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© 2000-7 PRINTED IN JAPAN
B51-7638-00(S) 1889
SERVICE MANUAL
CD CASSETTE RECEIVER
GX-608EF2
POWER
TUNE/TRACK
REW
LOUD
FF
MUTE
SCN
DISP
T. I
NEWS
TONE/BAL
VOLUME
CD
BAND
CHR
TAPE
COMPACT
DIGITAL AUDIO
B NR
REP
RDM
PROG
RELEASE
AUTO-REVERSE
DOLBY B NR
AME
LOCAL
VOL ADJ
REG
Front glass assy
(B10-3165-13)
Panel assy
(A64-2014-22)
TEL
MUTE
A19
SUBARU GENUINE
Sub panel assy
(A22-2807-13)
Cassette lid
(A53-1679-03)
Cord with plug (ANT)
(E30-4809-15)
Cord with connector
(Tel mute)
(E30-4810-05)


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GX-608EF2
2
BLOCK DIAGRAM
L12
FM:223mV
AM:180mV
FM
AM
TAPE:345mV
CD:1200mV
CH:1200mV
0dB
0dB
0dB
AM:
FM:
TAPE:
CD:
CH:
-6.0dB
-9.0dB
-12.0dB
0.0dB
0.0dB
315Hz 0dB
1kHz 40kHzdev.
400Hz 30%mod.
1kHz 0dB
1kHz 0dB
F/E
ANT
SW AMP
IC21
FM
AM
EQ-DOLBY
CD-MECHA
CD-CH
IC22
E-VOL
-12dB
-12dB
IC31,32
FIX EQ
+34dB
+34dB
IC41
REAR
SP
SP
FRONT
MPX
AN7550NZ
NJM2060M
ATT
ATT
TDA7400D
BA3129F
0dB
CASSETTE
MECHA
ANT
F/E
IF/NC
PLL
FM+B
AM+B
A11
Q101
Q103
RDS
NOISE AMP
IC12
IC13
LOUD
BASS
TREBLE
ATT
FADER
ISO-AMP
SELECTOR
MPX
IC22
E-VOL
SW AMP
EQ,DOLBY
IC21
IC1
(D40-1079-05)
MECHA
(X92-3590-01)
CD MECHA
CASSETTE
FIX-EQ
IC31,32
IC81
EEPROM
IC84
CHANGER
SYSTEM u-COM
DRIVER
MOTOR
POWER IC
IC41
SP-OUT
MUTE Dr
IC83
Q709
BU DET.
Q904
ACC DET.
ACC
P-ANT
ANT-CON
Q94
PANEL u-COM
IC1
VFD
KEY MATRIX
LAMP
(X25)
TDF
RST
RST
IC92
MECHA
Q701
AVR
A8V
AVR
Q704
AVR
VREF
IC72
BU5V
AVR
Q706
BACK UP
Q708
PON5V
SW
LAMP
A61
Q605,606
SMALL IN
TEL MUTE
DC/DC
Level difference of each sauce


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GX-608EF2
3
qSYNTHESIZER UNIT(X14-6212-70)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
HA12216FP
Dolby B
Playback EQ, Dolby B, blank space detection
IC2
BA6219BFP-Y
Motor driver
For cassette mechanism
IC12
NJM4565M-TE2
Operational amplifier
For RDS noise amplifier
IC13
TDA7479D
RDS decoder
For RDS decoding
IC21
BA3129F
SW operational amplifier
For CD/TAPE switching
IC22
TDA7400D
Electronic control
BASS, TRE, MPX, EVOL
IC31,32 NJM2060M
Operational amplifier
For FIX-EQ
IC41
AN7550NZ
Power amplifier
4-channel 35W power amplifier
IC71
M5237ML
AVR control
For AUDIO +8V power supply
IC72
NJM4580MD
Operational amplifier
1/2 VCC output
IC81
UPD784216GF526
System microprocessor
System control
IC82
PST9130NR
Reset IC
Reset detection
IC83
TC74HC02AF
NOR circuit (4)
For hard muting
IC84
BR24C01AF
EEP-ROM
For memory backup
Q1
2SB1443
Cassette mechanism main motor power switch
For cassette mechanism main motor
Q2
DTC114EK
Cassette mechanism main motor power switch
Pch-SW
Q3
DTC144EK
Gain switching during tape searching
Pch-SW, on during tape playback
Q4
DTA144EK
Gain switching during tape searching
Nch-SW, on during tape playback
Q5
DTC144EK
Motor driver power switch
Pch-SW
Q6
DTA114EK
Motor driver power switch
Nch-SW
Q7
2SB1443
Motor driver power supply
For cassette mechanism submotor driver
Q8
2SC2412K(S)
Motor driver power supply control
For cassette mechanism submotor driver
Q9
DTC144EK
Kick switch
On for emergency eject when submotor locked
Q101
2SB1188(Q,R)
FM power switch
For FM 8V
Q102
DTC124EK
FM power switch
Pch-SW
Q103
2SB1188(Q,R)
AM power switch
For AM 8V
Q104
DTC124EK
AM power switch
Pch-SW
Q107
DTC124EK
IF mode forced switching switch
Lo output at WIDE
Q108
2SC2412K(S)
Noise amplifier
Noise detection output buffer
Q109
DTC114TK
Noise amplifier
Constant switching when noise detected
Q110
DTA124EK
Noise amplifier
Constant switching when noise detected
Q201
DTC114EK
Source switch switching
Lo output at TAPE
Q202
2SA1037K
Mute switch
For CD muting
Q203
DTC144EK
Mute switch
For IC II 3 hard muting
Q204
DTC343TK
Mute switch
For CD muting, Rch
Q205
DTC343TK
Mute switch
For CD muting, Lch
Q601
DTC124EK
DC/DC AVR switch
Pch-SW
Q602
DTA124EK
DC/DC AVR switch
Nch-SW
Q603
2SB1184
DC/DC AVR
For 13V AR
Q604
2SC2412K(S)
DC/DC AVR control
For 13V AR
Q605
2SB1565(E,F)
Lamp AVR
For 10V AR
Q606
2SB1565(E,F)
Lamp AVR
For 10V AR
Q607
DTA124EK
Lamp AVR switch
Nch-SW
Q608
2SC2412K(S)
Lamp AVR control
For 10V AR
Q609
DTC144EK
Small detection
Lo output at small ON
COMPONENT DESCRIPTION


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GX-608EF2
4
qSWITCH UNIT(X25-8502-70)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
UPD78011FGC599
Display control microprocessor
VFD control, key take in
Q1
DTC114EK
5V control
Nch-SW
Q2
DTA114YK
VFD power switch
Pch-SW
Q3
DTC114YK
5V control
VFD protection SW
Q4
DTC114EK
VFD control
VFD control
COMPONENT DESCRIPTION
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
Q610
DTC114EK
Lamp AVR switch
P-CH-SW
Q701
2SB1565(E,F)
CD mechanism AVR
For 7.5V AVR
Q702
2SC2412K(S)
CD mechanism AVR control
For 7.5V AVR
Q703
DTA124EK
CD mechanism AVR switch
For 7.5V AVR
Q704
2SB1565(E,F)
AVR
For 8V AVR
Q705
DTA124EK
AVR switch
For 8V AVR
Q706
2SB1565(E,F)
Microprocessor AVR
For 5.6V AVR
Q707
2SC2412K(S)
Microprocessor AVR control
For 5.6V AVR
Q708
2SA1037K
P-ON 5V switch
P-ON 5V SW
Q709
2SC2412K(S)
BU detection
Lo output at BU ON
Q802
DTA114EK
DSI control
Hi output when DSI lit
Q803
DTC144EK
AVR control switch
On when P-ON 5V on
Q901
2SA1037K
P-ANT circuit protection
Antenna short-circuiting protection
Q902
DTA124EK
P-ANT circuit protection
Antenna short-circuiting protection
Q903
DTC144EK
P-ANT circuit control switch
P-ANT circuit control
Q94
2SB1443
P-ANT circuit control switch
P-ANT circuit control
Q904
2SC2412K(S)
ACC detection
Lo output at ACC ON


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GX-608EF2
5
SYSTEM MICROCOMPUTER : UPD784216GF526 (IC81 : X14-6212-70)
qTerminal Description
Pin
Function
I/O
Description
1
AM+B
O AM power output
2
FM+B
O FM power output
3
P_MUTE
O Power IC mute
4
P_STBY
O Power IC standby
5
CD_SW3
I
CD mechanism SW3
6
CD_MOTOR
O CD mechanism loading motor
7
CD_LO/EJ
I/O CD mechanism load/eject control
8
CD_MSTOP
O CD mechanism mechanism stop
9
VDD
-
10-23 CD_MRST
O CD mechanism mechanism reset
11
CD_MUTE_L
I
Mute request from CD mechanism
(Lch)
12
BEEP
O Beep output
13
CD_MDET
I
CD mechanism detection
14
CD_DATA_P I/O CD mechanism data line
15
CD_CLK
O CD mechanism clock line
16
NC
-
17
CD_MUTE_R I
Mute request from CD mechanism
(Rch)
18
NC
-
19
NC
-
20
REF_CONT
O A/D reference voltage control
21
CH_REQH
I
Communications request from
CDCH CH
22
TEST
-
23
TYPE1
I
Tuner setting 1
24
TYPE2
I
Tuner setting 2
25
CD_SW1
I
CD mechanism SW1
26
CD_SW2
I
CD mechanism SW2
27
MUTE
O Audio mute
28
P_ON
O Peripheral power control
29
CH_ON
O CDCH control output
30
CH_RST
O CDCH reset
31
CH_MUTE
I
CDCH mute
32
ANT_CON
O Antenna control
33
DC/DC
O DC/DC
34
PACK_DET
I
Cassette mechanism back detection
35
CS_STBY
I
Cassette mechanism standby
position detection
36
M_MOTOR
O Cassette mechanism main motor
control
37
VDD
-
38
X2
-
39
X1
-
40
VSS
-
41
XT2
-
42
XT1
-
43
RESET
I
44
BU_DET
I
BU detection
45
CD_SREQ
I
CD mechanism SIO
communications request
46
ACC_DET
I
ACC detection
47
ILLM_OUT
O Illumination control
48
CH_REQC
O Communications request from
CDCH CH
49
SC_REQ
I
Communications request from panel
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin
Function
I/O
Description
50
R_CLK
I
RDS CLK
51
AVDD
-
52
AVREFO
-
53
SMALL
I
SMAALL input
54
PHONE
I
Telephone detection
55
REEL_S
I
Cassette mechanism reel pulse input
56
REEL_T
I
Cassette mechanism reel pulse input
57
NC
-
58
NOISE
I
Noise level
59
SMETER
I
S-meter level
60
MODE
I
Cassette mechanism mechanism
position mode pulse input
61
AVSS
-
62
SC_CON
O Panel control output
63
SC_BUSY
I
Panel busy input
64
AVREF1
-
65
CH_DATAC
I
CDCH SIO input
66
CH_DATAH
O CDCH SIO output
67
CH_CLK
O CDCH SIO CLK
68
SC_DATA
I
CDCH SIO input
69
MC_DATA
O CDCH SIO output
70
MC_CLK
O CDCH SIO CLK
71
MC_REQ
O Communications request to panel
72
NC
-
73
PLL_CE
O PLL SIO CE
74
PLL_DATA
O PLL SIO output
75
PLL_CLK
O PLL S10 CLK
76
DSI
O Security LED control
77
TDF
I
Panel detach detection
78
SUB_P
O Cassette mechanism submotor control
79
SUB_M
O Cassette mechanism submotor control
80
KICK
O Cassette mechanism kick control
81
R_DATA
I
RDS data
82
QUAL
I
RDS quality
83
PACK_IN
I
Cassette mechanism tape insertion
detection
84
MUSIC
O Cassette mechanism blank space
detection
85
MSGV
O Gain switching during tape search on
Cassette mechanism
86
F/R
O Cassette mechanism F/R switching
87
METAL
I
Cassette mechanism metal detection
88
DOLBY
O Cassette mechanism Dolby switching
89
EQ_MUTE
O Cassette mechanism EQ mute
90
NC
-
91
NC
-
92
AFC
I
AFC
93
IF_MODE
O K21 IF status detection
94
WIDE
O K21 control wide
95
NARROW
O 21 control narrow
96
FM_SD
I
SD
97
SDA_IC2
I/O IC2 SDA
98
SCK_IC2
O IC2 SCK
99
A_SEL
O Audio select
100 VSS
-