Sanyo M7770K - Adjustments; AMSS Solenoid Adjustment

ADJUSTMENTS
GENERAL REMARKS
@ Before adjustment, wipe the tape contacting surfaces clean
as well as the contacting surfaces of the driving parts 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.
@ Check the rubber-used parts. If the rubber has quality
deterioration or scratch marks, replace the part with a new
one,
Unless especially specified, set the unit and measuring
instruments as follows:
@ Tape Select Switch............ 0202 eae NORMAL
@ Function SWItth « 664.454.0404 555.456.549.484 4 TAPE
@: Mode: SWitthwes se eS oe ee lw ee Ree STEREO
@ Beat Cancel Switch ......... 0.0 eee ee ee ee 3
@ Balance Control.............. Center (click position)
©. “Tone CoOntrGl: «405-3 4.2.2.6 hw ee ee we a High
©: Nolime Control’ <s-004 Ss yee ke ee Ne eee ows Arbitrary
@® DC Constant-Voltage Regulator Output ....... 9.0V DC
NOTE:
1. Perform each adjustment in the described order.
2. Obtain the output from the line output terminal.
3. Supply 9.0V DC from the constant-voltage regulator to
the unit.
EQUIPMENT REQUIRED
@ VTVM (2 sets)
Frequency Counter
Dummy Load (47 k-ohm)
Dualtrace Synchroscope
Test Tapes
* 3kHz Test Tape (Example: TEAC MTT-111) for Tape
Speed Adjustment
* 8kHz Test Tape (Example: TEAC MTT-113C) for Head
Azimuth Adjustment
@ DC Constant-Voltage Regulator
@ Alignment Tool
AMSS SOLENOID ADJUSTMENT
AMSS (Automatic Music Select System) detects a silent space
(unrecorded portion) between each music on a music tape and
automatically plays back a desired music from the start.
NOTE:
Unrecorded portion should last more than approximately four
seconds.
It may not operate correctly in the following cases:
* When the recorded sound is often interrupted as in a speech
tape.
When the silent space does not last long enough (less than
four seconds).
When there is an appreciable noise in the silent space
between two adjacent programs.
When the unit is placed on a television set, AMSS may not
Operate correctly due to adverse effect of the TV signal. In
this case, put the unit away from the television set.
*
If
AMSS
Solenoid
is
not
correctly
positioned,
AMSS
mechanism
does not function correctly, F.FWD or Rewind button is released
while
Automatic
Music
Select
System
is
working,
or
a
button
may not be locked. In this case, perform the adjustment as
follows:
1.
Remove
the
Chassis
from
the
unit
by
following
its
removal
instructions.
2. Loosen the two screws fastening the Spacer of the Solenoid.
Then, adjust the Spacer by moving it in the direction of the
arrow, so that the Lock Plate is tightly attached to the two
absorption surfaces as illustrated.
Spacer
Screw
(ime wae seme
ee) ae
No Clearance
3. After the adjustment, tighten the screws fastening the
Spacer. Set the unit in the playback mode and check that
AMSS mechanism functions correctly as follows:
* Check if F.FWD button can be locked by pressing it.
* Check if Rewind button can be locked by pressing it.
4. Readjust the spacer position if either F.FWD or Rewind
button cannot be locked or is soon released.
5. After the confirmation, secure the screws fastening the
Spacer with paint or glue. —