Sanyo FXC-750GD, Servise Manual

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SERVICE NOTES

1. Make sure that the power lead is connected properly to

power source, otherwise damage to radio may result. If a

battery eliminator is used as a power source in place of a

battery, it must be filtered and regulated. (The power sup-

ply capacity should be more than 5 amps.)

2. Integrated circuits (ICs) are used in this unit. Because the

ICs are direc-coupled devices, as to all electronic equip-

ment, reading within 10% of the indicated values are ac-

ceptable. Allowance must also be made for variations in

supply voltage. It is expected that any breakdown within

the IC results in drastic changes of the operating voltages

at the terminals.

3. When replacing a power output IC, remember to use the

IC specified in the parts list; Coat the IC-fin with sillicon

grease.

WARNING

ln using meters, signal generator and any tool in servicing

Ics, extreme care is needed. DO NOT SHORT THE IC TER-

MINALS TO THE PATTERN ON THE PC BOARD OR TO

EACH OTHER. THE IC WILL BE INSTANTANEOUSLY DE-

STROYED.

ALIGNMENT PROCEDURE

Alignment is performed at factory with laboratory equipment.

Therefore, before alignment is attempted, the unit should be

thoroughly checked for circuit troubles.

NOTES:

1. Check for specified source voltage-DC, 14.4volts.

2. Connect an AC voltmeter (AC VM) across speaker or

dummy load (4 ohms. 20W, wirewound resistor)...see Fig.

1-3. (ELECTRICAL ADJUSTMENTS)

3. Signal input must be kept as low as possible to avoid over-

load and clipping (use highest sensitivity of output indica-

tor).

4. Repeat adjustment to ensure good results.

5. Non-metallic alignment tools must be used (especially at

FM alignment).

6. For alignment location details, refer to CIRCUIT BOARD

PARTS LOCATION.

SERVICE NOTES AND PRECAUTIONS

INSTALLATION PROCEDURE

1. To prevent a short circuit, remove the key from the igni-

tion and disconnect the   battery.

2. Make the proper input and output wire connections for

each unit.

3. Connect the wiring harness wires in the following order:

ground, speakers, battery, ignition.

4. Connect the wiring harness connector to the unit.

5. Install the unit in your car.

6. Reconnect the   battery.

7. Disinstall by reversing the installation procedure.

 CAUTI0N

• The rear-panel which also heatsink is very hot. Don’t burn!!

• If your car’s ignition does not have an ACC position, con-

nect the ignition wires to a power source that can be turned

on and off with the ignition key. If you connect the ignition

wire to a power source with a constant voltage supply, as

with battery wires, the battery may die.

• If the console has a lid, make sure to install the unit so

that the cover will not hit the lid when closing and open-

ing.

• If the fuse blows, first make sure the wires aren’t touching

to cause a short circuit, then replace the old fuse with one

with the same rating.

• Do not let unconnected wires or terminals touch metal on

the car or anything else conducting electricity. To prevent

a short circuit, do not remove the caps on the ends of the

unconnected wires or the terminals.

• Connect the speaker wires correclly to the terminals to

which they correspond. The unit may be damaged or fail

to work if you share the   wires or ground them to any

metal part in the car.

• After the unit is installed, check whether the brake lamps,

blinkers, wipers, etc. on the car are working properly.

• Insulate unconnected wires with vinyl tape or other simi-

lar material .