Control (CFHC) without Chiclet temperature error, Fan itself may be defective. If it happens with Chiclet temp. error, try to do troubleshooting from Chiclet error.
2.3 Error generated from Chiclet thermal
Even if Chiclet thermal error has been found, do NOT replace Detector module. Because if Chiclet becomes defective, other test (like DAS Tool) shall be fail. Also only one Chiclet thermal sensor defect does not cause the System function.
Do NOT replace detector module to fix detector thermal error. System recovers Chiclet thermal sensor defect, no impact to system function by Chiclet thermal sensor fail. It’s recommended to check heater, plenum fan, gantry heater/blower or gantry top fan are functional.
3 Rail heater troubleshooting Workflow
Figure 1. Troubleshooting Work flow
Figure 2. Connector and pin assignment
Figure 3. Heater Wiring Diagram
3.1 Rail heater troubleshooting (System Level check)
Since CFHC does not have current sensor for rail heater, the board cannot detect the rail heater open/short issue. If one or more failure is detected, heater or thermistor may be damaged. The following material shows the heater connection wiring diagram. And System level resistance table.
3.2 Rail heater troubleshooting (Detector Level check)
The following Illustration shows the procedure of each heater check. Normal Condition, Top heater check and Bottom heater check.
Routing_check-Detector_Level_check_list-Normal_condition.pdf