Sony Walkman WM-EX500, Service Manual

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6-4. IC PIN FUNCTION DESCRIPTION • IC Block Diagrams
IC301 TA2123AF (EL)
IC302 NJM2185AV-TE2
IC702 XC6371C251PL
PRE A PRE B
MIX
PW B
PW A PW C
BST
MT TC
BASE
RF IN
PW GND
OUT B
OUT C
OUT A
VCC
RF OUT
VREF OUT
BST NF BST OUT PW IN C LPF EQ A PW NF A PW IN A PW IN B PW NF B
3
IN A-R
5
PRE NF-A
6
PRE OUT A
7
MTL DRV A
8
MTL DRV B
9
PRE OUT B
10
PRE NF-B
11
AMS IN
12
IN B-R
4
IN B-F
2
IN A-F
1
21
20
19
18
17
GND 16
AMS DET 15
AMS MIX
14
AMS SW 13
22
23
24
38
C-AMP SW 37
PW SW 42
MT SW 41
F/R SW 44
BST SW
43
M/N SW 46
PRE GND 47
VREF IN 48
PRE SW 45
AMS OUT 40
BEEP 39
26 27 28 29 30 31 32 33 34
DET
36
AGC IN
35
+
–
+ –
+ – + –
+
–
+
–
EQ B
25
RIPPLE
FILTER
AGC
DET
BEEP
VREF
SWITCH
COMPARATOR
MTL DRV
8 9 10 14 13 12
2 1 3
A-CH BLOCK
11
7 6 5 4
G2 G1 V/I
WEIGHT
BIAS
CIRCUIT
+
–
+
–
GM
SUM
V+ SW VEXT OUT
A
DCA DET
A
INA
GND
IREF
VREF OUTB
DCB
DETB
INB
B-CH BLOCK: SAME AS A-CH.
V 1
PW 2
W 3
GND
4
OSC 5
DR 6
VREF 7
START 8
VSP
9
IN+ 10
PV
20
U 19
PU 18
GND 17
VCC 16
FC 15
TC1 14
TC2 13
R1 12
OUT 11
MOTIVE
CONTROL
CIRCUIT
MOTIVE/
OSC
MOTIVE
LOGIC
SOFT SWITCH
PRE DRIVER
INVERTER
BIAS
REFERENCE
VOLTAGE
SPEED
CONTROL
CURRENT
CONTROL
OUTPUT
BIAS
+
–
IC601 MM1279XVBE
1
2
3
5
4 CHIP ENABLE SLOW START
PHASE COMP
VLX LIMITER
PWM CONTROL
OSC 50/100/180kHz
+
–
NC
VOUT
CE
VDD
VSS
LX
VREF
BUFFER
ERROR
AMP
•
IC701 uPD789166GB-510-8ES (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Description
1 BATT DET I Battery voltage detection signal input (A/D input)
2 KEY IN I Key input terminal (A/D input)
3 F/R SW I Tape direction switch (S701) input terminal “L”: forward position
4 AMS IN I
Whether a music is present or not from TA2123AF (IC301) is detected at auto music sensor
“L”: music is present, “H”: music is not present
5 OSC IN I
Motor restart control signal input from the capstan/reel motor drive (IC601)
“H”: FF/REW motor rotation status
6 NC I Not used (open)
7
DOLBY KEY
CTL
I
Dolby is present or not control terminal
“L”: dolby is not present (WM-EX500), “H”: dolby is present (WM-EX505)
8 PHOTO IN I Rotation detect signal input of the capstan/reel motor (M901)
9 AVSS — Ground terminal (for A/D converter)
10 PHOTO CTL O
Control signal output to the capstan/reel motor rotation detect circuit
“L”: rotation detect circuit on
11 AMP CTL O
Also, this is used as control signal output for power on/off to the TA2123AF (IC301), or power
supply output for the dolby NR amp (IC302) “L”: power off, “H”: power on
IC302: Used for the WM-EX505 only
12 WAKE UP I
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function in
the power off status On at input of “H”
13 TAPE SW I Cassette tape detect switch (S901-1) input terminal “L”: cassette detected, “H”: no cassette
14 RMUM I Connection detect signal input of the remote commander
15 BEEP O Beep sound signal output to the TA2123AF (IC301)
16 F/R CTL O
Forward/reverse selection signal output to the TA2123AF (IC301)
“L”: forward direction, “H”: reverse direction
17 VDD1 — Power supply terminal (+2.5V)
18 AVLS CTL O
AVLS (Automatic Volume Limiter System) on/off control signal output terminal
“L”: AVLS off, “H”: AVLS on
19 GRV/MB CTL O
Emphasizing sound control signal output to the TA2123AF (IC301)
“L”: MB (mega bass), “H”: normal/GRV (groove)
20 BST CTL O Bass boost control signal output to the TA2123AF (IC301) “L”: off, “H”: on
21 LED DOLBY O
LED drive signal output of the
;
NR indicator (D704) “L”: LED on
Used for the WM-EX505 only
22 IC0 — Not used (fixed at “L”)
23 XT2 O Sub clock output terminal Not used (open)
24 XT1 I Sub clock input terminal Not used (fixed at “L”)
25 RESET I
System reset signal input from the reset signal generator (IC703)
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
26 X2 O System clock output terminal (4MHz)
27 X1 I System clock input terminal (4MHz)
28 VSS0 — Ground terminal
29 VDD0 — Power supply terminal (+2.5V)
30 R DATA OUT O Communication serial data output to the remote commander
31 LED BATT O LED drive signal output of the BATT indicator (D703) “H”: LED on
32 DOLBY CTL O
Dolby on/off control signal output to the dolby NR amp (IC302)
“L”: dolby NR on, “H”: dolby NR off Used for the WM-EX505 only
33 MOTOR CTL O
Motor start control signal output to the capstan/reel motor drive (IC601)
“L”: motor off, “H”: motor on