Descriptions On Test Points Of The Dm Circuit Board - Yamaha n8 Service Manual

DESCRIPTIONS ON TEST POINTS OF THE DM CIRCUIT BOARD

Contents of test points set up on the soldered surface (the surface which is visible when the bottom cover is opened) of the DM circuit
board for the n8 and n12. (See page 139 for overall view)
Signal Test point PWB
type No. indication
Power supply
voltage
TL200 +1.8 V
TL201 -5 V
TL202 +3.3 V
TL203 +5 VD
TL204 +1.5 V
TL258 DGND
TL205 +15 VD
TL206 +15 VA
TL207 -15 VA
TL208 +5 VA
TL259 VSS
TL260 AGND
A/D input
TL209
ADI1
TL210
TL211
ADI2
TL212
TL213
ADI3
TL214
TL215
ADI4
TL216
TL217
ADI5
TL218
TL219
ADI6
TL220
TL221
ADI7
TL222
TL223
ADI8
TL224
TL225
ADI9
TL226
TL227
ADI10
TL228
TL229
ADI11
TL230
TL231
ADI12
TL232
Signal
name
+1.8 V power for the CPU core of the SSP1. Produced from the +3.3
+1.8 V
V at the DC/DC converter (IC101).
-5 V power for the Op-Amp of the PN, PNSB circuit board.
-5.0 V
Produced from the +5 V at the DC/DC converter (IC188).
+3.3 V Digital circuit system +3.3 V power. Provided by the PS circuit board. +3.3 V ±5 %
+5.0 V Digital circuit system +5 V power. Provided by the PS circuit board. +5.0 V ±5 %
+1.5 V power for the Talkback microphone Phantom. Produced with
+1.5 V
resistive potential divider from the analog system +15 V.
D.GND Digital circuit system GND.
+15 VD Power for the audio system A/D, D/A. Provided by the PS circuit board. +15 V ±5 %
+15 V power for the audio system Op-Amp. Provided by the PS
+15 VA
circuit board.
-15 V power for the audio system Op-Amp. Provided by the PS
-15 VA
circuit board.
Power for the audio system A/D, D/A. From the +15 VD, turned +6 V
+5 VA by the DC/DC converter (IC127) and turned +5 V by the 3-terminal
regulator (IC187).
VSS GND for the audio system A/D, D/A.
A.GND GND for the audio system Op-Amp.
ADI[1]-(+) A/D converter input hot side of INPUT CH1.
A/D converter input cold side of INPUT CH1
ADI[1]-(-)
(phase opposite to the hot side phase).
ADI[2]-(+) A/D converter input hot side of INPUT CH2.
A/D converter input cold side of INPUT CH2
ADI[2]-(-)
(phase opposite to the hot side phase).
ADI[3]-(+) A/D converter input hot side of INPUT CH3.
A/D converter input cold side of INPUT CH3
ADI[3]-(-)
(phase opposite to the hot side phase).
ADI[4]-(+) A/D converter input hot side of INPUT CH4.
A/D converter input cold side of INPUT CH4
ADI[4]-(-)
(phase opposite to the hot side phase).
ADI[5]-(+) A/D converter input hot side of INPUT CH5. * n12 only
A/D converter input cold side of INPUT CH5
ADI[5]-(-)
(phase opposite to the hot side phase). * n12 only
ADI[6]-(+) A/D converter input hot side of INPUT CH6. * n12 only
A/D converter input cold side of INPUT CH6
ADI[6]-(-)
(phase opposite to the hot side phase). * n12 only
ADI[7]-(+) A/D converter input hot side of INPUT CH7. * n12 only
A/D converter input cold side of INPUT CH7
ADI[7]-(-)
(phase opposite to the hot side phase). * n12 only
ADI[8]-(+) A/D converter input hot side of INPUT CH8. * n12 only
A/D converter input cold side of INPUT CH8
ADI[8]-(-)
(phase opposite to the hot side phase). * n12 only
ADI[9]-(+) A/D converter input hot side of INPUT CH9. * CH5 on n8
A/D converter input cold side of INPUT CH9
ADI[9]-(-)
(phase opposite to the hot side phase). * CH5 on n8
ADI[10]-(+) A/D converter input hot side of INPUT CH10. * CH6 on n8
A/D converter input cold side of INPUT CH10
ADI[10]-(-)
(phase opposite to the hot side phase) * CH6 on n8
ADI[11]-(+) A/D converter input hot side of INPUT CH11. * CH7 on n8
A/D converter input cold side of INPUT CH11
ADI[11]-(-)
(phase opposite to the hot side phase). * CH7 on n8
ADI[12]-(+) A/D converter input hot side of INPUT CH12. * CH8 on n8
A/D converter input cold side of INPUT CH12
ADI[12]-(-)
(phase opposite to the hot side phase). * CH8 on n8
Description
n8/n12
Electric Reference
specifi cations GND
+1.8 V ±3 % DGND
-4.275 V to -5.25 V DGND
DGND
DGND
+1.5 V +5 %/-8 % AGND
–
VSS
+15 V ±5 % AGND
-15 V ±5 % AGND
+5.0 V ±2 % VSS
–
–
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
Full-scale input: 2.9 Vp-p AGND
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