10 Maintenance
PCS-9785 Satellite-Synchronized Clock
10-2
Date: 2019-07-05
10.3 Failed Module Replacement
WARNING!
Module can
ONLY
be replaced while the device power supply is switched off.
ONLY
appropriately, trained and qualified personnel can perform the replacement by
strictly observing the precautions against electrostatic discharge.
WARNING!
Five seconds is
NECESSARY
for discharging the voltage. Hazardous voltage can be
present in the DC circuit just after switching off the DC power supply.
CAUTION!
Take anti-static measures such as wearing an earthed wristband and placing modules
on an earthed conductive mat when handling a module. Otherwise, electronic
components could be damaged.
CAUTION!
Check the device configuration after a replacement of module. Unintended operation of
device may occur.
If the failure is identified to be in the device module and the user has spare modules, the user can
recover the device by replacing the failed modules.
Repair at the site should be limited to module replacement. Maintenance at the component level is
not recommended.
Check that the replacement module has an identical module name (AI, PWR, MON, BI, BO, etc.)
and hardware type-form as the removed module. Furthermore, the MON module replaced should
have the same software version. In addition, the AI and PWR module replaced should have the
same ratings.
The module name is indicated on the top front of the module. The software version is indicated in
LCD menu “
Information
”->“
Version Info
”.
To replace a module
1. Switch off the DC power supply
2. Disconnect the trip outputs
3. Short circuit all AC current inputs and disconnect all AC voltage inputs
4. Unscrew the module connector
5. Unplug the connector from the target module.
08020
08020
08020
08020
08020
08020
08020
08020
08020