Nakamichi PA-7 User manual

Service
Manual
re
Nakamichi

CONTENTS
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2. Parts Location for Electrical Adjustment.............. 0200 ce cence eee en ene ete ne ee een wwees
a. *“Bléctrical Adjustments so -i55 6 Sosa a ore we SAS eke Shh Ae WS Oh Sh HR Bi NE BA
3. 1. Preparation [or AGiUStmen’: jie Og 6:65 ko) or SES BER ROR RS RAW ER ES
oy 2. DC. Balance AGIUStMent: 66.6 seca oes acd ood SE eS ORS ee Da we ee CA ei ee Bead
3. 3. Idling Current: Adjustment). sos sass e ecaG aks oe Soe aS we stand wee) oe ee OSE 6s tee eeses
4.;. Mechanism: Aas y-and Parte Vist 5.4.68 oh he Oke % See BS eee hea Salers oe RS RRL
4. 1. SV TIEIVOSIS?. ogi 0 sa, eg ha Se oe Sra lo Nees ES eee Gg ae a ee A ed Seas Bae ne, ae he
4, 2. Mandie ti Assy (AGT cic. oh erate he we ewe es ey ee Sw Sas abla Se gh ee a ne ed is
4. 3. Handle F Ase’y (AG2) 3.5 oe e, ww nta GccaiwiSees el Sans, eek Ga ok Se la a oe ee ee
4, 4, PrOnt Panel Ass ¥ CA0S): itd gece, hth Phe eS: cere Bs Al Bae cde re. ie ca Bae aa ae ae
4. 5, Rear Panel Ass ¥. (A064) e-5 a 5 oie Gi ie oe Se Sa Se eS Re SA ee SS AN, Seed
5. Mounting Diagrams and Parts List .. 0... cc te eet ew wet ccc ee ee ec ee wwe et eee tenes
5. 1. Chipping LEP CB, Assy se 3c. ees enh i > Hw a ee Re Se we Se es Ee RS
o:. “2. Power WDC. BoAse ye 6.5. sibs oh ete ae Arle se ewe Be GE a
5. 3. Goittiiter PC AS6 F< 5s0p i5ses ce wot a ce ee i Bh OW we tu eae ee OE ES ew es
5. 4. PITA a SS nig es tg gat Gevastgl Sa: he ae eee Waa eo ee enor ee Bc ee eB a aca Ses ee
5. 35. BIND RP A PASS Ye a ee a yas ected te, Sensi Sr nee Sine ca ac eee teh es BO hed) Bua Selden ls
5. 6. Protector: P2C 7B. ASS Vy: iene Berea $l Wee We Sh a ae a ee. Se a Bae See se es
5. 7. PEOteCtOR P.O BASS Yo ig oe ese ie nS Se ks aise a a Boas eco es kW. do le BS Se ce ee
Gi. SSCHEMAtIC DiagrAin: Sots. fos serie: ies dd Xn Si as Wat Be ALS fe id he © ES Slr Na ee Be
Te Witg Diggramy: ois, shea cactee did Yara tos wie BG BO Skee RA Ee ER ONE BS eh ok Bs dnb ae
Sy. (BIOCK Diagram.© 2 6.06 4. 68. eo i ee Be EF ee Sh Re be 2 hele ce RO Rs wens 2 eee Rearend wk
De. , BRECINCALIONG:: 6S Griese erste Seda hcl ee oR ocd. Shit Geet) ceric duods b ee We ev Alot teorkes hemes Geeledeck: dence Gees cg ees
1. GENERAL
1.1. Voltage Selector
Voltage selector is installed on the rear panel for Other version of the Nakamichi PA-7.
This voltage selector can select 110 V, 120 V, 220 V or 240 V at customer’s disposal.
1.2. Packing Materials, Owner's Manual and Power Cord
Part No, Description Q’ty
OFO3875B Outer Carton PA-7 1
OFO3876C Outer Carton PA-7E 1
OFO3869B = Inner Carton PA-7 1
OFO03870B Inner Carton PA-7E 1
OF03877B Packing 2
0D04531A Owner’s Manual English 1
OD04530A Owner’s Manual English/German/French 1
OB90137A Power Cord PA-7 (U.S.A. & Others) 1
OB90139A Power Cord PA-7 (Australia) 1
OB90138A Power Cord PA-7E (220V Class 2) 1
OB90154A Power Cord PA-7E (Switzerland) 1
OB90140A Power Cord PA-7E (UK) 1
OFO3887A Power Cord Band 1

4, MECHANISM ASS’Y AND PARTS LIST
Synthesis AOl HA04832A! Handle L Ass
Serial
No.:
B20601001
—
Serial
No.:
320601001
—
HA04832A | Handle L Ass’y 1 OHO4A631A | Handle L
HAO4846A | Front Panel Ass’y PA-7 1 OJO5006A | Viny! Chioride Plate A
HA04847A| Front Panel Ass’y PA-7E 1 0OHO0O4655A | Vynil Chloride Plate B
BAO5688A
|
Clipping
LED
P.C.B.
Ass’y
2
OEO3310A
|
M4x6
®
Binding
(Black
Chromate)
BA05687A
|
Power
LED
P.C.B.
Ass’y
1
HA04833A | Handle R Ass’y 1 HA04833A; Handle R Assy
0304989B
Front
Chassis
1
Serial
No.:
B20601001
—
OB71003A
|
Power
Switch
1
OJO5048A
|
P.C.B.
Spacer
4
0OHO4632A
|
Handle
R
1
BA05754B
|
Limiter
P.C.B.
Ass’y
PA-7
1
OJO5006A
|
Vinyl
Chloride
Plate
A
2
(U.S.A.)
0OHO4655A
|
Vinyl
Chloride
Plate
B
1
BA05755B
}
Limiter
P.C.B.
Ass’y
PA-7
us
OE03310A
|
M4x6
&
Binding
(Black
Chromate)|
2
(Australia
&
Others)
&
PA-7E
0H04634D
|
Heat
Sink
B
1
HA04846A|
Front
Panel
Ass’y
PA-7
1
0H04633D
|
Heat
Sink
A
1
HA04847A!
Front
Panel
Ass’y
PA-7E
1
OJO4990A
|
Side
Chassis
2
Serial
No.:
B20601001
—
QJO05025A
|
Stud
2
BA0O5684B
|
Amp.
L
P.C.B.
Ass’y
1
0HO04618B
|
Front
Panel
PA-7
1
0M04377B
|
Caution
Label
1
0H04619B
|
Front
Panel
PA-7E
1
0H04629B
|
Top
Cover
1
HA04849A
|
Power
Switch
Button
Ass’y
1
OJO5011A
|{
Cushion
A
6
OJO5000B
|
Spring
1
OJO5055A
|
Cushion
B
1
0H04652B
|
Guide
1
0B12253A
|
Diode
Bridge
15G4B41
2
OHO4653B
|
tDuminator
1
0J05047B
Ground
Plate
Collar
1
OHO4651A
|
Lens
2
0J04992C
|
Ground
Plate
1
OJO5005A
|
P.C.B.
Cushion
2
OJO5003A
|
Center
Stud
1
OB40328A
|
Electrolytic
Capacitor
4
33000uF 100V
Power Transformer 120V
PA-7 (U.S.A.)
Power Transformer 220/240V
PA-7 (Australia) & PA-7E
Power Transformer 120/220-240V
PA-7 (Others)
Bottom Chassis
Leg T-D
Rear Panel Ass’y PA-7
(U.S.A.)
Rear Panel Ass’y PA-7 (Australia)
Rear Panel Ass’y PA-7 (Others)
Rear Panel Ass’y PA-7E
Amp. R P.C.B. Ass’y
Heat Sink D
Heat Sink C
Insu-Lock
Protector L P.C.B. Ass’y
Protector R P.C.B. Ass’y
Bolt M4x10 Hex. Socket Head
(Black Chromate)
M3x6 9% Binding (Black Chromate)
ST 3x6 @ Binding
(Black Chromate)
ST 3x5 9 Countersunk
BT 3x6 © Binding
ST 4x14 @ Binding
(Black Chromate)
0B50046B
0B50048B
OB50049A
OHO4650A
OJO5009A
HA04845A
HA04843A
HA04842A
HA04844A
BA05685B
0H04671C
0H04635D
OBO8515A
BA05980A
BAOS981A
OE00745A
OEO0985A
OE03283A
OE03220A
OQEQO857A
QOE03298A
COWNNPRRONDHE HONDO CONN WH OHH ORE HEHE HRr BH Re
OE03289A | M4x12 @ Binding (Bronze)
OE03030A | M3x6 9 Binding (Nickel)
QEO0713A | M3x6 9 Truss (Bronze)
OEO03290A | M4x15 © Binding (Bronze)
QEO3299A | Nut Hex. M4
OE03287A | M4x6 © Binding (Gold)
OF03296A | M4x4 % Binding (Black Chromate)| 1
OEOO907A
|
ST
4x8
@Binding
(Black
Chromate)
0E03286B | Washer 6mm (Black Chromate)
0£03291A | Nut Hex. M6 (Black Chromate)
OE00972A | Nut Hex. M3 (Nickel)
0E00594A | M3x8 © Binding (Bronze)
0£03034A | M4x8 ® Binding (Nickel)
OJO5063A | Fiber Washer 0.5T

2.
3.
3.1.
(1)
(2)
(3)
PARTS LOCATION FOR ELECTRICAL ADJUSTMENT
Amp. R PC.B.
DC Balance
Idling Current
Fig. 2
ELECTRICAL ADJUSTMENTS
Preparation for Adjustment
Insert shorting pins into the Input Jacks.
Remove loads of the speaker terminals.
Before starting adjustment, allow twenty minutes or more
after the power is turned ON.
3.2. DC Balance Adjustment
(1)
(2)
Connect a DC voltmetr to the L (R) channel speaker
terminal.
Adjust VR101 (VR201) to obtain 0 +100 mV on the DC
voltmeter.
3.3. Idling Current Adjustment
(1)
(2)
(3)
(4)
Connect a DC voltmeter between TP101 and TP102 (TP201
and TP202) on the Amp. L (R) P.C.B. Ass’y.
Adjust VR102 (VR202) to obtain 40 mV on the DC
voltmeter (idling current: 40 mA).
Repeat 3.2 and 3.3 one or two times.
Remove shorting pins from the Input Jacks.

4,2. Handle L Ass’y (A01)
4.1. Synthesis
Fig. 4.2
4.3. Handle R Ass’y (A02)
LO1
Fig. 4.3
4.4, Front Panel Ass’y (A03)
Fig. 4.1
Fig. 4.4

5. MOUNTING DIAGRAMS AND PARTS LIST
|
4.5.
Rear
Panel
Ass’y
(A04)
Notes:
1.
Mounting
diagram
shows
a
dip
side
view
of
the
printed
circuit
board.
2.
Diode
is
18853,
181555,
or
1SS176
unless
otherwise
specified.
3.
Abbreviation
for
part
name:
TR
—
Transistor,
SiD
—
Silicon
Diode,
ZD
—
Zener
Diode
RK
—
Carbon
Resistor,
RM
—
Metal
Film
Resistor,
RF —
Fail
Safe
Type
Resistor,
RC
—
Cement
Resistor
LO4
CE
—
Electrolytic
Capacitor,
CM
—
Mylar
Capacitor,
CC
—
Ceramic
Capacitor,
CP
—
PP
Capacitor,
04
|
CT
—
Tantalum
Capacitor,
CF
—
Film
Capacitor,
C
—
Mica
Capacitor
5.1. Clipping LED P.C.B. Ass’y 5.2. Power LED P.C.B. Ass’y
’
SS ;
:
aa
LO4
Fig. 5.2
Fig. 4.5
cer
ee
Part
No.
Description
{P.LED)
sat R& Ob 68 LOW
pac hedin panies Ginvaned tien peaisenwgnabiibacent acd ineh cabita otis 200k od
HA04845A
HA04843A
HA04842A
HA04844A
QOB90093A
0B90094A
0B90118A
0B90120A
OB81364A
OB81365A
OJ05029A
0H04624D
0HO4660D
0H04625D
OB90092A
OB90087A
0B70049A
0E00818A
OEO3058A
OE03313A
OE00078A
OEO0506A
Rear Panel Ass’y PA-7
(U.S.A.)
Rear Panel Ass*y PA-7 (Australia)
Rear Panel Ass'y PA-7 (Others)
Rear Panel Ass’y PA-7E
Serial No.: B20601001 —
Fuse Holder PA-7
(U.S.A. & Others)
Fuse Holder PA-7 (Australia) &
PA-7E
Fuse 10A PA-7 (U.S.A. &
Others)
Fuse T5A PA-7 (Australia) &
PA-7E .
Pin Jack
Speaker Terminal
Leg T-A sO
Rear Panel PA-7 (U.S.A. &
Australia)
Rear Panel PA-7 (Others)
Rear Panel PA-7E
AC Inlet PA-7 (U.S.A.)
AC Inlet PA-7 (Australia &
Others) & PA-7E
Voltage Selector PA-7 (Others)
M3x8 © Binding (Black Chromate)
M4x8 © Binding (Black Chromate)
BT 4x8 @ Pan (Black Chromate)
Speaker Terminal Nut
Pin Jack Washer
Pin Jack Nut
Fuse Holder Washer
Fuse Holder Nut
Washer 4mm Toothed Lock
Nut Hex. M4
Bete eR NORM Ne Bete eR elt
R402 6.8 I0W
Merde ia JAM A be
ae “R403 6.8 1OW

5.4. Amp. L P.C.B. Ass’y
CN-101 oe |
{C~ LED)
Q130
2SA1320
ey fl24
2
© Input Pin Jack oa Zz
E ana
- 28Ald02
gan al26. arte “quia
8
2809263
EEE
RAIENG
wl eee
c107 loop.
(O44
Rizd 3 aw
clog Ot | Bane: 8 SR 0G
RISQ 5. QW
Fig. 5.4
22P 50V J
1/4W F 0B41539A
Amp. L P.C.B. Ass’y| R105,111 OBO9491A 1K
BA05688A | Clipping LED P.C.B. BA05754B | Limiter P.C.B. Ass’y BA05684B
Ass’y
PA-7
(U.S.A.
&
R106
0B09424A
aM
4.75K
i4w
F
0B41538A
10P
50V
J.
Canada)
0B60215A
|
Amp.
L
P.C.B.
R107,112
|
OBO9760A
|
RM
332
1/4WF
0B40336A
CE
10u
35V
0B60214A
|
Clipping
LED
P.C.B.
BA05755B
|
Limiter
P.C.B.
Ass’y
|
Q101
OB06257A
|
FET
2SK240
Ri09
OB22638A
|
RM
47.5K
1/4W
F
0B41540A
{|C
100P
100V
J
LED301
0B12260B
|
LED
Red
PA-7
(Australia
&
Q102-105
|
0B10103A
|
TR
2SC3333
(11)
|R110,116
|
0B22632A
|
RM
75
1/4W
F
0B41537A
|CM
0O.1p
100V
J
0B82418A
|
LED
Cord
(1)
Others)
&
PA-7E
112,131
119
.
0B40331A
|CE
47
16V
(BP)
132,133
R113
0B22633A
|RM
150
1/4WF
0B01674A
|CE
10pu
25V
BA05687A
|
Power
LED
P.C.B.
0B60217A
|
Limiter
P.C.B.
134,135
R114,115
|
0B09203A
|RM
10K
1/4WF
0B40330A
|CE
10u
100V
Ass’y
Q401
0B10103A
|
TR
2SC3333
137
R117
OB22666A
|
RM
10
1/4W
F
0B01405A
|CE
1
50V
ZD401
0B06233A
|
ZD
10V
RD1OEB3
|
Q106,109
|
0B10143A
|
TR
2SC3334
R118
0B22567A
|RM
100
1/4WF
0B41619A
|CE
lu
100V
0B60213A
|
Power
LED
P.C.B.
D403
0B12252A
|
SiD
S5500D
Q107,129
|
0B10102A
|
TR
2SA1i320
R121,124
|
OB24058A
|
RF
3
2w
J
0B19003A
|
Thermistor
102F
|.
0B12251A
|
LED
Green
D404,405
|
0B06181A
|
SiD
1SS53
R122,123
|
OB24064A
|
RC
1
2w
0B90084A
|
Thermal
Switch
75
C
L401
0B03919C
|
Inductor
36mH
0B10142A
|
TR
28C1321
R125-138
|
0B24057A
|
RF
1
2w
J
0B90083A
|
Relay
10A
250V
AC
R401-404
|
0B24065A
|RF
6.8
10W
0B10101A
|
TR
2SC2238B
(14)
OB81366A
|
2P-S
Post
(2)
0B12252A
|
SiD
S5500D
R405
0B24074A
|
RF
2.4K
1WJ
OB10100A
|
TR
2SA968B
R139
OB24059A
|
RF
5.1
2WJ
0B82412C
|
DC
Cord
(R)
(1)
OBO01272A
|CE
100u
25V
R406
OBO1846A
|
RK
4.7K
1/4WJ
0B10130A
|
TR
2SC3281
R140
OB09752A
|
RM
274K
1/4WF
0B82413C
|
DCCord
(BL)
(1)
OB82493A
|
P-LED
Cord
_
R407
OB01888A
|
RK
10K
1/4WJ
0B10129A
|
TR
2SA1302
R141
OB09446A
|
RM
33.2K
1/4W
F
0B82414A
|G-Prot.Cord
(1)
OEO0857A
|
BT
3x6
9
Binding
R408
OB05622A
|
RK
2.2K
1/4WJ
|
Q115-121
|
0B10098A
|
TR
2SA1294
(7)]R142,145
|
OBO05641A
|
RK
47K
1/4WJ
0B82415C
|G-Input
Cord
(1)
(1)
|
R409
0B24072A
|
RF
1.3K
2WJ
Q122-128
|
OB10099A
|
TR
2SC3263
(7)
|
R143,149
|
OBO01846A
|
RK
4.7K
1/4WJ
0B82419C
|SPOutR
Cord
(1)
OJ04998A
|
Power
Reflector
(1)
|
C405
OB01674A
|
CE
10p
25V
Q136
0B10145A
|
TR
2SC3298B
R144
OB24062A
|
RF
4.7K
1/2WJ
0B82420D
|
SP
Out
BCord
(1)
0JO05010C
|
Sheet
(1)
|
C407
0B40341A
|
CE
33u
100V
D101,102
|
9B06181A
|
sip
18853
R146
OB09509A
|
RK
20K
1/4WJ
0B82480B
|
Input
Cord
(1)
RL401
OB90088A
|
LimiterRelay
(1)
105,109
R147
OB05625A
|
RK
220K
1/4W
J
0F00754A
|M38x8@Pan
(20)
M401
0B08342A
|
Spark
Killer
PA-7
D103,104
|
0B06458A
|
sip
30D-2
R148
0B05776A
|
RK
1M
1/4WJ
OEO00966A
|
M3x5
@Binding
(2)
(U.S.A.
&
Canada)
D106,107
|
0B12252A
|
sip
sS5500D
R150
OB05622A
|
RK
2.2K
1/4WJ
OBO8680B
|
Heat
Sink
A
(2)
(1)
108
R151
OB24060A
|
RF
1.8K
1WJ
OE00972A
|
Nut
Hex.
M3
(2)
M401
0B08445A
|
Spark
Killer
PA-7
VR101
0B32043A
|
Semi-fixed
VR
4.7K
|
R152
OB24073A
|
RF
2.2K
1/2WJ
OB90082A
|
TR
Mica
(2)
(Australia
&
Others)
|
VR102
0B32052A
|
Semi-fixed
VR
150
|
R153
OB05615A
|
RK
22K
1/4WJ
OB90075B
|
P.C.B.
Stand
(1)
& PA-7E (1) | R101,108 | OBO9547A | RM 2.21K1/4WF | R154 0B240738A | RF 2.2K 1/2WJ
TF402-405
|
0B08715A
|
Thermal
Fuse
129
R102
OB09562A
|
RM
75K
1/4WF
|
R155
OB01857A
|
RK
1K
1/4WJ
OB81366A | 2P-S Post (1) | R103 OB22672A | RM 22.1K1/2WF | C101 0B41541A | C 3380P 100V J
0B82423B
|
Limiter
Cord
(1)
|
R104
0B22671A
|
RM
15K
1/2WF
|
C102
0B41536A
|
CM
10u
200V
K

5.5. Amp. R P.C.B. Ass’y
R203 RNA RR! 2 De
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manufacturer.
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suitable DC supply or batteries during initial check-out
procedures,
CAUTION:
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
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8. BLOCK DIAGRAM
Current
Mirror
Bootstrap
Speaker
Current
Mirror
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Clipping
Indicator
Saturation
Detector
Protector
Thermal
Over Current
0.C.
Rush
Current
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-60V
+60V
Power Switch
Power
Supply Section
GNO AC
Input
Fig. 8
Notes: 1 Table of wire colors
BRN — Brown BLU — Blue
RED — Red VIO — Violet
ORN — Orange GRY — Gray
YEL — Yellow WHT — White
GRN — Green BLK — Black
2. Component side view of the P.C.B. is illustrated unless otherwise specified.
3. Wire tube color is shown in (_ ).

9. SPECIFICATIONS
Continuous
Average
Power...
.
200
Wx
2
(8
ohms,
both
channels
driven,
20-—20,000
Hz,
0.1%
THD)
Output
(NEW
IHF)
Dynamic
Power
per
Channel
...
300
W
(8
ohms)
Dynamic Head Room ....... 1.7 dB (8 ohms)
(New IHF)
Power Bandwidth (Half ...... 5 Hz — 50 kHz
Rated Power, 0.1% THD)
Damping Factor (NEW IHF)... Greater than 60/60/60
20 Hz/1 kHz/20 kHz
Input
Sensitivity/Impedance
...
2.0
V/75
k
ohms
(rated
power)
(New
IHF)
140
mV
(1
W
output)
Frequency
Response
........
20--20,000
Hz
+0,
—0.5
dB
(1
W,
NEW
IHF)
7—150,000
Hz
+0,-—3
dB
Signal
to
Noise
Ratio.
.......
Better
than
120
dB
(Input
Shorted,
Rated
Power,
IH
F-A-WTD)
Residual
Noise
Level
........
Less
than
25
uV
(IHF-A-WTD)
Total
Harmonic
Distortion
....
Less
than
0.1%
(Rated
Power,
20—20,000
Hz)
Intermodulation
Distortion
...
Less
than
0.1%
(Rated
Power,
60
Hz:
7
kHz,
4:1)
Stereo
Separation
..........
110/100/80
dB
(Input
Shorted)
100
Hz/1
kHz/10
kHz
Output
Complement
........
16
transistors
per
channel
Output
Current
Capability
....
14
A
continuous,
50
A
peak
(per
channel)
Power
Supply
...........-.
700
W
toroidal
transformer,
132,000
uF
total
filter
capacitance
Power
Source..........2-.-
120,220,
240,
110-120/220-240
V
AC;
50/60
Hz
(According
to
country
of
sale)
Power
Consumption
........
700
W
max,
Dimensions
.........-2-+6¢-
435
(W)
x
200
(H)
x
421
(D)
mm
17-1/8
(W)
x
7-7/8
(H)
x
16-9/16
(D)
inches
Approximate
Weight
........
27
kg;
59
Ibs.,
8
oz.
@
Specifications
and
design
are
subject
to
change
for
further
improvement
without
notice.
@®
STASIS
manufactured
under
license
from
Threshold
Corporation.
@
STASIS
is
a
trademark
of
Threshold
Corporation.
10