Fostex E-2 - Record Alignment and Frequency Response

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transport in record mode, and after temporarily rotating the BIAS 1
trimmer (C101, 150PF) fully CCW, slowly rotate it CW while watching the
AC voltmeter, Fix the pot when the reading passes the peak and reaches
498 below peak level.
After completing bias level adjustments, check the overall frequency
response for 15 ips and 7-1/2 ips speeds.
CHECKING RECORD ALIGNMENT
1) After performing the reproduce check, thread a blank recording tape on
the transport (Ampex 456 is recommended) and set speed selector to HIGH
(15 ips).
2) Depress all RECORD TRACK selectors (READY mode), depress all INPUT
buttons (INPUT mode), set METER selector to CAL and all INPUT level
controls also to the CAL position.
3) Apply a KHz signal to the recorder XLR connector inputs at nominal
*4dBm level. All meters should indicate ОУП, If not, adjust to OVU by
the INPUT control knob on the trim panel.
4) Depress both REPRO buttons of the INPUT/SYNC/REPRO selectors, put trans-
port in the record mode and adjust the REC LEVEL pot (R206, 5КЯВ) in the
Record Amplifier PCB Assembly for a OVU meter reading.
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OVERALL FREQUENCY RESPONSE CHECK
1) Apply the input signal to INPUT L XLR connector and connect an AC volt-
meter to OUTPUT L (RCA phone jack). Then, put channel L in the record
mode, and set the INPUT/SYNC/REPRO selector to REPRO,
Switch tape SPEED selector to HIGH, apply a -6dBm signal of 30Hz
through 26KHz to the INPUT connector, put transport in record mode, and
check the overall frequency response.
Normal reponse, with reference to 1KHz, the response is within t3dB
throughout the range of 30Hz through 26KHz (50Hz А 20KHz t3dB, for CUE