Panasonic RS-B25 - Page 16

S525
) 10 11 12 13 14 15 16 17 18 19
a
NOTES:
°S1 : Timer switch (shown in OFF position).
¢ $601 : Power ON/OFF switch (shown in ON position).
seas ncgpsssipicccessscesccs De a a Se eat i sy e S602 : AC voltage selector (for [XA] mark areas).
{L ch)
oe LINE OUT ¢ $701, $702 : Tape select switch (S701 =: Metal, S702 =: Normal,
1«
38 nei sey a AN decal $701, $702 M: CrO,).
ve Tey ¢ $703, S704 : Dolby NR switch (S703 =: B, S704 =: C,
| $703, S704 H: OUT)
be Sse gp esse ¢ $705 : Auto rec mute switch (shown in OFF position).
ceed cca of) | HEADPHONES ¢ $706 : Rewind switch (shown in OFF position).
¢ $707 : Fast forward switch (shown in OFF position).
¢ $708 : Pause switch (shown in OFF position).
¢ $709 : Play switch (shown in OFF position).
Ges wen td eis ° S710 : Rec switch (shown in OFF position).
2SB621A-R 28B10300 DN6838-S ¢$711 : Stop switch (shown in OFF position).
¢ $901 : PLAY mode switch (shown in OFF position).
icso2 ¢ $902 : FF/REW switch (shown in OFF position).
¢ $904 : Rec inhibit switch (shown in OFF position).
¢ Resistance are in ohms (Q), 1/4 watt unless specified otherwise.
: a2) i x i 1K = 1,000(2), 1M = 1,000k(Q)
Q15,16 ba a ba EK cert * Capacity are in micro-farads (uF) unless specified otherwise.
RETAIN anya selina ¢ All voltage values shown in circuitry are under no signal condition and
play += off == rec "om playback mode with volume control at minimum position otherwise
188133 specified.
| ( ) Saweeee eee be Voltage values at record mode.
R96 10K /
ot tae ee E i7,ie Frgreg }
$$.
F
=
2SC3311Q
:
q METAL /ON 080!
_saaaaaaaeeaaeaooaatinaoaconccoanononnannnanttet
,
10d:
Metal
............Voltage
values
at
Metal
tape
mode.
| COs. eovactevciciens Voltage values at CrO, tape mode.
LM6417E1825
MECHANISM DRIVE For measurement use EVM.
7 ie o( ) indicates B (bias).
:
¢(«sts-«
)
indicates
the
flow
of
the
playback
signal.
k. 2SDI450R
LINE MUTE/ON
RI08
: oO
0
KR
: 2
a4
MECHANISM CIRCUIT SECTION
D801
ISS254
PE 9
e 020 (5
s!
TIMER
R92 10K mater
aowoao
.
=
S7OI-1 s702-1
(Tape Select)
e(s ) indicates the flow of the recording signal.
e Important safety notice
Components identified by A\ mark have special characteristics
important for safety. When replacing any of these components, use
i only manufacturer’s specified parts.
+4 ¢ The part no. of diodes mentioned in the schematic diagram stand for
| production part No. Regarding the part No. with € mark the production
part No. are different from the replacement part No.
Therefore, when placing an order for replacement part, please use the
part No. in the replacement part list.
¢ The supply parts number is described alone in the replacement parts list.
off son off eon
oO O oO O
rg é 14 4
MO AOOOOCODO
4amK
>I
lO ODA OOOODS
aos’
R403 R904
Pe ee Ep
IO OOOO OOOO
s70l-2 $702 -2
(Tape Select)
off seon off son
c903
D9SIO
ee ee
OO OOOO DO
$703 S704
rs Dolby -B Dolby -~C
7 off +on off eon
2 x
42
°
x
°
EE
3° xx
R7IL
a2K
R713 8.2K
R7I7
100
fe
R718 Og
560
|
fs) o ©
fo) °
89 le) 2, 12.6 [12.7
ic90t jos) ot (12.0) oP |e
O—2—@)-—) ()—)
PDS PD2
PDI PD@ OSC PE@® PEI PEZ2 PES TEST Vss
¢ This schematic diagram may be modified at any time with the
; o7n
avaee tNle(seae development of new technology.
METER DRIVE LED BLOCK
7]
97
9.4)
OOMDDOOOYOD
agi
{ale Sale oie * Input level control...MAX
| SPECIFICATIONS ~~ * Balance'control...... Center
c705 0.033 | R720 -RT21 ®
H4 D702 330 470 D701
OO OOOOD
R723 270
p7os FF
Playback S/N ratio
* Test tape...QZZCFM Greater than: 45d6
$708
PAUSE
0706 1
$709
PLAY
ok.
Overall distortion
* Test tape
...QZZCRA for Normal Less than 4%
...QZZCRX for CrO,
+ a aoe ...QZZCRZ for Metal
REC INH D906 | 2 | |
+ | Overall S/N ratio Greater than 43dB
mai Meee op pt aaa ly ant SE a a! ni
750i D301 * Test tape...QZZCRA (without NAB filter)
o707
STIO
REC
1
0708
1 OO OOO ID)
Q701,702 D703 ~710
2SC3311Q 1SS254
METER MUTING
*Caution!
aa ay, a IC and LSI are sensitive to static electricity.
28C33110 28D1423R — MA4056M Secondary trouble can be prevented by taking care during repair.
aa creas *Cover the parts boxes made of plastics with aluminum foil.
*Ground the soldering iron.
*Put a conductive mat on the work table.
*Do not touch the legs of IC or LSI with the fingers directly.
Q207
A 2SC3311Q
TAPE SELECTOR
pa Foe Aes