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
Summary of Contents for MC-DX33
Page 5: ... MC DX33 CD ALIGNMENT Auto alignment ...
Page 6: ...MC DX33 6 4 EXPLODED VIEWS AND PARTS LIST ...
Page 10: ...10 MC DX33 MAIN PCB ...
Page 12: ...12 MC DX33 CD PCB ...
Page 14: ...14 MC DX33 SWITCH PCB POWER PCB ...
Page 16: ...16 MC DX33 TUNER PCB ...
Page 18: ...18 MC DX33 DISPLAY PCB ...
Page 20: ...20 MC DX33 RCA JACK PCB LED PCB AUX PCB VOL PCB ...
Page 22: ...22 MC DX33 STANDBY PCB SENSOR PCB REMOTE CONTROL PCB ...
Page 25: ...25 MC DX33 MAIN PCB MAIN PCB CN206 CN208 MAIN PCB CN202 CN512 DISPLAY PCB TUNER PCB ...
Page 29: ...See Standby curcuit MC DX33 Micro Hi Fi system Power SUB PCB ...
Page 30: ...Power SUB PCB MC DX33 Micro Hi Fi system ...
Page 31: ...MAIN PCB MC DX33 Micro Hi Fi system ...
Page 32: ...TUNER PCB MC DX33 Micro Hi Fi system ...
Page 33: ...STANDBY PCB MC DX33 Micro Hi Fi system ...
Page 34: ...MCU SCHEMATIC MC DX33 Micro Hi Fi system ...