Teac A-3340S - Page 27

BIAS ADJUSTMENT
Adjust BIAS trap (L-302/304) before adjusting BIAS levels.
These adjustments are only made at 7~1/2 ips tape speed.
The bias oscillator frequency is 100 +5 kHz.
RECORD HEAD AZIMUTH ADJUSTMENT
HIGH Position
1. Thread a record test tape (Scotch 203) on the unit. Place BIAS/EQ
switch in HIGH position.
2. Place OUTPUT siwtches in TAPE position, PAUSE switch at PLAY,
3. Apply a 400 Hz signal at -8 dB at the LINE IN jacks.
4. Adjust VC-501/503 for a peak on the Test Set.
5. Turn thé capacitors clockwise until a decrease of 0.5 dB is
obtained.
NORMAL Position
1. Thread a record test tape (Scotch 150) on the unit. Place BIAS/EQ
switch to NORMAL position.
2. Adjust VC-502/504 as in HIGH position.
Coarse Adjustment:
NOTE: The effect of turning the azimuth screw will not immedi-
ately register on the Test Set. A slight delay will be noticed.
Therefore, the screw must be rotated slightly with a pause to >
see the effect.
Connect a Test Set to the OUTPUT jack and an AF oscillator to
the LINE IN jack, then set the AF oscillator to 10 kHz.
Make certain that the LINE controls are at the Specified Input
Level positions.
Place the MONITOR switch to SOURCE and adjust the AF oscillator
to obtain a signal of 20 dB below the Specified Output Level.
Thread a record Test Tape on the unit.
Place the MONITOR switch in the TAPE position.
While recording adjust the azimuth screw for maximum indication
on the Test Set,
Proceed to the next page "Fine Adjustment"