JVC Super VHS Service Manual
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JVC Super VHS Service Manual

JVC Super VHS Service Manual

Compact vhs camcorder
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SERVICE MANUAL
COMPACT VHS CAMCORDER
GR-FXM383EG,SXM28EG,
Regarding service information other than these sections, refer to the GR-FXM38EG, SXM48EG service manual (No. 86655).
Also, be sure to note important safety precautions provided in the service manual.
SPECIFICATIONS
General
Format
: S-VHS/VHS PAL standard
Power source
: DC 11 V
DC 6 V
Power consumption
Viewfinder on
: 4.0 W (GR-SXM78EA/SXM48EA/SXM780A/SXM480A/
SXM280A/SXM180A only)
3.7 W (GR-SX140A only)
LCD monitor* on
: 4.5 W (GR-SXM78EA/SXM48EA/SXM780A/SXM480A/
SXM280A/SXM180A only)
Video light**
: 3.0 W
* Applicable models only.
** GR-SXM78EA/SXM48EA/SXM780A/SXM480A/SXM280A only.
Signal system
: PAL-type
Video recording system
Luminance
: FM recording
Colour
: Converted sub-carrier direct recording Conforms to VHS
standard
Cassette
:
/
Tape speed
SP
: 23.39 mm/sec.
LP
: 11.70 mm/sec.
Recording time (max.)
SP
: 60 minutes
LP
: 120 minutes
(with EC-60 cassette)
Operating
temperature
: 0°C to 40°C
Operating humidity
: 35% to 80%
Storage temperature
: –20°C to 50°C
Weight
: Approx. 910 g (GR-SXM78EA/SXM48EA/SXM780A/SXM480A/
SXM280A only)
Approx. 900 g
(GR-SXM180A only)
Approx. 850 g (GR-SX140A only)
Dimensions
: 200 mm x 112 mm x 118 mm
(W x H x D)
(GR-SXM78EA/SXM48EA/SXM780A/SXM480A/SXM280A/
SXM180A only)
200 mm x 112 mm x 115 mm
(GR-SX140A only)
(with the LCD monitor* closed and with the viewfinder fully
tilted downward)
* Applicable models only.
SXM58EG,SXM780A
(The specifications shown pertain specifically to the model GR-SXM78EA/SXM48EA/
SXM780A/SXM480A/SXM280A/SXM180A/SX140A)
Camcorder
(Using AC Adapter)
(Using battery pack)
cassette
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
625
Pickup
: 1/6" format CCD
Lens
: F1.6, f = 3.9 mm to 62.4 mm,
16:1 power zoom lens with auto iris and macro control, filter
diameter 40.5 mm
Viewfinder
: Electronic viewfinder with 0.5" black/white CRT
White balance adjustment : Auto/Manual adjustment
LCD monitor
: 3" diagonally measured, LCD
(Applicable models only)
panel/TFT active matrix system
(GR-SXM78EA/SXM780A/SXM480A only)
2.5" diagonally measured, LCD panel/TFT active matrix system
(GR-SXM48EA/SXM280A/SXM180A only)
Speaker
: Monaural
(Applicable models only)
Connectors
: 1 V (p-p ) , 75 Ω unbalanced, analogue output (via Video output
Video
connector)
Audio
: 300 mV (rms), 1 kΩ analogue output
(via Audio output connector)
Digital
: ø3.5 mm, 4-pole, mini-head jack
(GR-SXM78EA/SXM780A only)
: Y : 1 V (p-p), 75 Ω, analogue
S-Video
output
C : 0.30 V (p-p), 75 Ω, analogue output
Power requirement
: AC 110 V — 240 V`, 50 Hz/60 Hz
Output
: DC 11 V
Optional Accessories
• Battery Packs BN-V12U, BN-V20U, BN-V400U
• Compact S-VHS (
) Cassettes SE-C45/30
• Compact VHS (
) Cassettes EC-60/45/30
• Remote Control Unit RM-V700U
• Active Carrying Bag CB-V7U
Some accessories are not available in some areas. Please consult your nearest JVC
dealer for details on accessories and their availability.
Specifications shown are for SP mode unless otherwise indicated. E & O.E. Design and
specifications subject to change without notice.
VHS
PAL
AC Adapter
, 1 A
No. 86664
January 2002

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  • Page 1 : 200 mm x 112 mm x 118 mm (W x H x D) (GR-SXM78EA/SXM48EA/SXM780A/SXM480A/SXM280A/ Some accessories are not available in some areas. Please consult your nearest JVC SXM180A only) dealer for details on accessories and their availability. 200 mm x 112 mm x 115 mm...
  • Page 2 TABLE OF CONTENTS DIFFERENT TABLE ....................................1 to 3 5. PARTS LIST (5-1 to 5-6) PACKING AND ACCESSORY ASSEMBLY <M1> ..........................5-1 FINAL ASSEMBLY <M2> ..................................5-3 MONITOR ASSEMBLY <M5> [GR-SXM780A] ............................. 5-6 The following table indicate main different points between models GR-FXM38EG-X and GR-FXM383EG-X. MODEL GR-FXM38EG-X GR-FXM383EG-X...

  • Page 3: Final Assembly

    The following table indicate main different points between models GR-SXM48EG-X, GR-SXM28EG-F, GR-SXM58EG-X, GR-SXM58EG-Y, GR-SXM58EG-Z and GR-SXM780A. MODEL GR-SXM48EG-X GR-SXM28EG-F GR-SXM58EG-X GR-SXM58EG-Y GR-SXM58EG-Z GR-SXM780A ITEM DC LIGHT Used Not Used Used LCD MONITOR 2.5” 3” DIGITAL TERMINAL Not Used Used BATTERY PACK BN-V11U-E BN-V11U-F BN-V20BU...

  • Page 4: Main Board Assembly

    MAIN BOARD ASSEMBLY <01> REF. MODEL GR-SXM48EG-X GR-SXM28EG-F GR-SXM58EG-X GR-SXM58EG-Y GR-SXM58EG-Z GR-SXM780A ITEM MAIN BOARD ASSY YB10356EB1-01 YB10356EH1-01 YB10356EC1-01 YB10356EJ1-01 IC101 IC(MICRO C ROM) UPD703039-038 UPD703039-039 IC105 IC(DIGITAL) — — TC7S66FU IC1801 IR DETECT UNIT — — — — — PIC-26043S IC4002 IC Z4C2973-32-X...

  • Page 5: Specifications

    Operating humidity : 35% to 80% Storage temperature : –20°C to 50°C Some accessories are not available in some areas. Please consult your nearest JVC Weight : Approx. 910 g (GR-SXM58/SXM48 only) dealer for details on accessories and their availability.
  • Page 6 <TOP VIEW> Fig. 2-2-1 TOP VIEW <BOTTOM VIEW> Note: When reinstalling the cassette housing to the set, pay careful attention to the switch not to damage it. Fig. 2-2-2 BOTTOM VIEW...
  • Page 7 (W1a) (S3a) (W3b) (S3b) (P3) (P1) (W3a) (S1) (W3a) (W1a) (W3a) (W1a) (W1b) (S3a) (S3a) (S3a) (S3a) Fig. M1 Fig. M3 (W2) (S4a) (S4b) (W4) (S4b) (W2) (S2) (W2) Fig. M2 Fig. M4...
  • Page 8 (S5a) (S5a) (S7) (S5a) (S5c) (S5b) Fig. M5 Fig. M7 (S6b) (S8) (S8) Catcher (S6d) (W8a) (S6d) (S6d) (S6d) (W8b) (W8b) (S6c) (S6c) (S6a) Fig. M6 Fig. M8...

  • Page 9: Checkup And Adjustment Of Mechanism Phase

    2.3 CHECKUP AND ADJUSTMENT OF MECHANISM PHASE Note: Pay careful attention to the installing order and phase of mechanism parts of the loading system. Align the two holes of the Loading ring assembly to those of the deck. Align the hole of the Loading gear (T) assembly to that of the deck.

  • Page 10: Tape Transport Adjustment

    2.4 TAPE TRANSPORT ADJUSTMENT 8. When the FM waveform breaks in the level varying proc- ess, subtly adjust the height of guide rollers at every In most cases the deck section is in need electrical ad- breaking point so that the waveform varies as flat as pos- justment, it results from replacement of worm mechanical sible.
  • Page 11 11. Through the above steps, confirm that there occur no 2.4.3 A/C head height & azimuth wrinkling and damage in the tape around the pinch roller 1. Connect the jig connector cable to CN25 on the MAIN and TU guide pole whenever the deck is in operation of board.
  • Page 12 2.4.4 Phase of control head (X value) 2.5 REMARKS 1. Connect the jig connector cable to CN25 on the MAIN 2.5.1 Cleaning board. 1. For cleaning of the upper drum (particularly video 2. Playback the SP stairstep signal of the alignment tape heads), use fine-woven cotton cloth or Kimwipe with al- and observe signal at V.TP FM with external trigger from cohol soaks through.

  • Page 13: Jig Connector Cable Connection

    2.6 JIG CONNECTOR CABLE CONNECTION Remove the cover (JIG). Jig connector cable CN25 Extention connector Cover(JIG) JIG CONNECTOR COMMUNICATION CABLE to 10 pin ( RXD ) to 28 pin ( TXD ) WHITE to 8 or 5 or 4 pin ( GND ) BLACK Fig.

  • Page 14: Section 3 Electrical Adjustment

    2 PROM on to new board. Then adjustment are not required. And if parts such as the following need replacement, spe- (LY20701) cial computerized adjustment are required (Refer to sec. 3.1.1- 4). Please contact to JVC Service for detaile informa- Bottom case assy Serial No. label tion.

  • Page 15: Electronic Viewfinder (E. Vf) Adjustment

    3.2 ELECTRONIC VIEWFINDER (E. VF) ADJUSTMENT 1) Put the deflection yoke to the most inner side of CRT neck first. Then fix the stopper temporary. Notes: 2) Adjust the tilt of picture on the E. VF screen by tilting • Unless otherwise specified, all measurement points and the deflection yoke.

  • Page 16: Board Interconnections

    ∗ BOARD INTERCONNECTIONS NOTE ) : The number of patch cords LCD(MONITOR) MODULE OPEN C_VF_PANEL are indicated by interconnected. E. VF 1 2 3 4 5 6 7 OP BLOCK (Page 4-31) (Page 4-28) CN7602 CN7702 MONITOR (Page 4-29) C-VF C-VF BL ∗...

  • Page 17: Cpu Schematic Diagram

    NOTES : For the destination of each signal and further line connections that are cut off from CPU SCHEMATIC DIAGRAM this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. 0 1 MAIN (CPU) TO REG TO A/C HEAD...

  • Page 18: M.mda Schematic Diagram

    NOTES : For the destination of each signal and further line connections that are cut off from M.MDA SCHEMATIC DIAGRAM this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. 0 1 MAIN (M.MDA) IC1602 TO REG...
  • Page 19 NOTES : For the destination of each signal and further line connections that are cut off from VTR ASP SCHEMATIC DIAGRAM this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. JIG_CONN.

  • Page 20: Dsp Schematic Diagram

    DSP SCHEMATIC DIAGRAM NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. TO LCD/CVF, BW/CVF 0 1 MAIN (DSP)

  • Page 21: F/Z/I/Mda Schematic Diagram

    F/Z/I/MDA SCHEMATIC DIAGRAM NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. 0 1 MAIN (F/Z/I/MDA) IRIS_O/C TO CPU...

  • Page 22: Out Schematic Diagram

    V OUT SCHEMATIC DIAGRAM NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. L4701 TO REG 0 1 MAIN (V OUT)
  • Page 23 TG/CDS SCHEMATIC DIAGRAM NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. TO CCD CN5301 0 1 MAIN (TG/CDS)

  • Page 24: Reg Schematic Diagram

    C6622 NTSC UDZS8.2B-X Light 0.47 100k SSM3K02F 10µ/16 ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ QGA1201C2-02X JVC WB VF ONLY MODEL UDZS7.5B-X ∗ ∗ ∗ ∗ ∗ Light ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ JVC WB VF and 2.5LCD...
  • Page 25 ∗ C7064 /6.3 ∗ ∗ C7051 R7114 R7118 R7122 0.01 ∗ C7065 C7066 ∗ y10244001a_rev0 NOTE : The parts with marked ( ) is not used. # : EXCHANGE PARTS LIST JVC MODEL PANA MODEL ∗ CN25 QGB0506L1-30X 4-21 4-22...
  • Page 26 4.11 BW/CVF SCHEMATIC DIAGRAM NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. TO DSP BWBLEVEL OPEN...

  • Page 27: Jack Schematic Diagram

    S OUT 0 1 MAIN (JACK) ∗ NOTE : The parts with marked ( ) is not used. y30154001a_rev0 Exchange Parts List JVC PC JVC NON PC model PANA PC NON S JVC model JVC model PANA JVC model model...

  • Page 28: Speaker Schematic Diagram

    4.13 SPEAKER SCHEMATIC DIAGRAM NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. 0 1 MAIN (SPEAKER) C2404 R2401...

  • Page 29: Ccd Schematic Diagram

    4.14 CCD SCHEMATIC DIAGRAM NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. IC5301 is incorporated in the CCD base assembly.

  • Page 30: Monitor Schematic Diagram

    4.15 MONITOR SCHEMATIC DIAGRAM NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. J7501 NCB21EK-273X C7502...
  • Page 31 4.16 E. VF SCHEMATIC DIAGRAM NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". When ordering parts , be sure to order according to the Part Number indicated in the Parts List. 6 0 E.
  • Page 32 4.17 TOP OPE UNIT, ZOOM UNIT, REAR UNIT AND SENSOR SCHEMATIC DIAGRAMS NOTES : For the destination of each signal and further line connections that are cut off from this diagram , refer to "4.1 BOARD INTERCONNECTIONS". The schematic diagram is only for reference. Avoid replacing individual parts. TOP OPE UNIT Replace the entire unit only.
  • Page 33 4.22 WAVEFORMS — VTR ASP — IC3501-21 IC3501-25 IC3501-19 IC3501-20 REC 0.1 Vp-p REC 0.57 Vp-p 24 mVp-p 0.24 Vp-p 2 mV/10 µsec/DIV 10 mV/10 µsec/DIV 1 mV/5 msec/DIV 20 mV/5 msec/DIV — DSP — IC4001-160 IC4001-161 IC4001-146 IC4001-147 REC/PB 0.28 Vp-p REC 0.52 Vp-p REC/PB 0.28 Vp-p REC 0.15 Vp-p...

  • Page 34: Voltage Charts

    4.23 VOLTAGE CHARTS <M.MDA> <CPU> MODE MODE MODE MODE MODE PLAY PLAY PLAY PLAY PLAY PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. IC101 IC103 IC1601 IC104 IC105 11.1 11.1 10.3 10.3 IC1801 Q101 11.1 11.1 11.1 11.1 10.3 10.3 Q102...
  • Page 35 MODE MODE MODE MODE MODE PLAY PLAY PLAY PLAY PLAY PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. Q3501 1(E) 2(B) IC1602 3(C) 4(E) 5(B) 6(C) Q3502 1(E) Q1601 2(B) 3(C) 11.1 11.1 4(E) 5(B) 6(C) Q3505 <VTR ASP> MODE REC PLAY PIN NO.
  • Page 36 MODE MODE MODE MODE MODE PLAY PLAY PLAY PLAY PLAY PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. IC4202 Q4251 Q4501 <V OUT> MODE PLAY PIN NO. IC4701 IC4702 IC4501 IC4003 Q4701 Q4702 Q4001 IC4002 <TG/CDS> MODE PLAY PIN NO.
  • Page 37 <CCD> <E.VF> <MONITOR> MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE PLAY PLAY PLAY PLAY PLAY PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. 14.9 14.9 11.1...

  • Page 38: Power System Block Diagram

    4.24 POWER SYSTEM BLOCK DIAGRAM REAR UNIT MAIN REG SECTION M. MDA SECTION DRM_PWR Q6401 L6002 UNREG DRM_PWR DRUM POWER L6001 CAP_PWR F6001 CN28 DRM_CTL BATT_+ CAP_PWR BATT_+ IC6001-6,39PIN Q6501 UNREG M_UNREG REG_3.2V ADP_DC UNREG POWER CAPSTAN ADP_DC F6002 ADP_H M_UNREG MOTOR ADP_H...
  • Page 39 4.25 CPU/MDA SYSTEM BLOCK DIAGRAM MAIN (CPU) (M. MDA) IC101(CPU) IC1601 DRUM ROTOR POSI CENTER POSITION IC103 RTC CS (RTC) AL SI START UP TIMMING SWITCHING DRUM CLK CONTROL CONTROL SCLK AL CLK D COIL U OSCIN D COIL U FORWARD DRUM ON C1617...
  • Page 40 4.26 CAMERA AND Y/C SYSTEM BLOCK DIAGRAM 0 2 CCD MAIN V_PB_C IC5201 (TG/CDS) IC4001(DSP) (DSP) (CDS/AGC/AD) IC5301 Q5301 CN5301 CN22 OPTICAL CCD_OUT CDSIN γ BLKSH PROCESS BLOCK CONV CLAMP γ T. G SEPA DSP CONTROL BLKFB (3LINE) OFFSET CDS_CLK INTER FACE SERIAL INTERFACE ADCLK...
  • Page 41 JIG_CONN. CN25 J504 A/V OUT V_PB_C IC4001(DSP) J505 S OUT IC4701 DA_R (V OUT) ∗ DA_B IC4702 Y/C MIX TO LCD/CVF &6dB AMP (V OUT) Q3502 IC3501 DA_G CH2_S (VTR ASP) PB AMP TO BW/CVF CH2_F BWY0 BWYOUT Q3502 Q4701 Q4702 PB AMP CH4_S...

  • Page 42: Monitor System Block Diagram

    4.27 MONITOR SYSTEM BLOCK DIAGRAM LCD MONITOR T7501 T7501 MONITOR FROM REG CN16 CN7601 F7501 F7501 REG_4.8V REG_4.8V REG_4.8V Q7503 Q7503 Q7501 Q7501 Q7504 Q7504 Q7502 Q7502 FROM CPU CN7602 LCD_CTL L7604 LCD_CTL REG_15V L7601 REG_3.2V MREG_4.8V VSS(REG_-15V) REG_3.2V CLK1 CLK1 IC7602 R7607...

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