CD-DP2500 (serv.man26). Adjustments - Sharp Audio Service Manual (repair manual)

cd-dp2500 (serv.man26) service manual
Model
CD-DP2500 (serv.man26)
Pages
3 Few pages! See other manuals at the bottom of the first or last page.
Size
63.59 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio / System / Adjustments
File
cd-dp2500-sm26.pdf
Date

Read Sharp CD-DP2500 (serv.man26) Service Manual online

– 15 –
CD-DP2500H
How to remove the pickup (See Fig. 15-2)
1. Remove the stop washer (B1) x 1 pc., to remove the gear
(B2).
2. Remove the screws (B3) x 2 pcs., to remove the shaft (B4).
3. Remove the pickup.
Figure 15-2
CD MECHANISM SECTION
Perform steps 1, 2, 3, and 13 to 15 of the disassembly method
to remove the CD mechanism.
How to remove the loading motor
(See Fig. 15-1)
1. Bend the hooks (A1) x 5 pcs., to remove the loading motor.
Figure 15-1
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.
(A1)x2
(A1)x1
Loading Motor
CD Base
(A1)x2
(B1) x2
  ø2.6 x6mm
Shaft
(B2) x1
Stop Washer
(B3) x1
Gear
(B4) x1
CD Mechanism
Pickup
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 
±
Speaker
speed
Resistor in
30 Hz
terminal
motor.
(Load
(MM1)
resistance:
6 ohms)
 Tape Speed
Figure 15-3
TAPE MECHANISM
Motor
Variable Resistor in motor
CD-DP2500H
– 16 –
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-renge frequency
AM IF
450 kHz
1,620 kHz
T351
*1
AM Band
522 kHz
(fL): T306
*2
Coverage
1.1 
±
 0.1 V
AM Tracking 990 kHz
990 kHz
(fL): T303
*1
Figure 16-1 ADJUSTMENT POINT
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
Figure 16-2
CD ERROR CODE DESCRIPTION
Error
State Code
[Servo System Error]
0001
Cannot detect Pickup-in SW
0002
DSP access error
[Error during close operation]
0101
Open/Close SW not functioning (Low 
 High)
0103
Open/Close SW not functioning (High 
 Low)
[Error during open operation]
0201
Open/Close SW not functioning (Low 
 High)
0203
Open/Close SW not functioning (High 
 Low)
[Error during skip operation]
0302
Pickup-in SW is not detected
0306
During Disc 1 search, Open/Close SW or Clamp SW
or Disc SW do not change to low.
0307
Clamp SW not function (Low 
 High)
0308
Clamp SW not function (High 
 Low)
Since this CD system incorporates the following automatic
adjustment functions, readjustment is not needed when
replacing the pickup. Therefore, different PWBs and pickups
can be combined freely.
Each time a disc is changed, these adjustments are
performed automatically. Therefore, playback of each disc
can be performed under optimum conditions.
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 14-2
EFBL)
(3) Gain adjustment (The gain is compensated inside the IC
so that the loop gain at the gain crossover frequency will
be 0dB.)
  * Focus gain adjustment
  * Tracking gain adjustment
  Adjustment
T
T
EFBL
FDO
TE
Stopped
CH1=500mV
DC   10:1
CH2=200mV
DC   10:1
CH3=1V
DC   10:1
500ms/div
(500ms/div)
NORM:20kS/s
1
2
3
=Record Length=
Smoothing :   ON
CH1  :      0.000V
CH2  :      0.000V
Main  :     100K
Zoom  :       2k
Mode  :   SINGLE
Type   :   EDGE CH1
Delay  :                    0.0ns
Hold off  :                0.2us
CH3  :        0.00V
CH4  :        0.00V
BW   : FULL
=Trigger=
=Filter=
=Offset=
CH2
  v/DIV
   200mV
1999/04/05  20:26:47
T303
CF301
T351
CF352
CF351
CF302
IC303
T306
IC302
FE301
CNP301
 SO301
FM75 ohms
 AM LOOP
ANTENNA
MAIN PWB
AM Tracking
AM Band Coverage
AM IF
TP301
TP302
– 17 –
CD-DP2500H
SP out
L-ch
Input signal is output.
(SO901)
R-ch
Input signal is output.
(SO901) SP out C-ch
SP cut, no output
(SO901) SP out S-ch
Almost no output (only omitting component)
SP out
L-ch
Almost no output (only omitting component)
(SO901)
R-ch
Almost no output (only omitting component)
(SO901) SP out C-ch Input signal is output.
(SO901) SP out S-ch
Almost no output (only omitting component)
               State of set Dolby Pro Logic
Dolby Pro Logic On mode
Output point
                  Bypass mode
Normal mode
Phantom mode
IC501
1 pin L-out
Output enabled state
Output enabled state
Output enabled state
2 pin R-out
Output enabled state
Output enabled state
Output enabled state
IC501
 3pin C-out
No output
Output enabled state
No output
IC501
9pin  S-out
No output
Output enabled state
Output enabled state
SP OUT
L-ch
Output enabled state
Output enabled state
Output enabled state
(SO901)
R-ch
Output enabled state
Output enabled state
Output enabled state
 SP OUT C-ch
No output in MUTE (Q501) state
Output enabled state
No output in MUTE (Q501) state
(SO901)
SP OUT S-ch
No output in MUTE (Q502) state
Output enabled state
Output enabled state
(SO901)
EXPLANATION OF DOLBY SURROUND PRO LOGIC AND EVALUATION METHOD
Test tone output
• Pro Logic ON Normal mode
   Press the remote control TEST TONE button.
      
 →
Output of only L-ch
 →
Output of only C-ch
   
 ↑
                                                                    ↓
          Output of only S-ch 
 Output of only R-ch
   The test tone (noise) is repeatedly output for output period
   (2 sec).
   In this case the following indication appears repeatedly.
      
 →
TEST
 →
L-ch
 →
C-ch
                
  ↑
                ↓
            
S-ch
 ←
 R-ch
• Pro Logic ON Phantom mode
   Press the remote control TEST TONE button.
      
 →
Output of only L-ch
 →
Output of only R-ch
                
                    ↑
                                    ↓
                                        
 Output of only S-ch
   The test tone (noise) is repeatedly output for output period
   (2 sec).
   In this case the following indication appears repeatedly.
    
TEST 
→ 
L-ch 
→ 
R-ch
                      
 
           
                       
 S-ch
Outline
• Namely, two speakers are connected in parallel to one
amplifier.
• In the Pro Logic BYPASS mode the amplifier for C-ch (center
channel) and the amplifier for S-ch (surround channel) are in
MUTE state. The SP output is cut.
• In the normal mode of Pro Logic ON mode the amplifiers for
C-ch and S-ch are in operative state, so that the SP output
appears.
• In the Phantom mode of Pro Logic ON mode the amplifier for
C-ch is in MUTE state, so that the SP output is cut. The
amplifier for S-ch (surround) is in operative state, so that the
SP output appears
 
State of element output and terminal output in specific mode
Relation between VIDEO IN input and output in Pro Logic
ON state
(1) L-ch/R-ch same phase input into VIDEO IN input jack in
VIDEO Function mode
Output point
Normal mode
Output point
Phantom mode
(2) L-ch/R-ch reverse phase input into VIDEO IN input jack in
VIDEO Function mode
(Reverse phase: Phase difference between L and R is 180
°
)
Output point
Normal mode
SP out
L-ch
Almost no output (only omitting component)
(SO901)
R-ch
Almost no output (only omitting component)
(SO901) SP out C-ch
Almost no output (only omitting component)
(SO901) SP out S-ch
Input signal is output.
Output point
Phantom mode
SP out
L-ch
Almost no output (only omitting component)
(SO901)
R-ch
Almost no output (only omitting component)
(SO901) SP out C-ch
SP cut, no output
(SO901) SP out S-ch
Input signal is output.
• Accordingly, if you want to output signal waveform to C-ch SP
out, give the same phase input into L-ch/R-ch INPUT in the
Pro Logic Normal mode.
   If one of channels receives input, C-ch does not output.  Only
L-ch or R-ch outputs.
• If you want to output signal waveform to S-ch SP out, you can
use either Normal mode or Phantom mode.  However, 180
°
reverse phase input must be given to L-ch/R-ch INPUT.
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Here you can read online and download Sharp CD-DP2500 (serv.man26) Service Manual in PDF. CD-DP2500 (serv.man26) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp CD-DP2500 (serv.man26) System. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.