XW-HTP550
37
5
6
7
8
5
6
7
8
C
D
F
A
B
E
Check the circuits around Q3305
and Q3511.
IC3302
STANDBY(pin 5) : "H"?
MUTE(pin 6) : "L"?
No
No
Yes
Check the audio lines sequentially
from jumper lead to amplifier input
(IC3302 pin 2 and pin 4).
It is most likely that the RX module
or Transmitter section is in failure.
The +B and ground circuits are
most likely to be short-circuited,
or IC3302 is likely to be broken.
Detach the
RX module, then by
inputting an audio signal to the
jumper lead for servicing(
*
2),
check if sound is
output.
No
sound
Sound is output.
Are the IC12 and
IC13 in MAIN Assy
broken?
Yes
To diagnosis of the Transmitter section
(A)
(B)
(
*
2)
See page 39.
(2-2) In a case where no sound is output
