Pioneer SC-37 Service Manual page 52

1
QQ
Step 1-3: Power Supply XM 3 7 63 1515 0
IC1816 (Pin 1)
A
Is the
No
voltage of around
5.6 V?
Yes
IC1816 (Pin 3)
Is the
No
voltage of around
4.5 V?
B
Yes
IC1816 (Pin 5),L1802
Is the
No
voltage of around
3.3 V?
Yes
To Step 2-1
C
Step 2: Xtal
Step 2-1: VIDEO BLOCK
TE IC904 (Pins 4,5)
L 13942296513
No
Is there a
27 MHz output?
(H: around 1.5 Vp-p)
Yes
X1101 (Pins 1,3)
D
No
Is there a
28 MHz output?
(H: around 1 Vp-p)
Yes
X1201 (Pins 1,3)
No
Is there a
20 MHz output?
E
(H: around 1.8 Vp-p)
Yes
To Step 3-1
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F
52
1
http://www.xiaoyu163.com
2
V+5R6_DDD
Diagnose the PRIMARY Assy.
RYAC
Diagnose the PRIMARY Assy.
Replace IC1816.
SC-37,SC-35 only
Check the X901 and its
peripheral circuits.
Check the X1101 and its
peripheral circuits.
Check the X1201 and its
peripheral circuits.
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2
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3
Step 3: Reset
8
Step 3-1: VIDEO BLOCK
IC604 (Pin 76)
Is the
voltage of around
3.3 V?
Yes
IC904 (Pin 21)
Is the
voltage of around
3.3 V?
Yes
voltage of around
IC604 (Pin 82)
Is the
voltage of around
3.3 V?
Yes
R1226
Is the
Q Q
voltage of around
3 6 7 1 3
3.3 V?
(Check it with the series resistance immediate
Yes before the through-hole because this product is
IC1204BGA package.)
IC604 (Pin 80)
Is the
voltage of around
3.3 V?
Yes
IC1602 (Pin 25)
Is the
voltage of around
3.3 V?
Yes
IC604 (Pin 81)
Is the
voltage of around
3.3 V?
Yes
IC1603 (Pin 25)
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G
.
SC-37
3
4
2 9 9 4 2 8
XHDRXRST
No
Replace IC604.
XHDRXRST
No
R720
Is the
No
Replace IC604.
3.3 V?
XVSRST
No
Replace IC604.
XVSRST
No
1 5 Replace R1226. 0 5 8 2 9 9 4
XHDTX1RST
No
Replace IC604.
XHDTX1RST
No
Check the patterns between
IC604 (Pin 80) and IC1602 (Pin 25)
(Include R711,R1648).
XHDTX2RST
No
Replace IC604.
XHDTX2RST
m
co
4
9 9
2 8 9 9