Secrets of repairing audio equipment 1. Articles of the Free Technical Library

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Audio equipment repair secrets 1

Secrets of repairing household radio-electronic equipment

AIWA NSX-990

Fault: Stopped reading discs.

Remedy: To check the operation of the laser, carefully remove the upper clamping bar (the one against which the disc is pressed during spin-up). Turn on the player, and press the "EJECT" button (the tray will leave), press this button again. That is, perform the disk loading procedure. Carefully inspect the laser: it must be accessible for viewing. 1 - the laser should glow red (be careful, eyes!), but the brightness may be weak, so you need to cover the external lighting. 2- focusing should work, that is, the lens should move up and down. The 3-lens must be clean. To clean the lens, you can use alcohol, but very carefully and very soft cotton wool, trying not to leave muddy stains on it. To check the tracking system, hold a mirror over the lens (at a distance of 2-3 mm) (ie, stage the inserted disk). The tracking system should raise and lower the laser. You can also forcibly turn on the interlock contacts that close when the LED cover is closed and turn on the device, the laser will be visible. On the carriage where the head is located, there should be a trimmer regulator that regulates the laser excitation voltage; you can turn it; before this procedure, remember the initial position of this regulator. When operating in a humid climate, the contact between the current-carrying bus from the processor that controls the movement of the head and the laser head itself is broken. The processor itself rarely fails.

Acoustic system.

There are 2 pairs of columns. the first pair is rated at 45W (4 ohms) and the second pair is rated at 25W (4 ohms). The 100W amplifier is designed for both 8 ohm and 4 ohm loads and has 2 outputs (left and right channels, respectively). Speakers need to be connected to an amplifier.

Connect the speakers in series, when connected in parallel, you can burn the final stage, since the resistance will be less than 2 ohms, which is unacceptable for the amplifier. Connection diagram for one of two channels (the second is similar): (-) amplifier, (-) speaker1 (+), (-) speaker2 (+), (+) amplifier. It is necessary to observe the polarity, the relative position of the columns is unprincipled.

PANASONIC SA-CH74

Fault: When turned on, it gives error F-61, it does not accept commands.

F-61 clearly indicates the absence of supply voltage on the main power supply board. Check the breaking resistors supplying the circuits forming U+15V,-15V from the base voltage +45,-45V.

Remedy: Do not solder the Q505 transistor (it is on the same heatsink with the output chip.

AIWA LCX-100

Fault: Disc does not spin.

Remedy: Using a megohm probe of an oscilloscope, check the output contacts on the laser head, on which leg the disk will start to be recognized, put a resistance of less than 1 MΩ on this leg. Check the flexible cable connecting the control board to the laser head. Blow the lens and head inside with a blower.

LG GX-CH180Z(BK)

Fault: Radio for two CDs. Each disc has its own tray, and inside between them there is a carriage with a CD mechanism. This entire structure is driven by an elastic caterpillar. In the direction of travel, the tracks are equipped with two three-pin and one two-pin mikriks. All mikriki earned after cleaning the contacts. By forcibly controlling the loading engine, you can perform any operations with the mechanism, and in normal mode, when the OPEN key is pressed, the tray moves out by two centimeters and rises.

Remedy: Perform sequential bending-unbending of the mikriks.

PIONEER XR-P560F/DL

Fault: Does not read music fragments located on the second half of the disc.

Remedy: Disassemble, wash and lubricate the laser head moving sled.

SONY HCD-GR7

Fault: Does not read discs.

Remedy: Replace the photocell array in the laser head. Replace the whole KSS-213ARP head

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