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REV.-A

Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued)

Problem

Symptom

Cause

Checkpoint

Solution

~bnormal

The CPU

The CPU is

Check the oscillator signal

(IC2CI pin 27 or pin

If the signal

)peration

at

does not

defective.

28).

is not correct,

)ower on.

operate

replace

properly.

IC2CI .

Otherwise,

replace CR1.

CHI=2V

TIME=O.lVS

1 1

[

1

;arriage

The carriage

IC6

is

Check the input signal (pin 5) and the output

Replace IC6.

operation

does not

defective.

waveform (pin 8).

~bnormal.

operate at

all.

—(

CH2:PIN

8)

%

B

*

q

w

i

$

!

l–

–,

s

I

~

‘

f ‘

!

-

~

u

?

-

-

-

-

I I I

I

I

I

II

Ill

I

1

I

I

1+1

I I

I I

I

I

I

II

II

II

I I

I

I

I I I

1+

(CH1:

PIN

5)

-

falw

w

~

d

~

L

k

L

CHI=5V

CH2=50V

TIME= O.5ms

I

I

1

[

1

i

5-15