4
MC-DX33
3 ADJUSTMENTS AND CHECKS
ALIGNMENT PROCEDURES
AM I.F. ALIGNMENT
1. Set the POWER BUTTON to POWER "ON".
2. Set the Radio and band button to Radio and AM BAND.
3. Connect a SWEEPSCOPE OUTPUT to AM antenna terminal.
4. Connect a SWEEPSCOPE INPUT to pin17 of IC2 through a 1uf capacitor and ground.
STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR
1 450KHz GANG OPEN T203(AM IF)
CENTER
&MAXIMUM OUTPUT
AM R.F. ALIGNMENT
1. Connect an RF generator to a standard radiating loop.
2. Connect a SCOPE and VTVM across the speaker output.
STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR
1 522KHz GANG CLOSED T206 (AM OSC COIL)
MAXIMUM
OUTPUT
2 600KHz 600KHz T204 (AM SENS COIL)
3 1400KHz 1400KHz SVC202 (AM SENS TRIM.)
4 REPEAT STEPS 3 AND 4 TO OBTAIN BEST TRACKING.
FM I.F. ALIGNMENT
1. Set the POWER BUTTON to POWER "ON".
2. Set the TUNER/BAND Switch to FM position.
3. Connect a SWEEPSCOPE OUTPUT to pin 7 of IC1 through a 20pF capacitor and ground.
4. Connect a SWEEPSCOPE INPUT to pin18 of IC2 through a 1uf capacitor and ground.
STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR
1 10.7MHz GAND OPEN IFT
WITH 10.7MHz AT
ZERO CROSSOVER
FM R.F. ALIGNMENT
1. Connect an RF generator to the FM antenna terminal and ground.
2. Connect a SCOPE & VTVM across the speaker output.
STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR
1 87.5MHz GANG CLOSED L2
MAXIMUM
OUTPUT
2 90MHz 90MHz L5
3 106MHz 106MHz L3
To Next Page
Loading...
