Onkyo TA-2550

TA-2550
SERIAL NO. 3300
ONKYO SERVICE MANUAL
STEREO CASSETTE
TAPE DECK
Black and silver model
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
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: 0.045% (WRMS)
Frequency Response: 20—17,000Hz (Normal)
(30—16,000Hz + 3dB)
20—18,000Hz (High)
(30—17,000Hz + 3dB)
20—19,000Hz (Metal)
(830—18,000Hz + 3dB)
S/N Ratio: 60dB (metal tape, Dolby NR off)
Anoise 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: 6(OmV
Input impedance: 50kohms
Outputs: Line OUT: 2
Standard output level: 500mV (OdB)
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: AC 220V, 50Hz
Power Consumption: 19 watts
Dimensions: 435(W) x 132(H) x 366(D)mm
(17-1/8" x 5-3/16" x 14-3/8")
Weight: §.8 kg. (12.8 Ibs.)
Specifications and external appearance are subject to change
without notice because of product improvements.

Onkyo TA-2550 Specifications

General

Track System	4-Track, 2-Channel Stereo
Tape Speed	4.8 cm/s
Signal to Noise Ratio (Dolby B Off)	60 dB
Output	0.5V (line)
Tape Type	Type I, Type II
Noise Reduction	Dolby B
Frequency Response (Metal Tape)	20Hz - 20kHz

Summary

SAFETY-RELATED COMPONENT WARNING!

SPECIFICATIONS

SERVICE PROCEDURES

HX PRO CIRCUIT OPERATION EXPLANATION

HX PRO Basic Operation

Details the HX PRO circuit's basic functional operation.

HX PRO Operating Conditions

HX PRO BLOCK DIAGRAM

BLOCK DIAGRAM

MICRO COMPUTER (HD614042 SH57)

IC BLOCK DIAGRAM

COUNTER IC (HD614128 SA41)

ADJUSTMENT PROCEDURES

Adjustment Precautions

Required Test Equipment and Tools

Key Adjustment Items

Details on adjusting tape speed, heads, levels, bias, and HX-PRO.

Chassis Exploded View

Chassis Exploded View Parts List

Tape Mechanism Parts List

Tape Mechanism Exploded View

PC Board View (Bottom Side)

Schematic Diagram (22)