5.8 Checking the resolution change IC movement
Isthere +3.3V
SuppliedonI314pin107,
pin48,pin61, pin250, pin12, pin70,
pin170,pin184, pin203, pin216,
pin236,pin252, pin20, pin28,
pin38,pin19, pin37,
pin131?
Isthere +1.8V
suppliedon I314 pin16, pin22,
pin50,pin2, pin78, pin96, pin143,
pin160,pin181,
pin225
Proceedto “5.9 Checking the DC/DC converter
circuit”section
Proceedto “5.9 Checking the DC/DC converter
circuit”section
NG
NG
OK
OK
Is14.318MHz
clockinput to I314 pin35
andpin36 at TTL level
duringpower on?
Is14.318MHz clock output
fromX302 pin1 at TTL level
duringpower on?
NG
FailurePoint
X302is defected.
Checkthe output
of3.3V “H” pulse from
I306pin12
Is+3.3V supplied to
I314pin9 at low level
(Resetagain)?
FailurePoint
I314is defected.
OK
FailurePoint
I306is defected.
NG
NG
FailurePoint
Printwire is broken between I306
pin12and I314 pin9.
FailurePoint
Printwire is broken between X302
pin1and I314, pin36
OK
OK
27
Go to cover page
5.Troubleshooting (continued)
ACERG24