Sansui T-80 - Adjustment Procedures; FM Adjustment

2. ADJUSTMENT
2-1. FM Adjustment (See Top View on Page 8)
Note: 1. Selector ............
2. FM MODE/MUTING Switch
eee FM
esetjeges MONO/OFF
(1) FM IF, RF Adjustment and Dial Calibration
e@ Before making adjustments 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.
STEREO SG
AUDIO OSC
15KHz LPF
GENESCOPE
STEP SUBJECT
1. | LF Coil Adj.
In case of using
Genescope
IF Coil Adj.
In case of using
FM SSG &
DC volt meter
FEED SIGNAL
MEASURE
Output 80 dB
Genescope
98 MHz
ANT Input 20 dBf
(14.8 dB), 1 kHz
2. | Discriminator
| Coil Adj.
i Incase of using
| Genescope
Output 80 dB
| (100% MOD) FM SSG
Genescope
terminal | Point A and
3002 chassis
DC voit meter
JW63 F-3130
i t
i 4 t
F-3130
OUTPUT
L-CH or R-CH
Dist Meter
VTVM & Scope
Voltage between
TPO2 & TPO3
F-3130
Discriminator |98 MHz
Coil Adj. ANT Input 65 dBf
Incase of using | (59.8 dB), 1 kHz
Dist meter (100% MOD) FM SSG
No Input
3. | AFC Voltage No Input
Adj.
<T-80 Only>
4. | 106 MHz No Input
Dial
Calibration
<T-80>
106 MHz 106 MHz
Dial ANT Input 0 dBf
Calibration (—5.2 dB), 1 kHz
<T-60> (100% MOD,) FM SSG
5. |90 MHz No Input
Dial
Calibration
<T-80>
90 MHz 90 MHz
Dial ANT Input 0 dBf
Calibration (—5.2 dB), 1 kHz
<T-60> (100% MOD) FM SSG
6. | 106 MHz 106 MHz
RF Adj. ANT Input Minimum
value with sine wave
1 kHz (100% MOD)
FM SSG
Voltage.between
T™20 & TM25
F-3130
Dial Pointer
Indication of
Display unit
Diai Pointer
T02, T03
F-3130
T02, T03 & T01
F-3130
T02
F-3130
VRO3
F-3000
OUTPUT
L-CH or R-CH
VTVM & Scope
Dial Pointer
Indication of
Display unit
ANT
terminal
3002
Dial Pointer
OUTPUT
L-CH or R-CH
VTVM & Scope
ANT
terminal
3002
OUTPUT
L-CH or R-CH
VTVM & Scope
TCO3
F-3130
Tuning knob
LO4
F-3130
Tuning knob
OUTPUT ADJUST ADJUST FOR REMARKS
Point A F-3130 | T01 Max. IF waveform
F-3130
ANT Voltage between | Same as above Max. Indication
Chassis
of DC volt meter
Meter Range
3V
Steep linearity of /\y
S curve \ . ,
ay
i Make symmeirical i
1
Point A
| 1S curve a
| No Input Voltage between | T02 DC OV +01 V
TPO? & TPO3 | F-3130
Min. THD
DCOV+0.1 V
DC7V Note:
As for T-80, steps
3, 4.& 5 should be
performed after
106 MHz grounding the collec-
Tuning knob
Tuning knob
tor of TR15 on
106 MHz F-3000
106 MHz
Max. Output
TCO1, TCO2 Max. Output
F-3130
to be continued P
2