36
4. AUDIO UNIT
4.1 Audio doesn't output.
Check Power supply and connection to POWER
UNIT.
・
Check the local power source, U11 (+9V),
U12(-9V), U9(+5V), U10 (+3.3V) output normally?
Check connection to MAIN UNIT (N2 : 27P FFC)
・
Input signal (audio clock and data line)
・
Check soldering and FFC cable insertion.
(N2: 27P FFC)
Check DAC output at 1st stage OP Amp.
・
U2 (MIX L), U3 (MIX R)
・
U102 (FL), U103 (FR)
・
U112 ( C ), U113 (SW )
・
U202 (SL), U203 ( SR )
・
U212 (SBL), U213 (SBR)
Check output of 2nd stage OP Amp.
・
U4 (MIX L/R )
・
U104 (FL/FR )
・
U114 ( C/SW )
・
U204 (SL/SR )
・
U214 (SBL/SBR )
Check soldering.(1st stage OP Amp and
surrounding circuitry).
Check soldering (2nd stage OP Amp and surrounding
circuitry).
Check data signal to Each DAC.
U1: DAC for MIX. 2ch L/R 4, 5, 6, 7pin *IIS format
4pin
LRCK (=fs rate)
5pin
DATA
6pin
BCK (=64 fs rate)
7pin
SCK (MCK, rated 256, 384, 512 fs)
Same applies to other channel (U101 FL/FR,
U111 C/SW, U201 SL/SR, U211 SBL, SBR)
Check soldering (MUTE and surrounding circuitry).
MUTE Transistors (Q2-5, Q8-11 for MIX ch).
・
Q2-Q5, Base voltage is about -8.8V during
playback.
(Q101-104 for FL/FR ch)
(Q109-112 for C/SW ch)
(Q201-204 for SL/SR ch)
(Q209-212 for SBL/SBR ch)
・
Check soldering (DAC surrounding, and data
selecting (U5, U6, U7) and surrounding circuitry).
・
Check soldering (U9-12 surrounding).
・
Check N1
:
5P PH, 1pin (+12V), 3pin(-12V). input
from POWER UNIT.
・
Check cable insertion.
END
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Check output terminal.
・
Check output signal from each terminal.
(MIX L/R, FL/FR, C/SW, SL/SR, SBL/SBR)
Содержание DBP-2012UDCI
Страница 17: ...17 5 On the screen below select ComPort XX Select the USB 232C TTL conversion jig port 6 Check Directory ...
Страница 40: ...40 Personal notes ...
Страница 76: ...Personal notes Personal notes 76 ...
Страница 80: ...80 PACKING VIEWs 7 8 8 14 15 16 17 19 18 17 16 19 9 13 12 11 10 z 1 3 4 5 6 ...
Страница 86: ...86 LAN8710 MAIN UNIT U901 Block Diagram ...
Страница 87: ...87 NJM2566AV MAIN UNIT U20 Block Diagram ...
Страница 91: ...91 2 FL DISPLAY FL TUBE 15 BT 114GNK Display UNIT U3 ...
Страница 92: ...92 Personal notes ...