
REV.-A
5.3.2
Board Unit Repair
If trouble occurs with the
board, troubleshoot it as described in Table 5-8.
Table 5-8.
Board Unit Repair
Problem
Symptom
Cause
Checkpoint
Solution
The printer
VX does not
The VX
Check that transistor Q5 is on.
ON : Replace
does not
reach 5 VDC.
eration
operate at all.
is
OFF: Replace
(The POWER
Q5 or ZD8.
LED
The RESET
The reset
Check that pin 21 of the
is HIGH
Replace the
is lit.)
signal is not
is
canceled.
No
The program
Check that the (6A) inserted correct-
Replace
is
ROM is
(6A).
initialized at
defective.
all
(the printer
T h
e
is
Observe the waveforms at pins 16
and
Replace the
does not
defective.
(–) of the
(see Figure 5-7).
or
operate at
CR1.
all).
The printer is
No
The carriage
Check that phase switching signals are
Replace
initialized,
is
does not
sent from pins 62, 63, 64, and 1 of the CPU
either the
but enters an
initialized at
move at all.
to the (1A) via the
when the
(lB),
(1A),
error state.
all (the buzzer
printer power is turned on (see Figs. 2-58
or
rings five
and 2-59).
times).
The CS drive
Check that phase switching signals are
Replace the
lever does
sent from pins 2, 3, 4, and 5 of the CPU
not move up
to transistors Q24, Q25, Q26, and Q27
ing element.
or down.
when the printer power is turned on (see
Figs. 2-66 and 2-67).
The C. G.
Check that the
(3A) and
(4A) are
Replace the
ROM is
inserted correctly.
(3A) or
defective.
(4A).
Printing
A specific
The
(2A)
Observe the waveforms to check that the
Replace the
ity is not
dot is
or drive
output voltage between the emitter and
good.
ing.
sister is
collector of the drive transistor for the
ing defective
defective.
specific dot and the corresponding output
element.
signal of the
(2A) synchronize
(see Figure 5-8).
Printing is
The (2A) is
the waveform to check that the
Replace the
not
defective.
head coil drive pulses are sent from HPW
(2A).
ed.
(pin 31) through VSS (pin 9) of the (2A).
5-20
Содержание LQ-1060
Страница 1: ...EPSON TERMINAL PRINTER L Q 8 6 0 1 0 6 0 TECHNICAL MANUAL ...
Страница 5: ...REVISION TABLE REVISION DATE ISSUED I CHANGE DOCUMENT I I 1st issue I v ...
Страница 68: ...cc o REV A N N n 1 cc b I al cc u co n4 2 1 Figure 2 14 Main Switching 2 21 ...
Страница 79: ...REV A Table 2 20 State of Module 1 1 I W stay E H H L H d O s H H 4 2 32 ...
Страница 203: ...Figure 5 6 MONPS MONPSE Board Voltage Waveforms 5 17 ...
Страница 204: ...REV A Fiaure 5 6 MONPS MONPSE Board Voltage Waveforms z L 5 18 ...
Страница 205: ...Figure 5 6 MONPS MONPSE Board Voltage Waveforms 5 19 ...
Страница 217: ... n 3 m I BUS CONTROL 1 LJ Pc II SYSTEM CONTROL I I L 1 I PERIPHERAL BUS IIF u lJ Figure A 2 PD78213 Block Diagram A 3 ...
Страница 248: ...REV A A 3 DRAWINGS 3 J32 J TI g 4 Figure A 27 MONPS Board Component Layout A 34 ...
Страница 249: ... J30 33r J32 d m b13 G a TI 7 IC20 r El m J24 C2 L cl mow B L U E u Figure A 28 MONPSE Board Component Layout A 35 ...
Страница 250: ... 2 1 1 1 1 I A b 2 Ozaz 1202 C O ZZH Z UOEE vu I 1 Figure A 29 MONPS Board Circuit Diagram ...
Страница 251: ...REV A 1 UXZO xl OX 9 xl Onz b 8M 118 en A N J 93 T 818 Figure A 30 MONPSE Board Circuit Diagram A 37 ...
Страница 252: ...L t g Figure A 31 JUNMM Board Component Layout A 38 ...