Onkyo TAR 33 Service Manual

Page 1

TA-R33

SERIAL NO. 3184

ONKYO® SERVICE MANUAL

STEREO CASSETTE

TAPE DECK

MODEL TA-R33

Silver and Black models

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARK 3- ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS
LIST ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE THESE COM-
PONENTS WITH ONKYO PARTS WHOSE PARTS
NUMBERS APPEAR AS SHOWN IN THIS MANUAL.

MAKE LEAKAGECURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLY IN-
SULATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE
CUSTOMER.

ON KYO.
AIIIIIII IIIIMI'IIIIIIIIS

SPECIFICATIONS

Track System:|
Recording System:l
Erasing System!
Tape Speedzl

Wow and Flutterzl
Frequency Response:l

S/N Ratio:I

Input Jacks: I

OutpUtszl

Motors:l

4-track, 2-channel stereo
AC bias
AC erase
4.8 cm/sec
0.05% (WRMS)
20715,000Hz (Normal)
(3044,000Hz : 3dB)
20-16,000Hz (High)
(SO-15,000Hz t 3dB)
20-17,000Hz (Metal)
(304 6,000Hz i 3dB)
Dobly NR out: 60 dB (metal position tape)
A noise reduction of 10 dB above 5 kHz
and 5 dB at 1 kHz is possible with Dolby B.
A noise reduction of 20 dB at 5 kHz is
possible with Dolby C.
Mic Jacks: 2
Input sensitivity: 03 mV/600 ohms
Input impedance: 2.7 kohms
Line IN: 2
Input sensitivity: 60 mV
Input impedance: 50 kohms
Line OUT: 2
Std output level: SOOmV (0 dB)
Opt load impedance: over 50 kohms
Headphone Jack: 1
Opt load impedance: 8-200 ohms
DC servo: 1
DC motor: 2

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TA-R33

Heads: Rec/PB head: Special Hard Permalloy
Erase head: Ferrite

Semiconductors: TR: 64 Diodes: 34 1C: 13 LED: 17

Power Supply: AC120V/60 Hz

Power Consumption: 25 watts

Dimensions: 418(W) x 112(H) x 270(D) mm
(16-1/2" x 4-3/8" x10-5/8)

Weight: 5.1 kg. (11.2 lbs.)

Specifications and external appearances are subject to change without
notice because of product improvements.

SERVICE PROCEDURES

1. Replacing the lamp
This unit used the lamp listed below.

Circuit No, Parts No. Description
PL-901 210090 PL14V 150mA

Caution; Before replacing the lamp. Be sure to unplug the
power supply cable,

2. Instruction resistance measurement

Connect the insulating-resistance tester between the plug of
power supply cord and chassis

Specifications; 500V more than IOMQ

3. Replacing the Hall ICs
Cautions: As the position of leg of DN6838 and DN838
differ, use the same Hall IC when replacing,

(DNGEJG (227555) DN838 (222470)

Ct" Printed slde
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5mm 9
3mm
1 Hum" SN27|9025I

sunrsona

NCSE N<2023

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NCSEN-ZOZS

SPECIAL MODES OF OPERATION

Auto-reverse operation

This unit includes an ante-reverse function that automatically
reverses the direction of tape travel in the playback or record
modes when the end of the magnetic tape is reached Tape travel
is reversed as soon as a photo sensor detects the presence of the
clear leader, In other words, as soon as the sensing light ray passes
through the tape, the direction of tape travel is reversed.

The reversal time interval is extremely short so that the silent gap
during playback is barely noticeable. if the cassette tape does not
have a clear leader section, tape travel is reversed the instant the
end of the tape (including leader) is reached.

When defective cassette tapes having pin holes or other damage
which allows light to pass through the tape, auto-reverse may be
activated at that point. To prevent this from happening, play and
record these tapes using the one side tape transport mode in
which auto-reverse is not activated under any circumstances.

Notes:

0 Because of slight physical differences between cassette halves,
cassettes recorded in the forward direction should be played
back in the forward direction to obtain the best results.

0 When recording, the direction of tape travel only switches
from forward to reverse. To keep track of which side is being
recorded so that you do not mistakenly use an already record-
ed side, it is a good idea to always place side A facing outward
for recording operations.

Blank skip operation

When the blank skip button 21 is pressed while a tape is being
played back, blank (unrecorded) sections of tape of more than
20 seconds in length are automatically skipped over in the fast
forward mode. Tape winding stops at the beginning of the next
recorded section and playback is automatically resumed.

When playing back a long section of quiet music, press this
button again to turn the blank skip function off to prevent
mistaken operation.

The Automatic Tape Selection System

This deck automatically detects the type of cassette that has been
loaded in cassette holder and sets the bias and equalization to the
correct settings. The cassette type is then displayed by the Tape
Selector Indicator 7 . Tape selection is performed by detecting
the presence or absence of identification pits on the back of the
cassette shell. Cassettes manufactured before this identification
system was adopted and bargain cassettes that do not incorporate
these pits can not be used with this deck.