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STEREO TUNER

I(FRON+ PANEL

HCONTENTS
......................... 1 SPEClFICATlONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 R E A R P A N E L S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . . . . . 3 INTERNALVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 19 . . BLOCKDIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 PRINTED ClRGUlT BOARD . . . . . . . . . . . . . . . . . . . 11 13 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . 14. 15 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . 16. 17 EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 27
TO SRVICE PERSONAL

NIPPON GAKKl CO., LTD. H A M A M A T S U JAPAN 1 IW-qQl Printpd in laoan

.

WTO SERVICE PERSONAL
1. Critical Compnentt Information. Components having special characteristics are marked equal t o those originally installed.

A

and must be replaced with parts having specifications

2.

Leakage Current Measurement (For 120V Model Only). When service has been completed, it i s imperative that you verify that all exposed conductive surfaces are properly insulated from supply circuits.
@

@

Meter impedance should be equivalent to 1500 ohm shunted by 0.1 5pF. Leakage current must not exceed 0.5mA. Be sure t o test for leakage with the AC plug in WALL both polarities. OUTLET

B

EQUIPMENT UNDER TEST

AC LEAKAGE TESTER or EQUIVALENT

INSULATING TABLE

-

IISPECIFSCATIONS
FM SECTION
Tuning Range 87.6 108.OMHz 50 dB Quieting Sensitivity Mono (DX) 1.6pV (15.3dBf) (NR ON) 1.2pV (12.8dBf) Stereo (DX) 20pV (37.2dBf) (NR ON) 1OpV (3i.2dBf) h b l e Sensitivity (IHF Mono) 7 5 a . 0 . 9 ~ V(10.3dBf) Usable Sensitivity (DIN) .l .OpV (E) Mono (SIN 26dB). Stereo (SIN 46dB) .3.OpV (E) I-e Rarpoma Ratio 9548 IF Rslponro Ratio .l 15dB l Spurious R-ms Ratio. . . . . . . . . . . . . .lOdB A M Suppression Ratio 70dB Capture Ratio 1.2dB Local Alternate Channel Selectivity DX .85dB (U,C,R,A) Selectivity (two Signak)(DIN 40kHz Dev.) DX 70dB (E) Adjacent Channel Selsctivity DX 20dB (U,C,R,A) Signal t o Noise Ratio (IHF) Mono . . . . . . . . . . . . . . . . .94dB (U,C,R,A) Stereo :86dB (U,C,R,A) Signal t o Nobe Ratio (DIN-Weighted) Mono . . . . . . . . . . . 88dB (E) Stereo. 80dB (E) Harmonic Distortion Mono 100Hz. . .DX0.03%, Local 0.02% (U,C,R,A) 1 kHz . . .DX0.15%, Local 0,03%(U,C,R,A) 6kHz . . .DX0.4%, Local 0.06% (U,C,R,A) Stereo lM3Hz . .DX0.5%, Local 0.04% (U,C,R,A) 1kHz .DXO.5%, Local 0.03% (U,C,R,A) 6kHz. .DX0.8%, Local 0.07% IU,C,R,AI (4OkHz Dev) Stereo 100Hz DX 0.5%, Local 0.05% (E) lkHz DX 0.5%. Local 0.04% (El 6.3kHz. OX 0.5%, Local 0.08% (E) Strreo Separation (IkHz) (Local)

.............

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Subcarrier Product Ratio Metat Saturation Level

. . . . . . . . . - 3 m V (75dBf)
. . . . . . . . . . . .,250pV
513

.............

65dB

............ ......... ............ ..........

AM SECTION
Tuning Range

. . . . . . . . .510 - 1620kHz (U,C,R)

........

............ ............ ............... ................

Usable Sansitivity . . . . . Selectivity.. Signal t o N o b Ratio. Image R w n s e Ratio Spurious Response Ratio. Distortion (400Hz).

-

1620kHz (E.A,R)

. . . . . . . . . . . . . . . . . . . . 30dB . . . . . . . . . . . . . . . 55dB . . . . . . . . . . . . . . . 40dB . . . . . . . . . . . . . 50dB

. . . . . . . . . . . . . . . . . 0.2%

AUDIO SECTION
Output' Levelllmpedance (HIGH) FM (100% MOD, 1kHz) 1 V / 2 k a (U,C,R,A) 1.6VI2kS2 ( E ) FM (30% MOD, 400Hz) 0.3VIZkn REC CAL (50% MOD, 333Hz) 0.5V12kn Output Level/lmpedanee (LOW) FM (100% MOD, IkHz) . 0.5VI2.5ka (U,C,R,A) 0.8V12.5kn (E) A M (100% MOD, lkHzl 0.15V12.5kSZ REC CAL (50% MOD, 333Hz) 0.25VI2.5kn

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i

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GENERAL
Power Supply U.S. & Canadian Models General Model. European Model.

. . . . . . . . 120V, 60Hz . . . . . . . . .l 101120V, 50/60Hz

..........

. . . . . . . . . . . . 220V, 50Hz

220/240V, 50/60Hz

..

.

....... .....
a . . . . . .

......

+,.K , 240V, 50Hz Australian Model 240V. 50Hz Power CbnspmptionU.S. & Canadian Models 13W General Model. 13W European Model. 13W Australian Model 12W Dimemion ( W X ~ D )435 X 93.5 X 357rnm (U,C,R,A) (17-7 18" X 3-1132" X 14-1116") 435 X 93.7 X 357mm (E) (19-118" X 3-1/32'' X 14-1/16") Weight-. 5kg (Illbs)

............

............. .................. ................. .................

.

.

........................

mkHz. 1kHz. 10kHz

..........

.

.

...........

.65dB .65dB (U,C,R,A) 60dB (E) 50dB (U,C,R,A) 40dB (E)
.

Specifications subject to change without notice

MARKET
U: U.S.-Model C: ~ a n a d b n Model R: General Model
--, '

F-affiy Raporar 50Hz t o lOkHz

. . . . . . . . . . . . . . . 0+O.~d9 -0.3

:'. .,:

'. ,

,>.

.

., r : .

~&>%&g$-?~ g+*&&Fg&;2 -. --

A: Australian Model J: Japanese Model

. -. .,- .
.>

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WREAR PANELS
U .S .& CANADIAN MODEL

EUROPEAN MODEL

GENERAL MODEL

AUSTRALIAN MODEL

POWER TRANSFORMER GA67130 U. S. & Canadian models: European model: GA67 140 General model: GA67 120 Australian model : GA67150 TUNER CIRCUIT BOARD AM LOOP ANTENNA FRONT END Cl RCUIT BOARD POWER SWITCH (SW203) IC114 : LC6502C-638 IC113:LC7210 KEYBOARD UNIT CIRCUIT BOARD LED FREQUENCY & SIGNAL INDICATOR

1. Before Adjustment 1) Start adjustment approximately 5 minutes after the power switch is pushed on in order t o stabilize the operation of circuit. 2) Adjust the OSC coil and I FT using high-frequency or nonferrous screwdriver. 3) Adjust the FM section first. After that, adjust the AM section. 4) Set the switches t o the following positions unless otherwise specified. TUNING MODE. . . . . . . . . . . . . . . . . . AUTO RECCAL . . . . . . . . . . . . . . . . . . . . . . OFF 5) Be sure t o make adjustment after installing the bottom cover. 6) For connection with OUT PUT, use HIGH terminal.

2. Measuring Instruments Abbreviation
FM SG . . . . . . . . . . . . . . .FM signal generator SSG . . . . . . . . . . . . . . . . . Stereo signal generator AM SG AM signal generator OSC Oscilloscope DlST M . . . . . . . . . . . . . . Distortion meter FC . . . . . . . . . . . . . . . . . .Frequency counter ACVM . . . . . . . . . . . . . . . AC voltmeter Center meter . . . . . . . . . . .Ji00036 or equivalent DCVM . . . . . . . . . . . . . . . DC voltmeter

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< FM Tuner Section >
@

< Line Voltage Checkup >
Check to see if the specified voltage i s provided across each terminal and E in the tuner circuit board.
@

@

Use 19kHz L.P.F for OUTPUT L and R terminals and make auditory compensation. Then connect the oscilloscope, AC voltmeter and distortion meter. To check the optimum tuning point during adjustment, connect the auxiliary center meter (Ji00036 or equivalent, current sensitivity: 250pA) as shown in the figure. The accuracy of FM SG should be within +l kHz.

N Vcc

T.M

of auxiliary center meter is positioned at zero (center).

to check again. If the pointer i s posi-

pointer of auxiliary center meter positioned at zero (center)

+ 12 (.l1501
19K (C169)

FC FM S G

R197 and. J150 to force stereo mode. 2. Adjust until the frequency across terminals C169 and E becomes 19kHz i lOHz. ?
l ncrease output to maximum.

5

PLL input phase adjustment

300~2 FM ANT

Remove FC and 2.2M52 resistor.

Stereo ( L-R) modulation
OUTPUT

OSC

98MHz

+

lkHz

aural distortion i s

LOCAL mode.

"NOTE: 70dBp = 75.4dBf, 60dBp = 65.4dBf.

output is increased to maximum. R channel alone: adjust OUTPUT Lch VR103 until output is increased

level to minimum.

9% modulation

98MHz

+ lkHz

open across

itivity i s deteriod with FM A T T

98MHz

+

lkHz

10kHz output differs between when the
FM NR switch is at ON and OFF position.

< AM Tuner Section >
0

Connect the AM loop antenna t o the AM ANT terminals. Connect the AM dummy used for adjustment to AM SG. The accuracy of AM SG should be within k O . 1 kHz.

i
l

l

I

0

I l
i
i
2

Sensitivity confirmation

AM ANT

'

1

AM SG 630kHz r 0.1 kHz 1440kHz + 0.1 kMz 1080kHz + 0.1 kHz (400Hz 30% modulation) OSC,DlSTM

By shorting across the terminals TP(K4) and TPITG) in i-2. ,-:;ode, AM 1,08OkHz, FM 92.6 MHz and FM 98.OMHz are automatic:;;..\! stored into preset memories 8 to 10 respectively. . Confirm sensitivity Who? sensitivity by checking to see if 5 8 d B ~ ~ lower i s improper, ador tuning i s made at the 58dBb or lower just a described s 58dBb or lower in steps (lto (5). standard values. l
~

I
I
I

/OUTPUT ! LorR AM ANT

,?'

/ Fun-scale signal

I level indicator

i adjustment

VR204 AM SG /1080kHz t 0.1 kHz\

I1

Adjust so that all signal indicators light up when tuned..

1 When VR210 has
I been turned after
adjustment, readjust VR204. TUNING MODE SW -+AUTO

l
3
Auto reserarch reception conf irmation AM ANT AMSG TUNING UP, DOWN 400Hz 30% modulation Make sure that auto search reception can the be made w ~ t h TUNING button for both UP and DOWN

< Digital Control Section >

switches and con-

indicator above the PRESET

ed, respectively.

.In the same way, store the AM

The TUNING MODE LED turns manuallmono operation conMODE switch t o

be made with the TUNING button for UP and DOWN operations. Also confirm that when FM i s received, forced mon-

quency indicator. (When FM i s or "-" switch.

switch is pressed, the following 3

memory operation confirma-

frequency in P2 i s displayed and the P2 LED turns on.

seconds have

-r

ON MODE switch t o IN I T l A L STATION

When the POWER switch i s turned on, the frequency in P1 i s displayed without respect to the frequency which i s displayed before the POWER switch i s turned off. Therefore, before turning off the P ~ W E R switch, display a frequency which has

. After

5 or more seconds have passed, turn on the

~t this time, confirm that the frequency in P1 is displayed and

TUNER C I R C U I T BOARD

Full-scalle signal level indicator

I

Connect resistor across R467 to 5268,

1 Separation adiustrnent 1

l adiustment

Center Meter (Ji 00036 or equivalent)

m

7

F

M FRONT-END SECTION

DC NFB MPX DECODER SECTION

CIRCUIT BOARD (Panern Side)
FRONT E N D CIRCUIT BOARD