– 20 –
– 21 –
– 22 –
• IC Block Diagrams
IC301 TA2123AF (EL)
IC303 NJM2185AV-TE2
IC601 LB1994M-TLM
IC703 MM1305BWBE
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
262728293031323334
DET
36
AGC IN
35
+
–
+
–
+
–
+
–
+
–
+
–
EQ B
25
RIPPLE
FILTER
AGC
DET
BEEP
VREF
SWITCH
COMPARATOR
MTL DRV
891014 13 12
21 3
A-CH BLOCK
11
7654
G2
G1
V/I
WEIGHT
BIAS
CIRCUIT
+
–
+
–
GM
SUM
V+
SW
VEXT
OUTA
DCA
DETA
INA
GND
IREF
VREF
OUTB
DCB
DETB
INB
B-CH BLOCK: SAME AS A-CH.
DECODER
CTRL
BLOCK
POWER
D/DT PULSE
BUFFER
COMPARATORBUFFERVI
COMPARATOR
SOFT CLIP
CURRENT
AMP
P-SIG
PW•SW
4 5 61 2 97 8
14
15
16
17
18
19
20212224 23252627
30
29
28
36
35
34
33
32
31
WS MC
U IN
3
VCC
V IN
W IN
CTRL1
CTRL2
DIR
VS
US
U OUT
NC
V OUT
W OUT
WT
VT
UT
PGND
FC
CT2
CT1
IR
ICI2
ICI1
I SOFT
M CENTER
GND
VI2
VI1
IV
VC
13
PW
12
CI
11
Vref
10
P SIG
–
+
–
+
–
+
1
2
3
4
5
6
7
8
OUT2
OUT3
OUT4 GND
RIPPLE
CE
VCC
OUT1
–
+
6-4. IC PIN FUNCTION DESCRIPTION
• MAIN BOARD IC705 ML63514-024TBZ060 (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 CEN SW I Tape direction switch (S702) input terminal “L”: center position
4 RVS 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 remote commander, and connection detect signal input of
the remote commander
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), DC/DC
converter (IC701) and voltage detector (IC703) “L”: power off, “H”: power on
12 MUTE CTL O Power on mute control signal output to the TA2123AF (IC301) “L”: mute on
13 A/B SW I Detection signal input of side A or B “L”: side A, “H”: side B Not used
14
MODEL SELECT
I Model destination setting terminal Fixed at “H” in this set
15 BATT DET I Battery voltage detection signal input (A/D input)
16 KEY IN I Key input from the main unit or remote commander (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 idler gear 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 Normally: fixed at “H”
32 OSCM — Connected to capacitor for the oscillator 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 (S) IN I
Rotation detect signal input of the capstan/reel motor (M601)
It detects rotation of the idler gear (A) (side S)
38 PHOTO (T) IN I
Rotation detect signal input of the capstan/reel motor (M601)
It detects rotation of the idler gear (A) (side T)
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
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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