TM 11-5835-241-13&P
e. ERASE BIAS ADJUSTMENT.
(1) Disconnect plug P2 from record-play-erase head PU1.
(2) Connect the ac voltmeter positive lead to E23 and the
common lead to E22 on the printed circuit board.
(3) Adjust Erase Bias Adj control R50 for a reading of
45 volts as indicated on the ac voltmeter.
(4) Disconnect ac voltmeter.
f.
RECORD LEVEL CALIBRATION AND RECORD BIAS ADJUSTMENT.
(1) Disconnect plug P2 from record-play-erase head PU1.
(2) Connect signal generator to BRIDGE INPUT connector.
level of 1 volt.
(4) Depress the POWER ON switch.
(5) Depress the RECORD switch only (do not depress the
PLAY switch).
(6) Adjust the RECORD LEVEL control for a VU meter reading
of +3.
(7) Adjust Record Calibrate control R10 for an ac
voltmeter reading of 1.25 volts.
(8) Depress the RECORD and PLAY switches simultaneously.
(9) Adjust Record Bias Adj control R51 for a reading of
24 volts as indicated on the ac voltmeter connected to erase head
terminals of P2.
(10) Disconnect test equipment and reconnect plug P2
to the record-play-erase head.
5-6
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