Technics SUCH 80 Service Manual

Page 1

ORDER NO. MDQ40408SCB

Service anual

Dfl- Cassette Deck/Amplifier

SU-CH80

SB-CHEO
J, Colour
(K) . . , Black Type
Area
Suffix for
Model No. Area COIOUI
(E) Europe
(EB) Great Britain (K)
(EG) Germany and Italy
(GN) Oceania
T *
Remote Control SU-CH80 SL-CHBO Dolby noise reduction manufactured under license
Transmitter from Dolby Laboratories Licensing Corporation.
(The configuration of the speakers differs according to the area.) Dolby' and the double-D symbol are trademarks of
Dolby Laboratories Licensing Corporation.
Because of unique interconnecting cables, when a component
requires service , send or bring in the entire system.
TAPE DECK : AR300 MECHANISM SERIES
I SPECIFICATIONS Record/playback Solid permalloy head
I AMPLIFIER SECTION I (Rotary head)
Erasure Double gap ferrite head
1 kHz continuous power output M010! DC servo motor
both channels driven 2 x35 W (THD 1%, 6:2) RecordingsystEm AC bias. 100 kHz
PMPO (for Oceania area only) 400 w (THD 10%, so) Erasesystem AC erase. 100 kHz
Total harmonic distortion I Tapespeed 4.8 cm/s
half power at 1 kHz 0.05% (69) Frequency response
Frequency response NORMAL 30 Hz - 14 kHz (+3 :18, - 6 dB)
AUX 52 HZ _ 20 kHz (-3 d3) cio2 30 Hz - 15 kHz (+3 dB, - 6 dB)
Input sensitivity and impedance SIN (CrO2 type tape)
AUX 250 mV/22 k5) Dolby NR off 52 dB (A~WTD)
Graphic equalizer (Preset GE) 1 10 dB Dolby NR on 61 dB (CCIR)
(100 Hz, 250 Hz, 1 kHz, 3.3 kHz, 12.5 kHz) Wow and flutter 0.1%(WRM3)
Load impedance , 69 Fast forward and rewind time
Approx. 1 1 0 seconds with 6-60 cassette tape
I CASSETTE DECK SECTION I GENERAL
Tracksystem . 4 track, 2 channel _ POWEI' OOHSUMPIIOD 130 W
Heads Powersupply AC 50Hz. 230 -240 V
Playback ' Solid perrnalloy head Dimensions (Wx H xD) 270 x 1844 X 361.4 mm
(Rotary head) Weight 6.3 Kg
Note : - , .
1 . Specifications are subject to change with out n oti c e. System Tuner/CompactDisc Changer ) Cassette Deck/Amplifier Speakers
2. Weight and dimensions are approximate. SC-CHBO E SD~CH80 E
5. Total harmonic distortion is measured by the SL~CH80 E | SU-CHBO E
digital spectrum analyzer. SD-CHBO EB . SB-CHBO E

SC-CHQO EB I

SL-CHBO E SU-CH80 EB

SC-CHSO EG SD-CHSO EG

' SL-CHSO EG SU-CHBO EG
anasonlc sc-ci-iso GN SL-CHao GN SU-CH80 GN SB-CH79P

Made in PAES

Page 2

SU-CH80

I CONTENTS

0 BEFORE REPAIR ANDADJUSTMENT..
0 PROTECTION CIRCUITRY.
- ACCESSORIES...
- CAUTION FOR AC MAINS LEAD
- CONNECTIONS
- LOCATION OF CONTROLS

- SELF-DIAGNOSISMODE... ..... 38
- GENERALINSPECTION .....
0 WIRE CONNECTION DIAGRAM
0 BLOCK DIAGRAM ...................
- MECHANISM PARTS LOCATION.
- MECHANISM PARTS LIST ......
0 DISASSEMBLYINSTRUCTIONS 0 CABINETPARTS LOCATION.
0 TERMINAL GUIDE OF le, TRANSISTORS & DIODE 0 REPLACEMENT PARTS LIST
- SCHEMATICDIAGRAM ....................................................... 15 ~ 27 - RESISTORS&CAPACITORS....

0 PRINTEDCIRCUIT BOARD..., .26 ~ 34 - PACKING MATERIALS&ACCESSORIES.
0 TERMINAL FUNCTION OF |C'S.. ..... 35 . PACKAGINIG ..........................................

I MEASUREMENTSANDADJUSTMENTS .......................... 36 & 37

IBEFORE REPAIR AND ADJUSTMENT

Disconnect AC power, discharge both Power Supply Capacitors 0541 and 0542 through a 109, SW resistor
to ground.

DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid
state devices.

After repairs are completed, restore power gradually using a variac, to avoid overcurrent.

Current consumption at 230V, 50Hz (E, EG areas) in NO SIGNAL mode should be less than 310 mA or
Current consumption at 240V, SCI-l2 (EB, GN areas) in NO SIGNAL mode should be less than 300 mA.

I PROTECTION CIRCUITRY

The protection circuitry may have operated if either of the following conditions are noticed :
- No sound is heard when the power is turned on.
- Sound stops during a performance.

The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker
connection wires are "shorted", or if speaker systems with an impedance less than the indicated rated impedance of
the amplifier are used.

If this occurs, follow the procedure outlines below :

1. Turn off the power.

2. Determine the cause of the problem and correct it.

3. Turn on the power once again after one minute.

Note :
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.