Teac A-3440 - Simul-Sync Performance; Sync Playback Level; Sync Frequency Response Playback; Sync S;N Ratio Check

12-SIMUL-SYNC PERFORMANCE
12-1 SYNC PLAYBACK LEVEL
OUTPUT SELECT SW......... SYNC
1. Connect a VTVM to the OUTPUT jack.
2. Play the 400 Hz 0 dB tone in section 1 of the YTT-1003
Test Tape.
3. Check for —8 dB +1 dB (356 mV — 275 mV) at the
OUTPUT jack.
12-2 SYNC FREQUENCY RESPONSE
— PLAYBACK—
4. Apply a signal swept from 50 Hz to 6.3 kHz at —12 dB
(195 mV) and while monitoring the off-tape signal check
for readings within the Response Limits.
HIGH (5 ips
50 0 125 400 500 « 4K SKG3K 10K
FREQUENCY mW Hz
Fig. 8-15 SYNC Freq. Response
12-3 SYNC S/N RATIO CHECK
1. OUTPUT Level Control should be at the Specified Out-
put Level Setting.
2. Remove the Test Tape from the deck. Hold the shut-
off arm (right) in the ON position.
3. Press the PLAY (>) button.
4. The VTVM connected to the OUTPUT jack should in-
dicate the values below.
OUTPUT SELECT SW | Tape Speed
| 7-1/2 ips —48 dB
15 ips | —48 4B
SYNC
NOTE: This corresponds to a signal-to-noise ratio of 40 dB
(for SYNC 7-1/2 ips). It is the difference between
the residual noise of —48 dB and the specified out-
put level —8 dB.
22
12-4 SYNC CHANNEL SEPARATION
TAPE SPEED SELECTOR SW_ HIGH (15 ips)
FUNCTION SELECT SW......... all ON
—
. Repeat the page 21, item 11-7 procedure and check the
crosstalk in the SYNC mode. The level should be —53
dB or better (spec. 45 dB).
12-5 SYNC CROSSTALK CHECK
1. Apply a 2 kHz -12 dB (194 mV) signal from the AF
oscillator to the LINE IN jacks 1,3 and 4.
2. Place the deck in the REC and PAUSE mode.
3.
Ensure
that
the
FUNCTION
SELECT
SW
for
channel
2
is
OFF.
4. Check the difference in level between the Sync output
(1,3 and 4) and (2).
The difference should be 8 dB or less.
5.
Repeat
these
procedures
for
channels
(1,2
and
4)
and
between
3.