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9.8 APPROXIMATE ADJUSTMENT OF
R E C O R D I N G B I A S
1. Set the BIAS control to the center click-stop
position, and the TAPE switch to the METAL
position.
Then proceed with the CT-F950 in
recording mode.
2. Connect an millivoltmeter across the mother
ass'y TP terminal No.40 (left) and ground, and
another meter across TP terminal No.43 (right)
and ground.
3. Adjust VRros (left) and VRsoe (right) so that
the meters read 12mV.
4. Next change the TAPE switch to STD, and
adjust VRror to
obtain
meter readings of
6mV. Change the switch again to the CrOz
position, and adjust VRroz to obtain meter
readings of 9.5mV.
5. Then set the MONITOR switch to the SOURCE
position, and apply a 333H2, -10dBv (316mV)
signal to the INPUT terminals.
6. Connect the millivoltmeters to the OUTPUT
terminals, and adjust the INPUT level controls
so that the meters read - 10dBv (316mV).
7. After completing the above adjustments, set the
MONITOR switch to the TAPE position, and
record and play back the 333H2, -10dBv
(316mV) signal onto/from the STD-601 test
tape. Then after first turning VRaos (left) and
VRsoe (right) counterclockwise, turn them back
clockwise and stop at the maximum position.
O U T P U T
L E V E L
I r a s
Fig. 9-5
OutPut level
9 . 9 R E C O R D I N G E O U A L I Z E R A N D
VARIABLE EOUALIZER ADJUSTMENTS
1. Connect millivoltmeters to the mother ass'y TP
terminals No.30 (left) and No.29 (right).
2. Short circuit the base of Qror (mother ass'y) to
ground (circuit board Pattern).
3. Set the MONITOR switch to SOURCE, and
apply a 333H2, -10dBv (3LGmV) signal to the
INPUT terminals. Then proceed in recording
mode.
4. Adjust the INPUT level controls to obtain meter
readings of -BdBv (700mV).
5. Next connect an millivoltmeter to TP terminal
No.5 in the IC amplifier ass'y, and adjust VRzor
and VRzoe to obtain the same output levels
for the 333H2 and 10kHz input signals. (Vari-
able equalizer adjustment).
6. Then set the TAPE switch to the STD position,
and connect millivoltmeters across the mother
ass'y TP terminal No.40 (left) and ground, and
TP terminal No.43 (right) and ground. Switch
the input to 15kHz and obtain the same AC
millivoltmeter
readings by employing an at-
tenuator in the input stage. Adjust Lcor (left)
and Lqoz (right) so that the amount of attenua-
tion required is 13.0d8. (STD recording equal-
izer adjustment).
7. Change the TAPE switch setting to METAL, and
adjust in the same way as described above in
step 6. In this case, adjust Leos and Lcoe so
that the attenuation required will be 16.0d8.
(METAL recording equalizer adjustment).
8. Finally set the TAPE switch to the CrOz and
Fe-Cr positions, the required amount of attenua-
tion being 19.6 f 1.5dB and 12.6 I 1.5 dB re-
spectively.
9.10 RECORDING AND PLAYBACK
FREOUENCY RESPONSE ADJUSTMENT
1. Connect millivoltmeters to the OUTPUT termi-
nals.
2. Set the TAPE switch to STD, and the MONI-
TOR switch to SOURCE, and apply a 333H2,
-30dBv (31.6mV) signal to the INPUT termi-
nals. Adjust the INPUT level controls so as to
obtain meter readings of
-27d8
(44.6mV).
3. Set the Monitor switch to TAPE, record 333H2,
-30dBv (31.6mV) and 10kHz, -30dBv signals
onto the STD-601 test tape. Play these sections
back again, and adjust VRooc (left) and VRros
(right) so that the output difference between
these two signals is about OdB at 10kHz.
4. Then, confirm that the record/playback fre-
quency response of test tape STE-601 is within
the fixed standard range (page 4O).
5. Set the tape selector switch to METAL, ild
use the STD-604 test tape as in the previous
instructions.
Record the 333H2 and 10kHz
signals and play them back.
Then, confirm
that
the playback output
deviation of the
10kHz signal is within +1 t 1dB of the 333H2
signal'
M a x i m u m o u t P U t
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