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Release the BIAS button.
I
ress the RE RO button.
I
I
BIAS
I
4
I
I
I
I
TW27A-3
TW27A-4
I
ress the BIAS button.
Figure 4-3
Bias Card Adjustments
ress the READY button.
I
Page 4-3
7. Check the Bi s level for
0 VU re ding on the
ch nnel meter for e ch ch nnel.
6. Check the repro c rd high frequency equ liz
tion for a 0 VU level on the ch nnel meter for e ch
ch nnel.
ress the RE RO button.
5. Check the cue level for 0 VU on the ch nnel
meter for e ch ch nnel.
ress the CUE button.
4. Check the c libr ted repro level for 0 VU on the
ch nnel meter for e ch ch nnel.
ress RE RO and SAFE buttons.
lay the 10 kHz tone on the alignment tape.
Channel VU meter should read 0 VU.
Connect the signal generator to the channel
line input. Adjust output for 10 kHz at +4 dBm.
If necessary, adjust the LO< , MED< , or HI <
potentiometer, depending
on the selected
speed, for a 0 VU meter reading.
Rewind the alignment tape and load a reel of
bulk erased tape. Use the same type of tape
which will be used for recording.
lace the RE RO CAL and REC CAL switches
in the CAL positions.
If necessary, adjust the CUE LVL potentiometer
on the repro card for
0 VU meter reading.
lay the 1 kHz level set tone on the alignment
tape. Channel VU meter should read 0 VU.
(On the broadcast deck, adjust the LO LVL or HI
LVL potentiometer, depending on the selected
tape speed.)
If necessary, adjust the CAL RE potentiometer
on the repro card for a 0 VU meter reading.
ress CUE button. Check the record head
azimuth as above and adjust if necessary.
lay the 1 kHz level set tone on the alignment
tape. Channel VU meter should read 0 VU.
Turn the LO, MED, or HI BIAS potentiometer,
depending on the tape speed selected, several
turns counter-clockwise.
Turn the LO, MED, or HI BIAS potentiometer un
til the VU meter peaks and begins to fall off
again.
Record the 10 kHz tone on the tape at the speed
which will be used for recording. Channel VU
meter should read 0 VU.
If the VU meter does not read 0 VU, perform the
following adjustment.
For 71/2 ips or 15 ips, adjust the LO, MED, or HI
Bias potentiometer clockwise to drop the meter
BIAS
BDCST
L °@
BIAS
CAL, — .
BIAS
CAL —
@
MED-.
L0 @
hi
— .
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