Teac AG-680 User manual

TEAC
SERVICE MANUAL
AG-680
AM/FM Stereo Receiver
* 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.
* A\ 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.
e 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
NOTES
9A07472100

CONTENTS
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Specifications
AMP Section. FM Section
Power output : 100W + 100W Tuning Range : 87.5 MHz - 108.0 MHz
(8Q, 1kHz, 0.1%) (100 kHz steps)
Total
Harmonic
Distortion
:
0.05%
Usable
Sensitivity
:3.0W
(95W, 1 kHz, 8Q) Image Rejection Ratio :60dB
S/N Ratio (Input Short)
Phono : 70 dB (IHF-A)
CD, AUX, Tape : 95 dB (IHF-A) Distortion (at 60dBwW):
Input Sensitivity/Impedance Mono : 0.3%
Phono(MM) : 6.0mMV/22kQ Stereo : 0.5%
CD, AUX, Tape : 200mV/22kQ Signal-to-Noise Ratio (at 65dBf, 1KHz) :
Maximun Input level Mono: 70 dB
Phono : 80mV Stereo : 65 dB
CD, Aux, Tape :3V Stereo Separation (1KHz) : 30 dB
Channel Separation(Input Short) : 70 dB
(1kHz, 10W) AM Section
Tuning Range : 530 kHz - 1,720 kHz
Residual
Noise
:
20Hz
to
40kHz
(10
kHz
steps)
Frequency Response Tone control Usable Sensitivity : 55 dB/m
Bass » +9 dB (100Hz) Selectivity : 40 dB (at + 15kHz)
Treble : + 9 dB (10kHz) Image Rejection Ratio :35dB
Required Speaker Impedance : 8Q to 16Q Distortion : 1% (at 85 dB/m)
Signal-to-Noise Ratio : 40 dB (at 85 dB/m)
General
Power Consumption : 320W Accessories
Power
Requirements
:
120V
AC,
60Hz
[USA]
AM
Loop
Antenna
X
1,
FM
Antenna
X
1
Dimensions (W x H x D) : 435 X 130 X 310 mm
Weight (net) : 7.0 kg
Standard Accessories :
Remote Control Unit 77
Operator’s Manual 27
* tmprovements may result in specification or
feature changes without notice.
SERVICE MANUAL

IC PIN FUNCTION (IC : ANAM1267T)}
PIN No. NAME 1/0
1, 25 VDD
[2 LOUDNESS 0
3 -20dB MUTE O
4 N-C
5 FUNC MUTE 0
6 SPB O
7 O
8 SP ON O
9 TAPE ‘H’ O
10 -
u :
12 DATA O
13 CLOCK O
|
15 TUNED |
16 PROTECTOR
17~19| KEY MATRIX
22,23,27,30 VSS -
26 BACK UP |
28,29 | VOL UP/ON
31 XIN |
32 X OUT 0
33 RESET |
34 REMOTE IN l
BUS IN
BUS OUT 0
POWER SW O
39 DATA O
40 CLOCK
a CE
42
DESCRIPTION
POWER SUPPLY (+5V)
LOUD LED CONTROL PORT
-20dB LED CONTROL PORT
FUNCTION MUTE CONTROL PORT
SPEAKER SYSTEM CONTROL PORT
SPEAKER SYSTEM CONTROL PORT
SPEAKER ON/OFF CONTROL PORT
TAPE MONITOR FUNCTION ‘H’
EUROPE VERSIOM 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
ENCODER VOLUME UP/DOWN
8MHz CRYSTAL CONNECTING TERMINAL
SYSTEM RESET PULSE INPUT
REMOTE CONTROL SIGNAL INPUT
DATA OUT
PLL DATA CONTROL PORT
SPEAKER A LED CONTROL PORT
SPEAKER B LED CONTROL PORT
ON/STBY LED CONTROL PORT
43 CLOCK
44 DATA IN
46 | SPEAKER ‘A’
47 SPEAKER ‘B’
48 ON/STAND BY
[50 | VFL
52 ~ 60 GRID
SEGMENT
OPTION A
OPTION B
(-33V) NEGATIVE POWER SUPPLY FOR FIP BLINKING
FIP GRID CONTROL OUTPUTS
FIP SEGMENT CONTROL OUTPUTS
AREA OPTION PORT
85
OPTION C
SERVICE MANUAL

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PIN ASSIGNMENTS
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(S28) P96 seftr— ~VKK
(S21) P97 r— Pe7
(S22) PD® r— Pes
(S23) POI [—] Pes
(S24) PD2 I~ P@4
($25)
PD3
I—
Pea
($26) PD4 r——] Pe2
($27) PDS [— Pe!
($28) PD6 [——] Pee
(S829) PDT [—) Pi?
(S3@) PEB [—] PIé
(S31) PEI [— Pts (1C2)
($32) PE2 [——] P14 (PPG)
(833) PES c— P13 (BVO)
(S34) PE4 Cc Pt 2 (INT2/TC!)
($35) PES [— Pit (INTI)
(S36) PE6 [TJ «PIO CINT@)
(837) PE7 [—1 RESET
($38) PF@ O c— xOUuT
(S39) PFI [—J XIN
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BLOCK DIAGRAM F
1/0 Porte Output Ports 1/O Ports
P97 PB7 P77 P1D7 PIE7
' 1 ! 1 t ' '
PIS PBs P7® PSs@ P1D8 PIES PIF@
Power } VOD
Supply | vss
VET
Power
Supply
VKK
Reset [/0 RESET
System Controlier
Test pin TEST
Standby Controtier
net.
Timing
Generator
ime
Base
O—bit
Serial
registe
Resonator XIN High Time Timer
7Counters
Interfaces
Inst.
Gone
ctine:)
xOUT
Frequ
Clock
Decoder
Pins
Low
Generator
Watchdog
iY
Frequ
Timer
B-bit
A/D
Converter
P22 > VAREF PET {AIN7) P®7 PIT P33 P47
' t | ' t #
P2@ ~~ VASS PEB (AIN@) POG Pie P38 P4e
1/0 Ports

1C12 (TUNER) LAI836M BLOCK DIAGRAM
TOA 73180
1C22 (INPUT) LC4966
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VV
CONTROL
CIRCUIT
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SUPPLY

EE ALIGNMENT INSTRUCTIONS
EQUIPMENT NEEDED:
AM Signal Generator
FM Signal Generator
Oscilloscope
VTVMIAC, 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 Modulati Modulation f
Band odulation odulation requency
a at
AM 30% 400Hz
FM 100%(75KHz Dev.) 400Hz
@ ADJUSTMENT POINT
AM LOOP ANT FM ANT
RESET Sw
cedveuebauanercisenteosieescueat ee
ANT TERMINAL
Tl C127 T182 Feu
L2
a ts FM RF COIL (9. 1@Hz)
ls
fer
77S lL?) —— FM OBC COIL
= im
& aris tT) ——— FM IFT MONO THD)
=A S
f Epa (eee 711 —— MW ANT COIL
IC) z
T1@2—— MW OSC COIL
| ‘S} |
7183 yy
L7
$ C127 —— MW ANT TRIMMER (15@3KH2)
Hy
=
i 1104 —— MW IFT
& T1Q3 ——~ FM IFT (MONO T.H 0)
VR11} —-— FM SD ADS
VR\2 —— MW SD ADJ
13> —— PM(AM) VT
CUP11194
ri
FM OFFSET ADJ TP
TP.
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SERVICE MANUAL

| MEASUREMENTS AND ADJUSTMENTS
1.FM, AM TRACKING VOLTAGE ADJUSTMENTS
(FM,
AM)
DC
VOLTMETER
vissccsscsssansssteseennast
CONNECT
TO
TEST
POINT
TP1
and
GND
NO. Band Frequency | Adjust for Adjustment
1 | FM | 87.50MHz | 1.5V L7
2 | AM | 530KHz | IV T101
2. AM RF ADJUSTMENT
Signal Generator.........ecccseeee 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 T101, T104
AM 2 1510KHz Maximum sensitivity C127
3 Repeat steps 1 and 2 several times.
AC EVM OSCILLOSCOPE
tented
OUTPUT
terminal
3.FM-RF ADJUSTMENT
Signal Generator... cesses Connect to FM ANT JACK (FM IN) through the dummy.
AC EVM oscitoscoPE | NO. | Frequency Adjust for Adjustmert
1 90.10MHz Maximum Sensitivity L2, L5, Le
2 Repeat step 1 several times.
OUTPUT
terminal

4.FM MONO DISTORTION ADJUSTMENT
DC VOLT METER
Signal Generator
Distortion Meter
Connect to TP1(-), TP2(+) Through the choke coll (100¢H)
Connect to FM ANT Jack (FM IN) through the dummy.
Connect to the output.
7
NO. | Frequency Adjustment
1 100.10MHz DC Voltmeter OV T103
| |
2 100.10MHz Minimum T.H.D T103
_ J pstorTion 3 Repeat steps 1 and 2 Several times.
era aaa ANALYSER
5.FM/AM AUTO STOP LEVEL ADJUSTMENT
FM SIGNAL GENERATOR ............::eeseeees Connect to FM ANT Jack (FM IN) through the dummy
AM SIGNAL GENERATOR...........:scccesseeeees Connect to AM ANT, Coil through the Loop antenna
BAND STEP | SIGNAL GENERATOR Adjust for Adjustment
1 100.1MHz 30dB TUNED | Display OFF VR11
FM 4
2 100.1MHz 30dB TUNED | Display ON VR11
1 1000KHz 80dB TUNED | Display OFF VR12
AM
2 1000KHz 80dB TUNED | Display ON VRi2
8
SERVICE MANUAL

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SPEAKER TERMINAL IN/OUT TERMINAL ANT TERMINAL
CNI@
CNI6 (AC IN)
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POWER TRANSFORMER
CUPI1194
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ENCODER VOLUME
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