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SECTION
1
SERVICING NOTE
Hall element H701 mounted on the main board is used to
detect rotation of the reels. Because it is mounted on the
main board, when the main board is being removed,
FRONT CABINET -
rotation of the reels cannot be detected and the auto-off/
tape-end detector circuit does not operate correctly.
Switch S701 (for N/R and FF/REW) is also mounted on the
main board.
Therefore, without the main board, the head
cannot be placed in playback position, and power cannot be
supplied to the circuitry of the playback system.
When
the main
board
is being removed,
follow
the
procedures
below,
in order to check
operation
of the
mechanisms
of the tape deck
and
to check
voltages
supplied to each circuit.
NOTE:
Do not change the setting position of switch S701
when removing the main board. If it has been changed
accidentally, or if the desired mode cannot be set with
the switch, adjust the setting again after the main
board is installed.
FF/REW mode
(1) Apply a square wave signal or a sine wave signal to
hall element H701. (See the figure on the lower.)
(2) Press the STOP switch for selecting STOP mode.
(3) Press the FF or REW switch.
(4) Remove the main board.
PLAY mode
(1) Apply a square wave signal or a sine wave signal to
hall element H701. (See the figure on the lower.)
(2) Press the STOP switch for selecting STOP mode.
(3) Press the PLAY switch. With the main board installed,
pressing the PLAY switch selects the FWD
or REV
mode alternatively.
(4) Remove the main board.
AF
SQUARE WAVE (SINE WAVE)
OSCILLATOR
5Hz
— 20dB (0.1V)
MAIN BOARD |(SIDE A)
MAIN BOARD (SIDE B)
TP
HALL(+)
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