Technics SC-EH590, SC-EH790 Troubleshooting guide, Maintenance, Cassette tape selection and care

Troubleshooting guide

Before requesting service, make the below checks. If you are in doubt about some of the check points, or if the remedies indicated in the chart do not solve the problem, consult your dealer for instructions.

Reference pages are shown as black circled numbers 6.

Common Problems

The cassette deck

No sound.	Turn the volume up.
	Switch off the unit, determine and correct the cause, then switch the unit on. Causes include shorting of the
	positive and negative speaker wires, straining of the speakers through excessive volume or power, and using
	the unit in a hot environment.
Sounds unfixed, reversed or	Check the speaker connections. 6
come from one speaker only.
Humming heard during play.	An AC mains lead or fluorescent light is near the cables. Keep other appliances and leads away from this
	unit’s cables.
	If possible in your area, turn the AC mains lead’s plug or connector over to reverse the lead’s polarity.
“ERROR” is displayed.	Incorrect operation performed. Read the instructions and try again.

Poor quality sound.

Recording is not possible.

“DECK NO TAPE” is displayed during “One touch editing”.

“DECK CHANGE TAPE” is displayed during “One touch editing”.

Clean the heads. W

Check the Dolby NR setting. C

If the erasure prevention tabs have been removed, cover the holes with adhesive tape. L

Load a cassette into deck 2. L

If the erasure prevention tabs have been removed, cover the holes with adhesive tape. L

“U70” is displayed.	Connect the flat cables firmly. If “U70” remains on the display, contact the dealer.
“F60” is displayed.	There is a problem with the amplifier. Consult your dealer.
“––:––” appears on the display.	You plugged the AC mains lead in for the first time or there was a power failure recently.
	Set the time. <
The display starts up even after	The demonstration feature (–DEMO) is on. Turn it off if it is not required. <
the unit is turned off.
The CD changer or CD player

When there is a television set nearby

The picture on the TV	The location and orientation of the antenna are incorrect. If you are using an indoor antenna, change to an
disappears or stripes appear on	outdoor antenna.
the screen.	The TV antenna wire is too close to the unit. Separate the antenna wire of the TV set from the system.

The remote control

The remote control doesn’t	Check the batteries are inserted correctly. ;
work.	Replace the batteries if they are worn.

All components are required to service the system. If service is ever necessary, bring the entire system.

The display is wrong or play won’t start.

The disc may be upside down. 8 Wipe the disc.

Replace the disc if it is scratched, warped, or nonstandard.

Condensation may have formed in the changer or player due to a sudden change in temperature. Wait about an hour for it to clear and try again.

Maintenance Cassette tape selection and care

[EH790]

“TAKE OUT/DISC” appears on the display.

There is a problem with the CD mechanism. (A power failure may have occurred.)

The tray will open automatically. Remove the CD from the tray, and after ensuring there is no CD in the tray, close it. The unit will make the disc changing noises for a few moments and then it should operate normally.

If the surfaces are dirty

To clean this unit, wipe with a soft, dry cloth.

≥Never use alcohol, paint thinner or benzine to clean this unit.

The unit can correctly play or record on the following types. It identifies the type automatically.

Normal position/TYPE I	✔
High position/TYPE II	✔

Listening to the radio

≥Before using chemically treated cloth, read the instructions that came with the cloth carefully.

Metal position/TYPE IV ✔

Noise is heard.

The stereo indicator flickers or doesn’t light.

Sound is distorted.

A beat sound is heard.

A low hum is heard during AM broadcasts.

The correct AM frequency can’t be tuned in.

Use an outdoor antenna. U

Turn the TV off or separate it from the unit.

Separate the antenna from other cables and leads.

Change the frequency step. Hold [TUNER/BAND] down for 10 seconds to change the step to 9 kHz.

For a cleaner crisper sound

Clean the heads regularly to assure good quality playback and recording. Use a cleaning tape (not included).

≥Tapes exceeding 100 minutes are thin and can break or get caught in the mechanism.

≥Tape slack can get caught up in the mechanism and should be taken up before the tape is played.

≥Endless tapes can get caught up in the deck’s moving parts if used incor- rectly. Use tapes appropriate to this unit’s auto-reverse mechanism.

References

References

RQT6866

RQT6866

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