Sansui 7900Z - Adjustments; FM Adjustment Procedures

4. ADJUSTMENTS (see Top View on Page 18, 19 & 20)
1. FM Adjustment (See Fig. 4-1 & Fig. 4-2)
Note. 1. SELECTOR.........--.-+:. FM
2. FM MODE/FM MUTING Switch... . Off
3. FMIF BAND Switch .......... Wide (9900Z Only)
STEREO SG
AUDIO OSC
(1) FM IF, RF Adjustment
FEED SIGNAL
STEP| SUBJECT
1. | AF Coil Adj. ANT
98 MHz ANT Input
25 dBf (19.8 dB)
1 kHz (100% MOD)
FM SSG
Terminal
3002
_|_
2. Discriminator
98 MHz ANT i
Coil Adj. 65 dBf (59.8 dB above
1 kHz (100% MOD)
FM SSG
3. | SIGNAL 98 MHz ANT Input Same as
Indicator 20 dBf (14.8 dB) above
Adj. 1 kHz (100% MOD)
FM SSG
98 MHz ANT Input
65 dBf (59.8 dB)
FM SSG
above
(2) FM STEREO Adjustment a Fig. 4-1 & Fig. 4-3)
MEASURE
OUTPUT
SIGNAL
Indicator
Lead Wire of
sR52 (F-3296)
dVR5
(F-3300)
ADJUST ADJUST FOR
Make 3 lamps
lighting
dT1
(F-3300)
REC OUT
L-ch or R-ch
Dist Meter
SIGNAL
Indicator
Same as above
dT2, dT3
(F-3300)
dVR5
(F-3300)
Max. Reading
Make 3 lamps
lighting
Make every 8
lamps lighting
REMARKS
signALODDOOOOO
REMARKS:
Adjust the VR within
center of lighting level
Confirm Both Channel
Note: 1. SELECTOR.......0.......4.. FM
2. FM MODE/FM MUTING Switch.... On
FEED SIGNAL MEASURE
STEP SUBJECT FROM TO OUTPUT ADJUST ADJUST FOR
1. | PLL VCO Adj. | 98 MHz ANT Input ANT FM STEREO dVR1 Light indicator
65 dBf (59.8 dB) Terminal Indicator (F-3300)
FM SSG 3002
Pilot 19 kHz (9% MOD)
R (or L) Mode
1 kHz + Pilot (100%
MOD) STEREO SG
PLL
VCO
Adj.
|
98
MHz
ANT
Input
Same
as
Lead
Wire
of
dVR1
76
kHz
+60
Hz
In case of 65 dBf (59.8 dB) above dR46 (F-3300) | (F-3300)
Freq. Counter | FM SSG (No MOD) Freq. Counter
2. | PILOT Cancel | 98 MHz ANT Input Same as Lead Wire of dVR2 Min. Reading
Adj. 65 dBf (59.8 dB) above dR82 (L-CH) (F-3300)
FM SSG (F-3300)
Pilot 19 kHz (9% MOD) dR83 (R-CH)
(F-3300)
DC Volt Meter
PILOT Cancel | 98 MHz ANT Input Same as Same as above dVR2 Min. THD
Adj. 65 dBf (59.8 dB) above Dist Meter (F-3300)
In case of FM SSG
Dist Meter Pilot 19 kHz (9% MOD)
L-ch or R-ch Mode
1 kHz + Pilot
(100% MOD)
j