Sony XR-C6120 User manual

MICROFILM
SERVICE MANUAL
FM/AM CASSETTE CAR STEREO
US Model
Canadian Model
Model Name Using Similar Mechanism XR-C5100
Tape Transport Mechanism Type MG-25F-136
SPECIFICATIONS
XR-C6120
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol aare trade-
marks of Dolby Laboratories Licensing Corporation.

XR-C6120
– 19 – – 20 –
6-3. SCHEMATIC DIAGRAM – MAIN Board (1/2) – • See page 29 forWaveforms. •See page 27 for IC Block Diagrams.

XR-C6120
– 21 – – 22 –
6-4. SCHEMATIC DIAGRAM – MAIN Board (2/2) – • See page 28 for IC Block Diagrams.
(Page 25)

XR-C6120
6-6. SCHEMATIC DIAGRAM – KEY Board – • See page 29 forWaveform.
– 25 – – 26 –
(Page 22)

– 27 – – 28 –
• IC Block Diagrams
– MAIN Board –
IC21 TB2118F-EL-S
IC301 CXA2510AQ-T4
VDD
AMP
AMP
AMP
VDD2
12 3 45 6 7 8 9 10
24 23 22 21 20 19 18 17 16 15
11 12
14 13
XO
OSC
CE
DIN
CK
DOUT
SR
I/O-1
I/O-2
OUT-1 OUT-2
VDD2 IFC
VDD FM IN AM IN D-GND FM CP OUT VT AM CP OUT VCC REG
A-GND
XI
SERIAL
INTERFACE I/O
PORT
OSCILLATOR
ON/OFF
BUFFER
REFERENCE
DIVIDER
PHASE
COMPARATOR 20BIT
IF COUNTER
PRESCALLER
12BIT
PROGRAMMABLE
COUNTER
+
–
REGULATOR
18BIT
18BIT 22BIT
40BIT SHIFT
REGISTER
REF
VCC
SEEK/RECP SEEK/RECP
+
–
SIG
4BIT SWALLOW
COUNTER
OUTPUT
PORT
+
+
IC331 TDA7462D
SE3L
SE3R
MUTE
SDA
SCL
PAUSE
OUT FL
OUT FR
OUT RL
OUT RR
SUBOUT+
SUBOUT–
VDD
GND
CREF
SE1L
SE1R
MD+
MD–
CDL+
CDL–
CDR–
CDR+
PDR
PDGND
PDL
SE2L
SE2R
INPUT
GAIN &
AUTO
ZERO
PAUSE
DETECT
INPUT MULTIPLEXER &
MIXING STAGE
REAR SIDE
SELECTOR FRONT SIDE
SELECTOR
LOUDNESS
CONTROL
CIRCUIT
INPUT
GAIN
BEEP
LOUDNESS
CONTROL
CIRCUIT
SOFT
MUTE
VOLUME
CONTROL
CIRCUIT
COMPANDER
TREBLE/
BASS
CONTROL
CIRCUIT
SUBWOOFER
OUT
FADER
SUBWOOFER
LP
IIC
BUS
DIGITAL CONTROL CIRCUIT
POWER
SUPPLY
FRONT
FADER
FRONT
FADER
REAR
FADER
REAR
FADER
VOICE BANDPASS
HP LP
SDA
SCL
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15
16
17
18
19
20
21
22
23
24
25
26
27
28
IC351 LB1930M-TLM
1
2
3
4
56
7
8
9
10
VCC
IN2
S-GND
IN1
NC NC
OUT2
NC
P-GND
OUT1
CONTROL
CIRCUIT
MOTOR
DRIVE
CIRCUIT
BUFFER
BUFFER
IC611 BA3918-V2
+
–
+
–
+
–
+
–
OVER VOLTAGE
PROTECT
REGULATOR
12 3 45 6 7 8 9 10 1211
NC
MODE2 MODE1
STB
VDD
AMP
VCC ANT
COM
AM
FM
GND
IC581 BA8270F-E2
1
2
3
4
5
6
7 8
9
10
14
13
12
11
BUS ON
SWITCH
RESET
SWITCH
BATTERY
SWITCH
BUS ON
RST
BATT
CLK
VREF
DATA
GND
VCC
RST
BUS ON
CLK IN
BU IN
DATA IN
DATA OUT
+
–
+
–+–
+
–
+–
12345 6 7 8 9 10
20
19
18
17
16
15
14
13
12
11
2122232627282930
31
32
33
34
37
38
39
40
2425
PBFB2
PBRIN2
PBREF2
PBFIN2
35
36
PBGND
VCT
PBFIN1
PBREF1
PBRIN1
PBFB1
PBEQ2
PBOUT2
VCC
TAPEIN2
AUXIN2
MSLPF
LINEOUT2
TCH2
NC
PLAY
FF
MSTC
DGND
MSOUT
NC
NRSW
INSW
TAPESW
MSMODE
DRSW
MSSW NC TCH1 LINEOUT1 DIREF AUXIN1 TAPEIN1 PBEQ1 PBOUT1 GND
F2
120µ/
70µ
X1
X1
VCT
+
F1
120µ/
70µNR
OFF/B
F3
LPF
VCC
DETECT
MS ON/
OFF
NR
MODE
FWD/RVS
TAPE EQ
TAPE/AUX
NR BIAS
NR
MS
MODE
OFF/B
T2
T1

– 29 –
• Waveforms
– MAIN Board –
1IC21 1(XT OUT)
2IC501 !∞ (XT IN)
3IC501 !£ (OSC IN)
0.2 Vp-p
97.6 ns
1.7 Vp-p
30.5 µ s
1.3 Vp-p
54.2 ns
2.7 Vp-p
27 µ s
– KEY Board –
1IC901 ^º OSC

– 30 –
6-7. IC PIN FUNCTION DESCRIPTION
•MAIN BOARD IC501 MN101C12GTA1 (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Function
1 AVREF– IReference voltage (0V) input terminal (for A/D converter)
2VSM I FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU1)
(A/D input)
3 KEYIN1 I
Key input terminal (A/D input)
(LSW921 to LSW923, LSW925, LSW926, LSW928 to LSW933)
6, PRESET DISC –/+, DSPL, LIST, 6, 5 ENTER, 4 n, 3 PLAY MODE, 2 SET UP, 1 N
keys input
4 KEYIN0 IKey input terminal (A/D input) (LSW901 to LSW903, S901, LSW905, LSW906)
OFF, SOURCE, MODE *, SEEK/AMS =0– +)+, SOUND, SHIFT keys
input
5 D-BASS IN I D-BASS switch (S981) input terminal (A/D input)
6 DSTSEL I Destination setting terminal (fixed at center voltage in this set)
7 FUNC-SEL ISetting terminal for the function select (fixed at “L” in this set)
8NCO ONot used (open)
9 RC-IN0 I Rotary remote commander key input terminal (A/D input)
10 AVREF+ IReference voltage (+5V) input terminal (for A/D converter)
11 VDD — Power supply terminal (+5V)
12 OSC OUT O Main system clock output terminal (18.432 MHz)
13 OSC IN I Main system clock input terminal (18.432 MHz)
14 GND — Ground terminal
15 XT IN I Sub system clock input terminal (32.768 kHz)
16 XT OUT O Sub system clock output terminal (32.768 kHz)
17 GND —Ground terminal
18 RC-IN1 I Rotary remote commander shift key input terminal “L”: shift
19 SYSRST O Reset signal output to the SONY bus interface (IC581) “L”: reset
20 BUS-ON O Bus on/off control signal output to the SONY bus interface (IC581) “L”: bus on
21 UNISO O Serial data output to the SONY bus interface (IC581)
22 UNISI I Serial data input from the SONY bus interface (IC581)
23 UNICKO O Serial data transfer clock signal output to the SONY bus interface (IC581)
24 UNICKI ISerial data reading clock signal input for the SONY bus interface Not used (open)
25 NCO ONot used (open)
26 KEYACK IInput of acknowledge signal for the key entry Acknowledge signal is input to accept function
and eject keys in the power off status On at input of “H”
27 NOSESW I Front panel block remove/attach detection signal input terminal
“L”: front panel is attached
28 BU-IN IBattery detect signal input from the SONY bus interface (IC581) and battery detect circuit
“L” is input at low voltage
29 SIRCS ISircs remote control signal input from the remote control receiver (IC951)
30 TEL-ATT I Telephone muting signal input terminal At input of “H”, the signal is attenuated by –20 dB
Not used (fixed at “L”)
31 TEST-IN I Setting terminal for the test mode “L”: test mode, Normally: fixed at “H”
32 RAMBU I Internal RAM reset detection signal input from the XC61BN3312MR (IC552)
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset
33 RESET I System reset signal input from the reset signal generator (IC551) and reset switch (S551)
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
34 VOL-MUT O Muting control signal output to the electrical volume (IC331)
Volume minimum: “∞” output (“H” active)

– 31 –
Pin No. Pin Name I/O Function
35 BEEP O Beep sound drive signal output terminal
36 AMP-MUT O Muting on/off control signal output to the power amplifier (IC751) “L”: muting on
37 AMP ON O Standby on/off control signal output to the power amplifier (IC751)
“L”: standby mode, “H”: amp on
38 PLL-CKO O PLL serial data transfer clock signal output to the FM/AM PLL (IC21)
39 PLL-CE O PLL chip enable signal output to the FM/AM PLL (IC21) “H” active
40 PLL-SO O PLL serial data output to the FM/AM PLL (IC21)
41 PLL-SI I PLL serial data input from the FM/AM PLL (IC21)
42 LCD-SO O Serial data output to the liquid crystal display driver (IC901)
43 LCD-CE O Chip enable signal output to the liquid crystal display driver (IC901) “H” active
44 LCD-CKO O Serial data transfer clock signal output to the liquid crystal display driver (IC901)
45 VOL-SIO I/O Two-way data bus with the electrical volume (IC331)
46 NCO ONot used (open)
47 VOL-CKO O Bus clock signal output to the electrical volume (IC331)
48 ACC-IN I Accessory detect signal input terminal “L”: accessory on
49 MUT O Audio line muting on/off control signal output terminal “H”: muting on
50 NCO ONot used (open)
51 AMSON O Tape auto music sensor control signal output to the CXA2510AQ (IC301)
“L” is output to lower the gain for audio level at FF/REW mode
52 N/R-OUT O Forward/reverse direction control signal output to the CXA2509AQ (IC301)
“L”: forward direction, “H”: reverse direction
53 MTLON I/O
METAL control in/out terminal
At initial mode: valid/invalid selection input of METAL function (valid at “L” input)
At normal mode: METAL on/off control signal output to the CXA2510AQ (IC301)
(METAL on at “H” output)
54 TAPE-MUT O Tape muting on/off control signal output to the CXA2510AQ (IC301) “H”: muting on
Active at ATA, FF/REW mode
55 DOLON I/O
Dolby control in/out terminal
At initial mode: valid/invalid selection input of dolby function (valid at “L” input)
At normal mode: dolby on/off control signal output to the CXA2510AQ (IC301)
(dolby on at “H” output)
56 AMSIN I Whether a music is present or not from CXA2510AQ (IC301) is detected at auto music sensor
“L”: music is present, “H”: music is not present
57 to 75 NCO ONot used (open)
76 ST-MONO I/O FM stereo broadcasting detection signal input from the FM/AM tuner unit (TU1), or forced
monaural control signal output to the FM/AM tuner unit (TU1)
“L” is input in the FM stereo mode, or “L” is output in the forced monaural mode
77 SD-IN IStation detector detect input from the FM/AM tuner unit (TU1)
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
78 RE-IN0 I
79 RE-IN1 I
80 AD-ON OA/D converter power control signal output terminal
When the KEYACK (pin @§) that controls reference voltage power for key A/D conversion input
is active, “L” is output from this terminal to enable the input
81 POWSEL I Power select switch (S501) input terminal “L”: off (halt mode), “H”: on (operation mode)
82 ILL-ON O
83 REEL I Rotation detect signal input from supply reel sensor and take-up reel sensor on the deck
mechanism
Power on/off control signal output of the illumination LED and liquid crystal display driver
(IC901) “H”: power on Depends on initial setting of power select switch (S501)
Power select switch (S501) on: “H” output at the accessory on
Power select switch (S501) off: “H” output at the power on
Dial pulse input of the rotary encoder (RE900)
(for VOLUME/BASS/TREBLE/BALANCE/FADER control)

– 32 –
Pin No. Pin Name I/O Function
84 POS3 I
85 POS2 I
86 POS0 I
87 POS1 I
88 LM-LOD O Motor drive signal output to the loading/tape operation motor drive (IC351) “H” active
(For the loading direction and forward side operation) *1
89 LM-EJ O Motor drive signal output to the loading/tape operation motor drive (IC351) “H” active
(For the eject direction and reverse side operation) *1
90 TAPEON O Tape system power supply on/off control signal output terminal “H”: tape on
91 CM-ON O Capstan/reel motor (M901) drive signal output terminal “H”: motor on
92 POWON O Main system power supply on/off control signal output to the BA3918 (IC611) “H”: power on
93 FM-ON O FM system power supply on/off control signal output to the BA3918 (IC611)
“L”: AM power on, “H”: FM power on
94 TU-ON O Tuner system power supply on/off control signal output to the BA3918 (IC611)
“H”: tuner power on
95 to 100 NCO ONot used (open)
Tape position (EJECT/FF/REW/
REV/FWD mode) detect input from
the tape operation switch on the
deck mechanism
POS3: “L”: REV and EJECT mode, “H”: others mode
POS2: “L”: REW mode, “H”: others mode
POS0: “L”: EJECT mode, “H”: others mode
POS1: “L”: FF and FWD mode, “H”: others mode
*1 Loading/tape operation motor control
STOP LOADING/
FORWARD EJECT/ REVERSE BRAKE
LM-LOD (pin *•)“L” “H” “L” “H”
LM-EJ (pin *ª)“L” “L” “H” “H”
Mode
Terminal