SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 Service position
This unit has been designed so that the Mechanism and Main
Main board assy
board assemblies can be removed together from the bottom
Regulator board assy
TP111 D.FF
chassis. Before diagnosing or servicing the circuit boards, take
TP106 PB FM
out the major parts from the bottom chassis.
JunctionTP2253 A.PB FM
TP4001 CTL.P
2.1.1 How to set the "Service position"board
assy
(1) Refer to the disassembly procedure and perform the disas-
sembly of the major parts before removing the MechanismDigital
board
assembly.
assy
(2) Remove the screws that fix the Mechanism, Main board as-
Jack
sembly to the bottom chassis. If any other screws are used
board
to fix the boards, remove them also.assy
(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 thenSwitch display board assyOperation jack board assy
proceed with the diagnostics and servicing of the board as-
Fig.2-1a
sembly.
2.2 Jig RCU mode
Notes:
This unit uses the following two modes for receiving remote con-
? Before inserting the power cord plug into the power out-
trol codes.
let, make sure that none of the electrical parts are able
(1) User RCU mode:Ordinary mode for use by the user.
to short-circuit between the workbench and the board
(2) Jig RCU mode: Mode for use in production and servicing.
assembly.
When using the Jig RCU, it is required to set the VCR to the Jig
? For the disassembly procedure of the major parts and
RCU mode (the mode in which codes from the Jig RCU can be
details of the precautions to be taken, see "Removing
received). As both of the above two modes are stored in the EE-
the major parts".
PROM, it is required to set the VCR back to the User RCU mode
? If there are wire connections from the Main board and
each time that an adjustment is made or to check that the neces-
Mechanism assemblies to the other major parts, be sure
sary operations have been completed.These modes can be set
to remove them (including wires connected to the major
by the operations described below.
parts) first before performing step (2).
? When carrying out diagnosis and repair of the MainNote:
board assembly in the "Service position", be sure to? When the unit is set to JIG mode and when the unit is
ground both the Main board and Mechanism assem-under JIG mode, the remote control unit attached to
blies. If they are improperly grounded, there may beproduct operates only in "Remote Control Code 1".
noise on the playback picture or FDP counter displaySince the unit is in "Remote Control Code 3" when it is
may move even when the mechanism is kept in an inop-shipped and just after its batteries are changed, "Re-
erative status.mote Control Code 3" needs to be changed to "Remote
? In order to diagnose the playback or recording of theControl Code 1."
cassette tape, set the Mechanism assembly to the re-? Confirm the RCU mode when exchanged parts. Since
quired mode before placing it upside down. If the mech-some SERVICE PARTS sets the VCR to the Jig RCU
anism mode is changed (including ejection) while it is inmode as initial setting. Therefore please set the VCR to
an upside down position the tape inside may be dam-the user RCU mode after replacing the EEPROM.
aged.
? For some models, the mechanism and board assem-User RCU mode
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.Jig RCU mode
( blinked)
Fig.2-2a User/Jig RCU mode
(No.YD006)1-5 |
ACEC
