TEAC MCD-95 Service manual
CD/TUNER/AMPLIFIER
MC-D95
NOTES
PC boards shown are viewed from parts side.
The parts with no reference number or parts number in the
exploded views are not supplied.
As regards the resistors and capacitors, refer to the circuit
diagrams contained in this manual.
Parts marked with this sigh are critical components.
They must be replaced with identical components - refer to
the appropriate parts list and ensure exact replacement.
Parts of [ ] mark can be used only with the version
designated.
[J] : JAPAN [US] : U.S.A. [C] : CANADA
[E] : EUROPE [UK] : U.K. [GE] : GENERAL EXPORT
9A08312000
SERVICE MANUAL
2
Specifications
AMP Section
Output Power :
20 W/ch (0.5%, 6 ohms, 1 kHz)
Input Sensitivity : 200 mV
Frequency Response : 20 Hz to 40,000 Hz
General
Power Consumption : 60 W
Power Requirements : 120 V, 60 Hz [US]
230 V, 50 Hz [EUR]
Dimensions (W x H x D) : 175 x 140 x 360 mm
Weight (net) : 4.0 kg
Standard Accessories
Remote Control Unit
Operator’s Manual
AM Loop Antenna
FM Lead-type Antenna
Design and specifications are subject to change
without notice.
The illustrations may differ slightly from
production models.
FM Section
Frequency Response : 87.50 MHz to 108.00 MHz
(100 kHz steps) [US]
(50 kHz steps) [EUR]
Signal-to-Noise Ratio : Mono: 65 dB (Mono)
Stereo: 56 dB (Stereo)
AM Section
Frequency Response : 530 kHz to 1720 kHz [US]
(10 kHz steps)
: 522 kHz to 1620 kHz [EUR]
(9 kHz steps)
Signal-to-Noise Ratio : 35 dB
CD PLAYER Section
Signal-to-Noise Ratio : 80 dB ( with IHF “A” Filter)
T.H.D : 0.05% (1 kHz, 20 kHz LPF)
Channel Seperation : 55 dB (1 kHz)
Channel Balance : 1 dB
Frequency Response :
17 Hz - 20 kHz (±1.5 dB)
Wow Flutter : Bellow Measurable
CONTENTS
SPECIFICATIONS..................................................................................2
IC PIN FUNCTION .................................................................................3
MEASUREMENTS AND ADJUSTMENTS......................................................7
WIRING DIAGRAM ..............................................................................17
BLOCK DIAGRAM ...............................................................................19
SCHEMATIC DIAGRAM.........................................................................20
PRINTED CIRCUIT BOARDS ...................................................................27
MECHANISM ASS’Y ............................................................................31
EXPLODED VIEW ................................................................................35
ELECTRICAL PARTS LIST ......................................................................38
SERVICE MANUAL
3
PIN No. NAME I/O DESCRIPTION
VDD
HREQ
SLQCLK
SLQIN
SLQOUT
DATA
CLOCK
STEREO IN
TUNED
HPIN
PROTECTOR
KEY MATRIX
VSS
VAREF
BACK UP
X-TAL
X IN
X OUT
RESET
REMOTE IN
BUS IN
BUS OUT
SPEAKER
CE
DATA OUT
CLOCK
DATA IN
CLOCK
DATA
POWER
MUTE
VFL
GRID
SEGMENT
CD POWER
ON/STBY LED
TAPE ‘H’
MD ‘H’
JOG CONTROL
IC36 PIN FUNCTION (IC : BVITMP87PM78F)(AMP)
1, 25
6
7
8
9
12
13
14
15
16
17
19, 20, 21
22,23,27,30
24
26
28, 29
31
32
33
34
35
36
38
41
42
43
44
45
46
47
48
50
52 ~ 60
61 ~ 82
83 ~ 87
89
90
91
93
96, 97
POWER SUPPLY (+5V)
BUS for CD CLOCK
BUS for CD CHIP ENABLE
RESET for CD
MUTE for CD SINGLE
EUROPE VERSION RDS DATA CONTROL PORT
STEREO IN CONTROL INPUT
TUNED CONTROL INPUT
PROTECTOR IN PORT
KEY MATRIX PORTS
GND
A/D CONVERTOR REFERENCE VOLTAGE
BACK-UP MODE CONTROL INPUT
32.768kHz SUB CLOCK CONNECTING PORT
8MHz CRYSTAL CONNECTING TERMINAL
SYSTEM RESET PULSE INPUT
REMOTE CONTROL SIGNAL INPUT
REMOTE CONTROL SIGNAL INPUT
REMOTE CONTROL SIGNAL INPUT
SPEAKER ON/OFF PORT
PLL DATA CONTROL PORT
TDA7318D DATA CONTROL PORT
POWER ON/OFF
SIGNAL MUTE
(-33V) NEGATIVE POWER SUPPLY FOR FIP BLINKING
FIP GRID CONTROL OUTPUTS
FIP SEGMENT CONTROL OUTPUTS
AREA OPTION
CD POWER ON/OFF PORT
ON/STANDBY LED CONTROL PORT
ON TAPE FUNCTION ‘H’ OUTPUT PORT
ON MD FUNCTION ‘H’ OUTPUT PORT
VOL/BAL/BASS/TRE CONTROL JOG INPUT PORT
-
I/O
I/O
I
O
O
O
I
I
I
I
-
-
I
I
I
O
I
I
I
O
O
O
O
O
I
O
O
O
O
O
O
I
O
O
O
O
I
SERVICE MANUAL
4
PIN No. NAME I/O DESCRIPTION
VDD
BUS 0
BUS 1
BUS 2
BUS 3
BUCK
CCE
CDRE
MUTE
SIO CLOCK
SIO OUT
SIO IN
HREQ
VSS
X IN
X OUT
RESET
A
B
C
D
DSP POWER
UN CLAMP SW
T.U HEIGHT SW
HOLDER MODE SW
T.U HEIGHT SW
HOLDER HEIGHT SW
LOAD/CLAMP
OPEN SW
CLOSE/HP SW
DISC ON SW
DISC CENTER SW
IC 66 PIN FUNCTION (IC : BVITMP87PM78F)(CD)
1, 25
2
3
4
5
6
7
8
9
10
11
12
13
22,23,27,30
31
32
33
42
43
44
45
46
83
84
85
86
87
88
89
90
91
92
POWER SUPPLY (+5V)
BUS for CD DATA
BUS for CD DATA
BUS for CD DATA
BUS for CD DATA
BUS for CD CLOCK
BUS for CD CHIP ENABLE
RESET for CD
MUTE for CD SINGLE
BUS for CD DATA
GND
8MHz CRYSTAL CONNECTING TERMINAL
SYSTEM RESET
PLL DATA CONTROL PORT
CD POWER ON/OFF
MECHANISM SW CONDITION
-
I/O
I/O
I/O
I/O
I/O
I/O
O
O
I/O
I/O
I/O
I/O
-
I
O
I
O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
SERVICE MANUAL
5
PIN ASSIGNMENTS
(TOP VIEW)
PIN BLOCK DIAGRAM
SERVICE MANUAL
6
IC11 (TUNER) LA1836M BLOCK DIAGRAM
TDA7318D IC23(INPUT) LC4966
SERVICE MANUAL
7
ALIGNMENT INSTRUCTIONS
EQUIPMENT NEEDED:
AM Signal Generator
FM Signal Generator
Oscilloscope
VTVM(AC, DC)
Test loop antenna (AW Adjustment)
Dummy antenna (FM Adjustment)
Stereo signal modulator
Frequency counter
Distortion analyser
IMPORTANT
1. Check power-source voltage.
2. Set the function switch to band aligned.
3. Keep the signal input as low as possible to adjust accurately.
4. Modulation and modulation frequency.
Item
Modulation Modulation frequency
Band
AM 30% 400Hz
FM 100%(75KHz Dev.) 400Hz
ADJUSTMENT POINT
SERVICE MANUAL
8
MEASUREMENTS AND ADJUSTMENTS
1. FM, AM TRACKING VOLTAGE ADJUSTMENTS
(FM, AM) DC VOLTMETER........................... CONNECT TO TEST POINT TP1 and GND
NO. Band Frequency Adjust for Adjustment
1FM87.50MHz 1.5V L7
2AM 530KHz 1V T404
2. AM RF ADJUSTMENT
Signal Generator ........................ Connects to the AM ANT. Coil through the loop antenna.
Adjust for the indication of VTVM of the wave form of scope to be maximum.
BAND Step Frequency Adjust for Adjustment
1 610KHz Maximum sensitivity T104, L105
2 1510KHz Maximum sensitivity C107
3 Repeat steps 1 and 2 several times.
AM
3. FM-RF ADJUSTMENT
Signal Generator ........................ Connect to FM ANT JACK (FM IN) through the dummy.
NO. Frequency Adjust for Adjustment
1 90.10MHz Maximum Sensitivity L2, L5, L6
2 Repeat step 1 several times.
SERVICE MANUAL
9
4. FM MONO DISTORTION ADJUSTMENT
DC VOLT METER ........................Connect to TP1(-), TP2(+) Through the choke coll (100 H)
Signal Generator........................Connect to FM ANT Jack (FM IN) through the dummy.
Distortion Meter .........................Connect to the output.
NO. Frequency Adjust for Adjustment
1 100.10MHz DC Voltmeter 0V T103
2 100.10MHz Minimum T.H.D T103
3 Repeat steps 1 and 2 Several times.
5. FM/AM AUTO STOP LEVEL ADJUSTMENT
FM SIGNAL GENERATOR ........................Connect to FM ANT Jack (FM IN) through the dummy
AM SIGNAL GENERATOR.........................Connect to AM ANT, Coil through the Loop antenna
BAND STEP SIGNAL GENERATOR Adjust for Adjustment
1 100.1MHz 30dB Display OFF VR12
2 100.1MHz 30dB Display ON VR12
1 1000KHz 80dB Display OFF VR11
2 1000KHz 80dB Display ON VR11
AM
FM
TUNED
TUNED
TUNED
TUNED
SERVICE MANUAL
10
PIN No. NAME DESCRIPTION
PW GND
OUT (-) 1
PV
CC1
OUT (+) 1
V
IN1
VRI
VCI
VIN2
OUT (+) 2
PV
CC2
OUT (-) 2
PW GND
PW GND
OUT (-) 3
PV
CC3
OUT (+) 3
V
IN3
S GND
S V
CC
VIN4
OUT (+) 4
P
VCC4
OUT (-) 4
PW GND
TA2092N (POWER DRIVER)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Power GND
Connected to substrate.
pin are connected inside.
Inverted output for CH1
Supply terminal of output stage for CH1
Supply terminal of output stage are not connected to other channel terminal.
Non-inverted output for CH1
Input for CH1. Not biased inside
Input reference voltage
Under condition of V
RI 1.8V, internal bias circuit is shut off.
No signal input condition : V
RI = VIN
Output reference voltage. VOUT = VCI = (VCC-VF)/2
Input for CH2
Non-inverted output for CH2
Supply terminal of output stage for CH2
Inverted output for CH2
Power GND
Power GND
Inverted output for CH3
Supply terminal of output stage for CH3
Non-inverted output for CH3
Input for CH3
Supply terminal of small signal GND
Small signal GND
Input for CH4
Non-invered output for CH4
Supply terminal of output stage for CH4
Inverted output for CH4
Power GND
BLOCK DIAGRAM
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