Bedienungsanleitung JVC DR-MV1SUS (Seite 5 von 24) (Englisch)

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(No.YD006)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 Service position

This unit has been designed so that the Mechanism and Main

board assemblies can be removed together from the bottom

chassis. Before diagnosing or servicing the circuit boards, take

out the major parts from the bottom chassis.

2.1.1 How to set the "Service position"

(1) Refer to the disassembly procedure and perform the disas-

sembly of the major parts before removing the Mechanism

assembly.

(2) Remove the screws that fix the Mechanism, Main board as-

sembly to the bottom chassis. If any other screws are used

to fix the boards, remove them also.

(3) Remove the combined Mechanism, DVD unit, regulator,

digital, junction 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. 2-1a.)

(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 as-

sembly.

Notes:

• Before inserting the power cord plug into the power out-

let, 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 "Removing

the major parts".

• 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 "Service position", be sure to

ground both the Main board and Mechanism assem-

blies. 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 inop-

erative status.

• In order to diagnose the playback or recording of the

cassette tape, set the Mechanism assembly to the re-

quired mode before placing it upside down. If the mech-

anism mode is changed (including ejection) while it is in

an upside down position the tape inside may be dam-

aged.

• For some models, the mechanism and board assem-

blies are attached by connectors only. When carrying

out a diagnosis or repair of the boards in the "Service

position", make sure that the connectors are not dis-

connected.

Fig.2-1a

2.2 Jig RCU mode

This unit uses the following two modes for receiving remote con-

trol 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 EE-

PROM, 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 neces-

sary operations have been completed.These modes can be set

by the operations described below.

Note:

• When the unit is set to JIG mode and when the unit is

under JIG mode, the remote control unit attached to

product operates only in "Remote Control Code 1".

Since the unit is in "Remote Control Code 3" when it is

shipped and just after its batteries are changed, "Re-

mote Control Code 3" needs to be changed to "Remote

Control Code 1."

• Confirm the RCU mode when exchanged parts. Since

some SERVICE PARTS sets the VCR to the Jig RCU

mode as initial setting. Therefore please set the VCR to

the user RCU mode after replacing the EEPROM.

Fig.2-2a User/Jig RCU mode

TP111 D.FF

TP106 PB FM

TP2253 A.PB FM

TP4001 CTL.P

Main board assy

Regulator board assy

Switch display board assy Operation jack board assy

Jack

board

assy

Digital

board

assy

Junction

board

assy

( blinked)

Jig RCU mode

User RCU mode

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