FOR LUCKY ONES WHO RECEIVED PCB'S ALLREADY....
33609 COOKING RECEIPT
WATCH ADDAMS FAMILY 3-4 TIMES FOR GOOD STATE OF MIND,
OR PUT YOUR FAVORITE LP.
AT FIRST, CHECK ALL RESISTORS, TRANSISTORS, ETC FOR RIGHT VALUES/POLARITY.
CHECK ALL WIRES ACCORDING TO SCHEMATIC AND PICTURES.
IF USING TRAFOS IN METAL CANS, BE SURE NO SHORTS, THERE'S TWO BLANK
SMALL PCB'S WITH HOLES TO PUT THEM BENEATH THE TRUNNY'S ON MOTHERBOARD.
CHECK TWICE TRUNNY'S ARE NOT REVERSED, ETC.
BE SURE NO CONTANINATION ON PCB.
THEN, CONNECT POWER TRAFO TO POWER SUPPLY AND CHECK OUTPUT VOLTAGE IS 24V+/-3%.
33609 FIRST FIRE-UP
CONNECT POWER SUPPLY TO MOTHER PCB, CONNECT BYPASS PCB, METER, FRONT PANNEL PCB'S.
PUT 5K POTENTIOMETER ON BA340 TO CCW (LEFT) POSITION.
MEASURE VOLTAGE ON R44, 10R0, AND ADJUST TRIMPOT ON BA340 TO GET 250-280 MV READING,
LEAVE THE UNIT FOR 5 MIN AND RE-ADJ. IF NEEDED.
MOST OF PEOPLE THERE HAVE A MEASUREMENT SETUP OF SOUNDCARD, SCOPE AND MULTIMETER.
HERE'S ADAPTED MINIMIZED TEST PROC.
NUMBERE ARE ACCORDING TO ORIG.TEST PROC.
3.2.ADJUST YOUR SOUNDCARD FOR 0.775 V AC OUTPUT, IT IS 0DBU @600 OHM
GO TO 3.3, 3.4, 3.5, 3.6
SECTION 4.
4.0. ON POWER SUPPLY BOARD, ADJUST R6 (POT NEAR OP-AMP) FOR 3,00V ON +CV PAD TO GND (-CV PAD)
YOU HAVE 3.00 V SOURCE FOR CALIBRATING DIODE BRIDGE VCA.
4.1. APPLY 0DB TO INPUT. COM OFF, LIM OFF, BYPASS IN, MEASURE OUTPUT IS 0 DB,
CONNECT LINK TO CV 3.00V WITH CROCODILE CABLE. ADJUST RV2 TO GET -8 DB AT OUTPUT.
LET UNIT HEAT-UP 5 MIN, REPEAT.
4.2. APPLY 0DB TO INPUT. COM OFF, LIM OFF, BYPASS IN, MEASURE OUTPUT IS 0 DB,
CONNECT LINK TO CV WITH CROCODILE CABLE. ON POWER SUPPLY BOARD, ADJUST R6
(POT NEAR OP-AMP) FOR -20DB AT OUTPUT.
ADJUST METER POR RV3 FOR -20 DB READING ON METER.
GOTO 4.0, WATCH -8 DB ON METER AT 4.1, MEASURE -8 DB OUTPUT, RE-ADJUST IF NEEDED,
REPEAT IF NEEDED, GOTO 4.2, EXIT LOOP.
VCA DEPENDS ON ROOM TEMPERATURE, AND ADJUST BOTH BOARDS AGAIN WHEN UNIT IS FINNISHED
TO GET PRECISION COMPRESSOR.
4.3. APPLY MAX. OUTPUT FROM SOUNDCARD TO INPUT, AT LEAST +10DBU,
LIM IN, ATT FAST, RECOVERY 50, LIM THRESHOLD TO +4, COMP OFF,
ADJUST RV4 TO +4 AT OUTPUT.
FOR 4.4-4.7, CHANGE LIM RECOVERY, PUT LIM IN-OUT, SEE RECOVERY ON SCOPE.
IF UNIT DONE WITHOUT ERRORS, ALL SHOULD BE FINE.
GOTO 5.1.
5.2, LIM OFF, INPUT 0DBU, COM THRESHOLD 0DB, MAKEUP 0, RECOVERY 100, RATIO 6, COM SW OFF.
MEASURE OUT IS 0DB.
PUT COM SW IN, MEASURE OUT IS 0DB, PUT COM THRESHOLD TO -2, MEASURE OUT IS -1DB,
ADJUST RV5 IF NOT.
INPUT ODB, THRESHOLD -20DB, MAKEUP 0, RECOVERY 100, RATIO 6, COM SW OFF.
MEASURE OUT IS 0DB.
PUT COM SW IN, MEASURE OUT IS AROUND -16DB.
ADJUST RV5 IF NOT.
GOTO 5.2 AND CHECK 0DB THRESHOLD AGAIN, ADJUST BOTH L AND R CHANNELS FOR SAME COMPRESSION.
CHECK RECOVERY SAME AS IN LIMITER SECTION.
GOOD LUCK!
