How it Works
Kenwood
Loading...
DPC-981
User Manual [it]
6 pgs6.9 Mb0
Service manual
16 pgs1.52 Mb0
User Manual [de]
1 pgs55.49 Kb0
User Manual
10 pgs1.93 Mb0
User Manual
6 pgs408.86 Kb0
Table of contents
Loading...

Kenwood DPC-781, DPC-782, DPC-981 Service manual

PORTABLE CD PLAYER
NotesNotes

DPC-781/782/981

SERVICE MANUAL
© 1997-10/B51-5379-00 (K/K) 3176
Cover Assy * (F07-)
Knob (K29-6787-04)
Knob (K29-6785-03)
Variable resistor (R31-0090-05)
Front glass (B10-2388-04)
Plastic cabinet * (A02-)
Chassis (A10-3391-01)
Knob (K29-6783-03)
Knob (K29-6789-04)
* Refer to parts list on page 15.
Knob (K29-6788-03)
Escutcheon * (B07-)
DC jack (E03-0355-05)
Ecctric circuit module (W02-2527-05)
Miniature phone jack * (E11-)
Miniature phone jack (E11-0371-05)
Miniature phone jack (E11-0278-05)

SPECIFICATIONS

Format
System..............................................................................................................................................................Compact disc digital audio system
Laser......................................................................................................................................................................................Semiconductor laser
Audio
Headphone output (16 Ω, 1 kHz).................................................................................................................................................10 mW + 10 mW
[For CHINA and Duty Free Shop in JAPAN]
Digital output optical..............................................................................................................................-21 dBm ~ -15 dBm (wave lenght 660nm)
[For other countries]
Power supply
External DC supply ............................................................................................................................................................................DC 4.5 ~ 6 V
Rechargeable batteries............................................................................................................................................................................DC 2.4 V
Commercially - available alkaline batteries.................................................................................................................................................DC 3 V
Battery life (continuous playback) Repeat playback stops after 16 times. (Figures inside parentheses are the values when D.A.S.C. is ON.)
Commercially-available alkaline batteries (LR6 / AA) x 4 ....................................................................................................Approx. 40 (34) hours
Commercially-available alkaline batteries (LR6 / AA) x 2 .................................................................................................Approx. 18.5 (17) hours
Rechargeable batteries (NB - 130) x 2...............................................................................................................................Approx. 9.0 (8.0) hours
With 2 commercially-available alkaline batteries and rechargeable batteries...................................................................Approx. 27.5 (25) hours
Dimensions (W x H x D)........................................................................................................................................133.6 mm x 26.5 mm x 151.8 mm
Weight (net).........................................................................................................................................................................................270 g (9.5 oz.)
1. KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice.
2. Sufficient performance may not be exhibited at extremely cold locations (where water freezes.).
In compliance with Federal Regulations, following are reproduc­tions of labels on, or inside the product relating to laser product safety.
KENWOOD-Crop. certifies this equipment conforms to DHHS Regulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.
DANGER : Laser radiation when open and interlock defeated. AVOID DIRECT EXPOSURE TO BEAM
DPC-781/782/981
AAA

CONTENTS/ACCESSORIES

CONTENTS

SPECIFICATIONS.........................................Top cover
CONTENTS/ACCESSORIES ......................................2
ADJUSTMENT.............................................................3
PC BOARD ................................................................. 5

Accessories

SCHEMATIC DIAGRAM............................................. 7
EXPLODED VIEW .....................................................13
PARTS LIST...............................................................15
Stereo headphone (1) (W01-0924-05) DPC-782
Rechargeable battery (2) option : NB -130 (W09-1237-05)
Remote controller assy (1) (A70-1037-05) DPC-782
DPC-981 K,P type
Stereo headphone (1) (W01-0946-05) DPC-981 M type (W01-0947-05) DPC-981 K,P type (W01-0954-05) DPC-981 T,E type
AC plug adaptor (1) (E03-0115-05) M type
Audio cord (E30-2782-05) DPC981 T,E type
Remote control (1) (A70-1171-05) DPC-981 M type
DPC-781 M type
(A70-1190-05) DPC-782 X type
Battery (1) DPC-981
(–)
Stereo headphone (1) (W01-0923-05) DPC-981 M type
DPC-781 M type DPC-782 X type
Car battery adaptor (1) (W01-0921-05) DPC-782
Cassette adaptor (1) (W01-0922-05) DPC-782
AC adaptor (1) (W08-0658-05) E type (W08-0659-05) T type (W08-0660-05) X type (W08-0667-05) M type (W09-1251-05) K, P type
2

1. Test Mode

1-1 Setting the test mode

This model can be set to the test mode by shorting the test-land of the X32 board.
Turn on lid
DPC-781/782/981

ADJUSTMENT

START
switch
Is test land
TEST MODEYES
shorted?
NO
Track No. "01"
is displayed.
NO
Normal operation
Is key pushed?
Test mode pro-
cessing
See following table.

1-2 Key and functions avild in test mode

No. Mode Key Name Function TRACK No. display
05
03
01
—
1 05
2 03
3 01
4
While pressing the P. MODE/SEARCH Key, turn the AC ON
PLAY/PAUSE
6)
(
UP
(¢)
STOP
(7)
1. Focus servo.....................................................................................................ON
2. Tracking servo.................................................................................................ON
3. Feed servo......................................................................................................ON
Absolute time at position of limit SW is displayed in time area, then play is started.
1. Focus servo.....................................................................................................ON
2. Tracking servo...............................................................................................OFF
3. Feed servo ....................................................................................................OFF
1. Focus servo...................................................................................................OFF
2. Tracking servo...............................................................................................OFF
3. Feed servo ....................................................................................................OFF
✜ Test mode can be can celled while pressing the STOP (7) Key in 01 mode.
All LCD is turned ON for 2 seconds.
All LCD is turned OFF for 2 seconds.
Returned to normal mode.
ó
ó
After 1, 2 and 3 are fin­ished, track No. played currently and its play time are indicated.
3
DPC-781/782/981
L.P.F
L.P.F
F1 F2
AC voltmeter
VC
1.0kHz
0.05Vrms
L.P.F
L.P.F
T1 T2
AC voltmeter
VC
1.0kHz
0.05Vrms

ADJUSTMENT

No.
1
2
3
4
5
ITEM
LASER
POWER
FOCUS ERROR
TRACKING
ERROR
FOCUS
GAIN
TRACKING
GAIN
INPUT
SETTING
–
Test disc
KTD-03
Test disc
KTD-03
Test disc
KTD-03 Apply
signal of
1.0kHz,
0.05Vrms between
Check-land F1
and F2.
Test disc
KTD-03 Apply
signal of
1.0kHz,
0.05Vrms between
Check-land T1
and T2.
OUTPUT
SETTING
Apply the sensor section of optical power meter on the pickup lens.
Connect an oscillo-
scope as follows.
CH1:RF
(Check-land RF)
CH2:T1
(Check-land TE1)
Connect an oscillo-
scope as follows.
CH1:RF
(Check-land RF)
CH2:T1
(Check-land TE1)
Connect a LPF
between Check­land F1 and F2 to which connect an
oscilloscope or AC
voltmeters.
Connect a LPF
between Check­land T1 and T2 to which connect an
oscilloscope or AC
voltmeters.
PLAYER
SETTING
Short the test land. Confirm
that the display is
Press FF Key and confirm
Confirm that the display is
Confirm that the display is
Confirm that the display is
Confirm that the display is
" ".
that the display is 03.
Press the PLAY key .
"05".
Press the FF key.
" ".
Press the PLAY key .
"05".
Press the PLAY key .
"05".
ALIGNMENT
POINT
–
FE
BALANCE
VR3
TE
BALANCE
VR5
FOCUS
GAIN
VR4
TRACKING
GAIN
VR6
ALIGN FOR
On the power from
0.08 to 0.15 mW, when the diffraction grating is correctly aligned with the RF level of 1.0 Vp-p or more.
Optimum eye pattern
Symmetry between
upper and lower
Two VTVMs should
read the same
value.
Two VTVMs should
read the same
value.
FIG.
–
–
–
(d)
(e)
Note: Test DISC KTD-03, TCD-783 or equivalent LPF : Around 47kΩ + 390 pF or so. Step 1~5 are in Test Mode.
(d) Focus Gain
Two VTVMs should read the same value.
(e) Tracking Gain
Two VTVMs should read the same value.
4
A
C
PC BOARD(Component side view)
1
2
EBD
3
4
5
6
7
Refer to the schematic diagram for the value of resistors and capacitors.
5
Loading...
+ 11 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use