Adjustment Procedure - NAD 705 Service Manual

A : AM SECTION
1 . V .C .O . ADJUSTMENT .
A . MEASURE THE VOLTAGE BETWEEN TP7 AND TP4 (GROUND) . (FIG 4) .
B . SELECT AM MODE, AND SET THE UNIT UNDER TEST TO 520 KHZ (UL,
CSA) .
(522 KHZ UK, AY, EU) .
C . ADJUST T406 UNTIL THE VOLTAGE BETWEEN TP7 AND TP4 IS IN THE
RANGE 0 .9 V TO 1 .1 V .
D . SET THE UNIT UNDER TEST TO 1610 KHZ (UL, CSA)
(1611 KHZ UK, AY, EU) .
CHECK THAT THE VOLTAGE BETWEEN TP4 AND TP7 IS IN THE RANGE
7 .35 V TO 7 .65 V .
2 . SENSITIVITY ADJUSTMENT .
A . CONNECT THE UNIT UNDER TEST AS SHOWN IN FIG . 5 . MAKE SURE
THAT THE SIGNAL GENERATOR IS CONNECTED VIA A 22P CAPACITOR .
B . SET THE SIGNAL GENERATOR AND UNIT UNDER TEST TO 600 KHZ
(UL, CSA)
(603 KHZ UK, AY, EU), 30dBUv .
C . ADJUST T405 FOR MAXIMUM OUTPUT LEVEL .
D . SET THE SIGNAL GENERATOR AND UNIT UNDER TEST TO 1400KHZ
(UL, CSA) (1404 KHZ UK, AY, EU) .
E . ADJUST TC404 FOR MAXIMUM OUTPUT .
3 . IF TRACKING
ADJUSTMENT PROCEDURE
A . USING THE TEST SET-UP DESCRIBED ABOVE (FIG . 5) SET THE SIGNAL
GENERATOR AND UNIT UNDER TEST TO 600 KHZ (UL, CSA)
(603 KHZ UK, AY, EU), 30dBUv .
B . ADJUST T407 FOR MAXIMUM OUTPUT .
B : FM SECTION .
1 . V .C .O . ADJUSTMENT .
A . CONNECT A DC VOLTMETER TO TP7 AND TP4 (GND) (FIG . 4) .
B . SET THE UNIT UNDER TEST TO 87 .5 MHZ FM MODE .
C . ADJUST L402 UNTIL THE VOLTAGE MEASURED IS IN THE RANGE
3 .0 V TO 3 .1 V .
D . SET THE UNIT UNDER TEST TO 108 MHZ . CHECK THE VOLTAGE MEASURED
IS IN THE RANGE 22 V TO 25 V .
2 . 7 .2 MHZ REFERENCE FREQUENCY ADJUSTMENT .
A . CONNECT A FREQUENCY COUNTER TO TP5 (FM OSC) AND GROUND
(FIG 7) .
B . SET THE UNIT UNDER TEST TO 90 MHZ FM MODE .
C . ADJUST TC405 FOR A MEASURED FREQUENCY OF 100 .7 MHZ +/- 3HZ .