Pioneer SC-37 Service Manual page 39

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Step 1-3: Xtal for DSP
3 7 63 1515 0
X9001 (Pin 3)
Is there a
24 MHz output?
Yes
voltage of around
IC9011 (Pins 2,5)
Are there
signals?
Yes
IC9011 (Pins 3,6)
Are there
signals?
Yes
TE
L 13942296513
IC9003 (Pin 80)
IC9202 (Pin 17)
Are there
signals?
Yes
SC-LX83,SC-LX73
X1801 (Pins 1,3)
Is there a
45 MHz output?
Yes
To Step 1-4
Step 1-4: Reset for DSP
IC9304 (Pin 12)
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Is the
voltage of around
3.3 V?
Yes
.
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No
X9001 (Pin 1)
(H: around 4 Vp-p)
Is the
No
Check the X9001
and its peripheral
3.3 V?
circuits.
Yes
Replace X9001.
No
Check the patterns between
IC9011 (Pins 2,5) and X9001.
No
Check the IC9011 and its
peripheral circuits.
DSP2CLKIN
No
Check the patterns between
IC9003 (Pin 80),IC9202
(Pin 17) and IC9011 (Pins 2,5).
No
Check the X1801 and its
peripheral circuits.
(H: around 1.4 Vp-p)
SC-37,SC-35 only
XDIRRST
No
Check the IC9304 and its
peripheral circuits.
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y
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6
8
IC9301 (Pin 26)
voltage of around
3.3 V?
IC9304 (Pin 13)
voltage of around
3.3 V?
IC9003 (Pin 111)
voltage of around
3.3 V?
IC604 (Pin 63)
voltage of around
3.3 V?
Q Q
IC9202 (Pin 14)
3 6 7 1 3
voltage of around
3.3 V?
To Step 1-6
(SC-35,SC-LX73)
Step 1-5: HMG BLOCK
IC604 (Pin 54)
voltage of around
3.3 V?
IC9503 (Pin 190)
voltage of around
3.3 V?
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To Step 1-6
.
SC-37
6
7
2 9 9 4 2 8
XDIRRST
Is the
No
Check the patterns between
IC9304 (Pin 12) and
CN9301 (Pin 26).
Yes
XDSP1RST
Is the
No
Check the IC9304 and its
peripheral circuits.
Yes
XDSP1RST
Is the
No
Check the patterns between
IC9304 (Pin 13) and
IC9003 (Pin 111) (Include R9049).
Yes
XDSP2RST
Is the
No
Replace IC604.
Yes
XDSP2RST
1 5 0 5 8 2 9 9 4
Is the
No
Check the patterns between
IC604 (Pin 63) and IC9202 (Pin 14)
(Include R9230).
Yes
To Step 1-5
(SC-37,SC-LX83)
XNETRST
Is the
No
Replace IC604.
Yes
XNETRST
Is the
No Check the patterns between
IC604 (Pin 54) and IC9503
m
(Pin 190) (Include R9536).
Yes
co
7
8
9 9
A
B
C
2 8 9 9
D
E
SC-37,SC-LX83 only
F
39
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