Checking The Resolution Change Ic Movement - NEC NMV 1700V Service Manual

8. Checking the resolution change IC movement

Is there +3.3V supply on I315 pin D13, D15, D16, E17, G17, J17, L17, N17, R17, U17, U15, U13,
U12, U10, U8, U6, U5, T4, L4, B2, B6, B7, B8, B9, B11, C3, D3, E3, F2, F4, G1, G3, H1, J1, J3.
NG
OK
Is there +2.5V supply on I315 pin D12, D14, D17, F17, K17, M17, P17, T17, U16, U14,
NG
OK
Is 24MHz clock input to I315 pin J4
at TTL level?
NG
OK
Is +5.0V supplied to I315 pin T1 at
High level (Reset signal)?
NG
OK
Failure point
I315 failure
Print wire broke between I301 pin 6
Trouble Shooting
Proceed "Checking the DC/DC converter circuit" section.
U11, U9, U7, U4, N4, K4, A6, A7, A8, A9, A10, A11.
Proceed "Checking the DC/DC converter circuit" section.
Is 24MHz clock output from X303
pin 5 at TTL level?
Is +3.3V supplied to X303 pin 8?
OK NG
Failure point
Print wire broke between X303 pin 5
and I315 pin J4.
Check the output of 5.0V "H" pulse
from I301 pin 6.
NG Is 5.0V supplied to I301 pin 7?
OK
Failure point
and I315 pin T1.
NG
OK Print wire broke between and X303
pin 8 and power supply.
Failure point
X303 failure
Failure point
NG
OK 1) I322 failure
2) L315 open
Failure point
I301 failure
NMV 1700V
Failure point
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