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When the Pornær is Switched on (See Fig. 5-91
When the power is switched on, +B is passed via
C4O4 and R415 to Q40G, being turned on for
about 1.5 to 2.5 seconds (until C404 is fully charg-
ed). This results in pin 2 (STOP) of IC402 being
switched to L level, thereby ensuring that the deck
is orginally in stop mode. If any other switch is
pressed during this initial brief period, the deck
will remain in stop mode. +B will, however, be
applied to the capstan motor and the motor will
start up.
Playback Mode
When the PLAY switch (S2/SB) is pressed, pin 1
(PIÂY)
of. tC4O2 is switched to L level and pin 12
(O-PLAY) to H level. +82 is thereby passed via
F"423 and R424 to Q410, rezulting in this transist-
or being tumed on. The pinch solenoid SOL is
consequently activated and playback mode com_
menced (see Power.Assist Mechanism).
Recording Mode
1. Iilhen a cassette half with the erasure preven-
tion tabs intact is loaded into the deck (result-
ing in the erasure prevention switch S10 being
switched to the NO HOLE position) and SZ
switched on, pin 10 (O-REC) and pin 12
(0-PLAY) of.IC4O2 switched to H level.
2. The pin 10 output is applied to the base of
Q426 vira R481. With e426 turned on, pin 2
(REC signal input) of. IC4OI is switched to L
level. And since pin 12 is at H level, pin 1b
(PLAY signal input) of IC401 is switched to
H level resulting in pin 6 (head switch) and pin
16 (recording/playback switch) of IC401 also
being switched to H level. The recording input
shorting relay RY301 in the record/playback
head circuit is opened and the playback output
shorting transistor Q101 is tumed on (thereby
switching the head to recording mode).
3. With'pin 10 of IC4O2 and the playback output
shorting transistor Q301 is turned on and the
bias oscillator activated.
If a cassette half without the erasure preven_
tion tabs is loaded, S10 is switched to the
HOLE position, resulting in pin g (À-R) of
IC4O2 being switched to L level. In this state,
the tape deck will not be switched to recording
mode when pin Z (EE-C) is switched to L level.
Fast Forward Mode
When the FF switch (Sg/S4) is pressed, pin 1b
(0-FF) of. 1C402 is switched to H level, reiulting
in +32 being passed, to e40T via R4LT and R41g.
And once Q407 is tumed on, the FF solenoid
is activated to start fast forward mode.
Rewind Mode
When the REIV switch (S2lSb) is pressed, pin
13 (O-REW\ of.lC4O2 is switched to H level, result-
ing in +82 being passed to Q408 via R420 and
R42L, thereby turning Q408 on to activate the
REW solenoid for start of rewind mode.
Time Playback Mode
Tape playbaek is started automatically at the
time set by the timer.
1.
I{hen the power is switched on with the
TIMER switch S11 on and S12 set to play, +B
is immediately passed to Q411 via C406 and
È426, thereby tuming Q411 on for about B to
5 seconds (until C406 is fully charged). In
addition, +B is applied to Q406 via C404 and
R415, resulting in Q406 being turned on for
about 1.5 to 2 seconds (until C404 is fully
charged). As a rezult, pin 1 (Pf,Ây) and pin 2
(STOP) of.IC OZ are switched to L ievel.
-
2. lflhile pin 2 remains at L level, stop mode has
priority
over all other modes, and pin 12
(O-PLAY) of. 1C402 is switched to L level.
REC/PB head
ry
o!0.+B3
osc
B L O C K
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