Panasonic RQ-218S-E - Page 3

ADJUSTMENTS
MEASUREMENTS AND ADJUSTMENTS METHOD
A. PRESSURE ROLLER ADJUSTMENT (See fig. 4)
1. Set into playback mode.
2. Connect the spring gauge to pressure roller lever
and pull it in the direction of the arrow as shown in
fig. 4.
3. Measure the tension at the monent when the pressure
roller moves away from the capstan.
Standard pressure: 230+30 gr
4. |f the pressure is out of tolerance, bend the part (a)
of the pressure roller spring in either direction shown
by the arrow until the correct pressure is attained.
Pressure Roller
B. HEAD AZIMUTH ADJUSTMENT (See fig. 5)
1. Play the test tape C-AA.
2. Adjust the screw for maximum output at monitor
jack.
.
Azimuth Adjustment Screw
C. TAPE SPEED ADJUSTMENT (See fig. 6)
1. Play the test tape C-WAT and supply output signal
to frequency counter.
2. Read the value on frequency counter.
Standard value: 3000 Hz+3%
3. If the value is out of tolerance, adjust semi-fixed
variable resistor (Shown in electrical parts location)
on motor governor circuit board and take aim at
3000Hz+1% in order to secure accuracy.
Monitor Jack
D
1
2
3
E
1
2
nm
. RECORDING BIAS CURRENT ADJUSTMENT (See fig. 7)
. Connect 10Q resistor as shown in fig. 7.
. Connect VTVM to both ends of 10Q resistor.
. Set into record mode and read voltage on VTVM.
Standard voltage: 8+1 mV
. If the voltage is out of tolerance, change the short
point A, B, C, of bias oscillation circuit.
To increase, short s% A.
To declease, short s% C.
. LEVEL METER ADJUSTMENT (See fig. 8)
. Supply DC 4.2 V to DC IN jack.
. Set into playback mode and. confirm the indicator
position on level meter is as shown below.
DC4.5V UNIT
Indicator position:
. If the indicator get out of place, adjust VR2 until the
level meter indicates above position.
. OTHER SPECIFICATIONS FOR REFERENCE (NO ADJUSTABLE)
ITEM VALUE REMARKS
Wow & flutter (RMS) less than 0.4% Use 3 kHz test tape (C-WAT).
Takeup torque. 55+15 er Use cassette torque metter (RP-8063).
To obtain 70#A of recording current through the
recording head. Stop the bias oscillation by
unsoldering R30 shown in printed circuit board
view on page 4.
Standard recording input level. 1kHz —72+5 dB
Bias oscillation frequency. 44+5 kHz
DC 7.9+0.7 mA
Erase current.