Teac T-R670 User manual

TT--RR667700
SERVICE MANUAL
AM / FM Stereo Tuner
Effective : April, 2002 S-0056A
CONTENTS
1 SPECIFICATIONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・2
2 ADJUSTMENTS AND CHECKS ・・・・・・・・・・・・・・・・・・・・・・・・3
3 EXPLODED VIEWS AND PARTS LIST ・・・・・・・・・・・・・・・・・6
4 PC BOARDS AND PARTS LIST ・・・・・・・・・・・・・・・・・・・・・・・・8
NOTES
●PC boards shown are viewed from parts side.
●The parts with no reference number or no 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 sign are safety critical components. They
must be replaced with identical components - refer to the appropriate
parts list and ensure exact replacement.

1 SPECIFICATIONS
−2−
FM Tuner Section
(Without notes 98 MHz, 65 dBf)
Tuning Range: 87.5 MHz – 108.0 MHz (100 kHz steps)
Usable Sensitivity (IHF):
Mono: 11.2 dBf
50 dB Quieting Sensitivity:
Mono: 15 dBf
Stereo: 20 dBf
Total Harmonic Distortion (1 kHz):
Mono: 0.4%
Stereo: 0.5%
Frequency Response: 30 Hz – 15 kHz, +1/ –1.5 dB
Stereo Separation (1 kHz): 40 dB
Signal-to-Noise Ratio:
Mono: 72 dB
Stereo: 70 dB
AM Tuner Section
Tuning Range: 530 kHz – 1,720 kHz (10 kHz steps)
Usable Sensitivity: 55 dB/m
Total Harmonic Distortion: 0.8% at 85 dB/m
Signal-to-Noise Ratio: 45 dB at 85 dB/m
General
Power Requirements: 120/230 V AC, 50-60 Hz
Power Consumption: 8 W
Dimensions (W x H x D): 435 x 102 x 270 mm
Weight (net): 3.6kg
Standard Accessories:
AM Loop Antenna x 1
FM T-type Antenna x 1
Matching Transformer x 1
Remote Control Unit (RC-789) x 1
●Improvements may result in specifications and features
changing without notice.
Voltage Conversion
(General export models only)
Be sure to remove the power cord from the AC outlet before
repositioning the voltage converter switch.
1. Locate the voltage selector on the rear panel.
2. Using a flat-bladed screwdriver, set to the appropriate
230V or 120V position according to your area.
IN NORTH AMERICA USE ONLY ON 120 V SUPPLY.

2 ADJUSTMENTS AND CHECKS
−3−
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
MAIN PCB
T2
T3-2
T4
T5
TVR5
TVR4
TVR2
TVR1
TVR3
T1
TVC1
TVC2
TP1
L2
RF1
P5 P6
T1
T3-1

−4−
1. AM TRACKING VOLTAGE ADJUSTMENTS
DC VOLTMETER ........................... CONNECT TO TEST POINT P5 and GND
NO. Band Frequency Adjust for Adjustment
1AM 530KHz 2.2V T1
2AM 1720KHz 9.5V TVC1
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 630KHz Maximum sensitivity L2, T2
2 1420KHz Maximum sensitivity TVC2
3 Repeat steps 1 and 2 several times.
AM
NO. Frequency Adjust for Adjustment
1 97.8MHz L rejection T4
2
P5
GND
3 97.8MHz
97.8MHz
TVR3
T5
L, R rejection
R rejection
3. FM 19kHz REJECTION ADJUSTMENT

−5−
4. FM MONO DISTORTION ADJUSTMENT
DC VOLT METER ........................Connect to TP1(-), TP1(+) 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 97.8MHz DC Voltmeter 0V T3-1
2 97.8MHz Minimum T.H.D T3-2
3
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 97.8MHz 16dB Display ON TVR1
1 630KHz 74dB Display ON TVR2
AM
FM TUNED
TUNED
4 Repeat steps 1 and 2 Several times.
97.8MHz Minimum T.H.D T1
TP1(-)
TP1(+)
NO. Frequency Adjust for Adjustment
1 97.8MHz L separation TVR5
2 97.8MHz TVR4R separation
6. FM SEPARATION ADJUSTMENT

−6−
2
4
5
6
12
13
17
16
15
14
21
20
19
18
23
22
3
7
8
9
10
11
1
3 EXPLODED VIEWS AND PARTS LIST

−7−
EXPLODED VIEW LIST
REF.NO. PARTSNO. DESCRIPTION REMARKS
1 9A09229700 FACEPLATE 75L837W0248*
2 9A09230500 WASHER,POWERKNOB 85A637******
3 9A09231000 WASHER 85A638******
4 9A09230400 POWERKNOB 80KB431*****
5 9A09230300 ACRY 85A398******
6 9A09230600 PUSHKNOB 80KB432*****
7 9A09230200 ACRY 85A636******
8 9A09230700 PUSHKNOB 80KB433*****
9 9A09230800 PUSHKNOB 80KB434*****
10 9A09230900 PUSHKNOB 80KB435*****
11 9A09229800 SUBPLATE 78C266000000
12 9A09233400 KEYPCBASSY TR670B3851**
13 9A09231200 FEET 81AD287*****
14 9A09230000 BOTTOMPLATE 78C266200000
15 9A09231700 BRACKER,U‑TYPE 78C206000000
16 9A09233500 TRANSFORMERPCBASSY TR670B3852**
17 9A09230100 UPPERCOVER 78C266300000
18 9A09233300 MAINPCBASSY TR670B3850**
19 9A09233600 SELECTSWPCBASSY TR670B3853**
20£9A09231500 BUSHING 98BSB4F4****
21£9A09231400 ACCORD 651B2U56B24P
22 9A09231300 HOLER,ANT 85A271******
23 9A09229900 REARPLATE 78C2661W0245
F1,F2£9A09231900 FUSE0.5A/250VT 265200P521TQ
F3£9A09232000 FUSE0.1A/250VT 265200P121TQ
INCLUDED ACCESSORIES
REF.NO. PARTSNO. DESCRIPTION REMARKS
9A08814500 OWNER'SMNL,E/F 9904TR670***
9A09234200 REMOTECONTROLUNIT 62CR19C10001
9A09234300 BATTERY 250027******
9A09233800 LOOPANT 64LA75******
9A09233900 TVDIPOLEANT 64T0001*****
9A09234000 ANTADAPTER 68AJ20092046

−8−
KEY PCB
MAIN PCB TRANSFORMER PCB SELECT SW PCB
4 PC BOARDS AND PARTS LIST

MAIN PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09233300 MAINPCBASSY
9A09245200 PCB,B3850/B3852/B3853
C95£9A09241800 C,ELEC2200UF/25V
C97£9A09240000 C,ELEC100UF/100V
C98£9A09240300 C,ELEC47UF/63VNP
D1‑D4 9A09237300 DIODE,1N4148
D5 9A09237500 ZENERDIODE,5.6V0.5W
D6 9A09237600 ZENERDIODE,22V0.5W
D7‑D10£9A09237400 DIODE,1N4007
F1‑F3 9A09241200 FUSEHOLDER
J1 9A09244500 RCAJACK,HSP‑242V1‑3
J2 9A09245000 WAFER,5045‑7P
J3 9A09245100 WAFER,5045‑8P
J4 9A09244900 WAFER,5045‑6P
J8 9A09244800 WAFER,5045‑2P
JP1 9A09242500 ANTTERMINAL
L1 9A09242600 CHOKE,2.2UH
L2 9A09242800 I.F.T,LA‑003
P2 9A09244600 TERMINALGND
P5,P6 9A09244700 PIN
Q1,Q2 9A09240500 TR,2SC1815BL
Q3 9A09240600 TR,2SA1015
Q4 9A09240500 TR,2SC1815BL
Q5 9A09241600 TR,2SK192A
Q6‑Q8 9A09240500 TR,2SC1815BL
Q10 9A09240500 TR,2SC1815BL
Q12,Q13 9A09240700 TR,2SC3327A
Q14 9A09240500 TR,2SC1815BL
Q15 9A09240600 TR,2SA1015
Q16,Q17 9A09240700 TR,2SC3327A
Q19 9A09240500 TR,2SC1815BL
Q20 9A09242700 TR,2SB633
Q21,Q22 9A09240500 TR,2SC1815BL
Q23 9A09240800 TR,2SA965
R35 9A09241500 NTCTHERMISTORS,300OHM
R41£9A09241300 R,M.O.F2W100
R82£9A09241300 R,M.O.F2W100
R90£9A09241400 R,M.O.F1W4K7
RF1 9A09243300 FMTUNER,TFFJ4E570A
T1 9A09242900 I.F.T,LO‑O03
T2 9A09243000 I.F.T,A‑8BC02‑8072
T3 9A09243100 I.F.T,0203‑W009
T4,T5 9A09243200 I.F.T,10DF01
TP1 9A09244400 PIN,2541‑2P
TSW(SW2) 9A09243400 TACTSW,SFKHHLU1714
TVC1,TVC2 9A09243500 TRIMMER,CTY‑112B8P
TVR1 9A09241000 TVR,6H‑TYPE30K
TVR2 9A09240900 TVR,6H‑TYPE10K
TVR3 9A09241000 TVR,6H‑TYPE30K
TVR4,TVR5 9A09241100 TVR,6H‑TYPE1M
U1 9A09241900 IC,AN278
U2 9A09242000 IC,LA1266
U3 9A09242100 IC,LA3450
U4 9A09242200 IC,TC9257P
U5,U7£9A09242300 IC,AN7805
MAIN PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
U8£9A09242400 IC,AN7812
U8 9A09244300 HEATSINK
VD1,VD2 9A09243600 VARICAP,1SV149
X1 9A09243700 CRYSTAL,7.2MHZ
Z1 9A09243800 CERAMICFILTER,SFZ10.7MS2
Z2 9A09243900 CERAMICFILTER,SFZ10.7MS3
Z3 9A09244000 CERAMICFILTER,SFZ450B
Z4 9A09244200 CERAMICFILTER,BFU450CN
Z5 9A09244100 CERAMICFILTER,CSB456F11
KEY PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09233400 KEYPCBASSY
9A09248000 PCB,B3851
9A09247200 FLTUBE,25U39167TAN
D1 9A09237300 DIODE,1N4148
IR1 9A09247100 INFERREDRECEIVER,IR‑9G
J1TOJ2 9A09247800 CONNECTOR,ED‑4917P
J2TOJ3 9A09247700 CONNECTOR,ED‑E678P
J3TOJ8 9A09247600 CONNECTOR,ED‑C922P
Q1 9A09240600 TR,2SA1015
R1 9A09246700 R,NETWORKS10KX78P7R
R2 9A09246800 R,NETWORKS10KX45P4R
R9 9A09246600 R,NETWORKS10KX67P6R
R10 9A09246700 R,NETWORKS10KX78P7R
SW1‑SW8 9A09247000 TACTSW,SKHVBK3710
SW10‑SW23 9A09247000 TACTSW,SKHVBK3710
U2 9A09246500 IC,TMP87PM78F
U3 9A09246300 IC,TC74HCU04
U4 9A09246900 IC,93C66
U5 9A09246400 IC,JRC6356E
X1 9A09247400 CRYSTAL,8MHZ
X2 9A09247500 CRYSTAL,32.768KHZ
TRANSFORMER PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09233500 TRANSFORMERPCBASSY
9A09245200 PCB,B3850/B3852/B3853
J5TOJ4 9A09245600 CONNECTOR,ED‑4886P
J7 9A09245300 WAFER,3963‑5P3T
J9 9A09245400 WAFER,3963‑3P2T
T6£9A09245500 TRANSFORMER
SELECT SW PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09233600 SELECTSWPCBASSY
9A09245200 PCB,B3850/B3852/B3853
£9A09245700 SLIDESW,S14‑22AH
9A09245800 CONNECTOR,ED‑E695P3T
−9−

86745231
E
D
C
B
A
SCHEMATIC DIAGRAM
T-R670
MAIN PCB, TRANSFORMER PCB, SELECT SW PCB
AM/FM Stereo Tuner
TT--RR667700
1 st Issue; October 2001
INSTRUCTIONS FOR SERVICE PERSONNEL
BEFORE RETURNING APPLIANCE TO THE CUSTOMER, MAKE LEAKAGE-
CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT.

86745231
E
D
C
B
A
SCHEMATIC DIAGRAM
T-R670
KEY PCB
AM/FM Stereo Tuner
TT--RR667700
1 st Issue; October 2001