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JVC HRJ790EU
Service Manual


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

Description of JVC HRJ790EU 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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Text excerpt from page 15 (click to view)
1.4 Service position This unit has been designed so that the Mechanism and Main board assemblies can be removed together from the chassis assembly. Before diagnosing or servicing the circuit boards, take out the major parts from the chassis assembly. 1.4.1 How to set the âService positionâ

1.5

Jig RCU mode

This unit uses the following two modes for receiving remote control codes. 1) User RCU mode : Ordinary mode for use by the user. 2) Jig RCU mode : Mode for use in production and servicing. When using the Jig RCU, it is required to set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received). As both of the above two modes are stored in the EEPROM, it is required to set the VCR back to the User RCU mode each time that an adjustment is made or to check that the necessary operations have been completed. These modes can be set by the operations described below. 1.5.1 Setting the Jig RCU mode (1) Unplug the power cord plug from the power outlet. (2) Press and hold the âRECâ and âPAUSEâ buttons on the VCR simultaneously, while plugging the power cord plug into the power outlet. When the VCR is set to the Jig RCU mode, the symbols ( â : â ) in the time display of the FDP are turned off. 1.5.2 Setting the User RCU mode (1) Turn off the power. (2) Press the âRECâ and âPAUSEâ buttons of the VCR simultaneously. Alternatively, transmit the code â80â from the Jig RCU. 1.6 Mechanism service mode This model has a unique function to enter the mechanism into every operation mode without loading of any cassette tape. This function is called the âMechanism service modeâ. 1.6.1 How to set the âMechanism service modeâ (1) Set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received). (2) Transmit the code âE5â from the Jig RCU. (3) Release the lug of the Cassette holder and then slide the Cassette holder toward the direction where the Cassette holder is loaded by manually. (4) The cassette holder lowers and, when the loading has completed, the mechanism enters the desired mode. When the VCR is set to the Mechanism service mode, the symbols (âTimerâ) in the FDP (LED) are blinked. 1.6.2 How to exit from the "Mechanism service mode" (1) Unplug the power cord plug from the power outlet.

(1) Refer to the disassembly procedure and perform the disassembly of the major parts before removing the Mechanism assembly. (2) Remove the screws that fix the Mechanism assembly to the Chassis assembly. If any other screws are used to fix the boards, remove them also. (3) Remove the combined Mechanism and Main board assemblies. (4) If any other major parts are used, remove them also. (5) Connect the wires and connectors of the major parts that have been removed in steps (1) to (4). (Refer to Fig. 1-2-2d.) (6) Place the combined Mechanism, Main board and other board assemblies upside down. (7) Insert the power cord plug into the power outlet and then proceed with the diagnostics and servicing of the board assembly. Notes: ⢠Before inserting the power cord plug into the power outlet, make sure that none of the electrical parts are able to short-circuit between the workbench and the board assembly. ⢠For the disassembly procedure of the major parts and details of the precautions to be taken, see â1.2 Removing the major partsâ. ⢠If there are wire connections from the Main board and

Mechanism assemblies to the other major parts, be sure to remove them (including wires connected to the major parts) first before performing step (2). ⢠When carrying out diagnosis and repair of the Main board assembly in the âService positionâ, be sure to ground both the Main board and Mechanism assemblies. If they are improperly grounded, there may be noise on the playback picture or FDP counter display may move even when the mechanism is kept in an inoperative status. ⢠In order to diagnose the playback or recording of the cassette tape, set the Mechanism assembly to the required mode before placing it upside down. If the mechanism mode is changed (including ejection) while it is in an upside down position the tape inside may be damaged. ⢠For some models, the mechanism and board assemblies are attached by connectors only. When carrying out a diagnosis or repair of the boards in the âService positionâ, make sure that the connectors are not disconnected.
TP106 PB.FM TP4001 CTL.P TP111 D.FF

TP2253 A.PB.FM

Main board assembly

CP4001

CP3001 CN7001 C3025 Timer clock

TO ADV.JOG [HR-J790EU/J795EK/J795MS]

Fig. 1-4-1a 1-9

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