1-4
Fig. 1-4-1a
TP7001
(TEST)
Jack
board assembly
Display board assembly
TPGND
CP4001
CP5302
CP5301
Main board assembly
2D Digital board assembly
S-Sub board assembly
Demod board
assembly
S/P Converter
board assembly
Audio erase
board
assembly
Terminal board assembly
TP111
D.FF
TP4001
CTL.P
VR1201
D/A LEVEL
ADJ
TP2253
A.FM
TP106
PB.FM
CN902
CN901
CN6102
CN513
CN6102
CN6101
C3025
TIMER CLOCK
CN7192
CN3011
CN7191
CN7001
Rec safety board assembly
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 Drum
assembly.
(2) Lower the cassette holder to prepare for the removal of
the Mechanism assembly screws. (Refer to the “Proce-
dures for lowering the Cassette holder assembly” of 1.3
Disassembly/assembly method.)
(3) Remove the combined Mechanism and Main board as-
semblies.
(4) Remove the Rec safety board, Display board and S/P
converter board assemblies.
(5) Connect the wires and connectors of the major parts that
have been removed in step (1) and (4). (Refer to Fig.1-
4-1a.)
(6) Place the combined Mechanism assembly, Main board
assembly and other board assemblies.
(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 “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.
• 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.
1.5 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 “Mechanism service mode”.
1.5.1 How to set the “Mechanism service mode”
(1) Unplug the power cord plug from the power outlet.
(2) Connect TPGND and TP7001(TEST) on the Main board
assembly with a jump wire.
(3) Insert the power cord plug into the power outlet.
(4) With lock levers (A) (B) on the left and right of the Cas-
sette holder assembly pulled toward the front, slide the
holder in the same direction as the cassette insertion di-
rection. (For the positions of lock levers (A) (B), refer to
the “Procedures for lowering the Cassette holder assem-
bly” of 1.3 Disassembly/assembly method.)
(5) The cassette holder lowers and, when the loading has
completed, the mechanism enters the desired mode.
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.
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3/3/2019
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