Pioneer A-70DA-K Service Manual page 13

5
4) No sound (USB input, COAXIAL/OPTICAL input )
No sound (USB input) No sound (COAXIAL/OPTICAL input)
Is the COAXIAL
input normally ?

After the signal changing with USB it judges that it is normal.
It judges that signal change route before that it is abnormal.

IC62,IC64: failure or check of the peripheral circuit and
power supply
Is there a data
at IC72 : 5,6 pins ?
Is there problem in the IC72 ?

X751 12MHz oscillation

Check of the D+3.3_USBSW

Is there a data at 86,87,
88 pins

IC63,IC65,IC66,IC67 solder
failure or failure or check of
the power supply
5) No sound (HEADPHONE)
No sound (HEADPHONE)
Is R1242(HP_DET)
set to " L " ?
Is R200(RELEY_HP)
IC11 solder failure or failure
set to " H " ?
RL51 solder failure or failure
Is there signal at
Check of the power supply
CN83 : 19,21 pins ?
21p FFC connection failure
CN83(USB ASSY, FRONT ASSY) : solder failure

Connection failure between BN88 and CN88
JK81 solder failure or failure
5
6
Is there problem in the IC2701
(DAC IC) ?


Is the USB

input normally ?



Check the connection and setting to the PC
Is USBDPON
set to " H " ?
Is the voltage of
D+3.3_USB at 3.3V ?

IC68 failure
[Status of product]
 Insert AC Power cord
 Main unit POWER SW: ON
 POWER ON operation by remote control unit
 Select SPEAKER-A
 INPUT : No specify otherwise
Is BN88 :1pin
Is R1257(HP_DET)
(HP_DET) set to
set to " L " ?
R1242,R1257 : Q813,R880 :
solder failure or failure solder failure or failure
(C517 is between plus and minus : aprrox. 10V)
6
7
X2701 100MHz oscillation
Check of the power supply
Check of the 16,17pins
(communication pin)
Check of the 7 pin(RESET pin)
Is there a data at 44,45,46 pins

Check the signal line between
IC2706:1 pin and IC2302:31 pin

Check the signal line between
IC2706:7 pin and IC2302:2 pin

Connection failure between BN61 and CN2011

Resistance on the USBDPON line : solder
failure or failure
Is the voltage of
IC76 : 1 pin at 5V ?

IC76 failure

XDOFF control failure
JK81 solder failure and failure

Connection failure between
" H " ?
BN88, CN88 : solder failure
A-70DA-K
7
8
Is there a signal
at IC2701:1,2 pins
(DAC IC) ?

IC2701 failure
Is there a Lch signal at
IC2501:1 pin,
IC2706:1 pin ?
Is there a Rch signal at
IC2601:1 pin,
IC2706:7 pin ?

IC2501,IC2601,IC2706: failure or
check of the power supply

Connection failure between BN12 and CN2012

Connection failure between CN4000 and CN2017

Connection failure between BN94 and CN4100

IC92 failure
BN88 and CN88
8
YES A
NO
B
C
D
E
F
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