Sony MHC-V42D Service Manual

MHC-V42D
23
SECTION 4
ELECTRICAL CHECK
Procedure:
1. Turn the power on.
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: 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rmthatinputFrequencyofA,BandCdetectedand
automatic scanning stops.
The stop of automatic scanning means “The station signal is
received in good condition”.
FOCUS BIAS CHECK
+
–
MOTHERBOARD board
oscilloscope
(DC range)
CN302 pin 17 (RF)
CN302 pin 1 (GND)
Procedure:
1. Connect the oscilloscope to CN302 pin 17 (RF) and CN302
pin 1 (GND) on the MOTHERBOARD board.
2. Press the [
1
] button to turn the power on, and press the
[FUNCTION] button to select CD/DVD function.
3. Set the test disc (CD: YEDS-18) on the tray and press [B]
button to playback.
4. Conrmthatoscilloscopewaveformisasshowninthegure
below (eye pattern).
A good eye pattern means that the diamond shape (◊) in the
center of the waveform can be clearly distinguished.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.1 ± 0.25 Vp-p (DVDSL)
1.0 ± 0.25 Vp-p (CD)
FM AUTO STOP CHECK
signal
generator
set
+
–
75
TUNER SECTION
0 dB = 1 μV
Checking Location:
– MOTHERBOARD Board (Component Side) –
CN302
pin 17 (RF)pin 1 (GND)
IC109
IC2001
SYSSET
2019/03/0500:47:46(GMT+09:00)

Sony MHC-V42D Specifications

General

Speaker type	-
Speaker placement	Floor
Built-in amplifier	Yes
Number of woofer drivers	1
Number of tweeter drivers	2
Type	Home audio mini system
Control type	Buttons, Rotary
Cassette deck	No
Product color	Black
Disc loading type	Tray
Number of optical discs	1 discs
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Quantity per pack	1 pc(s)
RMS rated power	- W
Woofer diameter	250 mm
Tweeter diameter	40 mm
Mid-range driver diameter	80 mm
Coloration	Monochromatic
Bluetooth profiles	A2DP, AVRCP, SPP
Illumination location	Front
Volume control	Digital
Power source	Battery
FM band range	87.5 - 108 MHz
Supported radio bands	FM
Preset stations quantity	20
Recording on	USB
Playback modes	Normal, Repeat, Shuffle
Playback disc formats	CD audio, DVD-Audio, VCD
Audio formats supported	AAC, MP3, WAV, WMA
Video formats supported	MPEG1, MPEG4, XVID

Weight and Dimensions

Depth	300 mm
Width	328 mm
Height	799 mm
Weight	12600 g