Advertisement
www.freeservicemanuals.info
(4) Apply a 5kHz sine wave so as to obtain 17.5mV at J605.
(5) Record the output level at the TAPE MONITOR OUT jack with the above signal applied.
(6) Adjust the semi-fixed resistor R659 until the output level at the TAPE MONITOR OUT
jack may increase 10±0.25dB with J620 disconnected from the ground.
(7) Record the above output level.
(8) Adjust the semi-fixed resistor R653 until the output level may decrease 2±0.25dB with
J613 disconnected from the ground.
(9) Connect J613 to the ground again, and assure the level increase in Step (6) above.
Disconnect J613.
21.2
(1) Set the DOLBY switch to the RECORD II position.
(2) Connect J620 and J613 to the ground.
(3) Apply a 5kHz sine wave so as to obtain a 44mV at J605.
(4) Check to insure that the level at the TAPE MONITOR OUT jack decreases 10±0.5dB
with J620 disconnected from the ground.
(5) Disconnect J620 and J613 from the ground.
(6) Check to
is 17.5mV(±0.5dB).
21.3
For the level adjustment, set the DOLBY switch and SELECTOR switch to the RECORD I
and CD-4/AUX positions, respectively, and use the TAPE MONITOR OUT jack for the signal
output. By setting the 400Hz TONE pushswitch "in", the 400Hz sine wave is fed out. Adjust the
semifixed resistor RL11 for 580mV sine wave output voltage in both R and L channels. Then, set
the DOLBY switch to the RECORD II position, and apply the 400Hz signal for 580mV output
voltage. Adjust the semi-fixed resistors RL28 and RL29 until the DOLBY LEVEL meter may
point the Dolby level. Change over the METER switch, and perform this adjustment for both R
and L channels.
Next, adjust the semi-fixed resistor RL12 for 580mV output level with the DOLBY switch
set to the OFF position. Check the 400Hz output signal level after the level setting of semi-fixed
resistors RL11 and RL12. The output level must be precisely 580mV since it is the reference
level of the Dolby circuit.
22. DOLBY FM PRESET LEVEL CONTROL ALIGNMENT PROCEDURES
Connect an FM signal generator to the FM antenna. Set the signal generator for 400Hz and
50% modulation.
Set the FM signal generator to 98MHz and the DOLBY switch to the OFF position. Turn the
Tuning knob on Model 2325 until it tunes the 98MHz signal from the FM signal generator.
Then, set the DOLBY switch to the DOLBY FM position, and adjust the FM preset level
controls RC05 and RC06 until the DOLBY LEVEL meter may point the Dolby level. Change
over the METER switch, and perform this adjustment for both R and L channels.
insure that the output voltage at the TAPE MONITOR OUT jack
Digitized in Heiloo Netherland
5/30/2017
Advertisement
