Sony HCD-C70 - Electricaladjustments; Tuner Section Adjustment 00.0.0

SECTION 4
ELECTRICAL ADJUSTMENTS
4-1. Tuner Section Adjustments
FM SECTION
Note: The FM front-end is carefully adjusted at the factory and is
supplied as one whole block for replacement.
Setting :
FM RF signal
generator
75Q coaxial
FM ANTENNA terminal
Carrier frequency :98MHz
Modulation : kHz, 75kHz deviation
Output level : lmV (60dBiL)
VOM
(DC range) 502A
FM Discriminator Alignment (NULL Check)
BAND switch: FM
Procedure:
1. Supply a imV (60dBy) 98MHz signal from the ANTENNA
terminal.
2. Tune the set to 98MHz.
3. Adjust IFTS1 for 0Vdc reading on the VOM.
Note: FM tuned indication lighting level adjustment should be
made after FM discriminator alignment.
FM Tuned Indication Lighting Level Adjustment
BAND switch: FM
Procedure:
1, Supply a 17.8V (25dBy) (Except C70: G, IT model) or 12.5uV
(22dBy) (C70: G, IT models) 98MHzsignal fromthe ANTENNA
terminal.
Tune the set to 98MHz.
Adjust RV52 so that the light up.
Confirm that the light off with FM RF SSG output
level set at -3dB.
Awh
MW SECTION
Setting : 60cm
Loop
antenna B
AM FF signal
generator
30% amplitude Loop
modulation antenna A
by 400Hz signal
MW Tuned Indication Lighting Level Adjustment
BAND switch: MW
Procedure:
1. Set loop antenna A so that the loop antenna B input level
becomes ImV (55dBu).
2. Tune the set to 1,404kHz (9k step mode)
(10k step mode : 1,490kHz).
3. Adjust the RVS1 so that the light up.
4. Confirm that the light off with AM RF SG output level
set at -3dB.