Sansui G-4700 - Adjustments and Calibration Procedures; FM Adjustment Procedures; FM Stereo Adjustment Procedures

3. ADJUSTMENTS (See Top View on Page 8)
1. FM Adjustment
Note*, 1. SQlOClOr: c: 3) o.4..9 mc lone alee bee oh eed FM MONO 3. Connection .. Connect the output of genescope to TP
2. FM Muting Switch .............. OFF through 100 pF ceramic capacitor.
DETECTOR PROBE BLOCK STEREO SG
o-"Wwn—4
4.7k2 10pF
IN -) OUT DIST METER
2 15KHz LPF
(1) FMIF, RF Adjustment and Dial Calibration
Before making adjustment of steps 2 ~ 5, run the unit for more than 2 minutes and
make the dial pointer go round on the dial scale at once by tuning knob.
FEED SIGNAL MEASURE
STEP| SUBJECT RON 70 OUTPUT ADJUST ADJUST FOR REMARKS
1.
IF COIL 98 MHz ANT Input ANT REC OUT T1 on FM Pack Max. Output
as mini as possible - Terminal F-3062
1 kHz (100% MOD) 3002
FM SSG
Connect VTVM
& Scope
2. | Discriminator { Output 60 dB Pin Lead wire of T01, TO2 on Steep linearity
Coil Genescope marked IF} R18 on F-3062 | F-3062 of S curve
on FM Make symmetrical
Pack S curve
Discriminator | 98 MHz ANT Input ANT REC OUT T1 on FM Pack Mini Distortion
Coil 65 dBf (59.8 dB terminal | Connect VTVM | F-3062
In case of using] 1 kHz (100% MOD) 3002 Scope & Dist TO1, T02 on F-3062
Dist Meter FM SSG Meter
3. | Tune Indicator | Same as above Same as_ | Between Pin 07 | T02 on F-3062 OV +0.1V Pin07(F- 3062)
above & 08 on F-3062
Connect Volt Pin08(F-3062)
Meter
4. | AFC Bias Adj. | Same as above Same as_ | TPO02 on F-3062 | VRO3 on F-3000 TV £0.2V Before this adjust-
above Connect Volt ment ground collec-
Meter tor of TR15 (lead
wire of R35) & base
of TR17 on F-3000
Calibration
indication of TC3 on FM Pack i 98 MHz
display unit F -3062
3AaiiS dS 4OGVE
|TCA TCR
on FM Pack
98 MHz ANT Input
as mini as possible
1 kHz (100% MOD).
FM SSG
ANT
terminal
3002
TP11 on F-3062
1 Connect VTVM
& Scope
Max. Output
Mode switch *>FM AUTO
* The ANT Input level at
which muting turns off.
The second
segment becomes
luminous
VRO1 on F-3000
98 MHz ANT Input
15 dBf (9.8 dB)
1 kHz (100% MOD)
FM SSG
Signal Indicator
Signal
Indicator
(2) FM STEREO Adjustment
Note? Select <.8 Ser yn ee ee oe eS FM AUTO
FEED SIGNAL |
STEP| SUBJECT Moye «| ADJUST | ADJUST FOR REMARKS
1. | PLL VCO 98 MHz ANT Input 65 dBf ANT VRO2 on Center Position
Adj.
F-3062
of
lighting
range
Stereo Indicator
(59.8 dB) FM SSG Pilot 19 kHz terminal
ia MOD) SUB 1 kHz + Pilot 3002
100% MOD) STEREO SG
PLL VCO 98 MHz ANT Input 65 dBf Same as Lead wire of VRO2 on | 76 kHz +50 Hz
Adj. (59.8 dB) FMSSG (No MOD) | above R22 on F-3062 | F-3062
In case of using
counter
Read the output
value of REC OUT
Read value above | Confirm Rch >Lch
—40 dB
98 MHz ANT Input 65 dBf
59.8 dB) FM SSG Pilot 19 kHz
9% MOD) L Mode SUB 1 kHz
Pilot (100% MOD) STEREO SG
Same as L-ch REC OUT
above connect VTVM
& Scope .
Same as R-<h REC OUT
above connect VT VM
& Scope
VRO1I on
F -3062
Same as above
im