Adjustment Procedures - Sanyo M1112 Service Manual

ADJUSTMENT PROCEDURES
GENERAL REMARKS
e Before the adjustments, wipe off stains on the tape
contacting surfaces of the parts and the belt with a soft cloth
soaked in alcohol. Trouble may occur because of oil and
grease stains. Carefully handle the belt because grease
easily attaches to it.
REQUIRED EQUIPMENT
@ VTVM
Frequency Counter
DC Constant-voltage Regulator
Dummy Load (4:2)
Test Tape
+ 3kHz Test Tape (Example: TEAC MTT-111) for Tape
Speed Adjustment
+ 8kHz Test Tape (Example: TEAC MTT-113C) for Head
Azimuth Adjustment
e Alignment Tool
NOTE:
Before performing the adjustment, set the control and
switch as follows:
# Volume Control ............. ccc cece cece eecceevceeee As desired
+ Speed Control .............cc
ccc eeecee seuss click position (0)
# Supply 3.0V DC from the voltage regulator to the Ext.
Power Jack.
The service part of the ASO Lever is not cut to avoid deforming
as illustrated.
When replacing the ASO Lever, cut the part indicated in the
iltustration.
TAPE SPEED ADJUSTMENT
1. Open the Battery Compartment Lid and connect the
frequency counter to the earphone jack as illustrated.
Then insert the 3kHz test tape into the cassette
compartment.
2. While playing back the test tape, adjust the tape speed by
turning the potentiometer P501 on the P.C.Board as
illustrated until the frequency counter reads 3,000Hz [+3%].
Frequency Counter
3,000Hz [+3%]
ryjo eood @ can
HEAD AZIMUTH ADJUSTMENT
1. Connect the VTVM to the earphone jack as illustrated and
insert the 8kHz test tape into the cassette compartment.
_ Dummy Load (40)
Adjustment
Record/Play Head
2. While playing back the test tape, turn the azimuth adjusting
screw until the VITVM reads the maximum.
3. After the adjustment, secure the adjusting screw with paint
or glue.
Pe E eee TCT mee ees: CT