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6. Show "No Signal" on screen
(Test pattern: 32 gray 1280X1024 60HZ)
Check the HS and VS is
FIG 6. and FIG 7.
7. Keypad can not work
YES
Failure point
1. IC400 pin 1, 4, 42, 43, 46,
47, 125,206 failure
2. TACT switch failure
ViewSonic Corporation
Check the signal level of R610,
R611, R612 is FIG 5.
YES
NO
Check that the cable is
fully connected between
the Interface board and
Key board
NO
Failure point
1. The video connector is disconnected
2. Signal cable is disconnected
NO
Failure point
The cable is disconnected
Confidential – Do Not Copy
VX700-3
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