6-4. Ic Pin Function Description - Sony Walkman WM-EX500 Service Manual

• IC Block Diagrams
IC301 TA2123AF (EL)
36 35 34 33 32 31 30 29 28 27 26 25
BST
AGC
–
DET
+
–
+
PW B
C-AMP SW 37
MT TC 38 PW A
PW C +
–
BEEP 39 BEEP
AMS OUT 40
RIPPLE
FILTER
MT SW 41
PW SW 42
SWITCH
BST SW 43 COMPARATOR
F/R SW 44
PRE SW 45
PRE A PRE B
M/N SW 46
MIX
PRE GND 47
VREF IN 48
VREF
MTL DRV
1 8
2 3 4 5 6 7 9 10 11 12
IC302 NJM2185AV-TE2
IC601 MM1279XVBE
14 13 12 11 10 9 8
1
V
G2 G1 V/I
+
BIAS
–
CIRCUIT
SUM PW 2
WEIGHT
W 3
–
GND 4
+
GM
A-CH BLOCK
MOTIVE/
OSC 5
OSC
B-CH BLOCK: SAME AS A-CH.
DR
6
7 BIAS
VREF
1 2 3 4 5 6 7
REFERENCE
START 8
VOLTAGE
INVERTER
VSP 9
IN+ 10
– 20 –
IC702 XC6371C251PL
NC 1
ERROR
AMP
–
+
VOUT 2
PHASE COMP
VDD VREF
24 RF IN
CE 3 CHIP ENABLE SLOW START
23 PW GND
22 OUT B
21 OUT C
20 OUT A
19 VCC
18 BASE
17 RF OUT
16 GND
15 AMS DET
14 AMS MIX
13 AMS SW
20 PV
19 U
PRE DRIVER
MOTIVE
CONTROL
CIRCUIT
18 PU
17 GND
VCC
16
15 FC
MOTIVE
SOFT SWITCH
LOGIC
14 TC1
13 TC2
SPEED CURRENT
CONTROL CONTROL
12 R1
OUTPUT
BIAS 11
OUT
–
+
5 VSS
PWM CONTROL
OSC 50/100/180kHz
BUFFER
VLX LIMITER 4 LX
– 21 –

6-4. IC PIN FUNCTION DESCRIPTION

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
Whether a music is present or not from TA2123AF (IC301) is detected at auto music sensor
4 AMS IN I
"L": music is present, "H": music is not present
Motor restart control signal input from the capstan/reel motor drive (IC601)
5 OSC IN I
"H": FF/REW motor rotation status
6 NC I Not used (open)
DOLBY KEY Dolby is present or not control terminal
7 I
CTL "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)
Control signal output to the capstan/reel motor rotation detect circuit
10 PHOTO CTL O
"L": rotation detect circuit on
Also, this is used as control signal output for power on/off to the TA2123AF (IC301), or power
11 AMP CTL O supply output for the dolby NR amp (IC302) "L": power off, "H": power on
IC302: Used for the WM-EX505 only
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function in
12 WAKE UP I
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)
Forward/reverse selection signal output to the TA2123AF (IC301)
16 F/R CTL O
"L": forward direction, "H": reverse direction
17 VDD1 — Power supply terminal (+2.5V)
AVLS (Automatic Volume Limiter System) on/off control signal output terminal
18 AVLS CTL O
"L": AVLS off, "H": AVLS on
Emphasizing sound control signal output to the TA2123AF (IC301)
19 GRV/MB CTL O
"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
LED drive signal output of the ; NR indicator (D704) "L": LED on
21 LED DOLBY O
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")
System reset signal input from the reset signal generator (IC703)
RESET I
25
"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
Dolby on/off control signal output to the dolby NR amp (IC302)
32 DOLBY CTL O
"L": dolby NR on, "H": dolby NR off Used for the WM-EX505 only
Motor start control signal output to the capstan/reel motor drive (IC601)
33 MOTOR CTL O
"L": motor off, "H": motor on
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