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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 cir-
cuit boards, take out the major parts from the chassis as-
sembly.
1.4.1 How to set the "Service position"
(1) Refer to the disassembly procedure and perform the dis-
assembly of the major parts before removing the D-PRE/
REC board assembly.
(2) Remove the screws attaching the mechanism assembly
with the chassis assembly. Remove the screws attach-
ing the board assembly, if necessary.
(3) Remove the combined Mechanism and Main board as-
semblies.
(4) Connect the wires and connectors of the major parts that
have been removed in step (1). (Refer to Fig.1-4-1a.)
(5) Place the combined Mechanism and Main board assem-
blies upside down.
(6) 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 "1.3 Disas-
sembly/assembly method".
• 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 in-
operative status.
Digital board assembly
To D-PRE/REC
CN8002
CN9801
Main
CN8803
TP106 PB-FM
TP2253 A.PB-FM
TP4001 CTL.P
TP7101 Y OUT
CN8801
CN8802
D-PRE/REC
TP111 Video/STD/HS1 FF
TP112 A/HS2 FF
TP601 REC level 1
TP602 REC level 2
TP606 PB data 1
Jack board assembly
TP616 PB data 2
CN7104
To Digital
CN603
CN8803
CN601
TP616 TP112
TP602 TP601 TP606 TP111
CN603
CP6201
To Digital
CN8002
VR6601
Separation
CN9801
CN7107
CN901
TP7101
CN3009
TP7002
(MECHA2)
CN7191
TP7001
(MECHA1)
Fig. 1-4-1a
• 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
mechanism mode is changed (including ejection) while
it is in an upside down position the tape inside may
be damaged.
1.4.2 Precautions for cassette loading in the "Service
position"
The REC safety board assembly detects cassette loading as
well as cassette tabs. Therefore, after the assembly has been
removed in the "Service position", it is required to set the
switch manually on the REC safety board assembly when a
cassette is loaded.
1.4.3 Cassette loading and ejection methods in the
"Service position"
(1) Insert a cassette halfway in the Cassette holder assem-
bly.
(2) Set the switch on the REC safety board assembly to on
(by pressing the switch).
(3) As soon as the cassette starts to be loaded, set the
switch on the REC safety board assembly to off (by re-
leasing the switch).
(4) Now the desired operation (recording, playback, fast for-
ward, rewind, etc.) is possible in this status.
(5) The switch on the REC safety board assembly does not
have to be operated when ejecting a tape. But be sure
to turn the set to the normal position before ejecting the
tape.
Note:
• In the "Service position", the cassette tabs cannot be de-
tected and recording becomes possible even with a cas-
sette with broken tabs such as the alignment tape. Be very
careful not to erase important tapes.
S-Sub board assembly
Terminal board assembly
3D Digital/4M
board assembly
TP106
TP4001
TP2253
Main board
assembly
CN601
VR1401
D-PRE/REC
D/A level
CP4001
board
assembly
To Digital
CN8801
CP3002
CN8802
CN5601
CN3008
REC Safety board assembly
CN7005
Display board assembly
CN7002
CN5504
CN5502
CN5503
Sub Reg board assembly
CN5302
CN5303
SW. Reg board assembly
1-5
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