Kenwood DPC-MP727 Service Manual page 4

DPC-MP727/MP922
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3 7 63 1515 0
Port No. Port Name
67~69 P70~P72
70 3T
71 OFTR
72 P75
73 PUP1
74 PUP2
75 NMI
76 BLKCK
77 DOOR
78 LIMIT
79 WUP
80 HINT
81 PA5
82 RST
83 VDD
84~91 HD0~HD7
92 VSS
93 HCNTL0
94 HCNTL1
95 HR/W
96 HBIL
97 HCS
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L 13942296513
98 HAS
99 HDS
100 HRDY
2. Port Description of DSP IC (IC15)
Port No. Port Name
1 DVDD3V
2,3 D0,D1
4 NEW
5 NRAS
6,7 D2,D3
8,9 NCAS(0,1)
10~19 A8~A3
20 DVSS2
21 DVDD2
22 SPOUT
23 TRVM
24 TRVP
25 TRM
26 TRP
27 FOM
28 FOP
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29 FBAL
30 TBAL
31 VREF
32 FE .
33 TE
34 FRENV
35 OFT
4
CIRCUIT DESCRIPTION
I/O
- Unused.
I RF 3Tcompensation.
I Changeover the off track.
- Unused.
I Pull up port.
I Pull up port.
I Pull up port.
Sub code block clock signal input.
I
f BLKCK=75Hz(usual playback)
I Detection port of door switch.
I Detection port of limit switch.
I Return signal input from CPU (46pin).
I Signal input from DSP (IC3) to return the usual action.
- GND
I Reset signal input.
- +3.0v power supply.
I/O Data bus (0~7) input/output.
- GND
O Control command output for reading and writing.
O Control command output for reading and writing.
O Read write signal output.
O Interface setting port.
O CS signal output.
O Interface setting port.
O Interface setting port.
O Ready signal output.
I/O
- DRAM interface power supply.
I/O DRAM data input/output signal (D0,D1).
O DRAM writing enable signal.
O DRAM RAS control signal.
I/O DRAM data input/output signal (D2,D3).
O DRAM CAS control signal (0,1).
O DRAM address signal (A8~A3).
- Digital ground.
- Digital power supply.
O Spindle motor drive signal output.
O Traverse drive positive output.
O Traverse drive negative output.
O Tracking drive positive output.
O Tracking drive negative output.
O Focus drive positive output.
O Focus drive negative output.
O The balance adjustment for the focus error.
O The balance adjustment for the tracking error.
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y
I DA reference voltage input.
i I Focus error signal input.
I Tracking error signal input.
I RF envelope signal input.
I Off track signal input.
2 9
8
Function
Q Q
3 6 7 1 3 1 5
Function
co
.
9 4 2 8
ACTIVE
H L
0 5 8 2 9 9 4 2 8
ACTIVE
H L
m
Off Track
9 9
9 9