Pioneer PRO-R06U Training Manual page 46

No sound from the subwoofer
No sound from the
subwoofer
Yes
Is the sound muting set?
No
Is the volume set to "0"?
No
Is a signal output from
IC4801?
(pin 31), (pin 32)
Yes
Is a signal output from
IC4701?
(pin 1), (pin 7)
Yes
Has the signal arrived at
TP4703?
Yes
Check around the pinjack.
Yes Cancel muting then check
again.
Yes Raise the volume then
check again.
No
Check around IC4801 and
each input signal.
No
Check around IC4701.
No
Check around Q4704 and
R4710.
DTB (Digital Terrestrial Board) doesn't operate
DTB (Digital Terrestrial
Board) doesn't operate.
Yes
Is the power-supply voltage
of CN102 normal?
Yes
When the power is turned
on, is DTB_RESET (Pin 38
of CN1402) high after the
voltage D+3.3V rises?
Yes
Are TXDA (pin 3) and RXDA
(pin 2) of CN3102
communicating?
Yes
Is a signal input from DTB to
IC6601?
Yes
Has the symptom been
settled when the MR MAIN
BOARD Assy is replaced?
Yes
Finishing troubleshooting
46
Check between CN102 and
No
CN3301.
Replace DTB if there is no
problem.
Check between CN1402-pin
No 38 and CN4005-pin 38.
Check between CN4005-pin
38 and IC5206-pin 159.
Exchange DTB if there is no
problem.
No
Check between CN3102-
pins 2, 3 and CN4004-pins
2, 3.
Exchange DTB if there is no
problem.
Check between CN3102 and
No
CN4004. Check between
CN4004 and IC6601.
Exchange DTB if there is no
problem.
No
The panel is defective.