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5
(2-2) In a case where no sound is output
QQ
3 7 63 1515 0
RX side
Are the protection
circuits in IC12 and
IC13 broken?
The +B and ground circuits are
most likely to be short-circuited,
or IC3302 is likely to be broken.
TE
7.1.3 POWER ON SEQUENCE
L 13942296513
RESET START
Intitialization of the
system microcomputer
Line test mode
distinction
Intitialization of the
VOLUME IC(IC1751)
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.
5
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No
Yes
It is most likely that the RX module
or TX section is in failure.
To diagnosis of the TX section
POWER ON
DSP starting
x
ao
y
Canceling of
i
MUTE
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6
8
Is Pin 5 of IC3302
No
"H" and Pin 6 "L"?
Yes
Detach the
RX module, then by
inputting an audio signal to the
jumper lead for servicing,
check if sound is
output.
Sound is output.
Q Q
3
6 7
1 3
• A pin number is a terminal number of
the system microcomputer PDC 118.
XRESET (Pin 2) terminal is set to Hi.
TEST (Pin 4) terminal is Lo, it will become line test mode.
It is a communication start because of initialization
of VOLUME IC. (43,44,45pin)
SRESET (Pin13) terminal is set to Hi.
DSP IC and a communication start. (9,10,11,12pin)
In the power ON, it is each MUTE
release after about 5 seconds.
u163
XSYSMUTE (38pin) terminal is Hi.
XWMUTE (42pin) terminal is Hi.
.
XSWMUTE (37pin) terminal is Hi.
However, when volume is "0", it does not cancel MUTE.
XW-HT1
6
7
2 9
9 4
2 8
Check the circuits around Q3305
and Q3511.
No
sound
Check the audio lines to narrow
down the point in failure.
1 5
0 5
8
2 9
9 4
m
co
7
8
9 9
A
B
C
2 8
9 9
D
E
F
57
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