Electrical Checks; Tuner Section - Sony NAS-E35HD Service Manual

NAS-E35HD/SS-CE35HD
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment. There-
fore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specifi ed value with the following checks.
RF LEVEL CHECK
CD board
TP216 (RFACO)
TP5 (VC)
Procedure :
1. Connect an oscilloscope TP216 (RFACO) and TP5 (VC) on
the CD board.
2. Turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confi rm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
Note: Clear RF signal waveform means that the shape " ◊ " can be clearly
distinguished at the center of the waveform.
RF signal waveform
E-F BALANCE (1 TRACK JUMP) CHECK
CD board
TP3 (TEI)
TP5 (VC)
Procedure :
1. Connect an oscilloscope to TP3 (TEI) and TP5 (VC).
2. Turn the power ON.
3. Load a disc (YEDS-18) and playback the number 5 track.
4. Confi rm that the level B and A (DC voltage) on the oscillo-
scope waveform.
1 track jump waveform
DVC
level = 1.3 ± 0.6 Vp-p symmetry
20
SECTION 5

ELECTRICAL CHECKS

oscilloscope
VOLT/DIV : 200 mV
TIME/DIV : 500 ns
level : 1.1 ± 0.3 Vp-p
oscilloscope
center of
waveform
B
A (DC voltage)
Connecting and Adjustment Location: CD board
– CD BOARD (CONDUCTOR SIDE) –
TP5 TP3
(VC) (TEI)

TUNER SECTION

FM AUTO STOP CHECK
SET
Procedure :
1. Turn the power on.
2. Input the following signal from Signal Generator to FM an-
tenna input directly.
* Carrier Freq : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Please use 75 ohm "coaxial cable" to connect SG and the set. You
cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and scan the input FM signal with
automatic scanning.
4. Confi rm that input Frequency of A, B and C detected and auto-
matic scanning stops.
The stop of automatic scanning means "The station signal is re-
ceived in good condition".
TP216
(RFACO)
generator
+
75 Ω