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POTABLE MD RECORDER
DMC-G7R
SERVICE MANUAL
Decoration plate
(B07-2372-08)
Top cover
(F07-0798-08): S
(F07-0799-08): B
S: SILVER, B: BLUE
System .........................................................MiniDisc digital audio system
Read method ...Noncontact optical reading system (semiconductor laser)
Rotating speed ..........................................................About 400 - 900 rpm
Sampling frequency..............44.1 kHz (32 kHz and 48 kHz are converted
to 44.1 kHz and recorded)
Audio compression...........ATRAC (Adaptive Transform Acoustic Coding)
Number of channels ...................................................Stereo : 2 Channels
Recording method.........................Magnetic modulation overwrite system
Error correction method ...................................................AC / RC method
Frequency response.......................................20 Hz to 20,000 Hz (±3 dB)
Wow & flutter .............Less than unmeasurable limit (±0.001 % W.PEAK)
Input jack........................Line/optical combined input x 1; microphone x 1
(plug-in power type)
Output jack ..............................Headphone/remote control combined jack
Input sensitivity : MIC H .....................................................0.25 mV/10 kΩ
MIC L........................................................2.5 mV/10 kΩ
LINE ........................................................100 mV/20 kΩ
Output level : phones.....10 mW + 10 mW (Maximum output level/at 16Ω)
LINE ..................350 mV (at -12dB, standard output/50 kΩ)
Power source...DC 5 V
: AC adaptor (AC 120 V, 50/60 HZ)
DC 3.6 V : Lithium ion battery x 1
DC 5 V
: Car battery adaptor (sold separately, DC-C50)
DC 4.5 V : Dry batteries case (sold separately, BC-F5)
1. KENWOOD follows a policy of continuous advancements in development, For reason specifications may be changed without notice.
Notes
Notes
2. The full performance may not be exhibited in an extremely cold location (under a water-freezing temperature).
In compliance with Federal Regulations, following are reproduc-
tions of labels on, or inside the product relating to laser product
safety.
Knob (PLAY/PAUSE)
(K27-2229-08)
Cover
(F07-1624-08)

SPECIFICATIONS

Monaural Extended mode : 1 channel
© 1997-7/B51-5335-00 (K/K) 2740
Knob (STOP)
(K27-2231-08)
Knob (REC)
(K27-2227-08)
Front cabinet
(A02-1357-08): S
(A02-1358-08): B
Knob (EJECT)
(K27-2232-08)
Battery life ..................................................................................................
(fully charged batteries)
Type of battery
Rechargeable battery only Approx. 9.5 hours Approx. 7 hours
Alkaline batteries
Rechargeable battery +
Alkaline batteries
(Continuous recording time : based on analog input and recording
monitor volume level of "0"
(Continuous playback time : based on volume level of "VOL 20")
• Time of use may vary depending on battery maker, batter type,
use environment, and temperature.
Dimensions (W) x (H) x (D) ....................109.2 mm x 29.8 mm x 81.3 mm
Weight (Net) .................Approx. 270 g (0.59 lb)
Including the accessory rechargeable battery
Approx. 222g (0.49 lb)
not including the accessory rechargeable battery
KENWOOD-Corp. certifies this equipment conforms to DHHS
Regulations No. 21 CFR 1040. 10, Chapter 1, Subchapter J.
DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM.
Knob (EDIT MODE)
(K27-2230-08)
Continuous
Continuous
playback time
recording time
Approx. 24 hours Approx. 17 hours
Approx. 35 hours Approx. 25 hours
(4-5/16" x 1-3/16" x 3-3/16")

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   Summary of Contents for Kenwood DMC-G7R

  • Page 1: Specifications

    DC 5 V : Car battery adaptor (sold separately, DC-C50) DC 4.5 V : Dry batteries case (sold separately, BC-F5) 1. KENWOOD follows a policy of continuous advancements in development, For reason specifications may be changed without notice. Notes Notes 2.

  • Page 2

    DMC-G7R CONTENTS / ACCESSORIES Contents SPECIFICATIONS ........Front cover PC BOARD ..............19 CONTENTS / ACCESSORIES ........2 SCHEMATIC DIAGRAM ..........23 DISASSEMBLY FOR REPAIR........3 EXPLODED VIEW .............27 TROUBLE SHOOTING ..........5 PARTS LIST...............29 Accessories AC adaptor(1) Remote control (1) Stereo headphone(1) (W08-0668-08) : K...

  • Page 3

    DMC-G7R DISASSEMBLY FOR REPAIR (A1) x2 Caution on Disassembly Ø2x2mm Follow the below-mentioned notes when disassembling Bottom Cover the unit and reassembling it, to keep it safe and ensure (B1) x2 excellent performance: Ø2x2mm 1. Take the battery and minidisc out of the unit.

  • Page 4

    DMC-G7R DISASSEMBLY FOR REPAIR (A2) x 3 Remove the mechanism according to the disassembling meth- Ø1.4 x 4.5mm ods 1 to 4. (See Page 7.) How to remove the disc motor (See Fig. 8-1.) 1. Remove the solder joint (A1) x 1 of flex PWB.

  • Page 5

    It is advisable to use the TEST mode (refer to Error Data Display Mode, P15) indicating the causes of troubles before • Abnormal display starting repair. Causes of operation errors (up to 10 errors) are recorded as error codes. This information is useful for repair.

  • Page 6

    Continued from the preceding page • Test mode check Insert a high reflection (low reflection) disc, and once perform automatic adjustment in AUTO mode, and then check in MANUAL mode. In case of high reflection disc, proceed to the item "normal Check whether values of pins 10, 11, 14, and 15 of IC201 and Simultaneously observe waveforms of EFM(TP145), FEOUT(TP143), and TEOUT(TP144).

  • Page 7

    • Normal playback • Recording/playback operation When the address up to the sector address has been proved to be normal in the test mode. Insert a low reflection disc, and ascertain audio output by normal playback, and then set TEST REC mode. Is initialization performed normally in case of high reflection Check voltage of pins 56 and 57 of IC401, pins 2, 4, 7, and 9 of Does the head move down, failing to start record even...

  • Page 8

    Operation in each TEST mode Test disc 1. AUTO Mode Step No. Operation and state Display MD adjustment needs two types of disc, namely recording disc (low reflection disc) and playback-only disc (high reflection disc). • When the STOP button is pressed while the AUTO menu Step 1 Test mode STOP state T E S T...

  • Page 9

    3. RESULT Mode Step No. Operation and state Step No. Display Operation and state Display Step 1 Test mode STOP state T E S T Step 17 Indication of measurement value: [ L f _ _ Low reflection focus gain Step 2 BASS button Step 18...

  • Page 10

    •When the STOP button is pressed while the TEST-PLAY menu appears, or in TEST-PLAY or continuous playback mode, the mode changes 5. TEST-REC Mode to the TEST mode stop state. • When the PLAY button is pressed while the TEST-PLAY menu appears,continuous playback is initiated from the current pickup position. Step No.

  • Page 11

    7. NORMAL Mode 9. Error data display Mode Error data list Step No. Setting Method Display Step No. Setting Method Display Step No. Setting Method Display Error Code Contents Step 1 Test mode STOP state T E S T Step 5 NORMAL menu [ N O R M A L ] Step 1...

  • Page 12

    Lead-in switch position adjusting method -PROM (IC402) writing procedure 1. Procedure to replace E -PROM and write initial value of microcomputer in E -PROM Note: Measure the position of lead-in switch in the INNER mode, and fix the position of lead-in switch at SUBQ FF85 to FF02. After retightening the screw, pressing the mechanism PWB in the arrow direction, measure again the position of lead-in switch.

  • Page 13: Trouble Shooting

    DMC-G7R TROUBLE SHOOTING Test Mode Change Chart Test Auto Change Chart T E S T A U T O T E S T M O D E A U T O T E S T S T O P M E N U...

  • Page 14

    DMC-G7R TROUBLE SHOOTING Manual Adjustment Change Chart Result Indication Change Chart RESULT DISP R E S U L T MANUAL ADJUST M A N U A L MENU MENU PLAY PLAY T M P : Temperature T M P :...

  • Page 15

    DMC-G7R TROUBLE SHOOTING Error Data Indication Change Chart EEPROM Setting Change Chart DISP EEPROM Error data E E P R O M D A T A C L E A R setting menu indication menu After 2 seconds PLAY PLAY...

  • Page 16

    DMC-G7R TROUBLE SHOOTING EEPROM Focus Setting Change Chart EEPROM Spin Setting Change Chart EEPROM Tracking Setting Change Chart Tracking setting Focus setting T r a c k Spin setting F o c u s menu S p i n menu...

  • Page 17

    WAVEFORM NOTES ON SCHEMATIC DIAGRAM • Resistor: (CH), (TH), (RH), (UJ): Temperature compensation PLAY Condition CH1=2V CH2=2V CH3=2V CH4=2V 1s/div DC 10:1 DC 10:1 DC 10:1 DC 10:1 (1s/div) (ML): Mylar type To differentiate the units of resistors, such symbol as K and CH1=500mV 500s/d •...

  • Page 18

    DMC-G7R PARTS DESCRIPTIONS...

  • Page 19

    PC BOARD(Component side view) P34 2 - D TO FLEXIBLE PWB (227) P35 12 - D P34 2 - G TO FLEXIBLE TO LCD FLEXIBLE PWB (7) PWB (227) BATTERY( ) 10 9 L881 C881 IC851 TP471 TP804 TP213 TP215 TP214 XL201 TP105...

  • Page 20

    PC BOARD(Component side view) C. MODE LCD UNIT(220) ENTER TO MAIN PWB EDIT/ DISPLAY AUTO MARK/ CNS401 TIME MARK P33 7 - D COLOR R D ( R) W H ( W ) FLEXIBLE PWB UNIT TABLE BROWN ORANGE YELLOW GREEN BLUE VIOLET...

  • Page 21

    HEAD DRIVE PWB-B2 MAGNETIC HEAD (11) PLAYBACK SIGNAL 7 6 5 4 3 2 1 RECORD SIGNAL Q351 2SK2909 C206 0.18 C351 TP211 150P TP212 (CH) TP213 Q354 TP214 2SK2911 TP215 C129 C132 R141 10/6.3 C150 Q351~Q354:HEAD DRIVER R144 R143 2.2K C131 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76...

  • Page 22

    0.4V 2.75V 0.98V 1.35V 2.75V 0.98V 1.33V 1.85V 2.8V 1.91V 1.33V 1.3V 1.35V 1.6V 1.45V DMC-G7R 2.8V The numbers 1 to ( are waveform numbers shown in page 17. NOTE ON SCHEMATIC DIAGRAM can be found on page 17. Y22-7380-10...

  • Page 23

    DMC-G7R EXPLODED VIEW(MD MECHANISM) PWB-B2 15 19 109x2 105 116x2 M903 PWB-B1 M902 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 24

    DMC-G7R EXPLODED VIEW(UNIT) 605x2 605x2 601x2 204x4 603x4 PWB-A 604x3 605x2 605x2 DMC-G7R Parts with the exploded numbers larger than 700 are not supplied.

  • Page 25

    Ref. No Parts No. Description Parts No. Ref. No Description ress Parts nation marks Parts nation marks ress DMC-G7R N09-3295-08 SCREW 1.7X2.5 A70-1129-05 REMOTE CONTROL A02-1355-08 CENTER CABINET (BLUE) A70-1177-05 REMOTE CONTROL A02-1356-08 CENTER CABINET (SILVER) B46-0100-40 WARRANTY CARD E35-1924-08...

  • Page 26

    New Parts New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.

  • Page 27

    New Parts New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.

  • Page 28

    New Parts New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.

  • Page 29

    New Parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. Add- Desti- Parts No. Ref. No Description Parts nation marks ress Q354 2SK2911 Q711 DTC323TK...

  • Page 30

    P.O BOX 55-2791, Piso 6 plaza Chase, Cl. 47 y Aquilino de la Guardia Panama, Republic de Panama KENWOOD ELECTRONICS U.K. LIMITED KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB., United Kingdom KENWOOD ELECTRONICS BENELUX N.V. Meachelsesteenweg 418, B-1930 Zaventem, Belgium KENWOOD ELECTRONICS DEUTSCHLAND GMBH Rembrücker Str.

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