Vitek PCD790-KR Service Manual

PCD790-KR

MINI HI-FI SYSTEM

AM / FM CD / MP3 PLAYER CASSETTE RECORDER

Service Manual

PCD790KR FM STEREO RADIO WITH CD PLAYER

ALIGNMENT INSTRUCTION
FM SECTION

STEP ALIGNMENT TEST EQUIPMENT SIGNAL-IN SIGNAL-OUT ADJUST REMARK

FREQ

1 IF 10.7MHz 1)FM IF SWEEP INJECT THE IF SIGNAL ARE ADJUST T104 TO 1)BAND SW IN FM

GENERATOR. SWEEP SIGNAL TAKEN OUT GET MAX OUTPUT POSITION.

2)ALIGNMENT THROUGH 1000pF FROM PIN 19 OF 101 AT 10.7MHz 2)VOL CONTROL
OSCILLOSCOPE. CAPACITOR TO IN MIN POSINTION.

3)POWER SUPPLY PIN5 OF IC101 3)TUNE FREQ TO
HIGH END.

2 87.5MHz 1)FM RF SWEEP INJECT THE RF SAME AS STEEP 1. ADJUST L103VT TUNE FREQ TO

GENERATOR. SIGNAL VOTAGE TO DC 2.3VLOW END.

2)ALIGNMENT DIRECTLY TO

OSCILLOSCOPE FM ANT INPUT

3)POWER SUPPLY

3 90MHz SAME AS STEP 2. SAME AS STEP 2. SAME AS STEP 1. ADJUST L102 TUNE FREQ TO

GET MAX OUTPUT. 90MHz.

4 106MHz SAME AS STEP 2. SAME AS STEP 2. SAME AS STEP 1. ADJUST TC101 TUNE FREQ TO

GET MAX OUTPUT. 106MHz.

5 REPEAT STEP 3 AND THEN STEP 2AND 3, UNTIL NO FURTHER IMPROVEMENT CAN BE MADE.

PCD790KR AM STEREO RADIO WITH CD PLAYER

ALIGNMENT INSTRUCTION

AM SECTION

STEP ALIGNMENT TEST EQUIPMENT SIGNAL-IN SIGNAL-OUT ADJUST REMARK

FREQ.

1 450KHz 1)AM IF SWEEP PLACE THE AM TAKE OUT THE ADJUST T103 TO 1)BAND SW IN AM

GEN WITH ANT. COIL SIGNAL-FROM GET MAX OUTPUT POSITION.
LOOP ANTENNA. CLOSE TO THE PIN19 OF IC101 AT 450KHz 2)VOL CONTROL

2)ALIGNMENT GEN. ANTENNA. IN MIN POSITION.
OSCILLOSCOPE 3)TUNE FREQ TO

3)POWER SUPPLY HIGH END.

2 522/520KHz 1)AM SWEEP GEN PLACE THE AM TAKE OUT THE ADJUS T101 VT 1)BAND SW IN AM

WITH ANTENNA ANT COIL CLOSE SIGNAL FROM VOLTAGE TO 1.6V POSITION.

2)ALIGNMENT TO THE GEN. PIN19 OF IC101 2)VOL CONTROL
OSCILLOSCOPE ANTENNA. IN MIN POSITION.

3)POWER SUPPLY 3)TUNE FREQ TO
LOW END.

3 1400KHz SAME AS STEP 1. SAME AS STEP 1. SAME AS STEP 1. ADJUST TC102 TO TUNE FREQ TO

GET MAX OUTPUT 1404/1400KHz
AT 1404/1400KHz

4 600KHz SAME AS STEP 1. SAMP AS STEP 1. SAME AS STEP 1. ADJUST MW COIL TO TUNE FREQ TO

GET MAX OUTPUT 603/600KHz.
AT603/600KHz.

5 REPEAT STEP 3,4 AND THEN 2,3,4, UNTIL NO FURTHER IMPROVEMENT CAN BE MADE.