Sony HCD-RX80, Service Manual, Page: 34 / 90

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FM Polar Adjustment (EE, CIS model only)
Connection 1:
Procedure :
1. Set the modulation of FM RF SSG to AUDIO 1 kHz, 10 kHz
deviation according to "Connection 1".
2. Tune the set to 69 MHZ.
3. Adjust the RV1702 so that the reading of frequency counter
connected to TP1702 becomes within 31.25 kHz ± 0.05 kHz.
(VCO adjustment)
4. Then record the reading of the level meter connected to TP1701
5. Set the modulation of FM RF SSG to AUDIO 31.25 kHz, 10
kHz deviation according to "Connection 2".
6. Tune the set to 69 MHz.
7. Set the CT1701 to be mechanical center.
8. Adjust the L1701 so that the reading of the level meter con-
nected to TP1701 become maximum.
Then adjust the CT1701 so that the reading of the level meter
connected to TP1701 becomes maximum. (SUB CARRIER
PEAK Adjustment)
9. Adjust the RV1701 so that the level at the moment becomes 14
dB higher value than the level recorded in step 4. (SUB CAR-
RIER LEVEL Adjustment)
FM ANTENNA terminal
(75
Ω
)
75
Ω
coaxial
set
FM RF SSG
Carrier frequency : 69 MHz
Output level
: 1 mV (60 dBµ) (at 75
Ω
open)
Modulation : AUDIO 1 kHZ, 10 kHz deviation
Connection 2:
FM ANTENNA terminal
(75
Ω
)
75
Ω
coaxial
set
FM RF SSG
AF OSC
Audio 31.25 kHz
external
modulation
terminal
Carrier frequency : 69 MHz
Output level
: 1 mV (60 dBµ) (at 75
Ω
open)
Modulation : AUDIO 31.25 kHZ, 10 kHz deviation
(EXTERNAL MODULATION)
Adjustment Location :
EE, CIS model :
[TCB BOARD] (Component Side)
RV41
IC1701
RV42
RV1701
CT1701
TP1702
(VCO)
(FILTER) TP1701
TM1
FE1
+
–
FREQUENCY COUNTER
+
–
LEVEL METER
IC41
L1701
RV1702
RV41
AM tuned level
Adjustment
RV1701, TP1701
Sub carrier level
Adjustment
RV1702, TP1702
VCO Adjustment
RV42
FM tuned level
Adjustment
CT1701, L1701, TP1701
Sub carrier peak
Adjustment
• Abbreviation
EE: East European model