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11. TROUBLESHOOTING
11.1 Symptoms
CD
When power switch is turned ON, the
unit does
not operate.
NO.
Cause of
Trouble
Check
Point
1
AC adaptor
Disconnect
the connector (CN112) and
check for voltage on pins 2-3 for approx.
9V
DC using
a voltmeter.
0
If
the
voltage is okay and the unit does not operate.
NO.
Cause of Trouble
1
MAIN
PCB
power
lines
2
Reset Circuit
3
CPU periphery
4
Expansion RAM
(KX-W60TH
only)
Check
Point
Check
the
Main PCB power lines vol-
tage
reading
between the
test
points
TP3
and
TP7
:
approx. 5.3V DC.
Voltage reading between the test points
TP4
and
TP7
:
approx. 9.5V
DC
.
Voltage
reading
between the test points
TP5 and TP7: approx. 6.0
-
7.7V DC.
Voltage reading between the test points
TP6 and TP7:
app rox.
-2V
DC.
Check PIN
No.
6 of the CPU (IC101) at
test
point
TP2.
Normal
state
is
H
(high).
Check E pulse of the CPU (PIN No.
64
of
IC101)
at the
test
point
TP1.
Frequency
of E pulse is 1 MHz.
When Expansion RAM is used, check
the Expansion RAM.
-
46
-
Repa
ir
Method
If
voltage reading
is
incor-
rect
, check
the
power
switch.
If
the
power
switch is okay, AC adap-
tor
may be
faulty.
Repair Method
If
the Main PCB power
lines
are
not
correct,
power
lines
are opened
or short circuited.
If reset pulse is not
cor-
rect, check the Reset Cir-
cuit.
If
rese
t
pulse
is okay,
check
the
oscillator
(X101 ).
If E
pulse is okay,
check
the
LCD.
If
the
LCD
is
okay,
CPU
periphery is faulty.
If Expansion
RAM
is
not
inserted
correctly,
install
the Expansion
RAM
cor-
rectly.
CT)
Head Press
So lenoid
does not move correctly.
NO.
Cause
of Trouble
1
Head
Press
Solenoid,
Drive circuit or
Logic
cir-
cuit
Check
Point
Check waveform of
IC112
Pin
(i)
of IC112
---'n~--
Pin
@
of
IC112
__n__
@
Correction Motor does not move correctly.
NO.
Cause of Trouble
Correction
Motor,
Drive
circuit or
Logic
circuit
Check
Point
Check waveform of
IC113
Pin
(i)
of
IC113
_jLJL_
Pin
@
of
IC113
_n__Jl__
-
47
-
Repair Method
• If output waveform is
okay,
check
the con-
nector
(CN110).
• If output waveform and
connector are okay, the
Head
Press Solenoid
is
faulty.
•
If
output waveform is
bad,
IC112
is faulty.
• If input waveform is
bad,
CPU periphery is
faulty.
Repair Method
•
If
output waveform is
okay,
check connector
(CN111).
• If output waveform and
the connector
are
okay
,
the
Correction Motor is
faulty.
•
If
output waveform is
bad,
IC113
is
faulty.
•
If
input waveform
is
bad,
the CPU periphery
is faulty.
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