19
HTP-SB300
5
6
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B
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F
Is the voltage of pin 88(TAS_OTW)
of IC113 (MICOM) High (3.3 V)?
Is the voltage of pin 14(R320)
(TAS5508 MUTE) of IC120
(TAS5508) High (3.3 V)?
NG
After opening R376 of pin 2(OTW)
of IC122, is the voltage of pin 88
(TAS_OTW) of IC113 (MICOM)
High (3.3 V)?
NG
Replace the IC122(TAS5342A).
OK
OK
Check the output waveform of
IC104(CS8422)-pin 1 (C104).
NG
Is the output voltage of IC101
(74AHCU04)-pin 14 (VCC33) +3.3 V?
NG
Check the FB133.
NG
OK
OK
OK
Check audio output after COAXIAL
input.
Note: Input signal uses Dolby 5.1ch
source.
Replace the
IC104(CS8422).
OK
OK
Check pin 58(R235) of IC113(MICOM)
is High.Replace it when it is Low.
NG
NG
OK
OK
Check the waveform of X103
(13.5 MHz).
Replace the X103 (13.5 MHz).
Check the output waveforms of
IC120(TAS5508)-pins 40,41,42,
43,51 and 52 (PWM Output).
NG
Replace the IC122 or IC123
(TAS5342A).
Check the output waveforms of IC122(TAS5342A)
-pins 39,36,33,28 and IC123(TAS5342A)-pins
39,36.
NG
NG
After opening R338,R339,R340,
R341,R342 and R343 of IC120
(TAS5508)-pins 40,41,42,43,
51 and 52, check the waveform.
OK
Replace the IC122 or IC123
(TAS5342A).
Replace the IC120(TAS5508).
NG
OK
Replace the L102,L103 and
L104.
Check the I2S output waveform of
IC104(CS8422)-pins 27(FB110),
28(FB109),29(FB108) and 31
(FB107).
Is the voltage of pin 32
(R106) (RESET) of IC104
(CS8422) High (3.3 V)?
NG
After opening R106, is the
voltage of pin 32 of IC104
(CS8422) High (3.3 V)?
Replace the
IC113(MICOM).
OK
OK
Replace the
IC104(CS8422).
Replace the
IC104(CS8422).
NG
NG
Check the waveforms of
I2C communication port
of IC104(CS8422)-pins 9
(R109) and 10(R110).
Check the waveforms of I2C
communication port of IC113
(MICOM)-pins 59(R236) and
60(R237).
OK
Check the waveforms of IC101
(74AHCU04)-pin 13(Coaxial Input).
Check the Coaxial Input
circuit.
NG
OK
Replace the IC101(74AHCU04).
Check the waveforms of output
(FB117,FB118,FB119) of
IC105 (74LVC257).
Is the voltage of pin 1(A/B) of
IC105 (74LVC257) Low (0 V)?
NG
Check pin 70(R245) of IC113
(MICOM) is Low.
Replace it when it is High.
NG
OK
Replace the FB107,FB108,
FB109 and FB110.
Check the output waveform after
openig CP106 and CP107.
Replace the Speaker Unit.
NG
OK
B
A
C
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TEL 13942296513 QQ 376315150 892498299
