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Panasonic RS-B25 Service Manual page 9

Dolby b c nr-equipped stereo cassette deck

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Terminal
on
Symbol
Name
Function/operation
5.
Osc
Clock Oscillation
* Clock oscillation of about 120kHz.
Note: Do not connect
anything
to this terminal during
other
measurement
because. it will be otherwise affected by the
probe.
3V
Approx. 9usec.
6.
PEo
Audio Muting
PE1
Motor Output
* Shifted
from STOP
to PLAY,
"L" Approx. 0.7sec.
after PLAY
command.
¢ Shifted from
PAUSE
to PLAY,
"L" Approx. 0.5sec. after PLAY
command.
¢ Shifted from STOP to REC PAUSE, "'L" Approx. 0.5sec. after REC
command.
° Shifted
from
MS
to PLAY,
"L"
Approx.
0.8sec..
after
PLAY
command.
Play Command
Stop/ff/Rew/Piay Pause Command
+5V
H
H
Approx. 0.7sec.
¢"H" in STOP mode, '"'L'" in other modes.
8.
PE2
FF/REW Plunger
«"L" for a short time during FF/REW/MS changeover.
Output
(1) STOP > FF > STOP
FF Command
Stop Command
+5V
H
Approx.
Approx.
|
| 0.3sec.
Approx.
0.05sec.
0.18sec.
OV
Stop Mode
FF Mode
(2) STOP > REW > STOP
Rew Command
Stop Command
+5V
Approx.
0.05sec.
OV
Stop Mode
Rew Mode
L
(3) PLAY > MS (FF) > PLAY/STOP
FF Command
Play/Stop Command
Approx.
0.05sec.
Play Mode
L
MS Mode
L.
(4) PLAY > MS (REW) > PLAY/STOP
Rew Command
Play/Stop Command
Approx.
0.05sec.
Play Mode
L
MS Mode
L
No
Symbol
Name
Function/operation
9:
PE3
PLAY Plunger
¢"L" for a short time during PLAY/REC PLAY/MS changeover.
Output
(1) STOP > PLAY ~ STOP/PAUSE
Play Command
Stop/Pause Command
+5V
Approx.
0.05sec.
OV
Stop Mode
Play Mode
L
Stop Mode
(2) PAUSE/REC PAUSE ~ PLAY/REC PLAY
Play Command
Pause Mode
L
Play/Rec Play Mode
(3) MS (FF/REW) > PLAY
Play Command
MS Mode
Play Mode
(4) MS (FF/REW) > STOP
Stop Command
+5V
Approx.
0.05sec.
ov
MS Mode
Le
Stop Mode
10.
TEST
TEST
¢ Connection to GND.
11.
Vss
* Connection to GND.
12.
INT
Reel Table Pulse
¢ Rotation of reel table (with ring, magnet) is detected by Hall IC
Input
(DN6838-S) to judge the tape end.
¢ Rectangular wave input in PLAY, FF, REW, MS.
13.
"RST
Reset Terminal
¢ Used to reset the microcomputer when power is thrown in.
¢ Reset at "'L'' level (0.3 volt or less).
14.
Vpp
Power Supply
¢ Operative on 5.2 volts.
Terminal
15.
PA¢
Key Input
* Input of REW, Timer REC, MS, FF/REW switch.
REW
(S706) |] * The above-mentioned
inputs are read in accordance
with PCé,
TIMER
($1)
PC1, PC2, PC3 scanning.
16.
PA1
ey Input
¢ Input of FF, Timer PLAY, switch.
FF
(S707) || © The above-mentioned
inputs are read in accordance with PC},
TIMER
($1)
PC1, PC2 scanning.
PLAY
(S901)
—ti—
Terminal
No.
22.

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