Denon PMA-50, Service Manual

Page: 38 / 93

2.4. USB In
Check Power Supply Voltages for USB IC.
MAIN PCB
[IC110] : +1.2V
[IC141] : +1.8V
[IC162] : +3.3V
Check Digital Audio Data from USB.
MAIN PCB
[IC101] : See Waveforms.
OK
OK
Check the soldering, replace each device or MAIN PCB.
[IC304] : IN:+3.3V / OUT:+1.2V
[IC303] : IN:+3.3V / OUT:+1.8V
[Q310] : IN:+3.3V / OUT:+3.3V
Check the soldering or replace the MAIN PCB.
NG
NG
to 2.1. COMMON(signal)
2.5. Blutooth In
Check Power Supply Voltages for BT Module.
FRONT PCB
[FPC502] : 7pin +3.3V
[IC501] : 7pin +3.3V
[IC501] : 36pin +1.8V
Check Digital Audio Data from BT IC.
BT PCB
[IC501] : 30pin SPDIF_OUT
OK
OK
Check the soldering or replace each device.
[Q311] : 5 or 6pin +3.3V on MAIN PCB
[IC502] : 5pin + 1.8V on FRONT PCB
Check the soldering, replace each device or FRONT
PCB.
[FPC502] on BT PCB
NG
NG
to 2.1. COMMON(signal)
2.6. Optical / Coaxial In
Check S/PDIF signal to DIR
MAIN PCB
[IC204] : 4pin Optical 1
[IC204] : 6pin Optical 2
[IC204] : 37pin Coaxial
OK
Check the soldering or replace each device.
[JK801] on MAIN PCB.
[JK800] on MAIN PCB.
[JK802] on MAIN PCB.
[JK806] on MAIN PCB.
NG
to 2.1. COMMON(signal)
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