Service Manuals, User Guides, Schematic Diagrams or docs for : NIKKO Audio FAM-450 hfe_nikko_fam-450_service_en
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CONTENTS
1. SPECIFICATION I.
2. EXTERNAL VIEW 2.
3. INTERNAL VIEW 3.
4. PARTIAL DISASSEMBLY. 3-5.
5. DIAL MECHANISM .. . 5.
6. MEASUREMENT AND ADJUSTMENT 6-A,
7. PRINTED CIRCUIT BOARD
TUNER PCBASSY 9.
8. BLOCKDIAGRAM IO.
9. OVERALL DIAGRAM I I.
10. PARTIAL CHANGES MADE
ACCORDINGDESTINATION.... 12.
11. PARTS LIST. t3-* t5.
12. SEM ICONDUCTOR SPECI FICATION
TRANSISTOR COMPLEMENT. . 16.
.
FIELD EFFECT TRANSISTOR COMPLEMENT . 16.
RECTIFIER-DIODE, ZENER-DIODECOMPLEMENT.. ..... I6.
INTEGRATEDCIRCUITCoMPLEMENT.... .17_19..
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SPECIFICATION
1. FM TUNER SECTION
NOMINAL LIMIT
Sensitivity (IHF) 2ttY 3pV
Ouiting Slope (s/N 50dB) 4.51tY 1OpV
Selectivity (lHF) 55dB 35dB
lmage Rejection (98MHz) 45dB 40dB
lF Rejection (98MHz) 70dB 60dB
Signal to Noise Ratio 65dB 60dB
Capture Ratio (lHF) 1.6dB 3dB
Muting Sensitivity 12dB rSdB
Distortion (MONO) o.20/o O.5o/o
Distortion (STEREO) O.5o/o 1o/o
Stereo Separation (1KHz) 42dB 3sdB
Output Voltage 690mV r3dB
De-Emphasis (SOpSec) 10KHz -10.37dB !2dB
2. AM TUNER SECTION
Sensitivity (tHF) 300pV/m 1000prV/m
Selectivity (lHF)110KHz . . . 35dB 30dB
lmage Rejection (1000KH2) 45dB 40dB
lF Rejection (1000KH2) 35dB 30dB
Distortion 17o 2Vo
Signal to Noise Ratio 45dB 40dB
Output Voltage 135mV 12dB
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EXTERNAL VIEW
FRONT PANEL
(1) Signal/Tuning meter (5) Tuning knob .
(2) Dial pointer (6) Hi-blend switch
(3) Stereo indicator (7) FM muting switch
(4) Power switch (8) Selector switch
REAR PANEL
(1) Coaxial cahle holder (GND) (6) AM bar antenna
(2t 7 5 ohm FM antenna terminal (7) AC supply cord
(3) 300 ohm FM antenna terminal (8) AC 22Ol24O selector switch
(4) Ground terminal (9) Output terminal
(5) AM antenna terminal
2.
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INTERNAL VIEW
TOP VIEW BOTTOM VI EW
(1) Selector switch (1) Power switch
(2t Fly wheel (2t Signal/Tuning meter
(3) Power switch (3) Fly wheel
(4t Tuner PCB ass'y board (41 Tuner PCB ass'y board
(5) Power transformer (5) AM bar antenna
(6) AC cord
(71 AM bar antenna
(8) Antenna terminals
PARTIAL DISASSEMBLY
CABINET REMOVAL
PHoro-l
PHOTO_1 PHOTO_2
Stand the cabinet up and remove screws (1-4) as shown in Photo-1.
Return the cabinet to its original position and pull forward and then lift upto remove it (Photo-2).
BOTTOM PLATE REMOVAL
Turn the cabinet and remove screws (1-9) as shown in
Photo-3.
PHOTO-3
3.
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FRONT PANEL REMOVAL
PHOTO-4 PHOTO_5
Remove screws (1-2) and nut (3) as shown in Photo 4-5.
TUNER PCB ASSY BOARD REMOVAL POWER TRANSFORMER REMOVAL
PHOTO_6 PHOTO-7
Remove screws (1-8) as shown in Photo 6 then lift the Remove screws (1-2) as shown in Photo 7 then lift the
circuit board up to remove it. transformer up to remove it.
SWITCH PCB ASSY REMOVAL FLY WHEEL REMOVAL
PHOTO-8 PHOTO-9
Remove screws (1-2) as shown in Photo 8 and pull Remove screws (1-4) as shown in Photo 9 and pull
forward to remove it. forward to remove it.
4.
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POWER SWITCH REMOVAL METER REMOVAL
I
PHOTO-10 PHOTO-1 1
Remove screws (1-21 as shown in Photo 10 and pull Remove screws (1-4) as shown Photo 11 and pull
forward to remove it. forward to remove it.
DIAL MECHANISM
U
5
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MEASUREMENT AND ADJUSTMENT
Set the tuning dial pointer to zero(0) position on the dial panel.
lf the dial pointer fails to coincide with the zero(0) position at the left end of the knob rotation, have it reset to zero(O)
Q! oosition by sliding on the dial string and then proceed as follows.
FM SECTION
1. FREOUENCY COVERAGE AND TRACKING ADJUSTMENT
For connecting, reler to Fig. 1.
For adjusting point. refer to Fig. 2.
Step Generator and Dial Freq. Adjust lndication and Remarks
Oscillator coil core
1 88 MHz L104
Adjust for max. reading
Oscillator Trimmer
2 108 MHz c111
Adjust for max. reading
3 88 MHz L101 ANT coil core, RF coil core
4 108 MHz FM1 Adjust for max. reading
5 88 MHz L102 ANT coil core, RF coil core
b 108 MHz FM2 Adjust for max. reading
7 Repeat step 1, 2,3, 4,5, 6 Align after complete tuning
STANDARD DUMMY ANTENNA
TO FM ANTENN lo ol
l-zfi,
OFF
TERMINALS I
L,rrraar--l
Ltlllrlrrll
L,rr rralrrra-
I llatltl[lrtr ]
I ltttrlatrtttfl
e I lttrlrrf]l[
I
^ lttlltrltrl I
ooo o \4ttgtltult
I
to !17
I
ol_
c- _e-_c . c
E -r#;* tt oo e - =:-' C o a
a--il --
_i
(9l
OSCILLO
SCOPE
FAM-450 Shield cable
STANDARD SIGNAL GENERATOR
;aa_..
OOeo@O
Fig. 1 DISTORTION METER
6.
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AM2 FM2 AMl FM1
Fig.2
2. FM-IF STAGE ADJUSTMENT
For adjustment of the discriminator coil T2O1 , connect the testing instruments as shown in Fig. 1 and then proceed
as follows:
(1) With no RF signal applied to the receiver, adjust the lower core of T201 until the pointer of the tuning meter on
the receiver indicates the center position of the meter scale.
(2) Apply RF signal to the receiver and adjust the tuning knob so that the tuning meter indicates the center posi-
tion.
(3) Under this condition, adjust the upper core of r2o1 for minimum distortion.
(4) Repeat the above steps (1)through (3) two or three times so that the distortion factor is most improved.
Note: For adjusting point, refer to Fig. 2.
3. FM SEPARATION ADJUSTMENT
with stereo-modulated RF signal applied to the receiver, make adjustment as follows:
(1) Turn the semi-fixed resistor R415 (150K ohm) fully clockwise.
(2) Connect a frequency counter to the test point #1 5 on the Tuner PCB Assy Board. Adjust the semi-fixed resistor
R405 (10K ohm) for the frequency of 19 KHz t 19 Hz.
(3) Adjust the semi-f ixed resistor R415 (150K ohm) for maximum stereo separation.
Note: For adjusting point. refer to Fig. 2.
o
7.
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AM SECTION
1. FREOUENCV COVERAGE AND TRACKING ADJUSTMENT
The following is intended to described the procedure of adjusting the AM
section of the receiver using a sweep
generator.
ln the adjustment, the output voltage is applied through inductive coupling.
For adjustment. place a loop antenna near the receiver under test and
ovserve the waveform of detector output
(atthe point
lf22 on the Tuner PCB Assy Board)displayed on the alignment oscilloscope.
For adjustment point, refer to Fig. 2.
The waveform disprayed on the arigment oscilloscope is as shown in Fig.
Fig.3.
Step Generator and Dial Freq. Adjust lndication and Remarks
Oscillator coil core adjust for
1 52O KHz T301
maximum reading
2 1650 KHz Oscillator trimmer adjust for
AM2
maximum reading
Antenna coil adjust for
3 600 KHz AM BAR ANT.
maximum reading
4 1400 KHz Antenna trimmer adjust for
AMl
maximum readinq
5 Repeat steps 1-4 to obtain best tracking
2. AM-IF STA.GE ADJUSTMENT
This adjustment is similar to the frequency coverage and tracking adjustment.
Switch the sweep generator from RF
to lF and follow the procedure below.
The adjusting procedure is as follows:
(1) With the receiver set to a high receiving frequency (variable capacitor in full
open position), adjust T302 and
T303 until the lF waveforem becomes maximum.
(21 lf , in this case, the adjustment is difficult because of disturbing sighal,
the variable capacitor may be turned to
facilitate the adjustment.
(3) The waveform displayed on the aligment oscilloscope is as shown in Fig. 4. For adjusting posint, refer to Fig. 2.
520KHZ 1,650KH2
MARKER SIGNAL MARKER
600KHZ 1400KHZ SIGNAL
MABKER MARKER
SIGNAL SIGNAL
Fis. 3 Fig.4
8.
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BLOCK DIAGRAM MODEL FAM.4sO
EXT. AM ANT.
FRONT END CERAMIC FILTER
cF101 CF103
EXT. AM ANT.
AM TUNER
SELECTOF
SWITCH
AM BAR ANT.
AC LINE
POWER TRANSFORMER
to.
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FM IF AMP.
Dtsc colL
1[B
i SIG./TUNING METER
OUT PUT
POWER SUPPLY
HI.BLEND SW.
LT STAB.
I
I
t'
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OVERALL DIAGRAM MOD
PCa
orol 28K49
R 101 RF COIL
17 Ll02 1103
cl04 7Pf,PO
10t8 1027
ur.ArArcEl-rq - -I --t
lir
cF1 01,CFt 03
I sooq I
|-_BALANCE
SFE ] O.7MA8
I
-Jld
3.3K
R 103
Ll 05 2.2t,H
.. irbi 68
/ eloa 1i' 9:: L1o4
4
c
2SC
4
\
{,
o
4
r--- __T__] lcBN R4O1 22K
4K cl .!
AM AilT coII LI
c30a .o1
rc 301 HAI t 9? C9O3 22OM,/16
O9O1 2SO23S
POWER SW l+
t- 4
t-
wHr lo
#
cl.oo47
{DC5KV)
3ilfl
ffiilb
r+ lllo
BLX
d
o
=
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lo
o
FilE
WHT
YEL
ac 120v q
l WL I>
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"t
ol
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;;
t-- s4 Y
Ilt
Y mD,
-'t
I
I x
cl .o1 Ac125v I
j
F3 1A L----r YEt
ac 220v PT
r-r -253
fd 6A. CANADA
il.
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DIAGRAM MODEL FAM-45O
R2O5 12K
T103
oP
1027 o
rl
cFl 01,CF1 03
l:"' c
SFE 1 O,7MA8 SIGtrAL/TUtrI TG M ETI
l- oi
d
-Jl
G
L105 2.2ilX
Ft
ot
ol
8nt
s2
ooN otr o"'
ffiJ, lqr
dJ
"|,,
_ llurlle
F415 tsoK(a) R4OA 6.ar
fl aF3or
33x I ncrc lnlto 1rK c11o1ou/16 c41-6-.OO1 (38KHz)
-
: I L =eflr.1 ----- jr
:
iu*u*: rr+J-{s t
"".+ + +
c422 +l
0 f
c415
-rffiFf0o1
R41?.4.3K
cltz-.oor lll
i6lnnnn.
lnrrsr.rrl 1l .. ltRa23- rx
lL _ ji_ I r
-t
I
$E
I
.oors@
o o
th
l.i l"
717
c423
BF3O2
t3axHz)
o
DE-EMPHASIS
2 EJ.-
t5,, o.oorzlft)
ol 50,. 680P
-*t-
-t
I
L----l YEI
PT
T 1-253
td SA CANADA
tt.
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I NTEGATED CI RCUIT COMPLEMENT SPECI FICATION
l
Maximum Ratings (TA=25oC) Electrical Characteristics {Typical Valuel TA=2soc
Signal to Noise Detector
Power Power Operating Storage Distortion
ot Service Ratio Output AGC. FOM Manulacture
Type Class Supply Dissiptation Temp. Range Temp. Range lnput=74d8,, Consumption
I nput=74dBp I nput=74dBp Input:
Pd. Topt Tstg Mod.=30% Vcc=1 2V
Mod.=30% Mod.=30% loodBrr=odB
(v) (MWI {'ct {"c} t%) lmA)
(dB) (mV)
HAl 197 AIV RADIO 15 450 -20-+70 -55-+125 53 0.4 212 75 14.5 HITACHI
CONNECTION DIAGRAM (TOP VIEW}
SCHEMATIC DIAGRAM
o
17.
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INTEGRATED CIRCUIT COMPLEMENT
Mtrimum fl6rino Ta=25C Elocrrical Ch..acrsisaica (Typicrl v.l@) Ta = 25c
Otsrating Stor.gt Signri ro
Oi3sipaion Limntino
U FM.IF
{c}
T3tg
rc)
l5
t*) {d8) {da}
HAI l37W OuaJhrur-D.l.clor l4 550 t9 -20- +80 -55- + I 25 32 3m ol MrN.57 45 HITACHI
-3dB oohtl
GoNNECTTON DTAGRAM (TOP VIEW)
SCHEMATIC DIAGRAM
t
i",.
Ui
r8.
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INTEGRATED CI RCU IT COMPLEMENT SPECI F ICATION
Maximum Ratings (TA=25"C) Electrical Characteristics {Tvpical Value) TA=25oC
Power Lamp Operating Storage lnput Output
rype Class of Seruice Supply Dissipation Driver Temp. Range Temp. Range lmpedance
Stereo
Separation
Channel
Balance
Distortion
(stereo)
Lamp
Level
Voltage Manufacture
\,
Pd. l1 Topt Tstg Zin lnput
{dB) (dB) l"/.t {mV)
{v) (mwl (mA) ("c) ("c) (KC,) =2-mV (mV)
FM STEREO 50 0.1
HA1 196 15 490 -20 - +70 -55 - +125 75
(at 1 KHz)
tl.5 (at 1 KHz)
MtN 4.O 1.2V H ITACH I
DEMODULATOR
CONNECTION DIAGRAM (TOP VIEW)
INDEX
-.
v
;
SCHEMATIC DIAGRAM
--a
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I
t
bgr I
I
I
I
I
I
I
-J
r9.
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