KE-750_QA表.pdf - 第83页
FUNCTION NAME Vacuum Natural Breaking Ti me Function/Performance CHECK/ADJUSTMENT MET HODS (REMEDIAL ACTION PROCEDURE) ASSURED QUALITY Reliability QUALITY CHARACTERISTI CS (SPECIFIC ATION VALUES) CATEGORY Safety Product …
FUNCTION NAME Vacuum Natural Breaking Time Function/Performance CHECK/ADJUSTMENT METHODS (REMEDIAL ACTION PROCEDURE)
ASSURED QUALITY Reliability
QUALITY CHARACTERISTICS (SPECIFICATION VALUES) CATEGORY Safety
Product Image
ROLE IN FUNCTION (MEANING OF SPECIFICATION VALUES)
POSSIBLE MALFUNCTIONS (CAUSED BY INCORRECT SPECIFICATION VALUES)
COMPONENTS
NO. Part No. Part Name Associated Quality Characteristics
1
2
3 MODEL KE-750/760
4 UNIT Electrical REF. NO.
5
NAME
EL-12
6 FUNCTION Vacuum Natural Breaking Time
7
NAME
8
9
10
QA Table
1. Fit the jig pressure sensor to the end of the nozzle.
Vacuum natural breaking time ≤ 70 msec.
2. Connect the jig pressure sensor to the head main board.
Vacuum natural breaking time refers to:
L head - CN17
"Time T it takes the vacuum at the end of the nozzle to return to atmospheric pressure after the Vac SV OFF timing."
C head - CN19
R head - CN18
3. Turn ON vacuum SV, then turn it OFF. Measure the time it takes the jig pressure sensor output to reach the atmospheric
level as counted from the OFF timing.
Vacuum level
Concerned with the pickup force at component placement, it affects placement accuracy.
1. A standing chip at component placement
2. Degraded placement accuracy
