Equalization Adj control R30 for a reading of 1.0V on distortion
(10) Observe the distortion analyzer while playing remainder
All test tones, with the exception of the last tone
of the test tones.
(500 Hz) at operating level should be within 4 db of the reference
The last tone (500 Hz at operating level) should
level tone (l.0V).
be 3.2 volts
(11) The procedure for the 7.5 Equalization Adj control
adjustment is the same as for the 3.75 above except that the 7.5 ips
test tape is used, the reference level tone is 700 Hz, and Equali-
zation Adj control R31 is adjusted at the 7500 Hz test tone.
step 7, the azimuth adjustment is not repeated.
test equipment and replace the protective cover (removed in step (1)
on the play-record head.
BIAS TRAP ADJUSTMENT.
(1) Connect ac voltmeter positive lead to positive side
of capacitor C11 (collector of record driver Q4) and common lead to
E20 on printed circuit board.
POWER ON switch.
Depress RECORD and PLAY switches simultaneously.
Set ac voltmeter to a scale which will provide a reading.
Adjust Bias Trap coil L1 for a minimum reading on ac
Disconnect ac voltmeter.