Akai PJ-33FS User manual

FOUR
BAND
STEREO
CASSETTE
RECEIVER
wovez
PJ-33FS
SECTION 1 SERVICE MANUAL
SECTION
2
PARTS
LIST
.................0.0.00005
25

SAFETY INSTRUCTIONS
SAFETY CHECK AFTER SERVICING
Confirm
the
specified
insulation
resistance
between
power
cord
plug
prongs
and
externally
exposed
parts
of
the
set
is
eater
than
10
Mohms,
but
for
equipment
with
external
antenna
terminals
(tuner,
receiver,
etc.)
and
is
intended
for
C]
or
[A],
specified
insulation
resistance
should
be
more
than
2.2
Mohms
(ground
terminals,
microphone
jacks,
headphone
jacks.
line-in-out
jacks
etc.)
PRECAUTIONS DURING SERVICING
1. Parts identified by the A\ symbol parts are critical for safety.
Replace only with parts number specified.
2. In addition to safety, other parts and assemblies are specified for conformance with such regulations as those
applying to spurious radiation. These must also be replaced only with specified replacements.
Examples: RF converters, tuner units, antenna selector switches, RF cables, noise blocking capacitors, noise
blocking filters, etc.
3, Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
4. Use specified insulating materials for hazardous live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers (Insulating Barriers)
4) Insulation sheets for transistors
5) Plastic screws for fixing microswitch (especially in turntable)
5. When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc.), wrap
ends of wires securely about the terminals before soldering.
c> c>
Observe that wires do not contact heat producing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.).
Check that replaced wires do not contact sharp edged or pointed parts.
Also check areas surrounding repaired locations.
Use care that foreign objects (screws, solder droplets, etc.) do not remain inside the set.
$0.90 Sin
VOLTAGE CONVERSION
If the voltage of your machine is switchable to either 110 to 120V or 220 to 240V, please proceed as follows.
1. Disconnect the power cord.
2. Turn the voltage selector located on the rear of your machine with a screwdriver until the correct voltage is
indicated.
CYCLE CONVERSION
Cycle Conversion is not necessary Since PJ-33FS Uses
DC motor.
VOLTAGE,
SELECTOH

SECTION 1
SERVICE MANUAL
TABLE CONTENTS
SPECIFICATIONS
..
2...
2.2...
ee
cere
eee
ee
ene
eee
4
DISMANTLING
OF
UNIT
..
CONTROLS
.
PRINCIPAL
PARTS
LOCATION
.
REPLACEMENT
OF
THE
DIAL
CORD
.
TUNER
ADJUSTMENT
.............
6-1 MW
SECTION
ADJUSTMENT
.
6-2.
SW
SECTION.
ADJUSTMENT
.
.
6-3.
FM
SECTION
ADJUSTMENT.
.
MECHANICAL
ADJUSTMENTS
.
:
7-1 TAPE
SPEED
ADJUSTMENT
.
Rte
:
7-2.
REC/PB
HEAD
AZIMUTH
ALIGNMENT
wd
VIIT
AMPLIFIER
ADJUSTMENT
............-
8-1
AMPLIFIER
ADJUSTMENT
POINT
.........
15
CLASSIFICATION
OF
VARIOUS
P.C
BOARDS
......
16
9-1 P.C
BOARD
TITLES
AND
IDENTIFICATION
NUMBERS
ashe
:
9-2
COMPOSITION
OF
VARIOUS
P.C
BOARDS..............---
17,
a<235R6
=
FE]
For basic adjustments, measuring methods, and operating principles, refer to GENERAL TECHNICAL
MANUAL.
SERVICE MANUAL P3J-33FS:

I.
SPECIFICATIONS
Ss
TYPE
Four
Band
Stereo
Cassette
Receiver
FREQUENCY
RANGE
FM:
87.6
to
108
MHz
MW:
525
to
1605
kHz
SW,:
3.0
to
8.0
MHz
SW.: 8.0 to 22.0 MHz
SPEAKER
SYSTEM
Three
dimentional
speaker
system
2 way and passive radiator at rear
Tweeter:
Flat
diaphragm
(39
mm
x
2)
Woofer: Corn type (87 mm x 2)
Passive
radiator:
(87
mm
x
2)
POWER
OUTPUT
Peak
music
power
output:
30W
x
2
Maximum
power
output:
15W
x
2
EIAJ/DC
10%
Distortion:
10W
x
2
WOW
AND
FLUTTER
0.08%
WRMS
FREQUENCY
RESPONSE
Normal:
50
to
13,000
Hz
CrO,:
50
to
14,000
Hz
Metal:
50
to
16,000
Hz
S/N
RATIO
Better
than
52
dB
}
Dolby
NR
switch
on:
Improves
up
to
10
dB
above
5
kHz
POWER
REQUIREMENTS
AC:
120V,
60
Hz
for
Canada
and
USA
220V,
50
Hz
for
Europe
except
UK
240V,
50
Hz
for
UK
and
Australia
110
to
120V/220
to
240V,
50/60
Hz
for
other
countries
DC:
13.5V
SUM-I
“D”
size
or
Equivalent
x
9
DIMENSIONS
Total:
—
538(W)
x
153(H)
x
147(D)
mm
Stereo
cassette
receiver:
328(W)
x
153(H)
x
147(D)
mm
Speakers:
105(W)
x
153(H)
x
1277)
mm
WEIGHT
Total:
6.0
kg
(without
batteries)
Stereo
cassette
receiver:
3.6
kg
(without
batteries)
Speakers:
1.2
kg/unit
x
2
*
For
improvement
purposes,
specifications
and
design
are
subject
to
change
without
notice.
*
“Dolby”
and
Double
D
symbol
are
trademarks
of
Dolby
Laboratories
Licensing
Corporation.
(Manufactured
under
license
from
Dolby
Laboratories
Licensing
Corporation.)
TTT
Tn
SERVICE
MANUAL
PJ-33
FS
4

ll. DISMANTLING OF UNIT
In
case
of
trouble,
etc.
necessitating
dismantling,
please
dismantle
in
the
order
shown
in
the
photographs.
Reassemble
in
reverse
order.
“BACK LID
SPEAKER
LEFT
Set the carring handle
‘at this position
SPEAKER
RIGHT
PANEL
db SCREWS & KNOBS
a {CABINET
SCREW
SCREWS
SCREWS
SERVICE MANUAL. PJ-33FS

SCREWS:
ba
SCREWS
SCREWS:
SERVICE MANUAL PJ:33FS:

O©MNATEONS
21.
2h,
23.
24.
25.
“26.
27.
CONTROLS
. TAPE OPERATION BUTTONS
. CASSETTE HOLDER
. DOLBY NR BUTTON
FM MODE BUTTON
. LOUDNESS BUTTON
|. TAPE COUNTER
. TAPE SELECTOR
. BASS CONTROL
. TREBLE CONTROL
. BALANCE CONTROL
th.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Fig. 3-1 Front View
VOLUME CONTROL
RIGHT SPEAKER
TUNING KNOB
BAND SELECTOR
TAPE, PHONO/CD SELECTOR
CARRING HANDLE
BATTERY COMPARTMENT COVER
BATTERY CHECK INDICATOR
FUNCTION BUTTON
LEFT SPEAKER
ROD ANTENNA
SPEAKER CORD AND PLUG (LEFT)
BEAT CANCEL SELECTOR
MIC JACK
INPUT SELECTOR (PHONO, LINE/CD)
FM ANTENNA TERMINAL (75 ohms)
LINE OUT JACK
28.
29.
30.
31.
32.
33.
34.
Fig. 3-2. Rear View
LINE IN/PHONO JACK
PHONO GROUND TERMINAL
PHONES JACK
DC IN (13.5V) JACK
AC INLET
VOLTAGE SELECTOR ([U] ONLY)
SPEAKER CORD AND PLUG (RIGHT)
SERVICE
MANUAL
PJ-33E8
7

Iv. PRINCIPAL PARTS LOCATION
TERMINAL PCB PRE AMP, EQ PCB
CASSETTE MAIN ANP PCB
REC INDICATOR
PCB
TUNER PCB
TONE PCB
LED PCB POINTER PCB
Fig. 4-1
DC IN JACK
(13.5V) VOLTAGE SELECTOR
SP-L PCB
BATTERY FUNCTION FUNCTION POWER TRANS POWER
INDICATOR, Swisl) PCB (PTH) PCB
Fig. 4-2
SERVICE MANUAL PJ-33FS:

V.
REPLACEMENT
OF
THE
DIAL
CORD
TIE AND PUT THE
CEMENT OR GLUE
r 353 41mm
Cc
DIAL CORD
CUT WITHIN 2mm
Fig. 5-1
LOCK WITH
CEMENT OR GLUE
Fig. 5-2
Iga LOW END POSITION
j OF THE VARIABLE
Gene CAPACITOR
Kit—
auc
WIND UP THE DIAL CORD
FOR THREE. TIMES
!
l DRUM feo CENTER LINE
}
OF
THE
MARKER
A LOCK WITH
iy CEMENT OR
| GLUE
G
a :
a7,
Fig.
5-4
yy
VIEW FROM A
(BRACKET SIDE)
Fig. 5-3
1.
Build
a
Dial
Cord
as
shown
Fig.
5-1.
4.
Set
the
Dial
Cord
as
shown
Fig.
5-2.
2. Take
off
a
screw
A, then
Remove
the
Drum from
the
5.
Set Back
the
Drum
to the Variable
Capacitor
with a
Variable Capacitor.
screw A.
3.
Set the
Drum
as
shown
Fig.
5-3,
and
make
sure
that
6.
Turn
the
TUNING
DIAL
to
low
end,
then
set
the
_the
Variable
Capacitor
is
fully
clockwise.
2
Dial
pointer
as
shown Fig. 5-4.
SERVICE MANUAL PJ-33FS

Vi. TUNER ADJUSTMENT
FRONT
L4 (MW BAR ANT)
Mw SENS(LOW)
FM OSC L3
(HIGH)
Le
sv2
Mw
Osc
FM
IF
TP2
=
MPX
FREE
FM
IF
(IN)
@
(Low)
Bl
(OUT)
[2
RUNNING
FREQ
Sy
FM
iF
AM
Ip
=
TPS
TP
=
GND
GND
&—~ | INCREASE
FM SENS
CHIGH)
[er
cT2
TUNER PCB
cT3
cT4
cTs
sw2 osc
(HIGH)
SW! OSC
(Low)
L8
Fig. 6-1 Tuner Adjustment Point
SERVICE MANUAL P3J-33FS:
10

6-1
MW
SECTION
ADJUSTMENT
(Refer
to
Figs.
6-1
&
6-2)
APPROX 600mm
AM
SIGNAL
AC
VOLTMETER
GENERATOR
7
2
=z
a
=?
ao
Fig. 6-2 MW Adjustment
Step
|
Adjustment
|
test
Point
‘Acjustmest
Result
Remarks
Item
Point
©
Set
BAND
SELECTOR
to
MW
i
AM
IF
LINE
OUT
13,74
Maximum
output
|
©
460
kHz
from
SSG
©
Tuning
knob
fully
clockwise
MW
OSC
,
©
515
kHz
from
SSG
2
(Low)
PINE
OU
uy
Maximum
output
|
5
Tuning
knob
fully
clockwise
MW
Osc
:
°
1650
kHz
from
SSG
3
LINE
OUT
CT-4
Maximum
output
|
©
Tuning
knob
fully
counter
(HIGH)
:
clockwise
4
For
best
Result,
Repeat
Step
2
and
3,
two
or
three
times
Sensitivity
el
©
600
kHz
from
SSG
5
(Low)
LINE
OUT
|
(MW
BAR
ANT)
|
Maximum
output
|
|
tine
to
signal
(See
NOTE
2)
baat
Sensitivity
5
é
©
1400
kHz
from
SSG
6
(HIGH)
LINE
OUT
CT-3
Maximum
output
©
Tune
to
Signal
7
For
best
Result,
Repeat
Step
2
and
3,
two
or
three
times
NOTES: 1. Generator modulation .. . . 400 Hz, 30%
2.
Adjust
space
between
small
coil
and
large
coil,
by
moving
small
coil.
SERVICE
MANUAL
25-33

6-2 SW SECTION ADJUSTMENT (Refer to Figs. 6-1 & 6-3)
AM SIGNAL
GENERATOR
SET
AC VOLTMETER
Fig. 6-3 SW Adjustment
Step Adjustment Test Point Adjustment Result Remarks
Item Point
© Set BAND SELECTOR to
SW1 OSC ; swl
1 (LOW) LINE OUT L8 Maximum output © 2.8 MHz from SSG
© Tuning knob fully clockwise
sw1 osc © 8.2 MHz from SSG
Ps LINE OUT CT-5 Maximum output | © Tuning knob fully counter
(HIGH) i
clockwise
3 For best Result, Repeat Step 1 and 2, two or three times
swl i © 3.0 MHz from SSG
4 Sensitivity LINE.OUT LS Maximum output © Tune to signal
© Set BAND SELECTOR to
SW2 OSC i sw2
S (Low) LINE OUT L9 Maximum output © 7.8 MHz from SSG
© Tuning knob fully clockwise
sw2 osc © 23.0 MHz from SSG
6 LINE OUT CT-6 Maximum output | © Tuning knob fully counter
(HIGH)
clockwise
a For best Result, Repeat Step 5 and 6, two or three times
sw2 A © 8.0 MHz from SSG
8 Sensitivity LINE OUT L6 Maximum output © Tune to signal
NOTE: Connect capacitor (30 pF) between CP1 @ and CP1 @) before SW Section adjustment.
SERVICE MANUAL PJ-33FS:

6-3 FM SECTION ADJUSTMENT (Refer to Figs. 6-1, 6-4 & 6-5)
SWEEP MAKER
ger GENERATOR.
On) Set te we
:s i cs
Fig. 6-4 FM IF Adjustment
STEREO stonat weak AC VOLTMETER
ea a
21 OINPUT
tr °F 2] eae ores | tbo
Tn a
FREQUENCY COUNTER
Fig. 6-5 FM Adjustment and Stereo Adjustment
Step Adjustment Test Point Adjustment Result Remarks
Ttem Point
707M
© Set BAND SELECTOR to
FM.
: MIF ates T1,T2 Maximum § Curve | © 10.7 MHz from SSG
waveform (upper/ | © Tuning knob fully clockwise
lower waveform
symmetricity)
FM OSC " © 87.3 MHz from SSG
. (Low) TINE OUT re Maximum output | , Tuning knob fully clockwise
make
©
108.5
MHz
from
SSG
3 LINE OUT CT-2 Maximum output | © Tuning knob fully counter
(HIGH) :
clockwise
4 For best Result, Repeat Step 2 and 3, two or three times
Sensitivity lo 90.0 MHz from SSG
5 (Low) LINE OUT 12 Maximum output } © Tune to signal
Sensitivity i © 106.MHz.from SSG
6 (HIGH) LINE OUT CT-1 Maximum output © Tune to signal
7 For best Result, Repeat Step 5 and 6 two or three times
MPX TP4 © Set FM MODE to STEREO
8 | Free Running | (Connect TP3 sv2 19 kHz + 0.1 kHz | © Connect a Frequency
Frequency to TPS) counter between TP4 and
TPS (GND).
Signal LED ‘ © 98 MHz, 19 dBy from SSG
7 Sensitivity SVs Light left TED © Tune to signal
NOTE: Set the internal modulation signal generator to 22.5 kHz deviation, 400 Hz.
SERVICE MANUAL PJ-33FS:
13

Vil. MECHANICAL ADJUSTMENTS
7-1 TAPE SPEED ADJUSTMENT (Refer to Fig. 7-1)
CAPSTAN MOTER
TAPE SPEED ADJUSTMENT CONTROL
Fig. 7-1
Connect: a frequency counter to line output terminals. and adjust a tape speed adjustment volume (see Fig. 7-1)
Playback a 1,000 Hz Tape Speed Test tape (AT-750774) to obtain a tape speed of 990 Hz to 1,000 Hz.
7-2, REC/PB HEAD AZIMUTH ALIGNMENT (Refer to Fig. 7-2)
REC/PB
HEAD
ScREW @
Fig. 7-2. Top View of the Heads
Playback
a’
10kHz
Azimuth
Alignment
tape
(AT-
2.
Be
careful
not
to
use
a
magnetized
driver
750778) and adjust the screw ® until the output levels or other magnetized tools in the vicinity of
of both channels are maximum. After adjustment, point the heads.
lock
the
screw
@.
3.
Be
sure
to
demagnetize
the
heads
with
a
NOTES:
1.
Be
sure
to
clean
the
heads
prior
to
head
Head
Demagnetizer
before
and
after
head
~-~-~--adjustment:
adjustment.
—~
-
mesa
SERVICE MANUAL PJ-33FS:
14

Vill.
AMPLIFIER
ADJUSTMENT
|
8-1 AMPLIFIER ADJUSTMENT POINT
UPPER
‘BEAT
[CANCEL
Sv30l
® Peter 8 oval]
connect
PB LEVEL FREQENCY
{RIGHT} COUNTER
L301
svao2 ‘svao3
(RIGHT) @
RESI
REC LEVEL
(LEFT)
8
sv302
> INCREASE 3 i
CASSETTE/MAIN AMP PCB
Fig. 8-1
Step
|
Adjustment
)
Test
Tape
and
Mode
|
Adjustment
|
7,54
point
Result
and
Remarks
:
Item. Supply Signal Point i
|
P22
1 | PBlevel 333 Hz PB Sant & Pin @ (Lch) | 0 580mV +20mV
Pin ® (Rch)
© SET BEAT CUT SW to
BIAS cri? 7
2
|
requen
REC
L301
_
Pin
@
(Signal)|
o
Connect
Frequency
|
quency
Pin
@
(GND)
Counter
© 60.5 kHz + 0.1 kHz
CrO,
: Blank Tape ayes oe A pap Kovels
requency are within
3S Remeaes LkHz, 10kHz | RECIPB | S403 Gey | LINBOUT | 5 Deby NR “ON”
-33
dBm
©
See
NOTE
2
Recording
.
: CrO,
.
Blank
Tape
°
-15.5
dBm
4 | Reclevel 400 Hz REC/PB Sage = LINEouT | +#0.54B
15.5 dBm © See NOTE 3
Recording
NOTES: 1. Use the following cassette measuring tapes.
Normal Tape : Maxell UD C-60
CrO, Tape : TDK SA C60
Metal. Tape : TDK MA C460
2. The confirmation at Normal and Metal position level should be made.
3. The confirmation at Normal and Metal position level will be —15.5. dBm +1.0 dB
SERVICE MANUAL PJ-33FS
15

IX.
CLASSIFICATION
OF
VARIOUS
P.C
BOARDS
9-1 P.C BOARD TITLE AND IDENTIFICATION NUMBERS
P.C Board Title P.C BOARD NUMBER
CASSETTE/MAIN AMP P.C BOARD R-4175270-1
TUNER P.C BOARD R-4175271-1
TONE P.C BOARD R-4175272-2
PRE AMP, EQ P.C BOARD R-4175272-1
TERMINAL P.C BOARD R4175270-2
POWER P.C BOARD © R-4175273 [U
POWER P.C BOARD R-4175337 [S][A
POWER P.C BOARD R-4175483 [C
LED P.C BOARD R-4175271-2
POWER SW P.C BOARD R-4175270-3
BAT IND P.C BOARD R-4175270-4
SP-L P.C BOARD R-4175271-4
SP-R * PC BOARD R-4175271-3
REC IND P.C BOARD R-4175270-5
POINTER P.C BOARD R-4175270-6
SERVICE MANUAL PJ-33F§ ——————____________
26

2) TUNER P.C BOARD R-4175271-1
To
PRE AMP CPI9
—1
1 ADJUSTMENT
POINTS
FM IF Ths T2
FM OSC (LOW) |L3
(HIGH) | CT-2
FM SENS (LOW)
(HIGH)
AMF
MW OSC (Low) [Li
{hie}
MW SENS (LOW)
(HIGH)|
SWI OSC (LOW)
(HIGH)
‘SWI_SENS
SW2 OSC (LOW)
(HIGH)
SW2 SENS
es
K
SERVICE
MANUAL
PJ-33FS:
18
‘ae’
TUNER
PCB
R-4175271-1
QI---28C930E, (e[e3]- NPN
Q2---25C930D BCE
EBC
25¢9300
28C930E
LOCATION OF
COMPONENTS
TARMINAL
Ox@, Or,
@®
@te@ 10 PRE AMP cPiB @t0(8) To CASSETTE/ MAIN AMP CPIS
3) TERMINAL P.C BOARD R-4175270-2
BCE
[eee ]=nen
Q501 - ---2SC536E
LINE IN
L
£68
2SC536E
LINE OUT
R L
Jt
le!
515;
R
JK6
PHONO =~LINE /CD
— ee
4) PRE-AMP, EQ P.C BOARD R-4175272-1
TO
CASSETTE/
MAIN AMP DB
cP9
To
CASSETTE/ ie
MAIN AMP
CPIO|
BCE
[sTe-*] =NPN
TO
EBC
2S¢5366
QIII, 2I1 --- 2805366
TARMINAL PCB R-4175270-2
c: 2
Ml el
TO TONE PCB PRE-AMP. EQ PCB
R-4175272-1

9-2 COMPOSITION OF VARIOUS P.C BOARDS
1) CASSETTE/MAIN AMP P.C BOARD R-4175270-1
WARNING: AINDICATES SAFETY CRITICAL COMPONENTS FOR CONTINUED SAFETY,
REPLACE SAFETY CRITICAL COMPONENTS ONLY WITH MANUFACTURER'S.
RECOMMENDED PARTS
AVERTISSEMENT: ANIL INDIQUE LES COMPOSANTS CRITIQUES DE SECURITE.
POU!
It
OUR MAINTENIR LE DEGRE DE SECURITE DE L'APPAREIL,
NE REMPLACER QUE DES PIECES RECOMMANDEES PAR LE FABRICANT
Q301-------- 2SD863F
A) Q302 to 305,
402,404,405
~-
2Sc536E
TERMINAL
wir
Q306
-----—-
280608
(oy
Se
ee
A2
f
9307
-------
2sp6l2F
cP8,15..
ae
|
CPI...
fly
Loe
Hd
Eksiel
iene
TRANSISTOR
cPl0....
2SD863F
2sD6l2F
2SA608
eye
¢]
=
NPN
TRANSISTOR
peas
2SC536E
B
rue
CP23,24.
CR26s ows,
307) , G08
SERVICE MANUAL PJ-33FS