XW-HTD640
57
5
7
8
5
6
7
8
C
D
F
A
B
E
7. GENERAL INFORMATION
7.1 DIAGNOSIS
7.1.1 TROUBLESHOOTING
YES
YES
YES
NO
NO
NO
YES
NO
(1) No power (POWER LED not lit)
No power (POWER
LED not lit)
Has the
fuse blown?
PROTECT
activated
Diagnose the unit, referring to the explanation
of the Protection function.
Replace fuse
FU1.
Is the POWER
LED lit?
Has the fuse been
blown again?
Completed.
Check if there is
short-circuiting.
Short-circuiting bB
and GND is highly likely:
POWER ASSY : CN12
MAIN ASSY : CN3304,CN3305
AMP ASSY : CN3302
REGULATOR ASSY : CN3303
(2) No sound
No sound
Check the voltage at each
part in the module.
Check the voltage at the following parts:
• Transmitter:
TX ASSY: CN8201 (Pin 11)
U6 (5V) [T22]
U17 (5V) [T33]
U21 (5V) [T17]
U22(3.3V) [T20]
• Wireless speakers
MAIN ASSY: CN8201 (Pin 1),
RX module: D16 cathode
D16 Cathode [T32]
U12 (5V) [T25]
U19 (3.3V) [T35]
Note: The numbers in brackets are for
the test terminals in the module.
• Wireless speakers
R52
→
U2 (Pin 76)
→
U28 (Pin 7)
→
CN3701 (Pin 5)
→
IC3001 (Pin 13)
→
CN3304 (Pin 1)
→
CN3306 (Pin 5)
• Transmitter
JA8202
→
CN8201 (Pin 6)
→
U9 (Pin 2)
→
U1 (Pin 76)
→
R74
In a case in which no sound is output from the AMP module
Besides the failure in the POWER IC, activation of the
MUTE function is possible. Check that Pin 6 of CN3304 is "L"
and that Pin 4 of CN3304 is "H."
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