Epson LX-86TM Especificaciones descargar pdf (Pagina 113)

REV.-A

Table 5-5. ROCX Board Unit Repair

Problem

The printer does

not operate at all.

(The power lamp

on the control

panel does not

light.)

● The l/F cable is

disconnected.

Cause

Checkpoint

Solution

Symptom

The

+24V

DC

Check fuse (Fl) on the

ROC

Filter unit.

Replace F1.

ROC

filter unit is

defective.

line is dead.

Measure the output volt-

age of

ROC

filter unit. Re-

fer to Table 2-2.

Measure the resistances

of R21 and

R66.

R21:

3160

R66:

O.1f-1

Replace the

ROC

filter unit.

Replace the R21

or

R66

Resistors are

open.

Replace the

IC3A, Q25, Q24,

or Q23.

Measure the wave-form

of

IC3A or Swithcing

transistors. Refer to Fig-

ure 2-9.

Switching regula-

tor

IC

or Switching

transistors are

defective.

Measure the voltage of

IC3A Pin 8.

(Pin 8 =

20VDC)

Replace the

IC3A

or

Q22.

Fuse

(F2)

is open.

Check fuse on the

ROCX

board.

Replace F2.

Replace

SR1,

Q20, or Q21.

Measure the waveform of

SR1

and Q21.

The

+5V

DC

line is dead.

Switching regula-

tor

IC

SR1

or

switching transis-

tors are defective.

Resistor is open.

Measure the resistance

of

R13.

R13:

2Q

Replace

R13.

Reset circuit is

dead.

+24V,

+5V

line is

defective.

Check the

+24V,

+5V

line.

Gate array (36) is

defective.

The

ROM is

defective.

The

Gate array is

defective.

Check the level of IC3B

Pin 25.

In operating: High

Replace Gate ar-

ray (3 B).

The printer

mechanism

does not initial-

ize at power on.

Check the pin insertions

of ROM.

Check the level of IC3B

Pin 25.

In operating: High

Replace ROM

[3 C).

Replace Gate ar-

ray

(3 B).

5-12

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