Pioneer HTP-SB300 Service Manual page 19

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QQ
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A
TE
L 13942296513
Check audio output after COAXIAL
input.
Note: Input signal uses Dolby 5.1ch
source.
OK
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.
C
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B
Is the voltage of pin 14(R320)
(TAS5508 MUTE) of IC120
(TAS5508) High (3.3 V)?
OK
Check the output waveforms of
IC120(TAS5508)-pins 40,41,42,
43,51 and 52 (PWM Output).
OK
Check the output waveforms of IC122(TAS5342A)
-pins 39,36,33,28 and IC123(TAS5342A)-pins
39,36.
OK
Check the output waveform after
openig CP106 and CP107.
OK
Replace the Speaker Unit.
NG
Check the output waveform of
IC104(CS8422)-pin 1 (C104).
OK
Check the I2S output waveform of
IC104(CS8422)-pins 27(FB110),
28(FB109),29(FB108) and 31
(FB107).
OK
Check the waveforms of output
x ao u163
(FB117,FB118,FB119) of
y
IC105 (74LVC257).
i
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2 9
8
NG Is the voltage of pin 88(TAS_OTW)
of IC113 (MICOM) High (3.3 V)?
NG Check the waveform of X103
(13.5 MHz).
OK
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).
NG Replace the IC122 or IC123
(TAS5342A).
NG
Replace the L102,L103 and
L104.
Q Q
3 6 7 1 3 1 5
NG
Is the output voltage of IC101
(74AHCU04)-pin 14 (VCC33) +3.3 V?
Check the waveforms of IC101
(74AHCU04)-pin 13(Coaxial Input).
Replace the IC101(74AHCU04).
NG
Is the voltage of pin 32
(R106) (RESET) of IC104
(CS8422) High (3.3 V)?
OK
Check pin 58(R235) of IC113(MICOM)
is High.Replace it when it is Low.
Check the waveforms of
I2C communication port
of IC104(CS8422)-pins 9
(R109) and 10(R110).
OK
Replace the
IC104(CS8422).
NG
Is the voltage of pin 1(A/B) of
co
IC105 (74LVC257) Low (0 V)?
.
Replace the FB107,FB108,
FB109 and FB110.
HTP-SB300
7
9 4 2 8
After opening R376 of pin 2(OTW)
NG
of IC122, is the voltage of pin 88
(TAS_OTW) of IC113 (MICOM)
High (3.3 V)?
Replace the IC122(TAS5342A).
NG
Replace the X103 (13.5 MHz).
NG
Replace the IC120(TAS5508).
0 5 8 2 9 9 4 2 8
NG
Check the FB133.
OK
NG
Check the Coaxial Input
circuit.
OK
After opening R106, is the
NG
voltage of pin 32 of IC104
(CS8422) High (3.3 V)?
OK
Replace the
IC104(CS8422).
NG Check the waveforms of I2C
communication port of IC113
(MICOM)-pins 59(R236) and
60(R237).
OK
Replace the
Replace the
IC104(CS8422). IC113(MICOM).
m
NG
Check pin 70(R245) of IC113
(MICOM) is Low.
Replace it when it is High.
OK
8
9 9
A
OK
B
C
9 9
D
NG
E
NG
F
19
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