Service manual

26
26-1
26-2
20F630
CU20F630
ADJUSTMENT ITEM ADJUSTMENT POSITION CONTROL PRE-ADJUST REQUIREMENT CONTENT INPUT CONDITION OUTPUT
ADJUSTMENT PROCEDURE
1) CONNECT 100 µ F ELECTROLLYTIC CAPACITOR BETWEEN C3005
(-ve)-GND
2) ADJUST THE BUS DATA M02 UNTIL THE OUTPUT FREQUENCY OF
39 PIN BECOME AS SPECIFIED BELOW.
NOTE: TO MINIMIZE THE PRODUCTION TIME, ITEM 1) CAN IGNORE.
IF ITEM 2) CAN'T BE ADJUST, THEN ITEM 1) IS REQUIRE.
MTS+VCO ADJUSTMENT
M02 STEP RANGE 0~63
I
2
C BUS CONTROL
OPTION SET UP, BUS SET UP, VCO ADJ, RF-AGC SIGNAL WITHOUT NOISE (SIGNAL WITHOUT SOUND MODULATION) AC 120V
IC 3001 39 PIN
[CHECKING SPEC] 62.94 ± 0.75kHz (CHECKING SPEC : 62.94 ± 1.20kHz)
ADJUSTMENT ITEM ADJUSTMENT POSITION CONTROL PRE-ADJUST REQUIREMENT CONTENT INPUT CONDITION OUTPUT
ADJUSTMENT PROCEDURE
1) ADJUST M03 DATA UNITILL OK DISPLAY ON SCREEN ADJUST THE
BUS DATA IN CENTRE OF THE RANGE.
FILTER ADJUSTMENT
M03 STEP RANGE 0~63
I
2
C BUS CONTROL
OPTION SET UP, BUS SET UP, VCO ADJ, RF-AGC, MS-LEVEL, MTS-VCO SINE WAVE (9.4kHz, 600mVrms) PIN 14 (FROM C3005 - TERMINAL)
CONFIRM BY CRT SCREEN
[CHECKING SPEC] REFER TO ABOVE (CHECKING SPEC : ± 2 STEP TO CENTRE)