— 9 —
SOUND ADJUSTMENT
1. Connect a color-bar generator to the antenna terminal with
audio signal of 1KHz at 100% modulated.
2. Set the picture controls to the Sports levels.
3. Connect oscilloscope + lead to TP21 (base Q135) and –
lead to ground.
4. Turn off the receiver and disconnect the AC power cord
(120V AC line).
5. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.
6. Select No. 45 FL (FM Level) with ▲ or ▼ key.
7. Adjust the data with + or – key for an oscilloscope reading
of 0.693 ±10% Vp-p at TP21.
8. Press the MENU key to turn off the Service Menu display
and disconnect the oscilloscope fromthe chassis.
Figure 8. Separation Adjustments
SEPARATION ADJUSTMENT
7. Turn off the receiver and disconnect the AC power cord
(120V AC line).
8. Connect oscilloscope CH1 to TP317 and CH2 to TP318
and ground.
9. Connect an MTS TV/Stereo generator to antenna terminal.
10. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.
11. Select pilot , 300Hz audio frequency and Left modulating
signal.
12. Select NO. 61 WDB (Wideband) with ▲ or ▼ key.
13. Adjust the + or – key for minimum low frequencies at
TP317.(See Figure 8.)
14. Select 4K Hz audio frequency and Right modulating signal.
15. Select NO. 62 SPC (Spectral) with ▲ or ▼ key.
16. Adjust the + or – key for minimum high frequencies at
TP318.(See Figure 8.)
Repeat adjustment (steps 11-16) until no further decrease in
amplitude can be obtained. Press the MENU key to turn off the
Service Menu display.
0.693 ±10% Vp-p
Figure 7.
MULTI-SOUND SECTION ADJUSTMENTS
Note: Multi-Sound Section must be adjusted after IC101
(Signal Processor), IC3401 (MTS Decoder) or IC802
(EEPROM) is replaced.
INPUT LEVEL ADJUSTMENT
1. Connect a signal to the antenna terminal with audio signal
of 1KHz at 100% modulated.
2. Turn off the receiver and disconnect the AC power cord
(120V AC line).
3. Connect voltmeter (RMS) to TP317 and ground.
4. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.
5. Select NO. 60 ATT (Attenuation) with ▲ or ▼ key.
6. Adjust the + or – key for a voltmeter reading of 400 ±20
mVrms at TP317.
