Sansui G-4700 - AM Adjustment and Board Controls; AM IF Adjustment & Dial Calibration; Driver Circuit Board Adjustments

2. AM IF Adjustment & Dial Calibration
Note: 1. Selector
FEED SIGNAL. MEASURE |
STEP SUBJECT ADJUST AD]U
1. | IF Coil VC4 on TP15 on F-3062 | T03 on F-3062 -Max. Output
FM Pack
ee Pe ae
CasebaasbereMeasdorebocsteacde
10
L03 on F-3062 600 kHz 7
Tuning knob 1400 kHz
TC2 on FM Pack
Genescope output
65 dB .
_
ANT
600 kHz ANT Input
as mini as possible terminal
1 kHz (30% MOD) 3002
AM SSG
unit
unit
4. | 600 kHz
RF Adj.
5. 1400 kHz 1400 kHz ANT Input
RF Adj. as mini as possible above
1 kHz (30% MOD)
AM SSG
6. | Signal 1000 kHz ANT Input
80 dB 1 kHz
(30% MOD) AM SSG
{Indicator
3. Driver Circuit Board Adjustments
Note: 1. Master Volume ...... Minimum
2. Room Temperature
18°C ~ 28°C (65°F ~ 83°F)
SUBJECT EQUIPMENT
DC OV Adj.
8 ont, b
oe Or
DC Volt Meter
2. | DC 8V Adj.
(R-ch)
Same as above
Dial Pointer
Indication of
digital display
Dial Pointer
Indication of
digital display
REC OUT
connect VITVM
& Scope
Same as Same as above
Same as | Signal indicator
above lamp
MEASUKE OUTPUI
ADjUST ADJUST FOR |
) | | OV | No input Signai
Output Terminai (L-ch VROS F-3066
Output Terminal (R-ch)
F -3062
F-3062
TC1 on FM Pack
VRO2 Make every 8
F -3000 lamps lighting
- .
Lt
ST FOR
REMARKS
450kH2 455aHr
eLacodocodedbeoadecet
100 ii ®
1400 kHz
-_
SIGNALDOOOOOOO| -
3. For adjustment, run the unit for more than 3 minutes
after the power is switched on.
| VRO6 F-3066
REMARKS
OV . No Input Signal
Bias current Same as abeve See Fig. 3-1 VRO7 F-3066 4.5mV (15 mA) | No Input Signal
Adj. (L-ch)
Ww
.
eine
—
4. | Bias current Same as above See Fig. 3-1.
Adj. (R-ch)
@ Bias Current Adj. Point (Fig. 3-1)
(TROA) Volt meter
Volt meter S
(TRO2) |
®@ Intermediate frequency of AM Section(See Figs. 3-2 & 3-3).
Since the band pass filter of both 450 kHz type and 455 kHz type
are adaptable to the IF stage, pay attention for inserting position of
jumper wire and a diode for setting the 1F OFFSET ROM value
when replacement.
Fig. 3-2.
Stock No. of
IF filter, TOS
on F-2975
450 kHz 0910490
455 kHz 4230680
Inserting Posi-
tion of jumpér
wire on F-3000
Inserting Posi-
tion of Diode
on F-3000
D21,D24
Intermediate
frequency
Fig. 3-3
(F-3000)
VRO8 F-3066 4.5 mV (15 mA) _ | No Input Signal
IC
Ol
MSM5540
=
AWN
D23,22.21
D26,25,24
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Component View