Electrical Checks - Sony HCD-ZUX999 Service Manual

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
SECTION 4

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 TUNE LEVEL CHECK
signal
generator
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Use 75 ohm coaxial cable to connect signal generator and the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confi rm "TUNED" is lit on the display for A, B and C signals.
When the selected station signal is received in good condition,
"TUNED" is displayed.
HCD-ZUX999
TP216
(RFACO)
set
27