Sansui CP 7 Service Manual

Page 2

3. ADJUSTMENTS

w 3-1. Reference Frequency Adjustment of Synthesizer Control Circuit

Note: 1. Selector Switch .............. .- ...... . TUNER
2. Band Selector Switch . ................. MW
3. See Fig. 3-7 on page 6 for MEASURE OUTPUT point.
STEP SETTING MEASURE OUTPUT ADJUST ADJUST FOR REMARKS .-
1. Memorize 1450 kHz Point® (Pin 91 of F-3693) rrc1 (F3588) 1450.0 kHz 93, «:50

using Memory key 1 Frequency Counter .m

3-2. FM Adjustment

Fig. 3-1
STEREO Sfl
DUY SCOPE
m sea um um um.
o--c .0:xe c oi mm: or a O
m" M .m urnur 0W mpg. WV: 2:: _°
AUDIO 05¢ WM

i 3
(1) FM lF Adiustment
Note: 1. Selector Switch . . . .............. . . . . . TUNER
2. Band Selector Switch .................. FM
3. FM MODE Switch .................... MONO
4. See Fig. 3-5 on page 6 for MEASURE OUTPUT and AD}UST point.
@ FEED SIGNAL MEASURE
STEP SUBJECT FROM _ To OUTPUT ADJUST ADJUST FOR REMARKS
i. Discriminatar 98MH2 ANT input ANT Between TPi and dTl +5mv ~ -5mV
coil adj. 65.2dBf (60:13) term inai TP2 of F3644 (F6644)
(No.MOD.) 7551 DC Volt Meter

O FM RF adjustment 3: Dial Calibration are not necessary. when these circuits are defective, replace FM Front-end Pack with new one.

(2) FM Stereo Adjustment .
Note: 1. Selector Switch .................. TUNER

2. Band Selector Switch . . FM
3. FM MODE Switch ........... . . . . . STEREO
4. See Figs. 3-5, 3-7 on page 6 for MEASURE OUTPUT and ADJUST point.
FEED SIGNAL WEASURE
STEP SUBJECT FROM TO OUTPUT ADJUST ADlUST FOR REMARKS
l. PLL VCO Adj. 98MHz ANT input ANT Stereo indicator dVRi Light indicator Adjust the (WM
65dBf (59.8dB), FM terminal (F6644) within center of
$56, Pilot19kH219% 750 lighting level
MOD.), R or L MODE
ikHz + Pilot (100%
MOD.), STEREO SG
FLL vco Adj, No input - Pin 9 of dlCZ dVRi 19kHz tZOOHz
in case of using - FNQ- CDUMBY (F3544) .._
Freq. Counter (F3544)
2. Muting Level 98MHz ANT input ANT Tuner Out or dVR'z Output signal
Adi. 18dBf (12.8dB), lkHz terminal indicator (F-3693) comes out.
(100% MOD.), FM 556 75:2 VTVM. Scope

Page 5

34. AM IF Adiustment

Note: l. Selector Switch ............ TUNER
2. Band Selector Switch .
3. When F3645 AM IF circuit boardvls out of adjustment,
replace it with new board.
4. See Fig. 3-6 on page 6 for FEED SlGNAL, MEASURE
OUTPUT and ADJUST point.

o ADJUSTMENT FOR FM '

0 The impedance of FM antenna terminal is 759. Therefore, con-_

FEED SIGNAL MEAsukg
STEP SUBJECT FROM TO OUTPUT ADJUST ADJUST FOR REMARKS
1. IF Coil Adi. Genescope Output Point ® through Point © eT2 MAX. Outpur
9MB 0.0mm connect (F3645) (F3645)
0.047uF between
point and "a "l
ground (F6645) ,
2. GCMSCOPB OUID Point ®through Point © eCFl MAX. Output
50:13 0.022uF and 1m (F6645) (F-3645l M
(F-3645) M
Fig. 3-4
"I 53645 F4635 $3545 rod
r ----- m
lflifii
-il&mw
1
3-5. AM RF and Dial Calibration
Note: 1. Selector Switch ............. TUNER
2. Band Selector Switch ......... MW, SW1, SW2. LW
3. See Fig. 3-7 on page 6 for MEASURE OUTPUT and AD-
JUST point.
4. Preset the following frequencies to the memories.
MEMORY KEY MW SW1 SW2(SW) LW
SW2
1 (6) 522kHz 3.8MHZ 5.8MHZ 155kHZ
2 (7) 603kHl 4.4MHz 6.6MH2 164kHz
4 (9) i404kHz 10.0MHz 14.0mm 272m:
5 (10) 1611kHz 12.0MHZ 155MHz 281kHz
(1) XX Model (FM, MW, SW1 and SW2)
a) Dial Calibration
STEP SUBJECT SETTING ('fijfifififi ADJUST ADJUST FOR REMARKS
1. MW Dial Depress MEMORY key 1 to Point ® (between eT'I 0.9V :0.1V
Calibration readout 522kHz eR42 and Ground (F6693)
of F6693
DC Volt Meter
Depress MEMORY key 5 to Same as above eTC6 8.4V 20.1 V F4533
readout 161 1 kHz (F-3693) "3 '
2. SW1 Dial Depress MEMORY key 1 to Same as above 2T6 0.9V toil V em
Calibration readout 3.8MHz (F'3693l my
"C34
Depress MEMORY key 5 to Same as above eTC4 8.4V 10.1 V ,,
readout lZMHz (F6693)
3. SW2 Dial Depress MEMORY key 6 to Same as above eT4 0.9V $0.1 V
Calibration readout 5.8MHz (F6693)
Depress MEMORY key 10 to Same as above eTC2 8.4V £0.1V
readout 155kHz (F6693) .

l
l

nect coaxial cable (3C-2V etc.) between FM SG and antenna
terminal when wiring.

C There are two kind in indication of FM SG output attenuator

1. Attenuator with marking of 75:1 open . . .open indication
type.

2. Attenuator with marking of 7547. load or close . . . load or
close indication type.

0 FM 56 output level in this FM adjustment are described as open

indication type. The right table shows relations among FM 56
attenuator indication (dB), available power ratio (dEf) and
antenna terminal voltage (dB/nV) in each indication type.

close indication type.

Fig. 3-5

TF2 T1
l l
2 dlCFl
E
e
dTl
dvnl dICFZ
:l
F-3644
Fig. 3-7
Scam
FM
Front end Tuner Out
Finis R55
Pine! 55'-
7-35
arcs
avnz
15-3645

:11 are 915 :14 era

a

ITCS ITC4 eTCEeYCZ oTCl

w e
T 9.1142
t

9

kVO-O-
§---4)l

F4393

DC Volt Me! I

FM 56 Available Antenna
Attenuator Power Terminal
indication Ratio Voltage
mmmm» an fimsmn
Load or close 0 118 11.2 dBf 12 dB/uv
indication type 54 dB 65.2 dBf 66 dB/uV
i:
Fig. 3-6 I ' F
..' __0.047
®\ in/0.022;
eTl \ .
£11-
3cm 9 353d?
3T2
1K M>~ 6
l eRZ
"$3771"? -~-<«~
F-3645 ©

Fig. 3-8

F3846

urcr chz
are:
6

.O.®

oTC4 eTCS eTCE ITCZ aTCS

r- ______
| MW(EU) nLl
L ______

etc I

erx X)
LWlEUl

%.

Terminal I

m

UFINETUNE VR

1: rune» mm .e
14 END UY L h
.5 was». ouTPur Rae»

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Page 7

. 3-6. AM RF Adjustment and Dial Calibration

Note: 1. Selector Switch ............. TUNER F'g 3'9 score
2. Fine Tune Volume (eVRI) ...... Center Position AM ssc UNIT
4 3. See Fig. 3-8 on page 6 for MEASURE OUTPUT and AD- 0
)UST point. c Momrunanc g
0- --o OUTO- 0
(l) XX Model (FM, MW, SW1 and SW2)
BAND FEED SIGNAL MEASURE
STEP SELECTOR SUBIECT FROM TO OUTPUT ADJUST ADJUST FOR REMARKS
SWITCH
1. MW GOOkHz 600kHz Input Point ® TUNER eT7 MAX. Output Turning point of the
Dial 6008 400Hz (JF6, OUTPUT (F4646) dial pointer LED
Calibration (MOD. 30%), F8646) L AM SSG Pin No. I3,
F-3646) or
R-ch (Connector
. Pin No. 15,
F-3646)
VTVM & Scope
I400kHz I400kHz Same as Same as above eTC4 Same as above
Dial Input 60dB above (F6646)
Calibration 400kHz (MOD.
30%). AM SSG
2. SW1 2.5MH2 2.5MHZ ANT ANT Same as above eT8 Same as above Same as above
Dial Input SOdB terminal (F-3646)
Calibration 400kHz (MOD. 750
30%), AM SSG
6M Hz 6MHz ANT Same as Same as above eTC6 Same as above
Dial Input 60dB above (F3646)
Calibration 400kHz (MOD.
- 30%), AM SSG
3. SW2 8MHZ 8MHz ANT Same as Same as above eT9 Same as above Same as above
Dial Input 60dB above (F-3646)
Calibration 400kHz (MOD.
30%), AM SSG
18MHZ iBMHz ANT Same as Same as above eTC6 Same as above
Dial Input 60:! B above (F-3646)
Calibration 400kHz (MOD.
30%), AM SSG
4. MW 600kHz 600kHz Point ® Same as above eLi Same as above
RF Adj. Input 60:18 UPS, (F-3646)
400kHZ (MOD. F-3646)
30%), AM 555 /\ /
1400kHz 1400kHz Same as Same as above eTCI Same as above / V
RF Adi. Input GOdB above (F-3646)
400kHz (MOD.
30%), AM SSG
5. SW1 2.5MHZ 2.5MH2 ANT ANT Same as above eTS Same as above
RF Adi. Input 6003 terminal (F-3646)
400kHz (MOD. 755':
30%), AM SSG A f
6MHz 6MHz ANT Same as Same as above eTC2 Same as above \/ V
RF Adi. InpUt GOdB above (F4546)
400kHz (MOD.
30%), AM SSG
6. SW2 8M Hz BMHz ANT Same as Same as above eTE Same as above
RF Ad). Input 60dB above (F-3646)
i 400kHz (MOD.
30%), AM SSG \ A /
18MHz 18MHz ANT Same as Same as above eTC3 Same as above \/ V
RF Ad). Input 60dB above (F-3646)
400kHz (MOD.
30%), AM SSG

ole

l.
,l

(2) EU Model (FM,

LW, MW and SW)
BAND -- FEED SIGNAL MEASURE
STEP SELECTOR SUBJECT FROM To OUTPUT ADJUST ADIUST FOR REMARKS
SWITCH .
1. LW 170kHz 170kHz Point (B) TUNER eTT MAX. Output Turning point of the
Dial Input 60dB (1P6, OUTPUT (F6646) dial pointer LED
Calibration 400kHz (MOD. F-3646) L-ch (Connector from red to green.
30%), AM 556 Pin No.13,
F3646) or
Rah (Connector ,
Pin No. IS, ' .
F3646)
VTVM 8: Scope , T - V ..
300kHz 300kHz Same as Same as above eTC4 Same as above -
DiaI Input 60dB above (F-3646) .
Calibration 400kHZ (MOD.
30%). AM 556 u: .
2 MW 600kHz 600kHz Same as Same as above as Same as above Same as above . '
Dial Input GOdB above (F-3646)
Calibration 400kHz (MOD.
30%), AM SSG
1400kHz l400kHz Same as Same as above eTCS Same as above
Dial Input was above (F-3646)
Calibration 400kHz (MOD.
30%), AM SSG
3 SW 8M Hz 8MHz ANT ANT Same as above eT9 Same as above Same as above
Dial Input GOdB terminal (F-3646)
Calibration 400kHz (MOD. . 7m
30%), AM SSG
ISMHz lSMHz ANT Same as Same as above eTCE Same as above
Dial Input 60GB above * (F-3646)
Calibration 4DOkHz (MOD.
30%), AM 556
4 LW I70kHz i70kHz Point (9 Same as above eLl Same as above
RF Adi. Input 6065 (1P6, LW)
400kHZ (MOD. F-3646) F8646)
30%), AM SSG /\ /
300kHz 300kHz Same as Same as above eTCI Same as above \/ V
RF Adj. Input SOdB above (F-3646)
400kHz (MOD.
30%), AM SSG
5 MW 500kHz SOOkHz Same as Same as above eLI Same as above
RF Adj. Input 60dB above MW)
400kHZ (MOD. F6646)
30%), AM SSG /\ f
I400kHz l400kHz Same as Same as above eTC2 Same as above \/ V
RF Adi. InpUt 60dB above (F3646)
400kHz (MOD.
30%), AM SSG
6 SW 8M Hz SMHz ANT ANT Same as above eT6 Same as above
RF Adi. Input 60dB terminal (F3646)
400kHz (MOD. 7581
30%), AM sse J\ /
isMHz 18MHz ANT Same as Same as above eTC3 Same as above /
RF Adi. Input GOdB above (F6646)
400kHz (MOD.
30%). AM SSG
OAbbrev'
Equipment Olners
AM FM GeneralarOscilloteope . . . Gnnempe Antenna . . ...................
AM Standard 5mm Generator . AM 556 Modulation . . . .
FM Standard signal Generator . FM sst. Total Harmonlc Distortion
FM Stereo Generator sum 56
Oscilloscope. . . sum
Audio Oscillator . . . , Audio 0st
Distortion Meter . . . ................ Dist. Meter