Is there any abnormality below?
DAMP PCB [Analog audio signal]
WF70 : L+/L-
WF71 : R+/R-
Is there any abnormality below?
MAIN PCB [Analog audio signal]
JK20 :1pin, 2pin
JK21 : 1pin, 2pin
Check for abnormalities in the parts around [L708,
L709], etc. and repair them.
Replace the [JK20, JK21].
4. No sound is output from the speakers or headphones, or noise
occurs
Is there any abnormality below?
MAIN PCB [DIR1]
IC37 : 22pin,36pin, 42pin(+3.3VD), 46pin(+5VD)
MAIN PCB DIR1
Is [IC37 : 34pin(RST)] "Hi"?
Is there any abnormality below?
MAIN PCB [DIR1 digital audio signal (I2S)]
IC37 : 17pin(DIR1M_SDATAO)
18pin(DIR1M_LRCKO)
19pin(DIR1M_SCLKO)
20pin(DIR1M_MLCKO)
Is there any abnormality below?
MAIN PCB PWM Modulator TAS 5558
IC40 : 9pin, 14pin, 35pin, 35pin,
50pin(+3.3V_5558)]
Is there any abnormality below?
MAIN PCB PWM Modulator TAS 5558
[Digital audio signal (I2S)]
IC40 : 11pin(MCLK), 22pin(LRCK), 23pin(SCLK),
19pin(SDIN1)
MAIN PCB PWM Modulator TAS 5558
Is [IC40 : 16pin(RESET)] "Hi"?
[IC24 : +3.3VD], [Q222 : +5VD] or SMPS power
supply circuit may be malfunctioning.
Repair the part where the abnormality is occur-
ring or check each part according to the area from
"YES" in the ow chart for "1.3. Power Supply Volt-
age Abnormalities".
The DIR1 [IC37], MCU [IC20] or the circuit around
the MCU may be malfunctioning.
Check for abnormalities and repair them.
There may be issues in the circuit around [IC37] or
in the operation of the operation check function.
If there is an abnormality in the operation check
function, check the functions in items 6-9.
The PWM modulator [IC40], +3.3V_5558MCU
[IC20] or the circuit around the MCU may be mal-
functioning.
Check for abnormalities and repair them.
The PWM modulator [IC40], MCU [IC20] or the
circuit around the MCU may be malfunctioning.
Check for abnormalities and repair them.
NO
NO
NO
NO
YES
YES
YES
YES
Check for abnormalities in the signal path be-
tween MAIN PCB DIR1[IC37] and MAIN PCB PWM
modulator TAS5558[IC40], and repair them.
NO
Speaker → "4.1. No sound is output from the
speakers, or noise occurs"
Headphone → "4.2. No sound is output from the
headphones, or noise occurs"
YES
NG
NO
4.1. No sound is output from the speakers, or noise occurs
Is there any abnormality below?
MAIN PCB PWM Modulator TAS 5558
[PWM signal]
IC40 : 38pin(PWM_M_1), 39pin(PWM_P_1),
40pin(PWM_M_2), 41pin(PWM_P_2)
Is there any abnormality below?
DAMP PCB [DAMP TAS5142]
IC70 : 1pin, 18pin, 19pin, 36pin(+12V_5142),
21pin, 26pin, 29pin, 34pin(AMP_
VCC(+29V))
[WF72, PF72 : 6pin] or SMPS power supply circuit
may be malfunctioning.
Repair the part where the abnormality is occur-
ring or check each part according to the area from
"YES" in the ow chart for "1.3. Power Supply Volt-
age Abnormalities".
The MAIN PCB [Q221, Q223] or SMPS power sup-
ply circuit may be malfunctioning. Check each part
listed after "YES" in "1.3. Power Supply Voltage
Abnormalities".
NO
YES
NO
YES
Is there any abnormality below?
DAMP PCB [PWM signal of DAMP TAS 5142]
IC70 : 4pin(PWM_A), 6pin(PWM_B),
14pin(PWM_C), 16pin(PWM_D)
Check for abnormalities in the signal path be-
tween MAIN PCB PWM modulator TAS5558[IC40]
and DAMPTAS5142[IC70], and repair them.
NO
YES
Is there any abnormality below?
DAMP PCB [PWM signal of DAMP TAS 5142]
IC70 : 22pin(OUT_D), 25pin(OUT_C),
30pin(OUT_B), 33pin(OUT_A)
There is an abnormality in the communica-
tion between DAMP PCB DAMPTAS5142[IC70],
TAS5142[IC70]] and TAS5558[IC40], or in the
surrounding circuits.
Check for abnormalities and repair them or
replace DAMP PCB.
NO
YES
NO
YES
YES
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
50
To Next Page
Loading...
Need help?
General
