Sony GigaJuke NAS-E35HD, Service Manual

Page: 20 / 100

NAS-E35HD/SS-CE35HD
20
SECTION 5
ELECTRICAL CHECKS
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 M
Ω
impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than speci fi ed value with the following checks.
RF LEVEL CHECK
TP216 (RFACO)
CD board
oscilloscope
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. Con
fi 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
VOLT/DIV : 200 mV
TIME/DIV : 500 ns
level : 1.1 ± 0.3 Vp-p
E-F BALANCE (1 TRACK JUMP) CHECK
TP3 (TEI)
TP5 (VC)
CD board
oscilloscope
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. Con
fi rm that the level B and A (DC voltage) on the oscillo-
scope waveform.
level = 1.3 ± 0.6 Vp-p symmetry
A (DC voltage)
center of
waveform
B
DVC
1 track jump waveform
CD SECTION
Connecting and Adjustment Location: CD board
TP3
(TEI) TP5
(VC) TP216
(RFACO)
– CD BOARD (CONDUCTOR SIDE) –
TUNER SECTION
FM AUTO STOP CHECK
generator
SET
+
75
Ω
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. Con fi 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”.