Sony Walkman MZ-R900 Manuale di servizio - Pagina 36

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Sony Walkman MZ-R900 Manuale di servizio
MZ-R900
IC801 CXD2671-202GA (SYSTEM CONTROLLER, DIGITAL SIGNAL PROCESSOR, 16M BIT D-RAM)
Pin No.
Pin Name
1
PAUSE KEY
2
MIC SENSE
3
XTEST
4, 5
NC
6
MCUVDD0
7
MIFVSS3
8
XRST
9
S MON
10
VB MON
11
CHG MON
12
VREF MON
SET KEY 1,
13, 14
SET KEY 2
15
VL MON
16
HIDC MON
17
WK DET
18
REC KEY
HALF LOCK
19
SW
20
RMC KEY
21
AVDD
22
AVSS
23
VDIOSC
24
OSCI
25
OSCO
26
VSIOSC
27
DAVDD
28
VREFL
29
AOUTL
30
AOUTR
31
VREFR
32
DAVSS
33
ASYO
34
ASYI
35
AVD1
36
BIAS
37
RFI
38
AVS1
39
PCO
40
PDO
41
FILI
42
FILO
43
CLTV
44
PEAK
45
BOTM
46
ABCD
34
I/O
I
Set key input terminal (X key input)
Control signal output to the microphone amp (IC303) "H": HIGH, "L": LOW,
O
normally: "H"
I
Input terminal for the test mode set up "L": test mode (normally fixed at "H")
O
Not used (open)
—
Power supply terminal (for microcomputer block) (+1.5V)
—
Ground terminal (for microcomputer I/F)
I
System reset signal input terminal from the power control (IC901) "L": reset
I
Servo signal monitor input terminal (A/D input) from RF amp (IC501)
I
Voltage monitor input terminal of UNREG power supply (A/D input)
I
Charge voltage monitor input terminal (A/D input) from XPC18A22FCR2 (IC601)
I
Clear reference voltage input terminal (A/D input) from RF amp (IC501)
I
Set key input terminal (A/D input)
I
VL voltage monitor input terminal (A/D input)
I
HIGH DC voltage monitor input terminal (A/D input)
I
Set key start switching detection signal input terminal (A/D input)
I
REC key input terminal (A/D input)
Open button detection switch (S805) input terminal (A/D input) "L": when normal position,
I
"H": when locked
I
Key input terminal (A/D input) of the remote commander attached headphone
—
Power supply terminal (for the analog circuit block) (+2.8V)
—
Ground terminal (for the analog circuit block)
—
Power supply terminal (for OSC cell) (+2.4V)
I
System clock (45.1584MHz) input terminal
O
System clock (45.1584MHz) output terminal
—
Ground terminal (for OSC cell)
—
Power supply terminal (for the built-in D/A converter) (+2.4V)
I
Reference voltage input terminal (for the internal D/A converter L-CH)
O
Built-in D/A converter (L-CH) output terminal Not used (open)
O
Built-in D/A converter (R-CH) output terminal Not used (open)
I
Reference voltage input terminal (for the built-in D/A converter R-CH)
—
Ground terminal (for the built-in D/A converter)
O
Playback EFM duplex signal output terminal
I
Playback EFM comparison slice level input terminal
—
Ground terminal (for the analog) (+2.4V)
I
Bias input for the playback EFM comparison
I
Playback EFM RF signal input from RF amp (IC501)
—
Ground terminal (for the analog)
O
Phase comparison output for the master clock of playback EFM system master PLL
O
Phase comparison output for the analog PLL Not used (open)
I
Filter input for the master clock of the playback EFM system master PLL
O
Filter output for the master clock of the playback EFM system master PLL
I
Internal VCO control voltage input for the playback EFM system master PLL
I
Peak hold signal input of the light amount signal (RF/ABCD) from RF amp (IC501)
I
Bottom hold signal input of the light amount signal (RF/ABCD) from RF amp (IC501)
I
Light amount signal (ABCD) input from RF amp (IC501)
Description