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SERVICE MANUAL
CD-P1850
COMPACT DISC PLAYER
For Europe
Effective : February, 2002 S-0050A
1 SPECIFICATIONS
CONTENTS CD PLAYER
Pickup:
1 SPECIFICATIONS 2
3-beam, semiconductor laser
2 EXPLODED VIEWS AND PARTS LIST 3
D/A Converter:
3 PC BOARDS AND PARTS LIST 7
1 bit DAC
4 INCLUDED ACCESSORIES 11
Digital filter:
5 BLOCK DIAGRAM 12
8-times oversampling
Frequency Response:
20 Hz ~ 20 kHz ±1.5dB
Total Harmonic Distortion:
NOTES < 0.02 % (1 kHz)
Signal-to-Noise Ratio (S/N):
PC boards shown are viewed from parts side.
>85 dB (1 kHz)
The parts with no reference number or no parts number in the
Channel Separation:
exploded views are not supplied.
>80 dB (1 kHz)
As regards the resistors and capacitors, refer to the circuit diagrams
Output:
contained in this manual.
Analog; 2.0 Vrms (RCA)
£ Parts marked with this sign are safety critical components. They
Digital; TOS OPTICAL
must be replaced with identical components - refer to the
Wow and Flutter:
appropriate parts list and ensure exact replacement.
Below measurable limit
Parts of [ ] mark can be used only with the version designated.
GENERAL
Power Requirements:
230 VAC, 50Hz (UK/Europe Model)
240 VAC, 50Hz (Australia Model)
Power Consumption:
12 Watts (AC)
Dimensions (W x H x D):
435 x 104 x 290mm
(17-1/8" x 4-1/8" x 11-7/16")
Net Weight:
3.6 kg
Standard Accessories:
Wireless Remote Control Unit (RC-682)
RCA pin-plug cord
Battery (SUM-3, "AA", "R6" type) x 2
· Design and specifications are subject to change without notice.
2
2 EXPLODED VIEWS AND PARTS LIST
EXPLODED VIEW-1
3
EXPLODED VIEW-1
£
£
£
4
EXPLODED VIEW-2
5
EXPLODED VIEW-2 (CD93F8NDT)
6
3 PC BOARDS AND PARTS LIST
MAIN PCB
7
DISPLAY PCB
KEYSW PCB
8
HP PCB
POWER PCB
9
MAIN PCB ASSY KEYSW PCB ASSY
£
H.P. PCB ASSY
£
£ POWER PCB ASSY
£
£
£
£
£
£
£
£
£
DISPLAY PCB ASSY
10
4 INCLUDED ACCESSORIES
INCLUDED ACCESSORIES
11
5 BLOCK DIAGRAM
MAIN Circuit
MECHA ASP&DSP DF+DAC
DA11T3CN UPD63711 PCM1710
DRIVER LPF (Dif Amp) H.P. OUT
BA5813FM NJM2068D
OP/CL MICOM RCA OUT
M UPD789026
DAC Circuit
POWER Circuit
POWER AC POWER DC DIGI OUT
DISPLAY Circuit
DISPLAY DRIVER IR.REM KEY
FLT UPD16312 25 KEY
12
SCHEMATIC DIAGRAM CD-P1850 MAIN PCB, HEADPHONE PCB, MECHA
1 2 3 4 5 6 7 8
MECHA CD93F8NDT
MAIN PCB HEAD PHONE PCB
DOUT
S02 OP/CL
GND
GND
REM
-24V
VDD
CLK
STB
DIN
PH5 CN101
R403 100K
F
F
CL SW
1 1
COM C401
2 2 IC401A
OP SW CN104 10/16 C403
10
11
8
3 3 R401 0 NJM4556
1
2
3
4
5
6
7
8
9
TM+ PH11
1
3 220/16
4 4 R133 R409 33
TM- 1
A
+
+
5 5
27K 2
+ PH5 2
R134
4
M03 P401
7.5K 50K-A R405 10K
TRAY MOTOR
CN106 CN401 R407 5.6K
- PH5
R126 100K
R127 100K
R128 100K
3
PH5
R130 10K R404 100K
LCH 1 1
C402
R131 10K RCH 2 2
10/16 IC401B C404
R402 0
14
13
12
11
10
+ C141 +8V 3 3 NJM4556
9
8
7
6
5
4
3
2
1
1
5 220/16
GND 4 4 R410 33
220/10 7 JK401
+
DRIVE MECHA DA11T3CN
+
6 PHONEJACK STEREO
X301
11
10
MUTE1 LOW
SD IN
SD OUT-
LO F OUT
PREVcc 8V
MD IN
LO F IN
SD OUT+
LO R IN
LO V CON
MUTE2 LOW POWVcc 5V
MD OUT+
MD OUT-
LO R OUT
9
8
7
6
5
4
3
2
1
TO HEADPHONE 2
5.00MHz
C405 C406
+ PH6 CN102 R140 P401 1000P 1000P
A-MUTE
P11
P12
P40/KR0
P41/KR1
P42/KR2
P43/KR3
P44/KR4
P45/KR5
P46/KR6
P47/KR7
SP+ 18K 50K-A
1 1 +
M01 SP- IC102
2 2 R406 10K C408 C410
SM+ BA5813FM
+
POWVcc 5V
3 3
3
SM- 12 44 C407 1/50
VBG OUT
4 4 NC P13 R408 5.6K R411 10K 100/10
FD OUT+
TD OUT+
FD OUT-
TD OUT-
- PU SW 13 43 100/10
+
5 5 IC L-PITCH
VBG+
PU SW 14 42 CHASISS
TD IN
FD IN
RVcc
GND
GND
BIAS
6 6 X2 L-CUE R412 12K
SPINDLE MOTOR 15 41 EARTH
X1 TM-
PH6 16 40
VSS0 IC103 TM+
17 39
VDD0 UPD789026 VSS1
+ 18 38
15
16
17
18
19
20
21
22
23
24
25
26
27
28
RESET VDD1
19 37