Custom Autosound USA-630II second series User Manual

Page 7

1 PUSH-POWER ON/OFF -- TURN VOLUME CONTROL - MENU SCROLL
2. AM/FM1/FM2/FM3 BAND SELECT / AF ON EUROPEAN TUNER SETTING
3. MODE CD / AUX-IN / USB PLAYER / iPOD / RADIO SELECT
4. SEEK/MANUAL UP-DOWN TUNING CONTROL / TRACK UP-DOWN / CLOCK ADJUST

PUSH SELECT FUNCTION CONTROL- (LOUDNESS, EQ, RDS ETC.)

5. ID3 / TIME/FREQUENCY RECALL BUTTON
6. CD DISC UP / USB FOLDER UP/ RADIO PRE-SET 1
7. CD DISC DOWN / USB FOLDER DOWN / RADIO PRE-SET 2
8. CD TRACK UP / USB TRACK UP / RADIO PRE-SET 3
9. CD TRACK DOWN / USB TRACK DOWN / RADIO PRE-SET 4
10. ID3 / FREQUENCY DISPLAY / CLOCK
11. USA / EUROPE FREQUENCY CHANGE

CONTROLS

fig.2

Receiver Special Functions
1. Automatic Mono/Stereo(Built-ln)& Stereo Indicator
The built-in Automatic Mono/Stereo (FMO -Frequency Modulation Optimizer) is used
to improve stereo FM reception in weak signal areas without manually changing
the mode. When the FM station is too weak to receive a clear stereo signal, and
noise and interference increases, the USA-630 will change its mode to Mono automati-
cally. When the USA-630 is tuned to a strong FM signal,the Stereo Indicator (fig.4) will
appear on the LCD.

2. USA/EURO FREQUENCY SELECTOR
This feature is used to select how the radio receives signals for either USA or
European channel spacing. see fig.2
(1) Disconnect the main power and the memory power.
(2) Move the channel space switch to “USA” position.This changes the channel space

to 200KHz for FM and 10KHz for AM. Move channel space switch to “EUR”
position to change the channel space to 50KHz for FM and 9KHz for AM.

Antenna Noise
A static or crackle heard through the speakers, usually when the car is running, but
sometimes present with the ignition off. If a crackling static if present, follow the steps
outlined below to confirm the antenna as the source of the noise.
1. Start the car engine.
2. Switch on the USA-630.
3. Adjust the volume so that noise is audible.
4. Reduce volume setting of the car stereo but do not switch it off. If noise decreas

. .

es or disappears, the signal is most likely being picked up by the car antenna. If

. .

the noise persists after following the steps listed below, proceed to ignition Noise.

Elimination
1. Test or have tested the antenna lead for any breaks or shorts. Signs of crimping,

. .

kinking fraying or rust usually indicates damage to the cable. Replace the

antenna or cable if necessary.

Ignition Noise
A popping or crackling noise heard through the speakers. The noise will vary as the
engine rpm varies. The noise will Only be present with the engine running

Elimination
1. Install an L.C. Filter Network in the power lead of the USA-630. The filter should be

rated at a minimum of 3 amps.
2. Inspect spark plug and distributor cable for signs of wear or damage. Replace as

necessary using resistor cable only. Metal conductor ignition cables increase

static interference.

NOTE: Do not use spark plug or distributor noise filters as these can create more prob-
lems than they can solve. They decrease the quality of the spark generated by the
spark plugs and they may create more static than they eliminate.

Electrical Noise

A popping heard when the lights, turn indicators, windshield wipers, cigarette lighter,
etc. are switched on indicate a vehicle wiring deficiency. Most occurrences are minor
and preset no risk to the stereo system other than the annoyance to the listener.
However, severe cases may damage the speakers, minor occurrences can be reme-
died. A professional must attend to severe occurrences, as they present a threat to not
only the stereo system but to the vehicle wiring itself.

Elimination
1. Install an L.C. Filter Network in the power leads of the USA-630. The filter should

be rated at a minimum of 3 amps.

2. If the noise persists, consult a professional automotive service technician.