Aiwa XR-M88 User manual

COMPACT DISC STEREO SYSTEM
XR-M88
S/M Code No. 09-996-333-3R3
HC(S)
SERVICE MANUAL
REVISION
This Service Manual is the “Revision Publishing” and replaces “Simple Manual”
(S/M Code No.09-996-333-3T3) .
DATA
• BASIC TAPE MECHANISM : TN-708C-128R
• BASIC CD MECHANISM : KSM-620AAA
SYSTEM
XR-M88
RECEIVER
RX-LM88
CD/
CASSETTE
FD-LM88
SPEAKER
SX-LM200

2
TABLE OF CONTENTS
SPECIFICATIONS................................................................................................................................... 3
ACCESSORIES/PACKAGE LIST............................................................................................................ 3
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING/
Precaution to replace Optical block......................................................................................................... 4
MODEL NO.RX-LM88
ELECTRICAL MAIN PARTS LIST....................................................................................................... 5, 6
TRANSISTOR ILLUSTRATION............................................................................................................... 7
FL (13-ST-36GNAK) GRID ASSIGNMENT/ANODE CONNECTION ...................................................... 8
WIRING-1 (POWER AMP)................................................................................................................ 9, 10
SCHEMATIC DIAGRAM-1 (POWER AMP) ..................................................................................... 11, 12
WIRING-2 (FRONT)........................................................................................................................ 13, 14
SCHEMATIC DIAGRAM-2 (FRONT)............................................................................................... 15, 16
WIRING-3 (TUNER)........................................................................................................................ 17, 18
SCHEMATIC DIAGRAM-3 (TUNER)............................................................................................... 19, 20
ELECTRICAL ADJUSTMENT............................................................................................................... 21
PRACTICAL SERVICE FIGURE ........................................................................................................... 22
IC DESCRIPTION........................................................................................................................... 23, 24
IC BLOCK DIAGRAM............................................................................................................................ 25
MECHANICAL EXPLODED VIEW 1/1 .................................................................................................. 26
MECHANICAL PARTS LIST 1/1............................................................................................................ 27
MODEL NO.FD-LM88
DISASSEMBLY INSTRUCTIONS .................................................................................................... 28-32
ELECTRICAL MAIN PARTS LIST.................................................................................................... 33-35
TRANSISTOR ILLUSTRATION............................................................................................................. 36
WIRING-1 (CD) ................................................................................................................................ 37-40
SCHEMATIC DIAGRAM-1 (CD 1/2)................................................................................................ 41, 42
SCHEMATIC DIAGRAM-2 (CD 2/2)................................................................................................ 43, 44
WIRING-2 (TAPE) ........................................................................................................................... 45, 46
WIRING-3 (KEY) ............................................................................................................................. 47, 48
WIRING-4 (FUNC) .......................................................................................................................... 49, 50
SCHEMATIC DIAGRAM-3 (TAPE/FUNC/KEY) ............................................................................... 51, 52
TEST MODE ......................................................................................................................................... 53
ELECTRICAL ADJUSTMENT......................................................................................................... 54, 55
PRACTICAL SERVICE FIGURE ........................................................................................................... 56
IC DESCRIPTION............................................................................................................................ 57-62
IC BLOCK DIAGRAM............................................................................................................................ 63
MECHANICAL EXPLODED VIEW 1/1 .................................................................................................. 64
MECHANICAL PARTS LIST 1/1............................................................................................................ 65
TAPE MECHANISM EXPLODED VIEW 1/1.......................................................................................... 66
TAPE MECHANISM PARTS LIST 1/1 ...................................................................................................67
CD MECHANISM EXPLODED VIEW 1/1 ............................................................................................. 68
CD MECHANISM PARTS LIST 1/1 ....................................................................................................... 69
MODEL NO.SX-LM200
SPEAKER DISASSEMBLY INSTRUCTIONS ....................................................................................... 70
SPEAKER PARTS LIST 1/1 .................................................................................................................. 71

3
SPECIFICATIONS
•
Design and specifications are subject to change without
notice.
•
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol
are trademarks
of Dolby Laboratories Licensing Corporation.
•
The word “BBE” and the “BBE symbol” are trademarks
of BBE Sound,Inc.
Under license from BBE Sound,Inc.
REF. NO PART NO. KANRI DESCRIPTION
NO.
ACCESSORIES/PACKAGE LIST
1 8Z-CLB-911-010 IB,H(EC-K)M
2 87-043-115-010 ANT,FEEDER FM
3 87-A90-030-010 ANT,LOOP AM-NC C
4 8Z-CLB-955-010 RC UNIT,ZCL-11
! 5 87-A90-786-010 PLUG,CONVERSION IR46

4
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
VAROITUS!
Laiteen Käyttäminen muulla kuin tässä käyttöohjeessa mainit-
ulla tavalla saattaa altistaa käyt-täjän turvallisuusluokan 1 ylit-
tävälle näkymättömälle lasersäteilylle.
VARNING!
Om apparaten används på annat sätt än vad som specificeras i
denna bruksanvising, kan användaren utsättas för osynling
laserstrålning, som överskrider gränsen för laserklass 1.
Caution: Invisible laser radiation when
open and interlocks defeated avoid expo-
sure to beam.
Advarsel:Usynling laserståling ved åbning,
når sikkerhedsafbrydere er ude af funktion.
Undgå udsættelse for stråling.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
ATTENTION
L'utilisation de commandes, réglages ou procédures autres que
ceux spécifiés peut entraîner une dangereuse exposition aux
radiations.
ADVARSEL!
Usynlig laserståling ved åbning, når sikkerhedsafbrydereer ude
af funktion. Undgå udsættelse for stråling.
This Compact Disc player is classified as a CLASS 1 LASER
product.
The CLASS 1 LASER PRODUCT label is located on the rear
exterior.
This set employs laser. Therefore, be sure to follow carefully the
instructions below when servicing.
WARNING!
WHEN SERVICING, DO NOT APPROACH THE LASER EXIT
WITH THE EYE TOO CLOSELY. IN CASE IT IS NECESSARY TO
CONFIRM LASER BEAM EMISSION. BE SURE TO OBSERVE
FROM A DISTANCE OF MORE THAN 30cm FROM THE
SURFACE OF THE OBJECTIVE LENS ON THE OPTICAL
PICK-UP BLOCK.
CLASS 1
KLASSE 1
LUOKAN 1
KLASS 1
LASER PRODUCT
LASER PRODUKT
LASER LAITE
LASER APPARAT
Precaution to replace Optical block
(KSM-620AAA)
1) After the connection, remove solder shown in
the right figure.
Body or clothes electrostatic potential could ruin
laser diode in the optical block. Be sure ground
body and workbench, and use care the clothes
do not touch the diode.
SOLDER

5
MODEL NO. RX-LM88
REF. NO PART NO. KANRI DESCRIPTION
NO.
REF. NO PART NO. KANRI DESCRIPTION
NO.
ELECTRICAL MAIN PARTS LIST
IC
87-070-127-110 IC,LC72131 D
87-A20-913-010 IC,LA1837NL
8Z-CL1-627-010 IC,LC866532A-5L31RX
TRANSISTOR
89-213-702-010 TR,2SB1370 (1.8W)
87-026-610-080 TR,KTC3198GR
87-A30-076-080 C-TR,2SC3052F
87-A30-075-080 C-TR,2SA1235F
87-A30-234-080 TR,CSC4115BC
87-026-609-080 TR,KTA1266GR
87-A30-073-080 C-TR,RT1N 141C
87-A30-190-080 TR,CC5551
87-A30-307-010 TR,2SD2619
87-A30-306-010 TR,2SB1677
87-A30-119-040 C-TR,2SC3906K R
87-A30-047-080 TR,CSD655E
87-A30-107-070 C-TR,CMBT5401
87-A30-074-080 C-TR,RT1P 141C
87-A30-071-080 C-TR,RT1N 144C
87-A30-087-080 C-FET,2SK2158
87-A30-072-080 C-TR,RT1P 144C
89-327-143-080 TR,2SC2714 (0.1W)
89-505-434-540 C-FET,2SK543(4/5)
87-A30-086-070 C-TR,CSD1306E
DIODE
87-070-345-080 DIODE,IN4148
87-070-178-090 DIODE,1N5402-BD54
87-070-274-080 DIODE,1N4003 SEM
87-A40-345-080 ZENER,MTZJ10C
87-A40-269-080 C-DIODE,MC2836
87-A40-270-080 C-DIODE,MC2838
87-A40-004-080 ZENER,MTZJ16A
87-A40-312-080 ZENER,DZ33M
87-A40-313-080 C-DIODE,MC 2840
87-A40-488-080 DIODE,1SS244
87-A40-509-080 ZENER,MTZJ6.8C
87-017-149-080 ZENER,HZS6A2L
87-020-465-080 DIODE,1SS133 (110MA)
POWER C.B
C101 87-010-387-080 CAP,E 470-25 SME
C102 87-016-051-090 CAP,E 2200-35 SMG
C103 87-016-051-090 CAP,E 2200-35 SMG
C106 87-010-196-080 CHIP CAPACITOR,0.1-25
C107 87-010-196-080 CHIP CAPACITOR,0.1-25
C108 87-010-196-080 CHIP CAPACITOR,0.1-25
C109 87-010-196-080 CHIP CAPACITOR,0.1-25
C110 87-010-928-090 CAP,E 4700-25 SMG
C111 87-012-140-080 CAP 470P
C113 87-010-384-080 CAP, ELECT 100-25V
C114 87-010-060-080 CAP, ELECT 100-16V
C115 87-010-235-080 CAP,E 470-16 SME
C132 87-010-260-080 CAP, ELECT 47-25V
C133 87-010-403-080 CAP, ELECT 3.3-50V
C151 87-010-196-080 CHIP CAPACITOR,0.1-25
C171 87-010-260-080 CAP, ELECT 47-25V
C172 87-010-260-080 CAP, ELECT 47-25V
C173 87-010-260-080 CAP, ELECT 47-25V
C174 87-010-260-080 CAP, ELECT 47-25V
C175 87-010-247-080 CAP, ELECT 100-50V
C176 87-010-263-080 CAP, ELECT 100-10V
C182 87-010-322-080 C-CAP,S 100P-50 J CH
C183 87-010-322-080 C-CAP,S 100P-50 J CH
C184 87-010-322-080 C-CAP,S 100P-50 J CH
C185 87-010-322-080 C-CAP,S 100P-50 J CH
C186 87-010-322-080 C-CAP,S 100P-50 J CH
C187 87-010-322-080 C-CAP,S 100P-50 J CH
C191 87-A10-479-080 CAP,CER 2200P-250 M E KH
C195 87-010-405-010 CAP, ELECT 10-50V
C281 87-010-401-080 CAP, ELECT 1-50V
C282 87-010-263-080 CAP, ELECT 100-10V
C283 87-010-380-080 CAP, ELECT 47-16V
C284 87-010-260-080 CAP, ELECT 47-25V
CN101 87-A60-813-010 CONN,8P H BLK TAC-L8X
CN102 87-A60-813-010 CONN,8P H BLK TAC-L8X
CN104 87-A60-770-010 CONN,18P B TMC-D(X)
CN203 87-A60-109-010 CONN,2P V S2M-2W
CN301 87-A60-778-010 CONN,18P B TMC-D(P)
CN302 87-A60-058-010 CONN,10P V 9604S-10C
CN305 8Z-CL1-665-010 CONN ASSY,5P FR
J201 87-A60-420-010 JACK,3.5 ST (MSC)
J202 87-099-801-010 JACK,PIN 1P BLK
J501 87-A60-782-010 CONN,19P H FG
W101 8Z-CL1-656-010 F-CABLE,7P 2.5 150MM PWR
W102 8Z-CL1-654-010 F-CABLE,2P 2.5 170MM SUBPT
W103 8Z-CL1-655-010 F-CABLE,4P 2.5 100MM PWR
WH102 87-A90-460-010 HLDR,WIRE 2.5-7P
FRONT C.B
C301 87-012-145-080 CAP, CHIP S 270P CH
C303 87-010-312-080 C-CAP,S 15P-50 CH
C304 87-015-785-080 CHIP CAPACITOR, 0.1FZ-25Z
C305 87-010-196-080 CHIP CAPACITOR,0.1-25
C341 87-010-493-080 CAP,E 0.47-50 GAS
C342 87-A10-189-040 CAP,E 220-10
C343 87-010-196-080 CHIP CAPACITOR,0.1-25
C347 87-010-405-080 CAP, ELECT 10-50V
C351 87-010-194-080 CAP, CHIP 0.047
C352 87-010-194-080 CAP, CHIP 0.047
C358 87-010-263-080 CAP, ELECT 100-10V
C371 87-010-404-080 CAP, ELECT 4.7-50V
C372 87-010-404-080 CAP, ELECT 4.7-50V
C373 87-010-408-080 CAP, ELECT 47-50V
FL301 8Z-CL1-630-010 FL,13-ST-36GNAK
HL301 8Z-CL1-204-010 HLDR,FL
L301 87-A50-052-010 COIL,CLOCK 5.76MHZ T1
LED361 87-A40-568-010 LED,L-13HD RED
POWER AMP C.B
C201 87-010-260-080 CAP, ELECT 47-25V
C202 87-010-260-080 CAP, ELECT 47-25V
C203 87-A10-946-080 C-CAP,S 220P-100 J CH
C204 87-A10-946-080 C-CAP,S 220P-100 J CH
C209 87-010-186-080 CAP,CHIP 4700P
C210 87-010-186-080 CAP,CHIP 4700P
C211 87-012-368-080 C-CAP,S 0.1-50 F
C212 87-012-368-080 C-CAP,S 0.1-50 F
C213 87-010-195-080 C-CAP,S 0.068-25 F
C214 87-010-195-080 C-CAP,S 0.068-25 F
C215 87-010-544-080 CAP, ELECT 0.1-50V
C216 87-010-544-080 CAP, ELECT 0.1-50V
C217 87-010-182-080 C-CAP,S 2200P-50 B
C218 87-010-182-080 C-CAP,S 2200P-50 B
C221 87-010-186-080 CAP,CHIP 4700P
C222 87-010-186-080 CAP,CHIP 4700P
C223 87-010-403-080 CAP, ELECT 3.3-50V
C224 87-010-403-080 CAP, ELECT 3.3-50V
C263 88-266-610-810 CAP,SC 1000P-25 K SR DD400
C264 88-266-610-810 CAP,SC 1000P-25 K SR DD400
C265 87-010-546-080 CAP, ELECT 0.33-50V
C266 87-010-546-080 CAP, ELECT 0.33-50V
C271 87-015-819-080 CAPACITOR,0.01

6
REF. NO PART NO. KANRI DESCRIPTION
NO.
REF. NO PART NO. KANRI DESCRIPTION
NO.
C277 87-010-197-080 CAP, CHIP 0.01 DM
CN201 87-A60-812-010 CONN,8P V BLK TAC-L8P
CN202 87-A60-812-010 CONN,8P V BLK TAC-L8P
J203 87-YP6-608-010 TERMINAL,SPKR 4P
L201 87-003-383-010 COIL,1UH-S
L202 87-003-383-010 COIL,1UH-S
R215 87-A00-258-080 RES,M/F 0.22-1W J
R216 87-A00-258-080 RES,M/F 0.22-1W J
R217 87-A00-258-080 RES,M/F 0.22-1W J
R218 87-A00-258-080 RES,M/F 0.22-1W J
R219 87-A00-258-080 RES,M/F 0.22-1W J
R220 87-A00-258-080 RES,M/F 0.22-1W J
TH201 87-A91-042-080 C-THMS,100K 55001
TH202 87-A91-042-080 C-THMS,100K 55001
MAIN PT C.B
! C191 87-A10-479-080 CAP,CER 2200P-250 M E KH
CNA107 8Z-CL1-657-010 CONN ASSY,7P 160MM PTPRI
! PR151 87-A90-094-080 PROTECTOR,4A 491SERIES 60V
! PT101 8Z-CL1-623-010 PT,E
! RY101 87-A91-281-010 RELAY,AC12V OSA-SS-202DM5
! T101 87-A60-317-010 TERMINAL, 1P MSC
! T102 87-A60-317-010 TERMINAL, 1P MSC
WH101 87-A90-460-010 HLDR,WIRE 2.5-7P
SUB PT C.B
CNA108 8Z-CL1-657-010 CONN ASSY,7P 160MM PTPRI
! PT102 8Z-CL1-674-010 PT,SUB ZCL-1(H)
! SW101 87-A90-234-010 SW,SL 1-2-2 SWS2201
TU INF C.B
CN114 87-099-570-010 CONN,13P TUC-P13P-B1
CN115 87-A60-114-010 CONN,4P H S2M-4WR
CN116 87-A60-077-010 CONN,10P H 9604S-10F
TUNER C.B
C701 87-010-381-080 CAP, ELECT 330-16V
C702 87-010-404-080 CAP, ELECT 4.7-50V
C703 87-012-286-080 CAP, U 0.01-25
C704 87-012-286-080 CAP, U 0.01-25
C705 87-A10-592-080 C-CAP,S 0.015-50 J B
C706 87-A10-592-080 C-CAP,S 0.015-50 J B
C709 87-012-195-080 C-CAP,U 100P-50CH
C711 87-010-260-080 CAP, ELECT 47-25V
C712 87-010-831-080 C-CAP,U,0.1-16F
C714 87-012-286-080 CAP, U 0.01-25
C717 87-012-286-080 CAP, U 0.01-25
C719 87-012-286-080 CAP, U 0.01-25
C720 87-012-195-080 C-CAP,U 100P-50CH
C721 87-012-176-080 CAP 15P
C722 87-012-176-080 CAP 15P
C723 87-012-274-080 CHIP CAP,U 1000P-50B
C725 87-012-274-080 CHIP CAP,U 1000P-50B
C727 87-010-196-080 CHIP CAPACITOR,0.1-25
C728 87-010-248-080 CAP, ELECT 220-10V
C729 87-012-274-080 CHIP CAP,U 1000P-50B
C731 87-012-286-080 CAP, U 0.01-25
C733 87-010-987-080 C-CAP,S 1500P-50 CH
C734 87-010-987-080 C-CAP,S 1500P-50 CH
C735 87-010-987-080 C-CAP,S 1500P-50 CH
C736 87-010-987-080 C-CAP,S 1500P-50 CH
C737 87-A10-592-080 C-CAP,S 0.015-50 J B
C738 87-A10-592-080 C-CAP,S 0.015-50 J B
C751 87-010-220-080 C-CAP,S 0.018-25 B
C752 87-010-220-080 C-CAP,S 0.018-25 B
C756 87-012-286-080 CAP, U 0.01-25
C757 87-012-188-080 C-CAP,U 47P-50 CH
C758 87-012-167-080 C-CAP,U 5P-50 CH
C763 87-010-829-080 CAP, U 0.047-16
C764 87-012-337-080 C-CAP,U 56P-50 CH
C765 87-012-286-080 CAP, U 0.01-25
C768 87-012-286-080 CAP, U 0.01-25
C769 87-010-260-080 CAP, ELECT 47-25V
C770 87-010-829-080 CAP, U 0.047-16
C771 87-010-383-080 CAP, ELECT 33-25V
C772 87-010-829-080 CAP, U 0.047-16
C773 87-010-196-080 CHIP CAPACITOR,0.1-25
C774 87-010-263-080 CAP, ELECT 100-10V
C775 87-010-404-080 CAP, ELECT 4.7-50V
C776 87-012-286-080 CAP, U 0.01-25
C777 87-010-400-080 CAP, ELECT 0.47-50V
C778 87-010-401-080 CAP, ELECT 1-50V
C779 87-010-401-080 CAP, ELECT 1-50V
C780 87-010-196-080 CHIP CAPACITOR,0.1-25
C781 87-010-405-080 CAP, ELECT 10-50V
C782 87-010-405-080 CAP, ELECT 10-50V
C783 87-012-286-080 CAP, U 0.01-25
C784 87-012-286-080 CAP, U 0.01-25
C785 87-010-401-080 CAP, ELECT 1-50V
C789 87-012-275-080 C-CAP,U 1200P-50 B
C790 87-012-275-080 C-CAP,U 1200P-50 B
C791 87-010-405-080 CAP, ELECT 10-50V
C793 87-012-273-080 C-CAP,U 820P-50 B
C794 87-010-406-080 CAP, ELECT 22-50
C795 87-010-596-080 CAP, S 0.047-16
C796 87-010-403-080 CAP, ELECT 3.3-50V
C799 87-010-829-080 CAP, U 0.047-16
C812 87-012-286-080 CAP, U 0.01-25
C820 87-010-260-080 CAP, ELECT 47-25V
C821 87-012-286-080 CAP, U 0.01-25
C822 87-012-286-080 CAP, U 0.01-25
C823 87-012-286-080 CAP, U 0.01-25
C828 87-010-196-080 CHIP CAPACITOR,0.1-25
C829 87-010-196-080 CHIP CAPACITOR,0.1-25
C959 87-010-196-080 CHIP CAPACITOR,0.1-25
C960 87-010-196-080 CHIP CAPACITOR,0.1-25
C961 87-012-174-080 CAP CHIP CERA SS 12P CHJ
C963 87-010-196-080 CHIP CAPACITOR,0.1-25
CF801 87-008-261-010 FILTER, SFE10.7MA5-A
CF802 87-008-261-010 FILTER, SFE10.7MA5-A
CN701 87-A60-700-010 CONN,13P H GRY TUC-P13X-C1
FFE801 A8-8ZA-190-030 8ZA-1 FEUNM
L771 87-A50-266-010 COIL,FM DET-2N(TOK)
L772 87-A91-110-010 FLTR,PCFJZH-450 (TOK)
L981 8Z-ZA1-664-010 COIL,AM PACK 4(TOK)
X721 87-A70-061-010 VIB,XTAL 4.500MHZ CSA-309

7
TRANSISTOR ILLUSTRATION
BCEECBECB BE
C
2SB1370
2SB1677
2SD2619
2SK2158
CC5551
CSD655
KTA1266
KTC3198
CSC4115 2SA1235
2SC2714
2SC3052
2SC3906
CMBT5401
CSD1306
RT1N141C
RT1N144C
RT1P141C
RT1P144C
GS
D
2SK543
SD
G
• Regarding connectors, they are not stocked as they are not the initial order items.
The connectors are available after they are supplied from connector manufacturers upon the order is received.
88
A
Resistor Code
Chip Resistor Part Coding
Figure
Value of resistor
Chip resistor
Wattage Type Tolerance
1/16W
1/10W
1/8W
1608
2125
3216
5%
5%
5%
CJ
CJ
CJ
Form LW t
1.6 0.8 0.45
2 1.25 0.45
3.2 1.6
108
118
128
: A
: A
CHIP RESISTOR PART CODE
0.55
Resistor Code
Dimensions (mm)
Symbol
1/16W 1005 5% CJ 1.0 0.5 0.35 104
Lt
W

8
ANODE CONNECTION
FL (13-ST-36GNAK) GRID ASSIGNMENT/ANODE CONNECTION
GRID ASSIGNMENT

12345678910 11 12 13 14
A
B
C
D
E
F
G
H
I
J
K
109
WIRING-1 (POWER AMP)
AC120/220-240V 50/60Hz
EZ
MODEL
EZ
MODEL
AC VOLTAGE
SW101
120 220-240V

1211
SCHEMATIC DIAGRAM-1 (POWER AMP)
AC VOLTAGE

12345678910 11 12 13 14
A
B
C
D
E
F
G
H
I
J
K
1413
WIRING-2 (FRONT)

1615
SCHEMATIC DIAGRAM-2 (FRONT)
IC301
LC866532A-5L31RX

12345678910 11 12 13 14
A
B
C
D
E
F
G
H
I
J
K
1817
WIRING-3 (TUNER)

2019
SCHEMATIC DIAGRAM-3 (TUNER)
TO/FROMTU INF C.B
CN114
:
:
L771
DC Balance/Mono Distortion ADJ
L772
AM IF ADJ
L981
AM Tracking ADJ
BAND
SW
IF AMP
FM/AM IF/STEREO
TUNER SYSTEM
TU+B
SW
TUNER C.B

21
ELECTRICAL ADJUSTMENT
12
3
L771 L772
TP1
5
L981
FFE801
TP2
R785
30
IC771
TP4 TP3
TP9 GND TP8
CN701
12 11 10
TUNER C.B
< TUNER SECTION >
1. DC Balance/Mono Distortion Adjustment
Settings: • Test point: TP3, TP4
• Adjustment location: L771
• Input level: 60dBµV
Method: Set to FM 98.0MHz and adjust L771 so that
the voltage between TP3 and TP4 becomes
0V±0.04V.
Next, check that the distortion is less than
1.3%.
2. AM IF Adjustment
Settings: • Test point: TP8, TP9
L772 ..............................................455kHz
3. AM Tracking Adjustment
Settings: • Test point: TP8, TP9
• Adjustment location: L981
Method: Set to AM 603kHz and adjust L981 so that the
test point becomes maximum.
4. AM VT Check
Settings: • Test point: TP1 (VT)
Method: Set to AM 1602kHz and check that the test
point is less than 8.0V.
Then set to AM 531kHz and check that the test
point is more than 0.6V.
5. Clock Frequency Check
Settings: • Test point: TP2 (CLK IC771 pin30)
Method: Set to AM 1602kHz and check that the test
point becomes 2052kHz±45Hz.
6. FM VT Check
Settings: • Test point: TP1 (VT)
Method: Set to FM 87.5MHz, 108.0MHz and check that
the test point is more than 0.5V (87.5MHz) and
less than 8.0V (108.0MHz).

22
PRACTICAL SERVICE FIGURE
< TUNER SECTION >
<FM SECTION>
IHF Sensitiviy: 4dB±6dB
(THD 3%) (at 87.5/98.0MHz)
5dB±6dB (at 108MHz)
Signal to noise ratio: More than 65dB
(at 98.0MHz)
Distortion: Less than 1.3%
(Input: 66dB) (at 98.0MHz)
Stereo separation: More than 30dB
(at 98.0MHz)
Intermediate frequency: 10.7MHz
<AM SECTION>
Sensitivity: 54dB±6dB (at 603kHz)
(S/N 20dB) 52dB±6dB
(at 999/1404kHz)
Signal to noise ratio: More than 34dB
(Input: 100dB) (at 999kHz)
Distortion: Less than 1.5%
(at 999kHz)
Intermediate frequency: 450kHz

23
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20-22
23
24-26
27
28
29
30-41
42, 43
44
45
46
47-50
51
52-71
72
73-80
81
82-84
85, 86
87
88
89
IC, LC866532A-5L31RX
Pin No. Pin Name I/O Description
IC DESCRIPTION
________________
I-MACMD
O-SCMD
1-RDSDATA
___________
O-PAMP
P32
O-CLK
O-DATA
P35
O-P.ON
P37
_____________
O-CKSFT
________
RST
________________
I-STEREO
I-TUDO
VSS1
CF1
CF2
VDD1
____________
I-HOLD
P81-P83
I-TU-SIG
P85-P87
I-RDSCLK
I-TMBASE
P73
G13-G2
P35, P34
G1
P33
VDD3
P32-P29
VP
P28-P9
VDD4
P8-P1
S48
PG1-PG3
P00, P01
O-CE
O-TUON
VSS2
I
O
I
O
—
O
O
—
O
—
O
I
I
I
—
I
O
—
I
—
I
—
I
I
—
O
O
O
O
—
O
—
O
—
O
—
—
—
O
O
—
Command input from master microprocessor.
Serial data output to master microprocessor.
RDS data input.
Power supply control output (power supply ON/OFF of POWER AMP).
NC.
Connected to TUNER PLL IC LC72131 pin-5CL.
Connected to TUNER PLL IC LC72131 pin-4DI.
NC.
Power save mode control output
NC.
Clock shift output. “L” at clock shift.
Microprocessor reset.
TUNER, STEREO detection.
Connected to TUNER PLL IC LC72131 pin-6D0.
GND.
5.76 MHz. Connected to oscillator.
Microprocessor power supply (µ-com 5V).
Hold state detection. (Ignored by slave microprocessor)
NC.
RDS signal level AD value input (A/D).
NC.
RDS CLK input.
Reference clock input for watch. Connected to PLL ICLC72131 pin-7.
NC.
FL tube grid output. (13G-2G).
FL tube anode output. (P35, P34).
FL tube grid output. (1G).
FL tube anode output. (P33).
Microprocessor power supply. (µ-com 5V).
FL tube anode output. (P32-P29).
Connected to minus power supply -VFL for FL.
FL tube anode output. (P28-P9).
Microprocessor power supply. (µ-com 5V).
FL tube anode output. (P8-P1).
NC.
Connected to TUNER PLL IC LC72131pin-3CE.
TUNER power supply. ON/OFF output.
GND.

24
Pin No. Pin Name I/O Description
90
91, 92
93
94
95-97
98
99
100
VDD2
P04, P05
O-MUTE
P07
P10-12
O-MASI
____________
I-MASO
I-MACLK
—
—
O
—
—
O
I
I
Microprocessor power supply. (µ-com 5V).
NC.
Main mute output.
NC.
Serial data output to master microprocessor.
Serial data input from master microprocessor.
Transfer clock input from master microprocessor.

25
IC BLOCK DIAGRAM
IC, BU1920FS
IC, LA1837
IC, LC72131

26
MECHANICAL EXPLODED VIEW 1/1
1
2
3
F
E
F
EA
45
FL
P.C.B A
6
B
B
C
C
B
G
AB
B
C
B
H
H
I
J
A
G
G
P.C.B
P.C.B
P.C.B
P.C.B
7
14
8
18
19
15
16
17
13
HT-SINK,SUB
HT-SINK,MAIN ASSY
11
10
9
P.C.B
P.C.B
CHAS,MAIN
SHLD-PLATE
SUB.PT
SHLD-PLATE PT 12
21
20
22
HLDR,IC