Service manual

MZ-NH900
2626
MZ-NH900
• Note For Printed Wiring Boards and Schematic Diagrams
• MAIN board is multi-layer printed board.
However, the patterns of intermediate-layer have not been in-
cluded in this diagrams.
• Lead Layouts
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1
/
4
W or less unless otherwise
specified.
• f : internal component.
• C : panel designation.
• A : B+ Line.
• Total current is measured with MD installed.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground in
playback mode.
no mark : PLAYBACK
∗ : Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
E : PLAYBACK
j : REC
J : OPTICAL IN
F : LINE IN
d : USB input from PC
G : USB output to PC
N : MIC IN
• Abbreviation
EE : East European model
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• f : internal component.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
surfac
e
Lead layout of conventional IC CSP (chip size package)
• Waveforms
500 mV/DIV, 500 ns/DIV
1
IC501 ra (FE)
(MD Play Mode)
2
IC501 rs (TE)
(MD Play Mode)
3
IC801 <zb, (FS4)
4
IC801 <zmv (FS256_OUT)
5
IC801 <czz (OSCO)
6
100 mV/DIV, 500 ns/DIV
200 mV/DIV, 500 ns/DIV
1 mV/DIV, 50 ns/DIV
1 mV/DIV, 2 µ s/DIV
1 V/DIV, 20 ns/DIV
1.0 Vp-p
Approx.
280 mVp-p
Approx.
100 mVp-p
88 ns
2.6 Vp-p
5.7 µ s
2.3 Vp-p
44 ns
2.6 Vp-p
IC301 8 (BCLK)
1 V/DIV, 100 ns/DIV
7
IC301 9 (MCLK)
8
IC301 q; (LRCK)
9
1 V/DIV, 50 ns/DIV
1 V/DIV, 10 µ s/DIV
354 ns
2.2 Vp-p
88 ns
2.5 Vp-p
22.8 µ s
2.3 Vp-p
Note:
The components identi-
fied by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro
spécifié.
IC501 8 (RFO)
(MD Play Mode)