Electrical Adjustments; Equipment Required; Tape Speed Adjustment - Sanyo M4440 Service Manual

ELECTRICAL ADJUSTMENTS
EQUIPMENT REQUIRED
@ VTVM
@ Frequency Counter
@ Dummy Load (34 ohm)
@ Test Tapes
* 3kHz Test Tape for the Tape Speed Adjustment
* 10kHz Test Tape for the Head Azimuth Adjustment
@ Alignment Too!
NOTE:
Before the Electrical Adjustments, set the unit as follows:
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* Balance Control..............- O (Center Position)
* Pitch Control ............0.- 0 (Detent Position)
* Supply a regulated DC 6V power to the DC 6V Jack (J2).
TAPE SPEED ADJUSTMENT
1. Remove the Battery Compartment
Batteries from the compartment.
Lid and take out
2. Connect a frequency counter to the Headphone Jack (J1) as
illustrated and insert a 3kHz test tape into the cassette
compartment.
34 ohm =
Dummy Load 7
Frequency Counter
3 kHz (43%)
l HEAD
@ pyones
3. While playing back the test tape, adjust the tape speed by
turning the potentiometer (P301) on the P.C.Board with an
alignment too! until the frequency counter reads 3kHz.
Adjustment
R/P HEAD AZIMUTH ADJUSTMENT
1. Remove the cassette compartment lid by following the
instructions for it.
2. Connect a VIVM to the Headphones Jack as illustrated and
play back a 10kHz test tape.
34 ohm
Dummy Load yi,
VTVM (Max.}
@ pee
PHONES
Adjustment
Play Back Head
Adjusting Screw
NO.1 position
LEFT Channel
NO.3 position Adjustment
NO.2 position
RIGHT Channel
3. Turn the azimuth adjusting screw until the Left channel on
the VTVM becomes maximum. (No. 1 position)
4, Reconnect the VTVM to the Right channel.
5, Then, turn the azimuth adjusting screw again until the Right
channe! output on the VTVM becomes maximum. (No. 2
position)
6. Turn the adjusting screw to the center of the No.1 and No. 2
positions as illustrated. (No. 3 position)
7. Repeat the above described adjustment several times.
8. After the adjustment, secure the adjusting screw with paint
or glue.