Toa IR-200M, Service Manual

Page: 10 / 24

IR-200M, IR-300M Y
10 10 TROUBLESHOOTING
• IR-200M
Microphone audio signals
not output.
DC/DC converter's
output voltage is 5.0 V.
(C113 + terminal)
Reset terminal
of the CPU is maintained at H.
(TP105, Pin No. 8 of
the M100)
Yes
Yes
Yes
Clock
(6 MHz) is oscillating.
(Pin No. 3 of the
M100)
No
DC/DC converter (M102) or power
switch (SW102) may be failed.
No
Reset circuit (M101) may be failed.
No
Clock oscillator (X100, M100) may
be failed.
Yes
VCO is oscillating.
(TP5)
No
VCO circuit (Q2) or buffer amplifier
(Q4) may be failed.
Yes
Transmitting
frequency is normal.
No
Clock oscillator (X100) or PLL
synthesizer (M4) may be failed.
Yes
RF output is normal.
(TP200, TP201, TP202)
No
RF amplifier (M200, M201, M202)
may be failed.
Audio frequency circuit
(M300, M302) may be failed.
Yes
Infrared
emitting LED is emitting light.
(LED200 - 204)
No
LED driver (Q202, Q203, Q205, Q206)
or LED bias (Q200, Q201) may be failed.
Yes
Signals
are received by the
infrared tuner.
No
Tone oscillation circuit (X300, M303, M304)
or AF mute circuit (M3) may be failed
• IR-300M
DC/DC converter's
output voltage is 5.0 V.
(C113 + terminal)
Reset terminal
of the CPU is maintained at H.
(TP105 and Pin No. 8 of
the M100)
Yes
Yes
Yes
Clock
(6 MHz) is oscillating.
(Pin No. 3 of the
M100)
No
DC/DC converter (M102) or power
switch (SW300) may be failed.
No
Reset circuit (M101) may be failed.
No
Clock oscillator (X100, M100) may
be failed.
Yes
VCO is oscillating.
(TP5)
No
VCO circuit (Q2) or buffer amplifier
(Q4) may be failed.
Yes
Transmitting
frequency is normal.
No
Clock oscillator (X100) or PLL
synthesizer (M4) may be failed.
Yes
RF output is normal.
(TP201, TP203, TP204)
No
RF amplifier (M200, M201, M202)
may be failed.
Audio frequency circuit
(M300, M302) may be failed.
Yes
Infrared
emitting LED is emitting light.
(LED200 - 205)
No
LED driver (Q202, Q205, Q206, Q207) or
LED bias (Q200, Q201) may be failed.
Yes
Signals
are received by the
infrared tuner.
No
Tone oscillation circuit (X300, M303, M304)
or AF mute circuit (M3) may be failed.
Microphone audio signals
not output.