NEC NC1600C Service Manual page 126

Tamper-Switch Activation Detected
Are external screws tightened?
Yes
Is there any abnormality in the lid of the TI Chest?
Yes
Is there any abnormality between the PJKEY PWB
and the TAMPER PWB, such as drawing out of the
connector?
Yes
Look for any damage or the drawing out of the
connector and follow the steps of replacement
work in the order specified below.
TAMPER PWB
PJDIV PWB
CPU PWB
INTERFACE Board
"Confidential, Do Not Duplicate without written authorization from NEC."
TROUBLESHOOTING
No Adjust the problem points.
Adjust the problem points.
No
Adjust the problem points.
No
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