Sansui QS-500 - Page 16

ALIGNMENT
OUTPUT ALIGNMENT OF REAR-CHANNEL
POWER AMPLIFIER
CURRENT ALIGNMENT OF REAR-GHANNEL
POWER AMPLIFIER
STEP CONNECT “ADJUST REMARKS STEP : CONNECT “ADJUST |
1. | Turn the Rear Volume i | Remove Foo; and Fooe
Control fully counterclock-
wise. 2. | Turn VReoo and VRgoq. fully
_ counterclockwise
Zz. Set an oscillator to 1kHz, | Use oscillator with |
then connect it to4CHAN- | output capacity great- 3. | Turn on Power/Rear
NEL TAPE MON rear | er than 200mV. Set | Speakers Switch. |
| left-channel input terminal. | all three Balance
Controls in center 4.
3. | Push down 4 Channel Tape | and turn up* master where Fo; was (Refer to
Monitor Switch. ' Volume Control to | Fig. 1.)
maximum. |
4. Ԥ Connect an 8-ohm (or 16- |
| ohm) resistor (minimum
| rating of 50 watts) to SYS- 5. | Turn VRgo2 slowly clock-
. TEM A rear left-channel wise until ammeter shows
| speaker terminals. 15-20mA.
5. | Connect an oscilloscope to 6. | Turn off power, then re-
_ the same speaker terminal. place Foo.
6. | Set Power/Rear Speakers Ts Turn on power again.
Switch to “SYSTEM A’”’ | |
position. 8. Now, connect ammeter
(tester) where Foo. was
7 Turn Rear Volume Control (Refer to Fig. 1.)
slowly clockwise.
| 9. | Turn VRgoq slowly clock-
8. | Adjust VRgoi so that both | wise until ammeter shows
| peaks of output, wave form ; __/ 15-20mA.
| are clipped simultaneously. |
| | 10. | Turn off power, then re-
9. For rear right-channel, place Foo.
| repeat above procedure, but
| adjust VRgo3 in step 8.
STEP | CONNECT “ADJUST
1. Set your QS-500’s three Balance Controls at re- a —
spective center positions.
TO AMMETER
2. Push down 4 Channel Tape Monitor Switch.
3. Set a low-frequency oscillator to 1kHz, 775mV,
then connect it to 4 CHANNEL TAPE MON
front left-channel input terminal.
4. Adjust VRso; so that front left-channel VU meter
swings to ‘‘0’’. .
5. Make same adjustments with VRso2, VRso3, WRsoa
|
|
REMARKS
Connect ammeter (tester) | Be sure power is
for front right, rear left and rear right channel
VU meters, respectively.
=. {6 -———
Ba? ghee,
¢Fig. > QUICK-ACTING FUSE HOLDER
turned on before con-
| necting ammeter.
Set ammeter to its
90-100mA range.
Same as step 4.
AMMETER
more than
1OOmA range