Yamaha N12 - n12 Digital Mixing Studio, Service Manual

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TL253 256FS 256Fs
Master clock for A/D, D/A converter.
* Provided by the MLAN circuit board. 256-fold of sampling frequency
3.3 Vp-p
DGND
TL254 64FS 64Fs
Bit clock for A/D, D/A converter.
* Provided by the MLAN circuit board. 64-fold of sampling frequency
3.3 Vp-p
DGND
TL255 WCK WordClock
Word clock for A/D, D/A converter.
* Provided by the MLAN circuit board. 1-fold of sampling frequency
3.3 Vp-p
DGND
Mute control
TL256 L: MUTE
ANALOG-
MUTE Mute circuit control signal for audio output (STEREO, C-R, AUX,
PHONES). Mute ON with “L”
level (0 V)
DGND
TL257
L: MUTE-
REQ
ALL-MUTE
Mute control signal for the whole audio signals.
Controlled by the MLAN circuit board. Mute ON with “L”
level (0 V)
DGND
* Refer to “DETAIL VIEW OF DM CIRCUIT BOARD TEST POINTS” (page 27 in circuit diagram) for details of test
points.
1. Checking power supply voltage
q +1.8 V: Core voltage of SSP1 (IC107, IC110).
Voltage of +1.8 V ±3 % should be detected at TL200 (+1.8 V) compared to TL258 (DGND).
(The above presupposes that the +3.3 V in
e
is at normal voltage.)
w -5.0 V: Power supply voltage of Op-Amp for VR voltage output of panel.
Voltage of -4.275 V to -5.25 V should be detected at TL201 (-5 V) compared to TL258 (DGND).
(The above presupposes that the +5.0 V in
r
is at normal voltage.)
e +3.3 V: Power supply voltage of digital circuits (including digital parts of A/D converter and D/A converter).
Voltage of +3.3 V ±5 % should be detected at TL202 (+3.3 V) compared to TL258 (DGND).
r +5.0 V: Power supply voltage of digital circuits (including Op-Amp for VR voltage output of panel).
Voltage of +5.0 V ±5 % should be detected at TL203 (+5 VD) compared to TL258 (DGND).
t +1.5 V: Phantom power supply voltage for talkback microphone.
Voltage of +1.5 V +5 %/-8 % should be detected at TL204 (+1.5 V) compared to TL260 (AGND).
(The above presupposes that the +15 VA in
u
is at normal voltage.)
y +15 VD: Power supply voltage for analog 5 V of A/D converter, D/A converter.
Voltage of +15 V ±5 % should be detected at TL205 (+15 VD) compared to TL259 (VSS).
u +15 VA: Power supply voltage of analog circuit (mainly, Op-Amp).
Voltage of +15 V ±5 % should be detected at TL206 (+15 VA) compared to TL260 (AGND).
i -15 VA: Power supply voltage of analog circuit (mainly, Op-Amp).
Voltage of -15 V ±5 % should be detected at TL207 (-15 VA) compared to TL260 (AGND).
o +5VA: Power supply voltage for A/D converter and D/A converter produced by +15 VD in y .
Voltage of +5 V ±2 % should be detected at TL208 (+5 VA) compared to TL259 (VSS).
(The above presupposes that the +15 VD in
y
is at normal voltage.)
TL202
TL203 TL200
TL258
TL201