Sony TC-PB5 User manual

SPECIFICATIONS
Playback System: 4-track 2-channel stereo
Fast-forward and
Rewind Time: Approx. 90 sec. (with C-60 cassette)
DOLBY NR OFF
e@ With TYPE IV cassette (Sony METALLIC)
59 dB at peak level
eWith TYPE II cassette (Sony EHF)
57 dB at peak level
DOLBY NR ON
Improved by 5 dB at 1 kHz,
10 dB above 5 kHz
Signal-to-noise Ratio:
SAFETY-RELATED COMPONENT WARNING!!
MPONENTS IDENTIFIED BY SHADING AND MARK
>, ON THE SCHEMATIC DIAGRAMS, EXPLODED
VIEWS AND IN THE PARTS LIST ARE CRITICAL TO
SAFE OPERATION. REPLACE THESE COMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS APPEAR
AS SHOWN iN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY,
mel
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET
UNE MARQUE /\ SUR LES DIAGRAMMES SCHE-
MATIQUES, VUES EXPLOSEES ET LA LISTE
i=
;
1
LES
FONCTIONNEMENT. NE REMPLACER CES
— PIECES SONY—DGONT-
Frequency Response:
DOLBY NR OFF
e@ With TYPE IV cassette (Sony METALLIC)
20 — 19,000 Hz
30 — 17,000 Hz (+3 dB)
e@With TYPE II cassette (Sony EHF)
20 — 18,000 Hz
30 — 16,000 Hz (+3 dB)
© With TYPE | cassette (Sony HFX)
20 — 17,000 Hz
Wow and Flutter: 0.05% WRMS
Inputs: Microphone inputs (phone jacks)
Sensitivity 0.4 mV (—65 dB)
For a low-impedance microphone
Outputs: Line outputs (phono jacks)
Output level 0.435 V (—5 dB) at load
impedance 50 kQ
Load impedance over 10k
Headphone output
Output level 77.5 mV (—20 dB) at a load
impedance of 8 2, with the LINE OUT/
HEADPHONES control at MAX
— Continued on next page —
H
S O
i
) DES PIECES SONT CRITIQUES POUR LA SECURITE
N DANS CE MANUEL
ES
id

GENERAL
Power Requirements:
Power Consumption:
Dimensions:
Weight:
120 V ac, 60 Hz (US, Canadian model)
220 V ac, 50/60 Hz (AEP model)
240 V ac, 50/60 Hz (UK model)
110, 120, 220, 240 V ac ~, 50/60 Hz
(E model)
13W
Approx. 215 (w) x 105 (h) x 280 {(d) mm
(8% (w) x 4% (h) x 11% (d) inches)
including projecting parts and controls
Approx. 3.5 kg (7 Ibs 11 oz)
OdB = 0.775V
Tape Transport Mechanism Type: TCM-110V6.
ry ee ee ey ee ey ee a a ee et ant ee a gL ee ee ee Pee ee ee en ny Pe ee
MODEL IDENTIFICATION
— Specification Label —
SONY.
STEREO CASSETTE PLAYER
SERIAL NO.
MADE
IN KOREA | PRINTED IN JAPAN 3-579-327-01
US, Canadian model: AC 120V 60Hz 13W
AEP model: AC 220V~ 50/60Hz 13W
UK model: AC 240V~ 50/60Hz 13W
E model: AC 110, 120,220,240V~ 50/60Hz 13W
moveL No. |C-PBS

e HOW TO OPERATE THE SET
RANDOM MEMORY MUSIC SENSOR (RMS)
TC-PB5
MEMORY Button @
he RMS Display Window
UP Button and
CHECK Button
DOWN Button
DOWN
RMS Button @}
@ MEMORY Button
Press to memorize the displayed selection number. When the
number to be memorized has been selected by the UP or DOWN
button, the selection number blinks in the RMS display window.
When the MEMORY button is pressed, the selection number lights
steadily for about three seconds to show that the number has been
memorized, after which the number begins to blink again.
Up to 15 selection numbers can be memorized.
If you want to repeat playback of the same selection, press the
MEMORY button as many times as you want the selection to be
played back.
@ If you once turn off the unit or depress the & button or RMS but-
ton, the memory will be cancelled.
@ CHECK Button
Press to check which selection numbers have been memorized.
Every time this button is pressed, a memorized program number is
indicated. When this button is kept depressed, the memorized
selection numbers will be indicated in turn.
@After the last selection number memorized is indicated, the
number blinks for about three seconds,then lights steadily.
@ To check during the RMS play, first stop the tape, then press this
button.
© RMS Button
Press to get ready for RMS operation. When the RMS button is
pressed, “0” is displayed. If you wish to cancel the memorized
selection numbers, press this button again.
@ UP Button and DOWN Button
Press to select the selection number.
“4” means the first selection recorded on the cassette tape.
Every time the UP button is pressed, the selection indicated in-
creases by one to ‘15”, after which it returns to “1”.
Every time the DOWN button is pressed, the selection indicated
decreases by one to ‘'1”", after which it returns to “15”.
© RMS Display Window
The selection number selected is displayed in this window.
TC-PB5
BASIC RMS OPERATION—For example: to play selection three
first, selection six second and selection one third.
@First, insert a cassette and depress the POWER switch to ON.
Button Display window
RMS
UP eee
Press three @2 0%:
e times.
once
Illuminates for about three seconds.
MEMORY
° ~
Memorizing the 6" selection
Selection 3
After step @ blinks
=
ris
e
Press
three
|
ta
.
:
ES
3
i
times.
|
see
selection
3
once
MEMORY
illuminates
for
about
three
seconds.
5)
al
Selection 6
Memorizing the 1St selection After step @ blinks
DOWN
6) Press five
times.
Selection 6 once
MEMORY IHuminates for about three seconds.
oe | j ez The 1St selection is memorized q
Selection 1
To check which selection numbers have been memorized.
at]
Selection 3
Press each time or keep depressed:
Selection 6
In
this
way,
up
to
15
selection
numbers
can
be
memorized.
When
15
selections
are
memorized,
the
last
selection
number
blinks
rapidly
to
show
that
no
more
selection
can
be
memorized.
El The 3°95 selection is memorized.
| The 6! selection is memorized.
blinks
three times :
E—-H-ai—
Selection 1
Selected selection
“1” begins to blink, indicating that you can memorize
more selection numbers.

Shut-Off Detection and Precaution On Repairing
In this set, the shut-off detection is made optically.
The take-up reel spindle has the five holes. The light
of the lamp received by the light guide is inter-
mettently applied to the photo transistor by means of
the rotation of the reel spindle. The pulse generated
by the photo transistor Q803 is amplified by Q801
and is fed to the mechanism control IC302.
Accordingly, when it is necessary to repair the unit
after removing the ornamental plate, connect an af
oscillator to the terminal Q) of IC303 as shown
below, so as not to operate the shut-off mechanism.
light guide “ote
%
photo transistor Ny
~~!
“N
\
“XN
10Hz — nes)
10dB
oe,
ni 0.01uF
OSC
ornamental plate
take-up reel spindle
hole
MAIN BOARD (Conductor side)
Handling Precautions for MOS ICs
Generally, the insulation resistance of the oxide
layer in MOS IC structures is very high, and the oxide
layer is very thin. Because of this, it is possible that
the static voltages usually present on clothes and the
human body will be enough to generate a potential
difference across the insulator, high enough to cause
a breakdown of the insulating layer.
The following precautions should be taken while
handling these ICs.
(Particular care should be taken under conditions
of low humidity.)
Precautions in Replacing MOS ICs
1. Store newICs by inserting them into a urethane-
polyester cushion (which is somewhat conduc-
tive), or wrapping it in aluminum foil, so that
all the pins are at the same potential.
(The ICs should be stored in that manner until
mounted on the circuit board.)
Fig. A partially conductive
unrethane-polyester
cushion
IC
Fig. B aluminum foil
2. Check the soldering iron for possible power-line
leakage current. Make sure that there is no
leakage path by connecting an ohmmeter to the
tip of the soldering iron and the plug as shown
in Fig. C. If there is a leakage path, use some
other soldering iron.
VOM
(2.x 10,000 range)
3. Equalize any potential difference between the
clothes, the tools in use, the work bench, the
set being worked on, and the packaged IC by
touching them all in succession with the hands
or a conductive wire or tool.
4. The following are effective methods for handl-
ing ICs that remove the potential difference
across the oxide layer.
@ Use a paper clip modified by soldering ina
wire braid insert.
wire braid
clip
>)
ye
le
S soldered
soldered
sli
, Make sure that there is
Fig. D no solder on the inside.
clip
partially conductive
. urethane-polyester
Fig. E cushion or aluminum
oll
wire braid
clip
(ooo res
WY
Make sure that all the pins are in
contact with the wire braid (all
. the pins will then be at the same
Fig. F __ potential.).

TC-PB5
@ Take a short length of fine bare wire and Precaution while Checking C-MOS ICs
wind it around the IC so that it shorts all the
pins of the IC, while it is still in the urethane-
polyester cushion or aluminum foil. This
ensures that all the pins are at the same
The C-MOS ICs (Complementary MOS) are MOS
ICs that have their output sections made up of
N-channel and P-channel push-pull stages to increase
their speed of operation. If the output terminal of
potential.
these ICs comes into contact with B+ or B- voltage,
[aspondes
we
hookup
then
the
FET
which
is
ON
at
that
time
will
either
wire, etc.) become shorted or open.
This is valid for all the output sections that are
connected together by the interconnections. Even
the circuits that are physically separated (and not on
the same board) can be destroyed simultaneously.
Example:
partially conductive
urethane-polyester
cushion or aluminum
foil
If this line is grounded, or touches
B+ or B- bus..., the output stage
of this IC will be destroyed.
Fig. |
Fig. G
@ When it is necessary to handle the [C with
the fingers, do not touch any pin, and hold
the IC at the ends of its plastic-package case
as shown in Fig. H.
St,
Fig. H
Method of Mounting
Insert the IC while holding it with the modified
clip, and solder all the pins with the clip still
shorting the pins. (Similarly, solder all the pins
while the bare shorting wire is still wound
around them.). Remove the clip or the bare
shorting wire only after all the pins have been
soldered.
meg pee

C-PB5
SECTION 1
OUTLINE
BLOCK DIAGRAM
(HD-1
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TC-PB5
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
BOTTOM PLATE
bottom plate
TOP COVER
top cover
nt ty,
BOLay an
Mic Moun,
Mat sae

c-PBs |
CASSETTE LID
@ Press
the EJECT
knob.
cassette lid
MECHANISM SECTION-1
Remove the mechanism section.
@ Remove the lead wires from
cord stopper.
lead wires
—10—

TC-PB5
SWITCH BOARD
@O PTPWH3 x 8 switch board
MECHANISM SECTION-2
mechanism section
front panel

‘C-PB5
SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
. Clean the following parts with a denatured-
alcohol-moistened swab:
playback head pinch roller
tape guide rubber belts
capstan idlers
. Demagnetize the playback head with a head
demagnetizer.
. Do not use a magnetized screwdriver for the
adjustments.
. After the adjustments, apply suitable locking
compound to the parts adjusted.
. The adjustments should be performed with the
tated power supply voltage unless otherwsie
noted.
Torque Measurement and Back Tension
Torque Adjustment
Torque
35—55 g-cm
CQ102C | (0.48-0.76 oz-inch)
F 2.5—4.5 g-cm
Poe (0.04—0.06 0z-inch)
2. If the specified back-tension torque is not ob-
tained, change the hooking position.
supply-reel spindle
ack-tension lever
weaker «<«———w> stronger
Change the hooking position.
(1g-cm per one slide.)
—12—