6-13
8. Checking the IC Resolution Change Movement
Is there +3.3V supply on I315 pins 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 and J3?
OK
NG
Proceed "Checking the DC/DC Converter Circuit" section.
Is 24MHz clock input to I315 pin J4 at TTL level?
OK
NG
Is 24MHz clock output from X303 pin 5 at TTL level?
OK
NG
Failure point
Print wire broke between
X303 pin 5 and I315 pin J4.
Failure point
X303 failure.
Is +5.0V supplied to I315 pin T1 at
High level (Reset signal)?
OK
NG
Check the output of 5.0V "H" pulse from I301 pin 6.
OK
NG
Is 5.0V supplied to I301 pin 7?
Failure point
Print wire broke between I301
pin 6 and I315 pin T1.
OK
NG
Failure point
1) I322 failure.
2) L315 open.
Failure point
I301 failure.
Failure point
I315 failure.
Is there +2.5V supply on I315 pins D12, D14, D17, F17, K17, M17, P17,
T17, U16, U14, U11, U9, U7, U4, N4, K4, A6, A7, A8, A9, A10 and A11?
OK
NG
Proceed "Checking the DC/DC Converter Circuit" section.
Is +3.3V supplied to X303 pin 8?
OK
NG
Failure point
Print wire broke between and
X303 pin 8 and power
supply.