Mechanical Adjustments - Sanyo MR-1020 Service Manual

Unscrew eight screws
(G...N) to remove the
Control Panel.
MECHANICAL ADJUSTMENTS
I, Operation button pressure
y) Fig. 3
Operation
button
To gauge how much power is required to change functions by press-
ing an operation button, press the button straight down, at a point
5mm from its edge. Press it with a spring scale (4 or 5 kg), and read
the number at the time the operation button locks (see the figure
below).
The standard pressures for changing operations are shown in the
following table.
PLAY —> STOP less than 2k gr.
STOP —> TAKE UP > p> less than 3k gr.
STOP —> TAKE UP qq less than 3k gr.
STOP — PLAY less than 3k gr.
Press each DIRECTION button with the spring scale. Read the
scale at the moment the lamp lights; the force required should be
less than 500 gr.
ADJUSTMENT
If abnormal force is required to push an operation button, it can
usually be brought within the above range by oiling the connected
slide lever. In this case grease the contacting surfaces of the opera-
tion button lock slide (G1,2 and 3) and the slide supporting metal
(G4 and G5).
II. Reel base tension
The tension of each reel base should be measured as shown in the
figure below; this tension should be within the following range:
MEASUREMENT CONDITIONS
* Tape speed should be 7-1/2 ips.
* Use an empty 3 inch reel; on the hub wind one end of a piece of
thread, and then attach a tension gauge.
thread, and then attach a tension gauge.
1, PLAY tension
* Set the reel (with thread and tension gauge) on the right
spindle, as shown in figure 4.
Turn on the power switch and hold the lever to keep the auto
stop from operating. Hold the tension gauge parallel with the
plane of the reel and pull it in the rewind direction at a speed
of about 5 cm/sec.
* Normal tension is between 50 and 120 gr.
* If the reading is not within this range, adjust as follows:
Change the reel base and slip pully felt.
Change the slip mechanism coil spring (N3) or plate
spring (N7).
—2
Right reet base
Tension gauge
2. PLAY and FWD back tension
* Normal tension is between 40 and 60 gr.
Left reel base
Tension gauge
3. Tension of the motor slip pulley
(See exploded view.)
* Suitable tension is between 40 and 60 gr.
Slipping plate (17)
Tension gauge
Micro switch
$24
Fig. 6