Sony Walkman WM-EX921, Service Manual

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WM-EX921
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6-7. IC PIN FUNCTION DESCRIPTION
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IC705 ML63514-025TBZ060 (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Description
1 AUDIO ATT O Audio attenuate control signal output It attenuates, when cue/review “H”: attenuate
2 FWD SW I Tape direction switch (S702) input terminal “L”: forward position
3 CENTER SW I Tape direction switch (S702) input terminal “L”: center position
4 REV SW I Tape direction switch (S702) input terminal “L”: reverse position
5 CASSETTE SW I Cassette tape detect switch (S704-1) input terminal “L”: cassette detected, “H”: no cassette
6 DATA/RMUM I/O
Communication serial data output to the headphone with remote control, and connection detect
signal input of the remote control
7 REVIVE CTL O
Emphasizing sound control signal output to the TA2123AF (IC301)
“L”: normal/mega bass/groove, “H”: revive
8
MEGA BASS
CTL
O
Emphasizing sound control signal output to the TA2123AF (IC301)
“L”: normal/groove, “H”: mega bass/revive
9 F/R CTL O
Forward/reverse selection signal output to the TA2123AF (IC301)
“L”: forward direction, “H”: reverse direction
10 BOOST CTL O Bass boost control signal output to the TA2123AF (IC301) “L”: off, “H”: on
11 AMP CTL O
Also, this is used as control signal output for power on/off to the TA2123AF (IC301) and DC/DC
converter (IC701) “H”: power on
12 MUTE CTL O Audio mute control signal output to the TA2123AF (IC301) “L”: mute on
13 SET STOP 1 I Voltage input terminal for set stop
14 SET STOP 2 I Reference voltage input terminal for set stop
15 BATT DET I Battery voltage detection signal input (A/D input)
16 KEY IN I Key input from the main unit or headphone with remote control (A/D input)
17 PM CTL O Plunger drive signal output terminal “L”: plunger on
18 SPEED CTL O
Motor speed control signal output to the capstan/reel motor driver IC (IC601)
“L”: normal speed, “H”: 1/2 speed
19 PHOTO CTL O
Control signal output to the capstan/reel motor rotation detect circuit
“L”: rotation detect circuit on
20 DOLBY CTL O Power on/off control signal output to the Dolby NR circuit “L”: Dolby NR on
21 VDD1 — Power supply terminal (+2.5V) (for external interface)
22 VSS — Ground terminal
23 VDD — Power supply terminal (+1.5V)
24 VDDH — Power supply terminal (+2.5V) (for back-up boost)
25, 26 CB1, CB2 — Connected to capacitor for the boost power supply
27 VDDL — Power supply terminal (for internal logic)
28 XT0 I Main system clock input terminal (32.768kHz MHz)
29 XT1 O Main system clock output terminal (32.768kHz MHz)
30, 31 TST1B, TEST2B I Test input terminal Fixed at “H” in this set
32 NC — Not used (open)
33 OSC0
I
Connected to resistor for the high speed CR oscillator (550 kHz)
34 OSC1 O Connected to resistor for the high speed CR oscillator (550 kHz)
35 RESET I
System reset signal input from the reset signal generator (IC704)
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
36 BEEP O Beep sound signal output to the TA2123AF (IC301)
37 PHOTO IN (S) I
Rotation detect signal input of the capstan/reel motor (M601)
It detects rotation of the idler gear (A) (side S)
38 NC O Not used (open)
39 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
Pin No. Pin Name I/O Description
40 P-SIG I P-SIG signal input from the capstan/reel motor driver IC (IC601)
41 MOTOR START O
Motor restart control signal output to the capstan/reel motor driver IC (IC601)
“L”: restart the motor
42 MOTOR DIR O
Motor direction control signal output to the capstan/reel motor driver IC (IC601)
“L”: clockwise, “H”: counterclockwise
43, 44 CTRL 1, CTRL 2 O Mode selection signal output to the capstan/reel motor driver IC (IC601) (W phase)
45 MOTOR W O Motor control signal output to the capstan/reel motor driver IC (IC601) (W phase)
46 MOTOR V O Motor control signal output to the capstan/reel motor driver IC (IC601) (V phase)
47 MOTOR U O Motor control signal output to the capstan/reel motor driver IC (IC601) (U phase)
48 NC O Not used (open)