Teac A-4070G - Page 26

RECORD LEVEL SET
OVERALL
The OUTPUT controls must be at the specified output
level position (-8 dB at output jack).
HIGH position.
1. Apply a 400 Hz signal at -8 dB to the LINE IN jack.
2. Thread a record test tape SCOTCH 203 on the unit. Set the RECORD
MODE, EQ and BIAS switches to HIGH position.
3. Place the unit in the stereo record mode with the MONITOR switch
in the TAPE position, LINE controls fully clockwise.
4, Adjust FORWARD VR-103, VR-203, REVERSE VR-104, VR-204 for -8 dB
signal at OUTPUT jacks.
NORMAL position
Nn
. Apply a 400 Hz signal at -8 dB to the LINE IN jack.
6. Thread a record test tape SCOTCH 150 on the unit. Set the RECORD
MODE, EQ and BIAS switches to NORMAL position.
7. Adjust VR-108, VR-208 as in HIGH position. Do not adjust in re-
verse mode forward only.
FREQUENCY RESPONSE
HIGH position
1. Thread a blank SCOTCH 203 tape on unit, place RECORD MODE, EQ and
BIAS switches at HIGH, tape SPEED at 7-1/2 19cm o position.
2. Apply a signal swept from 20Hzv20kHz at -33 dB to LINE IN jack and
record it on the test tape.
3. Adjust L-103, L-203 for best response.
4. Repeat above procedures for 3-3/4ips using a signal swept from 50
Hzv7.5kHz.
NORMAL position
5. Thread a blank SCOTCH 150 tape on the unit, place RECORD MODE, EQ
and BIAS switches at NORMAL, tape SPEED at 3-3/4 9.5cm [1 positim.
6. Repeat overall response check at both speeds and both directions.
NOTE
If further adjustment is required, C-148, C-149 must be
changed, if the high end response is too high, a lower
value capacitor must be installed.
pele TTT TT TTT jt
t
SIR aa ’
RESPONSE IN dB
w
Li Co |
30 100 aK 10K 50K
‘500 1K
FREQUENCY IN He
Fig. 7-9 Frequency Response -Record-