Yamaha ARIUS YDP-162B, Service Manual

Page: 43 / 88

YDP-162B/YDP-162C/YDP-162R/YDP-162PE
43
DM CIRCUIT BOARD CHECK METHOD
The DM Circuit Board is provided with test points for service check purposes.
Check the test points on the DM Circuit Board if the following symptoms appear.
Symptoms and check items
1) The power indicator not lit with Power SW ON ⇒ Check items ① to ⑦ sequentially
2) No sound or distorted sound ⇒ Check items ① , ② , ③ , ⑤ , ⑧ and ⑨ and OUTPUT check items.
TEST POINT
NO. Test Point Circuit Judgment criteria Measured by Parts with possible defects
① +B Power supply for DM circuit board More than 15.0 V Multimeter
TR3 or TH1
(On DCPJ Circuit Board)
② PVCC Poper Supply for Power Amplifier More than 15.0 V Multimeter L101
③ +5V
5 V power for digital circuit 5.0 V ±0.2 V Multimeter IC2
④ +3.3D 3.3 V power for digital circuit 3.3 V ±0.1 V Multimeter IC3
⑤ +3.3A
3.3V power for analog circuit 3.3 V ±0.1 V with AGND Multimeter L6
⑥ +1.2D 1.2V power for digital circuit 1.2 V ±0.1 V Multimeter IC5
⑦ ‒RESET
CPU & memory reset signal 3.3 V ±0.3 V Multimeter IC401
⑧ DAC-L
DAC output L channel
There shall be audio output
without distortion.
Signal Checker IC101 or IC102
⑨ DAC-R DAC output R channel
There shall be audio output
without distortion.
Signal Checker IC101 or IC102
Note1: Use the standard AC adapter PA-300C for check operation.
Note2: It measures by opposite DGND except special notes.
Output
NO.
SPEAKER
OUTPUT
PHONES/
OUTPUT
DAC-L/R
TEST POINT
Parts with possible defects
1 × × × IC101
2
× × ○
IC101 or Error Detect
3 ○ × × IC102
4
× ○ ○
IC101, IC103 or HP JACK
5 ○ × ○ IC151 or HP JACK
Note1: “O” mark expresses normalcy and “x” mark expresses a fieled state.
③
② ⑤ ⑧ ⑨
④ ⑥ ① ⑦
DM Circuit Board
(ZE299000)