CD-C451H (serv.man17). Adjustment procedures - Sharp Audio Service Manual (repair manual)

cd-c451h (serv.man17) service manual
Model
CD-C451H (serv.man17)
Pages
7
Size
78.41 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio / System / Adjustment procedures
File
cd-c451h-sm17.pdf
Date

Read Sharp CD-C451H (serv.man17) Service Manual online

– 11 –
CD-C451H
MECHANISM SECTION
• Driving Force Check
Torque Meter
Specified Value
Play: TW-2412
Tape 1: Over 80 g
Tape 2: Over 80 g
• Torque Check
Torque Meter
Tape 2
Play: TW-2111
30 to 60 g. cm
30 to 100 g.cm
Fast forward: TW-2231
50 to 100 g.cm
Rewind: TW-2231
50 to 100 g.cm
Specified
Value
Adjusting
Point
Instrument
Connection
Test Tape
Normal
MTT-111
VRM1
3,000 ±
Speaker
speed
30 Hz
terminal
ADJUSTMENT
Specified Value
Tape 1
• Tape Speed
fL: Low-range frequency
fH: High-renge frequency
•  AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
IF
450 kHz
1,620 kHz
T351
*1
MW Band
522 kHz
(fL): T306
*2
Coverage
1.1 ± 0.1 V
MW
990 kHz
990 kHz
(fL): T302
*1
Tracking
LW Band
153 kHz
(fL): T305
*2
Coverage
1.5 ± 0.1 V
LW
225 kHz
225 kHz
(fL): T301
*1
Tracking
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
•  FM
Notes:
1: Description of the "FM IF Adjustment" is not carried on this
Manual. It is because the IF coil in the FM front end section
has been best adjusted in the factory so that its further
adjustment is not needed at the field. When replacing the
FM front end assembly, no adjustment is needed either.
2: The parts in the FM front end section are prepared in a
complete unit, so you can't obtain each part individually
Adjusting
Parts
Instrument
Connection
Frequency
Display
Frequency
•  FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
98.00 MHz
98.00 MHz
VR351
Input: Antenna
(25 dBµV)
Output: Speaker
Terminal
Figure 11 ADJUSTMENT POINTS
TUNER SECTION
*1. Input: Antenna,
Output: TP302
*2. Input: Antenna,
Output: TP301
VRM1
TAPE
SPEED
TAPE  MECHANISM  PWB
TUNER  PWB
TP301
CNP301
SO301
ANTENNA
TERMINAL
FE301
TP302
R357
T351
T306
T305
T302
T301
VR351
AM  IF
FM  MUTE
LEVEL
MW  BAND
COVERAGE
MW  
TRACKING
LW  
TRACKING
LW  BAND
COVERAGE
CD-C451H
– 12 –
TEST MODE
Figure 12-2
Figure 12-3
Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is not necessary
to readjust it.
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.
• Automatic adjustment item
1. Focus offset (Fig.12-2)
2. Tracking offset (Fig.12-3)
3. E/F balance (tracking error balance) (Fig.12-4)
4. RF level AGC function (HF level: constant)
5. RF level automatic follow-up of the tracking gain
This automatic adjustment is performed each time a disc is changed. Therefore,
 each disc is played back using the optimal settings.
CD SECTION
Figure 12-1
Note:
Only in STOP state it is possible to slide the pickup with the (
) or (
) key.
VOL. --- Last memory
BAL. --- CENTER
R.GEQ. --- FLAT
X-BAS --- OFF
Canceling method -  POWER OFF
• Setting the test mode
Any one of test mode can be set by pressing several keys as follows.
<REC. PAUSE> + <CD> + <POWER>      TEST: CD operation test
• TEST mode
Function — CD test mode
Setting of TEST mode
Indication of CD TST mode (Fig.12-1)
OPEN/CLOSE operation is manual operation.
The pickup can be moved by using the (
) or (
) key.
<MEMORY>
LASER ON
<PLAY> key input
Press <STOP> key.
Stop
TOC. IL is performed, and the ordinary PLAY is performed.
If the following key is pressed during PLAY, it is possible
to specify directly any Track No.
<Disc Number 1> key: Track 4
<Disc Number 2> key: Track 9
<Disc Number 3> key: Track 15
<MEMORY>
Tracking on the spot.
SERVO OFF PLAY
<MEMORY>
Tracking on the spot.
SERVO ON PLAY
STOP
Figure 12-4
IL is not performed.
<STOP>
2
1
10ms
0.50 V
IC1  20   FE
10ms
0.50 V
IC1  7   TE
Enlarged
View
TRACKING
OFF-SET
ADJUST
2
1
TO
TE
200 ms
1V/diV
IC 1   15
200 ms
1V/diV
IC 1    7
TRACKING/
ERROR
BARANCE
ADJUST
2
 0.1s
0.50 V
IC1  20   FE
 0.1s
0.50 V
IC1   7   TE
1
 FOCUS
OFF-SET
ADJUST
 TRACKING
OFF-SET
ADJUST
– 13 –
CD-C451H
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
12 pin L-out
Output enabled state
Output enabled state
Output enabled state
11 pin R-out Output enabled state
Output enabled state
Output enabled state
IC501
  9 pin C-out No output
Output enabled state
No output
IC501
10 pin 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 (Q604) state
Output enabled state
No output in MUTE (Q604) state
(SO901)
SP OUT S-ch
No output in MUTE (Q603) 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.
CD-C451H
– 14 –
Note:
   When the unit is in the EON stand-by mode and a pro-
gramme is selected, the unit will display "TI" instead of "TP" or
"TA".
RDS (Radio Data System) OPERATION
    Receiving FM Stations with RDS (Radio Data
    System)
RDS is a broadcasting service which a growing number of FM
stations are now providing. It allows these FM stqtions to send
additional signals along with their regular programme signals.
For example, the stations send their station names, and
information about what type of programme they broadcast,
such as sports or music, etc.
When tuned to an FM station which provide the RDS service,
the RDS will appear, the station frequency (and then the
station name if sent) is displayed.
The TP (Traffic Programme) will appear on the display when
the received broadcast carries traffic annoucements, and the
TA (Traffic Annoucement) will appear whilst a traffic
announcement is being received. EON will appear whilst the
EON (Enhanced Other Networks information) data is being
broadcast.
Note:
When the TP and TA appear at the same time, an announce-
ment is being made.
When only the TA appears, an announcement is not being
made. (See page 17.)
    Information Provided by RDS
With the CD-C451H, you can display two types of RDS
service. To show them in the display, press the DISPLAY
MODE button.
Each time you press the DISPLAY MODE button, the display
will change to show the following information.
PS (Programme Service):
Station names commonly
known will be diaplayed.
"NO PS" appears if no signal
is being sent.
PTY (Progamme Type):
Programme type will be
diplayed.
"NO PTY" appears if no
signal is being sent.
Station Frequency:
Station frequencies.
Descriptions of the PTY (Programme Type) codes, TP (Traffic
Programme) and TA (Traffic Announcement)
Eith the CD-C451H, you can search for and receive the
forrowing PTY, TP and TA signals.
NEWS:
News
AFFAIRS:
Topical programme expanding on the
current news or affairs
INFO:
Programmes on medical service, weather
forecast, etc.
EDUCATE:
Educational programmes
DRAMA:
Radio plays
CULTURE:
Programmes on national or regional culture.
SCIENCE:
Programmes on national sciences and
technology.
VARIED:
Other programmes like comedies or
ceremonies
POP M:
Pop music
ROCK M:
Rock music
M.O.R. M:
Middle-of-the-road music (usually called
"easy listening")
LIGHT M:
Light music
CLASSICS:
Classics
OTHER M:
Other music
ALARM:
Emergency broadcasts
NONE:
no Programme type (receive only)
TP:
Broadcasts which carry traffic
announcements
TA:
Traffic announcements are being broadcast
at present.
DISPLAY MODE
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