Sanyo JA 300 Service Manual

SERVICE MANUAL
POWER AMPLIFIER
TA
300
(EUROPE)
SPECIFICATIONS
NOTE:
,
The
below
mentioned
specifications
are
mainly
based
on
the
[HF measurements
standard.
They
can
therefore
not
directly be compared with specifications based on the DIN standard or ther standards.
Continous output power ....... 25Wx 2 (at 8.ohms, Graphic equalizer controls ........ +10 dB (63/250/1000/
0.3% distortion) 4000/16000 Hz)
Total harmonic distortion ...... 0.1% (20 W output, High filter response ......,....... 7 kHz (—6 dB/oct.)
8 ohms) Loudness control response
Input sensitivity and impedance WORZTOKH? cacanecscesasd +8 dB/+4 dB
PHONO os cckaee ean ads 2.5 mV/47 kohms Signal to noise ratio ............ 90 dB |
AUX/TUNER/TAPE PLAY ... 150mV/47 kohms Power requirements ..:......... AC: 220V, 50Hz
Phono overload ifevel .......... 130 mV RMS (at 1kHz) Powerconsumption ............ 130 W
Output level AC output socket ............5. AC: 18 V, 300 mA
_TAPE.REC ...........;. 150mV Dimensions (Approx.) ........... 420 (W) x 220 (D) x
Frequency response ...... ~«e. 20—20000 Hz. 85 (H) mm
| (16-1/2” x 8-5/8" x3-3/8”’)
Weight (Approx.) .............. 4 kg (9 Ibs.)
* Specifications subject to change without notice.
WM-8507

Sanyo JA 300 Specifications

General

Damping factor	30
Power output	30W per channel (8Ω)
Frequency response	20Hz to 20kHz
Input sensitivity	2.5mV (MM)
Speaker load impedance	8Ω to 16Ω

Summary

Specifications

Dismounting Cabinet and Front Panel

Dismount Cabinet

Instructions for detaching the main amplifier cabinet using specific screws.

Dismount Front Panel

Steps for removing the front panel, including control knobs and screws.

Adjustment of Bias

Exploded View

Parts List

Major Component Assemblies

Lists major circuit board assemblies like Phono, Amplifier, and Equalizer.

Electrical Components

Details electrical parts such as transformers, fuses, and sockets.

Mechanical & Fixing Parts

Covers chassis, cabinet, screws, and other mechanical fixings.

Schematic Diagram

Audio Processing and Input PCBs

Diagrams for Phono, Function, and Graphic Equalizer circuit boards.

Amplifier and Power Supply PCBs

Schematics for the Main Amplifier and Power Switch circuit boards.

Control and Output PCBs

Diagrams for Volume, LED Meter, Balance, and Speaker interface boards.

Wiring Diagram

Main System Interconnections

Overall wiring layout connecting all major PCBs and external inputs/outputs.

PCB Wiring Details

Specific wiring connections for individual circuit boards like Phono, Main Amp, and Power Switch.

IC Block Diagram