– 17 –
Tape Speed Adjustment
Procedure :
– FWD Playback Mode –
1. Set to FWD playback mode.
2. Adjust RV160 so that the frequency counter reading becomes
3,000Hz.
Standard value : 2,970 to 3,030Hz
3. Set to REV playback mode.
Confirm the frequency should be within the standard value.
4. Confirm the frequency difference between beginning and the
end of tape should be within 1.5% (45Hz).
Adjustment Location : TC RF board
set
test tape
WS-48B
(3kHz, 0dB)
frequency counter
LINE OUT (JK301)
47K
Ω
TUNER SECTION
AM Section
BAND button : AM
Volume : MIN
FM Section
BAND button : FM
Volume : MIN
•
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
450kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
reading on digital
voltmeter.
L5
530kHz
Adjustment value :1.4V
Standard value : 1.2 – 1.6V
Confirmation
1,710kHz
Standard value : 7.7 – 8.3V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
620kHz
Confirmation
1,400kHz
set
AM RF signal
generator
loop antenna A
loop antenna B
60cm
30% amplitude modulation by 400Hz
signal
Output level : as low as possible
FM RF signal
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
FM EXT.
ANT.
terminal
0.01
µ
F
set
47K
Ω
+
–
LINE OUT (JK301)
level meter
0dB=1
µ
V
TC RF board
RV160 : Tape speed adjustment
Cabinet, front (Rear side)
