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Check point
Normal voltage and waveforms
JX-W9
Adjusting point and defect
C6 pin 10
(TC4001BP)
19. Auto Cross
Input mal-
function.
® Auto wipe does
not function.
Mode:
Auto
Cross Input
Wipe pattern:
Select any one
@\|n the Auto
Cross Input
mode, inputs
1/2 are not
changed.
hase pin 2
Press START.
(TC4013BP)
1C59
pin
Press START.
(uwPC358 C})
—|—
I1C56 pin
Press START.
(uPC358 C)
IC56 pin7
START ON
Same waveform as above.
@ Check voitage from connector CN42-2
or CN19-2 to IC6 pin 9.
*L (0.7 V) is O.K.
NO:
Check V gate according to
"Switching Truth Table'.
: @Check "Wipe Gate Logic Diagram".
H level goes low
NO:
YES:
@ Check whether |C69 pins 5, 6, 4 are H
er not,
@ Check whether |C70.pin 3 goes H by
switching ON,
Check @ .
DC 10,9 V is changed to DC1.3 V,
NO:
then
DC 10.9 V resumes,
| YES:
@ Check that Q100 base and collector
are 11.5 V.
@ Check that [C58 pin 2 goes high from
low.
eCheck @.
1C59 pin 1
O2V
NO:
TP20
-
YES:
1C56
pint
START ON
* Adjust VR44 so that the voltage
of TP21 is 0.2 V lower than the
max. voltage of TP20.
ICB9 pin 1
TP20
1C56
pin7
I
START ON
* Adjust VR43 so that the voltage
of TP22 is 0.2 V higher than the
max. voltage of TP20. -
i
© Check voltages of |C56 pins 1, 2, 3.
© Check @.
@ Check IC56 pins 5, 6 and 7.
: @Check @.
ICB7 pin 1
START ON
(TAS458P)
DC 10.9 V is lawered toDC1.3V,
then
DC 10.9 V resumes,
@ Check voltage changes of IC55 in/out
pins 10,11.
Check that. gate pin 12 isH.
@ Check voltage changes of C59 pins
5, 6, and 7, and voltage change of |C57
pin 3.
eCheck that 0112 base is H.
IC68 pin3
1C70 pin 13
@ Check voltages and waveforms of iC64
pins 4,5, and 6, and in the vicinity of
IC66.
,
e Check I|-C68 pins 1, 2, 3 and |C67 pins
11,12, 13,
: @Check
8.
@ Check that IC69 pin 13 is H.
(Auto Cross Input: ON)
Check voltages in the vicinity of IC70.
: eCheck connector CN25-1, 2 and lead
wires,
eCheck that [C27 gate pins 13, 5 are
inverted to H/L respectively.
(No. 70053) 17
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