Nakamichi IA-2 User manual

Service Manual
IA-2
Integrated Amplifier
T BNakamichi

CONTENTS
a i?) @
3 ry
2.2. Front Panel Ass'y (A01) .0...... eee ceeeeeeteeeseeenees
2.3. Front Chassis Ass'y (A02) ............ cc ccccsseccsseeeeeseee
2.4. Heat Sink Ass'y (A038) ue cesereesceeeeteeenees
3. Mounting Diagrams and Parts List................ccsesssescees
3.1. Volume LED P.C.B. ASS'Y 200.0... ees eeeesteceteeeeneees
3.2. Sensor P.C.B. ASS'Y ..... ccc ccecseeesseecereesseeteeeee
3.3. Front P.C.B. ASS'Y ...........ccssccsseesertecssecssscessseees
4. Schematic Diagram ............scccsssescsesresssscesenccesrensereceesse
1. GENERAL
Reference
Service
Manual
The
base
Model
of
IA-2
is
Amplifier
2.
In
this
Service
Manual,
identical
sections/items
are
omitted.
So,
please
refer
to
the
Service Manual of Amplifier 2 (0Q06142A).
2. Mechanism Ass’y and Parts List ...........--.s:ccsccssessescees
D2: 15 (SYMBOSIS 5. ceifscccctssecccie sees ceceenestbiccencieanaacbesesens
1.1. Product Code
B115
1.2. Destinations
EP, UK, SWT, GER, AUS, SAU, OTR, JPN
Abbreviation
EP — Europe AUS — Australia
UK — United Kingdom SAU — Saudi Arabia
SWT — Switzerland OTR — Other
GER — Germany JPN — Japan
1.3. Cautions/Warnings
(1) Product Safety Notice A
Parts marked with the symbol in the schematic
diagram have critical characteristics.
Use ONLY replacement parts recommended by the manu-
facturer. It is recommended that the unit be operated from a
suitable DC supply or batteries during initial check-out pro-
cedures.
(2) Leakage Current Check/Resistance Check
Before returning the unit to the customer, make sure you
make either (1) a leakage current check or (2) a line to
chassis resistance check. If the leakage current exceeds
0.5 milliamp, or if the resistance from chassis to either side
of the power cord is less than 240 k ohms, the unit is defec-
tive.
WARNING — DO NOT return the unit to the customer until
the problem is located and corrected.
1.4. Voltage Selector
Voltage Selector is installed on the Rear Panel of the
IA-2 (SAU and OTR). The voltage selector can select
either 110V—120V or 220V—240V at customer's disposal.

1.5.
Package
Ass'y
and
Accessory
Ass'y
Schematic
Ref. No.
01
02
Part No. Description
Package Ass'y
0F04469B Packing
0F04752A Carton Box
0F04458A_ Soft Sheet
Fig. 1
Schematic
Ref. No.
Part No.
DA04728A
DA04731A
DA04733A
DA04730A
DA04729A
OB90451A
0D06457A
OD06459A
OD06460A
0D06458A
DA04734A
0D06136A
Description
Accessory Ass'y (EP, SWT, GER)
Accessory Ass'y (UK)
Accessory Ass'y (SAU)
Accessory Ass'y (AUS, OTR)
Accessory Ass'y (JPN)
Battery UM3x1
Owner's Manual (English)
Owner's Manual (German)
Owner's Manual (French)
Owner's Manual (Japanese)
Remote Contro! Unit
Mini Plug Cord
oy
hh eh hk ek
~Am-a oa ap

2. MECHANISM ASS'Y AND PARTS LIST
2.1. Synthesis
a

2.1. Synthesis
Schematic
Ref. No.
01
02
03
04
05
06
08
10
11
12
14
16
16
17
18
19
20
21
22
23
24
25
26
27
28
30
L01
Lo2
LOS
L04
LO5
LO6
L07
Los
Part No.
OHO5862A
0B50188A
0B50223A
0B50233A
0B50189B
0B50187A
BA08075A
BA08074A
HAO6664A
HAO6654A
OHO06418A
OHO6656A
HAO06655A
HAO6656A
0J07146A
HAO6653A
BAO8955A
0H06472A
BA08077A
BA08076A
BA08073A
BA08072A
0B08093U
0B08348A
0B05241A
0B80336A
0B90280A
OHO6626A
OHO6627A
OHO6630A
OHO6631A
OH06632A
OHO6629A
O0B90385A
0B90384A
BA08071A
BA08070A
0B80394A
0B81986A
0890385A
OB90380A
BAO8069A
0B70210A
0B70049A
BA08062A
BA08079A
BA08078A
0B81604A
0E03032A
0E00921A
0E03664A
0E03157A
0E03025A
OE00868A
0E03749A
OE00985A
0J06377A
Description
Synthesis
Top Cover
Power Transformer (EP, UK, SWT,
AUS)
Power Transformer (GER)
Power Transformer (SAU)
Power Transformer (OTR)
Power Transformer (JPN)
Power Supply P.C.B. Ass'y
(EP, UK, SWT, GER)
Power Supply P.C.B. Ass'y
(AUS, SAU, OTR, JPN)
Heat Sink Ass'y
Front Panel Ass'y
Front Chassis Ass'y
Selector Knob Ass'y
Power Switch Knob
Push Knob
Tone Knob Ass'y
Rec. Out Knob Ass'y
Power Joint
Volume Knob Ass'y
Volume LED P.C.B. Ass'y
Leg
Selector P.C.B. Ass'y
(EP, UK, SWT, GER)
Selector P.C.B. Ass'y (AUS, SAU,
OTR, JPN)
Eq. Amp. P.C.B. Ass'y (EP, UK, SWT,
GER)
Eq. Amp. P.C.B. Ass'y (AUS, SAU,
OTR, JPN)
Power Cord (EP, SWT, GER)
Power Cord (UK)
Power Cord (AUS)
Power Cord (SAU, OTR, JPN)
Cord Bushing
Rear Panel (EP)
Rear Panel (UK)
Rear Panel (GER)
Rear Panel (AUS)
Rear Panel (SAU)
Rear Panel (OTR)
Fuse T2.5A 250V [F401]
(EP, UK, SWT, GER)
Fuse T2.0A 250V [F402]
(EP, UK, SWT, GER)
AC Outlet B P.C.B. Ass'y
(EP, SWT, GER)
AC Outlet B P.C.B. Ass'y (UK)
AC Outlet (AUS)
AC Outlet 2P (SAU, OTR, JPN)
Fuse T2.5A 250V [F401] (AUS)
Fuse 5A 125V [F401]
(SAU, OTR, JPN)
AC Outlet A P.C.B. Ass'y
(SAU, OTR, JPN)
Voltage Selector (SAU)
Voltage Selector (OTR)
Remote P.C.B. Ass'y
Speaker Terminal P.C.B. Ass'y
(EP, UK, SWT, GER)
Speaker Terminal P.C.B. Ass'y
(AUS, SAU, OTR, JPN)
Earth Terminal
BT4x8 + Pan Washer Faced
(Black Chromate)
BT3x8 + Binding (Black Chromate)
ST4x8 + Tapping
(Black Chromate)
BT3x8 + Binding with Flat Washer
BT3x6 + Countersunk
BT3x8 + Binding
PT3x8 + Binding (Black Chromate)
M3x6 + Binding (Biack Chromate}
Speaker Terminal Cap (EP, UK, GER)
Oly
hk eh ak ot aoe
HARonwe a WWoenansn
+_— fe met
re ee eee ae ee ee ee eee
~_ ot
= at oe
ek ek ot
oo

2.2. Front Panel Assy (A01)
2.2. Front Panel Ass‘y (A02)
Schematic
Ref. No.
A01
01
02
03
04
05
06
07
08
Part No.
HAO6664A
OHO6633A
OQHOS860A
0J07142B
0H06621B
OHOSS61A
HAO6ES6C
O0HO6620B
OHOS858A
Description
Front Pane! Ass'y
Front Panel
Power indicator Lens
Center Escutcheon
SelectorLens -
—- wor Qn —
08

2.3.
Front
Chassis
Ass'y
(A02)
Fig. 2.3
2.3. Front Chassis Ass‘y (A02)
Schematic
Ref. No. Part No. Description Q'ty
A02 - Front Chassis Ass'y 1
01 BA08061A Power Switch P.C.B. Ass'y 1
(EP, UK, SWT, GER)
BAO8060A Power Switch P.C.B. Ass'y (AUS, 1
SAU, OTR, JPN)
02 BA08057A Headphone P.C.B. Ass'y 1
03 BA08946A Front P.C.B. Ass'y (EP, UK, SWT, 1
GER)
BA08947A Front P.C.B. Ass'y (AUS, SAU, 1
OTR, JPN)
04 BA08064A Speaker Switch P.C.B. Ass’y 1
05 BAO8065A Volume B P.C.B. Ass'y 1
06 BAO8950A Sensor P.C.B. Ass'y 1
L01 OEO0606A M3x6 + Pan (3A)
L02 QE00896A M3x6 + Binding
L03 0&00877A ST3x5 + Binding

2.4. Heat Sink Ass'y (A03)
Fig. 2.4
2.4. Heat Sink Ass'y (A03)
Schematic
Ref. No.
A03
01
02
03
04
05
06
07
08
L01
L02
LO3
Part No.
0J06294A
0B10290A
0B10381A
0B10291A
BA08948A
BA08949A
OB80356A
OB80355A
0B80357A
0£03319A
OE00868A
0E03157A
Description
Heat Sink Ass'y
Transistor Sheet
TR 2SA1491 [Q182L,R]
TR 28C3421 [Q176L,A]
TR 2SC3855 {Q181L,R]
Power Amp. P.C.B. Ass'y
(EP, UK, SWT, GER)
Power Amp. P.C.B. Ass'y
(AUS, SAU, OTR, JPN)
Connector Ass'y 4P {CN118]
Connector Ass'y 2P [(CN116]
Connector Ass'y 2P [CN121]}
M3x8 + Binding
BT3x8 + Binding
BT3x8 + Binding With Flat Washer
= —~NMNNA
=

3. MOUNTING DIAGRAMS AND PARTS LIST
3.1.
Volume
LED
P.C.B.
Ass'y
3.2.
Sensor
P.C.B.
Ass’y
3.3. Front P.C.B. Ass'y
ora
hier.
Grace
23800a0
AF 88S
FRONT PCB
Fig. 3.3

NOTES: 1. Abbreviations
TR — Transistor, SID — Silicon Diode, ZD — Zener Diode, Varicap — Variable Capacitance Diode
RK — Carbon Resistor, RM — Metal Film Resistor, RF — Fail Safe Type Resistor, RC - Cement Resistor
CE — Electrolytic Capacitor, CML - Mylar Capacitor, CC - Ceramic Capacitor, CPP — PP Capacitor,
CMM -— Metalized Mylar Capacitor, CSP — Polystyrene Capacitor, C - Mica Capacitor,
CT — Tantalum Capacitor
2. Description of capacitor: 10 16V = 10p 16V
3.1. Volume LED P.C.B. Ass'y
Schematic
Ref. No. Part No. Description
BA08955A Volume LED P.C.B
Ass'y
OB60892E Volume LED P.C.B.
ED611 0C85387A LED SLR-34D0C3F
CN108 0B80345A 2P Connector Ass'y
3.2. Sensor P.C.B. Ass'y
Schematic
Ref. No. Part No. Description
BAO08950A Sensor P.C.B. Ass'y
0B60873F Sensor P.C.B.
ED610 0C85387A LED SLR-34DC3F
R631 OB09661A RK 220 1/6WJ
R632 0B09637A RK 22 T/6W J
R633 OBO9709A RK 22K 1/6WJ
C608 0B40176A CE 4.750V
M601 0B19017A Remote Receiver Unit
$107 0B70161A Tact Switch
CN112 0B81637A 5P T-Post
3.3. Front P.C.B. Ass'y
Schematic
Ref. No. Part No. Description
BAO8946A Front P.C.B. Ass'y
(EP, UK, GER)
BA08947A Front P.C.B. Ass'y
(AUS, SAU, OTR, JPN)
OB6086SF Front P.C.B.
0J06295A LED Reflector
U601 0B11888A IC uPD75104CW
U602 0B11530A IC BA6208
Q141LR 0B10078A TR 2SC2240 (GR)
Q142L.R 0B10078A TR 2SC2240 (GR)
Q143LR 0B10078A TR 2SC2240 (GR)
Q144L,R 0B06180A TR 2SA970 (GR)
Q145LR 0B10078A TR 2SC2240 (GR)
Qi46LR 0B10078A TR 2SC2240 (GR)
Q147LR 0B06180A TR 2SA970 (GR)
Q461 0B06322A TR 2SC2002 {K,L)
Q462 0B06372A TR 2SA953 (K,L)
Q463 0B06155A TR 2SA733
Q464 OB06100A TR 2SC945
Q601 0B10062A TR DTC144ES
Q603 0B10058A TR DTAi44ES
Q604,605 0B10062A TR DTCi44ES
Q606 0B10070A TR DTC143ES
Q608,609 0B10053A TR DTA144ES
Q610,611 OB06299A TR 2SC2878
Q612,613 OB06299A TR 2SC2878
ZD41LR 0B12360A ZD 2.7VB2
20424 0B12195A ZD 24V B2
ED601,603 0C85387A LED SLR-34DC3F
Schematic
Ref. No.
ED604,605
ED605,606
ED607,608
D141L,R
D601
D602
D604,605
D607
X601
L601
VR101
VR104,105
RA601
R141L,R
R142L,R
R143L,R
R144L,R
R145L,R
R146L,R
R147L,R
R148L,R
R149L,R
R150L,R
R151L,R
R152L,R
R153L,R
R154L,R
R155L,R
R156L,R
R157L,R
Ri58L,R
R159L,R
R160L,R
R16iL,R
Ri62L,R
R163L,R
R164L,R
RI165L,R
R166L,R
R167L,R
R168L,R
R169L,R
R170L,R
R463,464
R465,466
R467 468
R469,470
R601,602
R604,605
R606
R607,608
R610,611
R612,613
R614,615
R616,617
R618
C141L,R
C142L,R
C143L,.R
C144L,R
Part No. Description
0C85387A LED SLR-34DC3F
0C85387A LED SLR-34DC3F
0C85387A LED SLR-34DC3F
OB06398A SID 1SS176
0B12693A SID S5688B
OB06398A SID 1SS176
9B80082A Jumper Wire
(EP, UK, GER)
0B12693A SID S5688B
(AUS, SAU, OTR, JPN)
OB06398A SID 188176
0B92043A_ X'tal 4.19MHz
0B51378W Inductor 68uH
0B30139A VR 250 KMN
0B30140A VR 100KC
0B21103A R Network 47Kx15
OB01679A RK 100 1/4WJ
0B01684A RK 470K 1/4W J
O0B01846A RK 4.7K 1/4WJ
OB01846A RK 4.7K 1/4WJ
QB01706A RK 47 1/4W J
OB01706A RK 47 1/4W J
OB05614A RK 18K 1/4WJ
OBO5560A RK 18K 1/4WJ
OB05575A RK 560 1/4WJ
0B01933A RK 220 1/4WJ
OBO5575A RK 560 1/4WJ
OB01706A RK 47 V/AW J
0B01706A RK 47 1/4W J
0B01857A RK 1.0K 1/4WJ
OBOS5508A RK S6K 1/4WJ
OB05784A RK 560K 1/4WJ
0B01857A RK 1.0K 1/4WJ
OB01854A RK 39K 1/4WJ
OB01854A RAK 39K 1/4WJ
OB09075A RK 30K 1/4WJ
OB05641A RK 47K 1/4WJ
OBO9696A RK 6.2K 1/6WJ
OBOS698A RK 1.5K 1/4WJ
0B01857A RK 1.0K 1/4WJ
OB01888A RK 10K 1/4WJ
OBO1856A RK 8.2K 1/4WJ
OB09882A RK 620 1/4WJ
OB20083A RK 1.5M 1/6WJ
OBOS716A RK 43K 1/6WJ
OBO5641A RK 47K 1/4WJ
OBOS685A RK 2.2K 1/6WJ
OB09685A RK 2.2K 1/6WJ
OBO9685A RK 2.2K 1/6WJ
0B24279ARF 470 1W
0B09717A RK 47K 1/6WJ
OBO9661A RK 220 1/6WJ
0B09701A RK 10K 1/6WJ
0B09717A RK 47K 1/6WJ
QB0S701A RK 10K 1/6WJ
OB09701A RK 10K 1/6WJ
OB09653A RK 100 1/6WJ
OB09725A RK 100K 1/6WJ
OB09661A RK 220 1/6WJ
0B47113A CC 330P 50V K
0B40777A CE 0.47 50V
0B41976A CC 33P 50VJ
0B40784A CE 4.750V
Schematic
Ref. No.
C145L,R
C146L,R
C147L,R
C148L,R
C149L,R
C150L,R
C151L,R
C152L,R
C461 462
C463,464
C601
C602
C603
C604
C605
C607
$103
$104
$105
CN102
CN104
CN107
CN109
CN110
CN111
CN112
CN113
CN114
CN115
M101
JP601
Part No.
0B41974A
0B40784A
0B09045A
0B41306A
0B05687A
OB05582A
0B05582A
O0B05582A
0B40557A
0B40784A
0B41554A
0B47117A
0B40786A
0B41554A
0B40158A
0B40501A
0B70186A
0B70191A
0B70196A
0B80337C
0B80338B
0B80369B
0B80346A
0B80353A
0880363A
0B80347A
0B80348B
0B80361A
0B80352B
0B90429A
OB80395A
0B84386A
0B84385A
0B84387A
0B84383A
0B80379B
O0J06295A
0B84395A
Description
CC 100P 50V J
CE 4.750V
CML 0.027 50V J
CML 0.47 50V J
CML 1200P 50V J
CML 0.022 50V J
CML 0.022 50V J
CML 0.022 50V J
CE 150V
CE 4.750V
CC 0.022 25V Z
cc 0.1 50VK
CE 33063V
CC 0.022 25V Z
CE 1006.3V
CE 0.15.5V
Rotary Switch
1-12NS
Rotary Switch 1-7NS
Push Switch
3P Connector Ass'y
5P Connector Ass'y
4P Connector Ass'y
7P Connector Ass'y
4P Connector Ass'y
4P Connector Ass'y
5P Connector Ass'y
3P Connector Ass'y
3P Connector Ass'y
4P Connector Ass'y
C. Clip (5)
Ground 8 Ass'y
6P Wire Holder (CN 107)
5P Wire Holder
(CN104/CN111/CN1 12)
7P Wire Holder
(CN109)
3P Wire Holder
(CN113/CN114)
Ground 7 Ass'y (1)
LED Reflector (6)
LED Spacer

4.
SCHEMATIC
DIAGRAM
M601
[ TAPE 1
SYSTEM
REMOTE TAPE
OUTPUT
| L
TUNER
REMOTE P.C.B
SENSOR P.C.B.
REMOTE SENSOR
VOLUME B P.C.B
CN-107
fs }ve up
{2} VR DOWN
7
13}
+5.6V
4]
GND
cN-108
rh}
i
'
\
'
1
4
VOLUME (“5
MOTOR
RE42
CN~109
!
t
| | Loureur even
FRONT P.C.B.
cN~102
FROM OUTPUT L
SELECTOR @wD
P.c.B. ourput e
TO/FROM
SELECTOR
P.C.B.
TO POWER
AMP P.C.B.
AUDIO MUTE
poweR
S107 SUPPLY
Saget P.c.B.
mex
838 R632 CN-112
22 +5V
A— rs20
PJ601 22
D621
BY R624 10K
2—| \—res
10K }ag22 10K
PUEO2 22
A— Re30
PUbO3 22
VOLUME LED P.C.B. :
D611
N-109
TONE IN LCH £
VRIO1
vA 250K MN
pe 4
BALANCE
Q603
DTAII4ES
e0601 iba 1
4 0607 220
24V
c145l fu oor
R42L 470K
ci46t
+7/50V
56K 4
RISSL
RISSR C146R
UbO1 UPD7S5104CW
13
2 to)
HA
BFR
ACE Ecs
si RS1
so RS2
cl RS3
PIN xt
PAL x2
cL
R6EO6 10K
CbO1 0.022
(SYSTEM CONTROL MPU)
brerp bt
(PRE AMP)
O146L
2S8C2240 (GR)
C144L
4.7/50V
RAsO1
47Kx15 4
)
Pty
Wa] |
y
Ri54L
1K
Q606
OTC143ES
r-=
1)
Lle=
(TONE CONTROL)
R616 100K
V602 BAS208
i je'9
(VOLUME MOTOR DRIVER)
fepeee fern ases 34V
SUPPLY
28c2002
ates
CN-114
+42V FROM
GND POWER SUPPLY
~42V P.C.B.
610
K
|
ay
2sc2878 seesere
e464
ey 280945
r 7
Pay 0.6V
on
= reas |
x
PI
on
an
eo R470
0462 470 1W
250953 \| -24.6V
~34V
24V
R617 100K
CN-115
J
LeH
oUT
ee ETA CTD TAL owen Aur
tS RCH our ree
B 7 me
© GND
24V
Q611
25¢2678 == acs
3 1 DTA144ES
aml
-—71 608
C3 4 DTAI44ES
aad
1
$103
old
o O
ee ee el
‘
aa |
5.0V
L601
6euH
-
a
Pe
Su
ws
$3
S
CN-107
GND
+5.6V
VOL . DOWN
VoL. UP
D601
sseee

Service Manual
Nakamichi
Anmolifier
1

CONTENTS
Ts: (Getieralss 3h 635 ee fi es ee he eh aha patie eee esa ee ote Oks Sia) sha oie BO a 6 Le eb ed Seago eee te 8S 1
2. Removal Procedures .........0 0000s evecceeaae ep die GAM edna tarp ta ew tea Sieh co BER eee Seve a ded Baba bc ee 3
2... ok, Top COVERS «ices sfeicelt aia ya tng ae be acter RS faye ecst B ok le ee Botta ar Be Oe Ode dela, Beta oie ard dea ood otras 8 3
2. 2. Bottom: Cover. Ass’y. 6.5. gc whee ek ah rete ge ce ese et oD Be a WSS 2 ne Wea aden aes Suk: See ees 3
2. 3. Pront:Pariel Aggy 205 s5 ise cite cide sn tee ire ret id ack GN Boobs, SESE, aslo lay foie te al vas 8 BRYON -calplce Gor ce We wiceus. @ uk eS 3
3. Parts Location for Electrical Adjustment... . 0.0... ee ee tee ete ee teen ens 4
4., ~ Electrical Adjustment: ooo isde: 22s ane aw acetinndiee deeb al eee, os Se Slee eens, 88, Ble eee dae Spy er wales Sere eal ate 4
5. Mechanism Ass’y and Parts List... 0... 0... fe ee ee ete ee ee ee ee eee ee ee ees 5
5. 1. Synthesis > <2 <co:e-cGf fog on bab te tats eats ceeds ws eae, Cee Lan at arta nang Haile arate: yaa ce oat Add eee Sesees az 5
5. 2. Front‘Panel :Ass’y' (AOD). ice. o.c-o.6 ste seven eee aol baa ky of gh We ws ace Bae a oa 0G J Gees 7
5. 3. Front Chassis: Assy. (A022) ecicoco-5:o ectin bdo Wb hte es be BS He anne tele ee Se os BOLO gi a ea eee wD eeaae 7
5 4, Heat: Sink Assy cco etec Ss eersee Merge eS Whig ol Bes Baga e teed a0 lore, Nya iat alte ecebe Si Meer gate ayes EM ss 8
6. Mounting Diagrams and Parts List .........0 2.0... cece cee eee ee eee eee eee eee eee 9
6. 1. AC. Outlet P:C:B:-Ass’y- cence pies nae Pep ee rd Sls aes eee 8: Sh eta aided! Soa etree navieneel oh 9
6. 2 Power Switch:P:C. Bi Ass ty jas eee lok Aw he a a asia nies Be pes hed aie a be Aug ena Ses 9
6. 3 Volume LED P.C.B:.Ass’y oon. 68S bh ee tee ea ees ee ew ge baa Da Sw ea eee 9
6. 4 Headphone P.C:BisAss?y s. .cs./o05:euce. 8 tek aie deed ce, deyilca 56) 5 fat ar earte EETES eee Soba Wo RE Ba bead 9
6. 5. Speaker Switch: P:C:B. Assy. 6c. 5.5055 Sa Ke ae se 8. Seed cone es acters eebuiws Se bi tectece Be Miedo, Sei er gua ene ves 10
6. 6. Remote-P:C:B:2Ass¥ 5 oie sec leek sore cade Sees Ws Bie Mela Bah Ss Pete Cle ass Be BARES a Reed arins ate Soh gear gansta) 10
6. 7 Sensor: P.C.B. Ass. xicesecc ja re, tied we he etece eh Me, Red SDS wd an ial wade lees acer sathe | Sua a Levarecarte aban we SEES 10
6. 8 Volume:A'P.C:BiASe? 9) os oo ccd eedbive bods, Subcdicd es odie le Saale Oe tee Ba 84 eo ain eee 10
6. 9. Speaker Terminal P.C.B. Ass’y 2... 0... 2. ccc ce cee ee ee et eee eet eee een tenes 10
6. 10. Power Supply P.C.B. Ass’y .. 0... ccc ee ee ee tee eee ee eee eee et eee eee 11
6. 11. Eq@.:Amps PC. Bi Ass ye: osecs itso tote dusk ole SERIR acct Shia We tirsne asta SE eS Sin: Wide Sea yeice a Be va, Sree oh 12
6. 12. Selector: PC: Be Ass’) 3 Ssaind cthse ite teva Betcdare. wcabess BAe Viglelat ene Gl Seek Meee & aa eee ere Calan ele 13
6. 13. Power Amp,.P:C.B: Assy 5:56 sete ratte eelec dre ar a care ey Wig Beta asia eal toca a Ree einen b) Sea Laher BTR, apse is, ie 14
6. 14. Front PC: B Ass ty «<<. se5 see sie ee Se Ss he eran ete a wee eS Oia Berea eee ee! Sr a edad wl else 15
7, “Schematic Diagrams «052%: 6.5soj6 5 ce escae elec ia ego a Se Sire oS a ale oe oa Fe SMe lee Sw ale Lea ol Bars Ta Rat Io eae 16
7 1. IC: Block: ‘Didgraiis. 0522. sda ek ees ere ooh Shsara ls Sb even Sle Bitar ey ALE EASE OE We oe Burdon ONE eee) as 16
7. 2. Schematic: Diagrams: oc. tsnk. 3) Soleo eave Beco oe ea ae eee eles Rs tah gg oie Sal 20
S.. Wiring Diagram: osc6 bce do seca ta alee Brae ad Has fale: BS! alee ec ee a a See ESA tye EN ake age 23
9... “Block: Diagram: ico oes Ra. 208 SiS ES a aah e BER SE GORD paras io atin ae Sao gts, WAS SS. ele ws Ee! fe ra Sih eet 24
10%» Specifications: 2/6 260%. ec dice-evlae eet ied Sha Ja oe pos RUN eg gee a ESE ae wore cd: Bk BP Wear ma be orators “late ad alts, 25
1. GENERAL
1.1.
Production
No.
1.4.
CAUTIONS/WARNINGS
Production
No.:
B109
(1)
Product
Safety
Notice
Parts
marked
with
the
symbol
Jv
in
the
schematic
1.2.
Destinations
diagram
have
critical
characteristics.
EP,
UK,
SWT,
GER,
AUS,
OTR,
JPN
Use
ONLY
replacement
parts
recommended
by
the
manufacturer.
Abbreviation
It
is
recommended
that
‘the
unit
be
operated
from
a
EP
-—
Europe
AUS
—
Australia
suitable
DC
supply
or
batteries
during
initial
check-out
UK
— United
Kingdom
OTR
—
Other
procedures.
SWT
—
Switzerland
JPN
— Japan
GER
—
Germany
(2)
Leakage
Current
Check/Resistance
Check
Before
returning
the
unit
to the
customer,
make
sure
you
1.3.
Parts
Supply
make
either
(1)
a
leakage
current
check
or
(2)
a
line
to
(1)
Unstocked
Parts
classis
resistance
check.
If
the
leakage
current
exceeds
0.5
Parts
marked
with
“*”
at
the
head
of
part
No.
are
not
milliamp,
or
if
the
resistance
from
chassis
to
either
side
of
stocked.
So,
it
takes
time
to
supply
the
parts
after
we
the
power
cord
is
less
than
240
k
ohms,
the
unit
is
receive
your
order.
defective.
.
WARNING
—
DO
NOT
return
the
unit
to
the
customer
(2)
Unsupplied
Parts
until
the
problem
is
located
and
corrected.
Parts
without
part
Nos.
(indicated
as
‘‘—’’
in
the
parts
list)
are
not
supplied.
1.5.
Voltage
Selector
Voltage selector is installed on the Rear Panel of the
Amplifier 2 (Other). The voltage selector can select 110 V,
120 V, 220 V, or 240 V at customer’s disposal.

1.6. Package Ass’y and Accessory Ass*y
Schematic
Ref, No,
Description
Fig. 1
Schematic
Ref. No.
Part No.
Description
OF04469A
OF04471A
Packing
Package Ass’y
Carton Box
DA04422A
DA04443A
DA04437A
DA04423A
0B90451A
0D06141A
0D06140A
DA04428A
0D06136A
Accessory
Ass’y
(EP,
SWT,
GER,
AUS)
Accessory Ass*’y (UK)
Accessory Ass’y (OTR)
Accessory Ass’y (JPN)
Battery UM3x1
Owner’s
Manual
(English/German
/French)
Owner’s Manual (Japanese)
Remote Contro] Unit
Mini Plug Cord
BRE BN BHR

2. REMOVAL PROCEDURES
2.1. Top Cover
Refer to Fig. 2.1.
(1) Loosen screws FO1 (4 pes.) and FO2 (3 pes.), and remove
F03 (Top Cover).
FO
FO3
f| Top Cover
Front View
Fig. 2.1
2.2. Bottom Cover Ass’y
Refer to Fig.2.2.
(1) Loosen screws FO1 (12 pcs.) and remove F02 (Bottom Cover
Ass’y).
Power Supply
PC.B. Assy
Power Amp.
PC.B. Assy
FO
Ress)
a Foi
FO!
Fo2 SNe
Bottom Cover Ass’y
Bottom View
Fig. 2.2
2.3. Front Panel Ass’y
Refer to Fig, 2.3.
(1) Remove the Top Cover referring to item 2.1.
(2) Peel off FO1 (Top Cover Cushion).
(8) Loosen screws FO2 (2 pes.) and FO3 (3 pes.), and remove
F04 (Front Panel Ass’y).
Front View
Fig. 2.3

3.
4,
4.1,
PARTS
LOCATION
FOR
ELECTRICAL
ADJUSTMENT
VRTIR
Idling Currant {Reh)
Power Amp.
P.C.B. Assy
Idling Current {L¢ch)
VRTIL
Fig. 3
ELECTRICAL ADJUSTMENT
Idling Current Adjustment
@ Measuring Condition
q1)
(2)
(3)
(4)
()
Red. Out Selector: CD Position
CD Input Jacks: Short with shorting pins,
Speaker Output Terminals: Unloaded
Turn OFF the power,
Turn
VR71L
(VR71R)
on
the
Power
Amp.
P.C.B.
Ass’y
fully
counterclockwise,
Connect
a
DC
millivoltmeter
between
both
pins
of
TP1(TP2).
Turn
ON
the
power.
Rotate
VR71L
(VR71R)
slowly
and
adjust
so
that
the
DC
millivoltmeter
reads
2.5
mV
to
3.5
mV
(idling
current
11
mA
to
16
mA).
|
|

MECHANISM ASS’Y AND PARTS LIST
5.
[Australia
20,
5.1. Synthesis
LO3
LO4
sy
1
Front Chassis As
Fig. 5.1

*: Unstocked parts.
Schematic
Ref.
No.
Description
5.1. Synthesis
- Synthesis
OH05862A |Top Cover
0B50185A_ |Power Transformer (EP, SWT,
GER, UK, AUS)
0B50186A_ |Power Transformer (OTR)
0B50184A _ |Power Transformer (JPN)
BAO8045A |Power Supply P.C.B. Ass’y
(EP, SWT, GER, UK)
BA08044A |Power Supply P.C.B. Ass’y
(AUS, OTR, JPN)
_ Heat Sink Ass’y
HA05953B |Front Panel Ass’y
_ Front Chassis Ass’y
HAO05956A |Selector Knob Ass’y
OHO5857D |CD Knob
0H05877B |Push Knob
HA05957A |Tone Knob Ass’y
HA05958A |Rec. Out Knob Ass’y
OHO5858B |Mute Knob
HA05955A |Volume Knob Ass’y
BAO8050A {Volume LED P.C.B. Ass’y
HA05833A |Leg Ass’y
BA08047A |Selector P.C.B. Ass’y
(EP, SWT, GER, UK)
BA08046A
BeeOr
P.C.B.
Ass’y
(AUS,
OTR,
JPN)
BA08043A
|Eq.
Amp.
P.C.B.
Ass’y
(EP,
SWT,
GER, UK)
BA08042A
as
Amp.
P.C.B.
Ass’y
(AUS,
OTR,
JPN)
OB803882A |Power Cord KP4819C
(EP, GER)
0B80383A |Power Cord BS6500 GTBS-2
(UK)
OB80385A
peta
Cord
KP-419S
LTCE-2F
(SWT)
0B05241A |Power Cord KP-560 (AUS)
0B80336A_
|Power
Cord
KP-235
(OTR,
JPN)
0B90157A |Cord Bushing SR-6N-4
(EP, GER, UK)
0B90530A _ |Cord Bushing 2104 (SWT)
0B90280A
pa
Bushing
2271
(AUS,
OTR,
PN)
OHO5863B |Rear Panel (EP)
OHO5864A_ |Rear Panel (UK)
OHO5865B |Rear Panel (SWT)
OHO5955A_ |Rear Panel (GER)
OHO5956A_ |Rear Panel (AUS)
0HO5867A |Rear Panel (OTR)
OHO5866A_ |Rear Panel (JPN)
OB903886A
{Fuse
T3.15A
250V
[F401]
(EP, SWT, GER, UK)
0B90384A |Fuse T2.0A 250V [F402]
(EP, SWT, GER, UK)
BA08041A |AC Outlet B P.C.B. Ass’y
(EP, SWT, GER)
BA08040A
|AC
Outlet
B
P.C.B.
Ass’y
(UK)
0B80394A |AC Outlet (AUS)
0B81986A {AC Outlet 2P (OTR, JPN)
OB90386A
|Fuse
T3.15A
250V[F401]}
(AUS)
0B90478A_
|Fuse
6.3A
250V
[F401]
(OTR, JPN)
BA08231A
|
AC
Outlet
P.C.B.
Ass’y
(AUS)
BA08039A | AC Outlet A P.C.B. Ass’y
(OTR, JPN)
0B70049A
|
Voltage
Selector
(OTR)
BA08032A | Remote P.C.B. Ass’y
BA08049A
|
Speaker
Terminal
P.C.B.
Ass’y
(EP, SWT, GER, UK)
BA08123A
|
Speaker
Terminal
P.C.B.
Ass’y
(AUS, OTR, JPN)
0B81604A
|
Earth
Terminal
0E03032A
|BT4x8
Pan
Washer
Faced
(Black Chromate)
0E00921A
|
BT3x8
©
Binding
(Black
Chromate)
O0E03664A
|ST4x8
@
Tapping
(Black Chromate)
0E03157A
|
BYT3x8
©
Binding
with
Flat
Washer
0E03025A
|
BT3x6
©
Countersunk
OEO00868A
|
BT3x8
©
Binding
OE00888A | BT3x12 @ Binding
OE00985A
|
M3x6
©
Binding
(Black
Chromate)
Poe BEE BP BEEBE BO BREE Re RR BO oR eo RRR RRR cre Re rie
a

5.2. Front Panel Ass’y (A01)
Fig. 5.2
5.3. Front Chassis Ass’y (A02)
LOl
x: Unstocked parts.
scoews Description sehemusic Deseription
5.2.
Front Panel
Ass*y
(A01)
5.3.
Front
Chassis
Ass*y
(A02)
‘HA05953B
|
Front
Panel
Ass’y
=
Front
Chassis
Ass*y
BAO8031A | Power Switch P.C.B. Ass’y
(EP, SWT, GER, UK)
BAO8030A | Power Switch P.C.B. Ass’y
(AUS, OTR, JPN)
BA08027A | Headphone P.C.B. Ass’y
BAO8026A | Front P.C.B. Ass’y
(EP, SWT, GER, UK)
BA08025A | Front P.C.B. Ass’y
(AUS, OTR, JPN)
BA08034A | Speaker Switch P.C.B. Ass’y
BAO8035A | Volume A P.C.B. Ass’y
BAO8038A | Sensor P.C.B. Ass’y
OEOO606A | M3x6 @ Pan (3A)
OEOO896A | M3x6 6 Binding
OEOO877A |ST3x8 © Binding
OE0O868A | BT3x8 @ Binding
0H05723A | Power Switch Button
0C09392A | Power Switch Spring
0HO5714A | Dummy Cap
OE00855A | BT2x6 © Binding
Bee pe Oe
*
*
*
*
*
*
*
*

5.4. Heat Sink Ass’y (A03)
*: Unstocked parts.
Schematic
Ref, No. Part No,
5.4, Heat Sink Ass’y (A03)
OB80356A
OB80355A
OB80357A
Fig. 5.4
Description
_- Heat Sink Ass’y
0J06293A _ | Transistor Sheet
OB10380A | TR 2SA1358 [Q178L,R]
OB10881A |TR 28C3421
[Q176L,R/Q177L,R]
0B1i0290A | TR 2SA1491
{Q180L,R/Q182L,R]
0B10291A | TR 2SC3855
[Q179L,R/Q181L,R}
BAO8029A |Power Amp. P.C.B. Ass’y
(EP, SWT, GER, UK)
BAO08028A | Power Amp. P.C.B. Ass’y
(AUS, OTR, JPN)
4P Connector Ass’y [CN118]
2P Connector Ass’y [CN116]
2P Connector Ass’y [CN121]
0E03319A |M3x8 © Binding
OEO0868A | BT3x8 © Binding
0E03157A |BT3x8 @ Binding With Flat Washer
Hee » eB fF PR BNN FH