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JVC HMHDS4EK/EX
Service Manual


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  • Contains Circuit Diagrams
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  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of JVC HMHDS4EK/EX Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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This service manual of the old video cassette recorder VT-LC50EM is very good readable even the tiniest numbers (i.e. IC-pins). The circuits are very clear. Many details of the schematic are very good described but in GERMAN language. Many schematic details - but complete at all. Common background information of several details are enclosed and physical knowledge of the TFT liquid crystal display for example. The manual lacks PCB drawings. If you understand german I would recommend this manual for you.

Text excerpt from page 19 (click to view)
3.1.6 Manual tracking mode (Auto tracking ON/OFF) setting (1) In order to set to the manual tracking mode during tape playback, press the “SP/EP(LP)” button on the remote control unit. • Each press of the button switches the auto tracking ON or OFF. • When the auto tracking is OFF, the monitor screen displays “AT: OFF”. • When the manual tracking mode is set, the tracking is placed at the center position. (2) Press “channel +/-” to adjust the tracking manually.

3.2 Mechanism compatibility adjustment Notes: • Although compatibility adjustment is very important, it is not necessary to perform this as part of the normal servicing work. It will be required when you have replaced the A/C head, drum assembly or any part of the tape transport system. • To prevent damaging the alignment tape in the compatibility adjustment, prepare a cassette tape (for self-recording/playback), perform a test on it by transporting it and making sure that the tape is not bent by the tape transport mechanisms such as in the guide rollers.(See Fig.3-2-2a.) 3.2.1 Tension pole position Notes: • This adjustment must be performed every time the tension band is replaced.
Signal Mode Adjustment part Specified value (A) (B1) (B2) (F) (G)

3.1.7 EVR adjustment Some of the adjustments require the adjustment performed by the EVR system. The main unit have EEPROMs for storing the EVR adjustment data and user setups. Notes: • In the EVR adjustment mode, the value is varied with the channel buttons (+, –). The adjusted data is stored when the setting mode changes (from PB to STOP, when the tape speed is changed, etc.). Take care to identify the current mode of each adjustment item when making an adjustment. • When changing the address setting in the EVR adjustment mode, use the Jig RCU or the remote controller having numeric keypad with which a numeric code can be directly input. The remote control code of the Jig RCU corresponds

• Back tension cassette gauge
[PUJ48076-2]

• PB • Eject end • Adjust pin [Mechansim assembly] • 25 - 51 gf•cm (2.45 – 5 × 10-3 Nm)

to each of the digit keys on the remote controller as follows.
Digit-key 0 1 Code 20 21 23 22 23 4 24 5 25 6 26 789 27 28 29

• As the counter indication and remaining tape indication are not displayed FDP during the EVR adjustment mode, check them on the TV monitor screen. • When performing the EVR adjustment, confirm that the FDP indication is changed to the EVR mode, as shown below.
FDP

(1) Play back the back tension cassette gauge (A). (2) Check that the indicated value on the left side gauge is within the specified value (G). (3) If the indicated value is not within the specified value (G), perform the adjustment in a following procedure.(See Fig.3-2-1a.) 1) Remove the top frame, cassette holder and side frames (L/R) all together. (See “section 2 mecha-nism”.) 2) Rotate the loading motor gear to move the control plate so that the triangular stamping to the left of the “P” stamping is aligned with the stamping (a) on the main deck. This positioning is mode (B1). 3) Adjust by turning the adjustment pin so that the tip of the tension arm is aligned with the stamping (b) on the main deck. 4) Rotate the reel disk (S) by about one turn clockwise and make sure that the round hole of the adjustment pin is located in the “OK” range. If it is outside this range, restart the adjustment from the beginning. After completion of the adjustment, rotate the loading gear motor to return it to the mode (B2) position.
TENSION ARM

CONTROL PLATE Stamping(a) Stamping(b)

Fig. 3-1-7a

EVR mode

OK

NG ADJUST PIN

Fig. 3-2-1a

3-2

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