Teac A-3340 - BIAS ADJUSTMENT PROCEDURES; NORMAL POSITION BIAS ADJUSTMENT; HIGH POSITION BIAS ADJUSTMENT; RECORD HEAD AZIMUTH ADJUSTMENT

BIAS ADJUSTMENT
NOTE
These adjustment are only made at 7-1/2ips tape speed,
The bias oscillator frequency is 100 +5 kHz.
-HIGH position-
1. Thread record test tape Scotch 203 on the unit.
2. Place the bias switch to HIGH and place the unit in the record
mode. Place the MONITOR switch in the TAPE position. Apply a
400 Hz signal at -8 dB to LINE IN jacks.
3. Adjust capacitor VC 401/403 for a peak on the level meter.
Turn the capacitors clockwise until a decrease of 0.5 dB is ob-
tained.
-NORMAL position-
4. Thread record test tape Scotch 150 on the unit.
5. Place the bias switch to NORMAL and place the unit in the record
mode.
6. Adjust capacitor VC 402 and VC 404 for a peak on the level meter.
Turn the capacitors clockwise until a decrease of 0.5 dB is ob-
tained.
RECORD HEAD AZIMUTH ADJUSTMENT
Coarse Adjustment
NOTE
The effect of turning the azimuth screw will not immediately
register on the level meter. A slight delay will be noticed.
Therefore, the screw must be rotated slightly, and then pause
to see the effect.
1. Connect a Level Meter to the OUTPUT jacks and an AF oscillator
to the LINE IN jacks.
2. Place the MONITOR switch to SOURCE and adjust the AF oscillator
to obtain a signal of 15 dB below the specified output level.
(The level meter will indicate -23 dB.)
3. Make certain that the LINE control is at the specified input
level position, then set the AF oscillator to 10 kHz.
4. Thread a record test tape on the unit and place the mode L°R
switches up.
5. Place the MONITOR switch in the TAPE position.
6. Adjust the azimuth screw for maximum indication of the level
meter.