Onkyo TA-2800 Service Manual

ONKYO
TA-2800
SERIAL NO. 3302
SERVICE MANUAL
a
STEREO CASSETTE
TAPE DECK
MODEL TA-2800
Black model
UDN, UDC, UD
UG
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK “4 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 LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE’ THAT
EXPOSED PARTS ARE ACCEPTABLY IN-—
SULATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE
CUSTOMER.
ONKYO.
AUDIO
COMPONENTS
220V AC, 50Hz
120V AC, 60Hz
120 or 220V AC, 50/60Hz
UQA, UQB | 240V AC, 50Hz |
SPECIFICATIONS
Track Format: 4-tracks, 2-channels
Erasing System: AC erase
Tape Speed: 4.8 cm/sec. (1-7/8 I.p.s.)
Wow and Flutter: 0.04% (WRMS)
Frequency Response: 20—17,000Hz (Normal)
(30—16,000Hz + 3dB)
20 — 18,000Hz (High)
(30—17,000Hz + 3dB)
15—21,000Hz (Metal)
(20—20,000Hz + 3dB)
S/N Ratio: 60dB (metal tape, Dolby NR off)
A noise reduction of 10dB above 5kHz
and 5dB at 1kHz is possible with Dolby B
NR. A noise reduction of 20dB at 5kHz is
possible with Dolby C NR.
Input Jacks: Line IN: 2
Input sensitivity: (OmV
Input Impedance: 50kohms
Outputs: Line OUT: 2
Standard output level: 1100mV (O0dB)
Optimum load impedance: over
50 kohms
Headphone Jack: 1
Optimum load impedance: 8 to 200
ohms
Motors: DC servo motor: 1
DC motor: 2
Heads: REC/PB: Special Hard Permalloy x 1;
Erase head: Ferrite x 1
Power Supply Rating: U.K. and Australian models:
AC 240V, 50Hz
U.S.A. and Canadian models:
AC 120V, 60Hz
Worldwide models:
AG 120V and 220V switchable, 50 / 60Hz
Power Consumption: 24 watts
Dimensions: 435(W) x 132(H) x 366(D)mm
(17-1/8" x 5-3/16" x 14-716")
Weight: 6.2 kg. (13.7 Ibs.)
Specifications and external appearance are subject to change
without notice because of product improvements.

Onkyo TA-2800 Specifications

General

Brand	Onkyo
Model	TA-2800
Category	Tape Deck
Language	English

Summary

Specifications

Safety Related Component Warning

Service Procedures

Power Supply Cord Replacement

Procedure for replacing the power supply cord, emphasizing correct insertion direction for safety.

Insulating Resistance Measurement

Guideline for measuring insulating resistance between the power supply cord plug and chassis.

HX PRO Circuit Operation Explanation

Recording Frequency Characteristic and Bias

Explanation of how bias current affects recording frequency response in the high frequency region.

HX PRO Basic Operation

Detailed explanation of HX PRO circuit operation, including signal detection and waveform peak detection.

HX PRO Operating Conditions

Details on operating conditions for HX PRO, specifying frequency and signal level thresholds.

HX PRO Block Diagram

Block Diagram

Micro Computer HD614042SH57

Pin Connection

Detailed pinout and function for the HD614042SH57 microcomputer.

Mechanical Position Code

IC Block Diagram

Counter Details

Terminal Name and Function

Table listing terminal names and their functions for the counter IC.

Display Tube Pin Connection

Adjustment Procedures

Precautions for Adjustment

Important safety and handling precautions before performing adjustments.

Required Test Equipment

List of necessary test equipment and tools for performing adjustments.

Adjustment Table

Detailed table outlining adjustment items, instruments, tapes, modes, and points.

Chassis Exploded View

Chassis Exploded View Parts List

BG-555G Display Tube

Display Tube Pin Connection

Packing View

Schematic Diagram Control Section 2/2

Schematic Diagram Audio Section 1/2

Tape Mechanism Exploded View