Philips MME140//78, Service Manual

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AM I.F. ALIGNMENT
1. Set the FUNCTION SWITCH to RADIO
2. Set the BAND SELECTOR switch to AM .
3. Connect a SWEEPSCOPE OUTPUT to AM ant Terminal.
4. Connect a SWEEPSCOPE INPUT to pin18 of IC4 TA2111N through a 1uF capacitor and ground.
STEP SET SIGNAL
SET DIAL
ADJUST ADJUST FOR
1 455KHz GANG OPEN IF1 (AM IF) CENTRE
& MAXIMUM OUTPUT
AM R.F. ALIGNMENT
1. Connect an RF generator to a standard radiating loop.
2. Connect a SCOPE VTVM across the speaker output.
STEP SET SIGNAL
SET DIAL
ADJUST ADJUST FOR
1 520KHz GANG CLOSED IF3 (AM OSC COIL)
2 1720KHz GANG OPEN PV1-D (AM OSC TRIM.) MAXIMUM
3 600KHz 600KHz L6 (AM ANT COIL) OUTPUT
4 1400KHz 1400KHz PV1-C (AM ANT TRIM.)
5 REPEAT STEPS 3 AND 4 TO OBTAIN BEST TRACKING.
FM I.F. ALIGNMENT
1. Set the FUNCTION SWITCH to RADIO
2. Set the BAND SELECTOR to FM position.
3. Connect a SWEEPSCOPE OUTPUT to pin 21 of IC4 TA2111N through a 20pF capacitor and ground.
4. Connect a SWEEPSCOPE INPUT to pin18 of IC4 TA2111N through a 1uF capacitor and ground.
STEP SET SIGNAL
SET DIAL
ADJUST ADJUST FOR
BALANCED CURVE
1
10.7MHz GANG OPEN
Check 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 87MHz GANG CLOSED L3 (FM OSC COIL)
2 108.5.MHz GANG OPEN PV1-A (FM OSC TRIM.) MAXIMUM
3 90MHz 90MHz L4 (FM RF COIL) OUTPUT
4 106MHz 106MHz PV1-B (FM RF TRIM.)
5 REPEAT STEPS 3 AND 4 TO OBTAIN MAXIMUM OUTPUT.
CASSETTE ALIGNMENT
1. Set the FUNCTION SELECTOR switch to TAPE.
2. Connect a Scope & VTVM across the speaker output.
3. Insert the 8KHz tape in to cassette deck
and push play buttom.
4. Adjusting HEAD for speaker maximum output.
ALIGNMENT INSTRUCTION