DOWNLOAD Sharp CD-DP900 (serv.man16) Service Manual ↓ Size: 57.77 KB | Pages: 2 in PDF or view online for FREE

Model
CD-DP900 (serv.man16)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
57.77 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio / System / Adjustments
File
cd-dp900-sm16.pdf
Date

Sharp CD-DP900 (serv.man16) Service Manual ▷ View online

CD-DP900H/E
– 16 –
How to remove the pickup (See Fig. 16-2)
1. Remove the stop washer (B1) x 1 pc., to remove the gear
(B2) x 1 pc.
2. Remove the screws (B3) x 2 pcs., to remove the shaft
(B4) x 1 pc.
3. Remove the pickup.
Note
After removing the connector for the optical pickup from the
connector wrap the conductive aluminium foil around the front
end of connector so as to protect the optical pickup from
electrostatic damage.
Figure 16-2
CD MECHANISM SECTION
Perform steps 1, 2, 3, 11, 12,13 and 14 of the disassembly
method to remove the CD mechanism.
How to remove the loading motor
(See Fig. 16-1)
1. Bend the hooks (A1) x 5 pcs., to remove the loading motor.
Figure 16-1
ADJUSTMENT
MECHANISM SECTION
•••••
 Driving Force Check
Torque Meter
Specified Value
Play: TW-2111
Tape 1: Over 80 g
Tape 2: Over 80 g
•••••
 Torque Check
Torque Meter
Tape 2
Play: TW-2111
30 to 80 g.cm
30 to 80 g.cm
Fast forward: TW-2231
70 to 180 g.cm
Rewind: TW-2231
70 to 180 g.cm
Specified Value
Tape 1
Specified
Value
Adjusting
Point
Instrument
Connection
Test Tape
Normal
MTT-111
Variable
3,000 
±
 30 Hz
Speaker
speed
Resistor in
Terminal
motor.
(Load
resistance:
6 ohms)
•••••
 Tape Speed
Figure 16-3
(B3)x2
 ø2.6x6mm
Shaft
(B4)x1
Stop Washer
(B1)x1
Gear
(B2)x1
CD Mechanism
Pickup
TAPE MECHANISM
Tape
Motor
Variable Resistor in motor
(A1)x5
Loading
Motor PWB
Loading
Motor
Loading
Tray
– 17 –
CD-DP900H/E
Figure 17-2
CD ERROR CODE DESCRIPTION
Error
Explanation
01
When Pickup set inner position, inner switch
cannot detect 'ON' level for 10 secs.
When tray moves to Open/Close, Open/Close switch
10*
cannot detect 'ON' level for 7 secs.
When disc table rotate to target position.
Clamp switch cannot detect 'ON' level for 7 secs.
When disc table set to Disc1 position for 1 st time,
11*
"CLAMP SW", "DISC NO SW" and "OPEN/CLOSE"
cannot detect 'ON' level for 14 secs.
31
When it changes to CD function, DSP cannot read
initial data.
T
T
EFBL
FDO
TE
Stopped
CH1=500 mV
DC   10:1
CH2=200 mV
DC   10:1
CH3=1 V
DC   10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
2
3
=Record Length=
Smoothing :   ON
CH1  :      0.000 V
CH2  :      0.000 V
Main  :     100K
Zoom  :       2k
Mode  :   SINGLE
Type   :   EDGE CH1
Delay  :                    0.0 ns
Hold off  :                0.2 
µ
s
CH3  :        0.00 V
CH4  :        0.00 V
BW   : FULL
=Trigger=
=Filter=
=Offset=
CH2
  v/DIV
   200 mV
1999/04/05  20:26:47
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
CD SECTION
•••••     
 AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
*1. Input: Antenna
Output: TP302
*2. Input: Antenna
Output: TP301
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
AM IF
450 kHz
1,702 kHz
T351
*1
AM Band
530 kHz
(fL): T306
*2
Coverage
1.1 
±
 0.1 V
AM Tracking 990 kHz
990 kHz
(fL): T303
*1
Figure 17-1 ADJUSTMENT POINTS
Items adjusted automatically
(1) Offset adjustment (The offset voltage between the head
amplifier output and the VREF reference voltage is
compensated inside the IC.)
  * Focus offset adjustment
  * Tracking offset adjustment
(2) Tracking balance adjustment (waveform drawing
Fig.17-2 EFBL)
(3) Gain adjustment (The gain is compensated inside the IC
so that the loop gain at the gain crossover frequency will
be 0 dB.)
  * Focus gain adjustment
  * Tracking gain adjustment
  Adjustment
T303
CF301
T351
CF352
CF351
CF302
R357
IC303
T306
IC302
FE301
CNP301
 SO301
FM75 ohms
 AM LOOP
ANTENNA
MAIN PWB
AM Tracking
AM Band Coverage
AM IF
TP301
TP302
* 'CHECKING'
If Error is detected, 'CHECKING' will be display instead of 'ER-
CD**' display. 'ER-CD**' display will only be display when
error had been detected for the 5 th times.
Display

Sharp CD-DP900 (serv.man16) Service Manual ▷ Download

  • DOWNLOAD Sharp CD-DP900 (serv.man16) Service Manual ↓ Size: 57.77 KB | Pages: 2 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp CD-DP900 (serv.man16) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp CD-DP900 (serv.man16) System. Information contained in Sharp CD-DP900 (serv.man16) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.