Pioneer SC-37 Service Manual page 35

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Step 2: MAIN Ucom (EMMA IC)
3 7 63 1515 0
Step 2-1: POWER SUPPLY for MAIN Ucom
CN9801 (Pins 1,2,3),
C9809,C9810
Is the
voltage of 5.6 V?
Yes
CN601 (Pin 14),IC9801 (Pin 13)
Is the
voltage of around
5 V?
Yes
Q9801 (Pins 2,4)
Q9802 (Pins 2,4)
Is the
voltage of around
5 V?
Yes
C9801 (+ side)
C9835 (+ side)
TE
L 13942296513
Is the
voltage of 3.3 V
or 1.8 V?
Yes

SC-37,SC-LX83
R9828,C9844,C9845

SC-35,SC-LX73
R9828,R9832,R9833,
R9836,R9837
Is the
voltage of 3.3 V
or 1.8 V?
Yes
R9860,R9871
Is the
voltage ?
Yes
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V+5R6_EV/V+5R6_DDD
No
Diagnose the PRIMARY Assy.
DVCPOW
No
Check the DVCPOW signal
between DIGITAL MAIN ASSY
and DISPLAY Assy.
No
Check the Q9801,Q9802 and its
peripheral circuits.
(f = 500 kHz)
No
Check the Q9801,Q9802 and its
peripheral circuits.
(C9801: 3.3 V)
(C9835: 1.8 V)
V+3R3_HHH,V+1R8_HHH,
V+1R8_DSP
No
Check the L9803,L9806 and its
peripheral circuits.
(R9828: 3.3 V)
(C9844,C9845,R9832,R9833,R9836,R9837: 1.8 V)
V+3R3_EM_D,V+3R3_EM_V
No
Replace R9860,R9871.
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IC9809 (Pins 1,4)
Is the
voltage of
3.3 V?
L9809
Is the
voltage of
2.5 V?
IC9810 (Pins 5,7)
Is the
voltage of 3.3 V
or 1.8 V?
IC9810 (Pin 1)
Q Q
3 6 7 1 3
Is the
voltage of around
To Step 2-2
Step 2-2: Xtal for MAIN Ucom
X101 (Pin 3)
Is there a
27 MHz output?
IC604 (Pin 19)
Is there a
36 MHz output?
To Step 2-3
u163
.
SC-37
6
7
2 9 9 4 2 8
V+3R3_HHH
No
Check the patterns between
IC9809 and R9828,R9829.
Yes
V+2R5_EM
No
Check the IC9809 and its
peripheral circuits.
Yes
V+3R3_HHH,V+1R8_HHH
No (Pin 5)
Check the patterns between
R9828 and IC9810.
(Pin 5: 3.3 V)
SC-37,SC-LX83
(Pin 7: 1.8 V)
Yes
Check the patterns between
IC9810 and C9844.
SC-35,SC-LX73
(Pin 7)
Check the patterns between
IC9810 and R9822,R9833.
V+1R05_EM
1 5 0 5 8 2 9 9 4
No
Check the IC9810 and its
peripheral circuits.
1 V?
Yes
CLK27EM
No Check the X101 and its
peripheral circuits.
(H: around 3.3 V)
(Check it with R147 too)
Yes
No
Check the X601,IC601 and its
peripheral circuits.
(H: around 3.3 V)
Yes
(Check it with R604 too)
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7
8
9 9
A
B
C
2 8 9 9
D
E
F
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