Input Level Adjustment; Purity And Convergence Adjustments - Sanyo DS32424 Service Manual

MULTI-SOUND SECTION ADJUSTMENTS
Note: Multi-Sound Section must be adjusted after
A101 (U/V Tuner), IC3401 (MTS Decoder), or IC802
(EEPROM) is replaced.

INPUT LEVEL ADJUSTMENT

1. Connect a signal to the antenna terminals with audio of
1 KH 100% modulation.
Z
2. Turn off the receiver and disconnect the AC power cord
(AC 120V line).
3. Connect voltmeter (RMS) to TP317 and ground.
4. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.
5. Select NO. 80 ATT (MTS Input Level) with the
key.
6. Adjust the + or – key for a voltmeter reading of 400 ± 20
mVrms at TP317.
SEPARATION ADJUSTMENT
7. Turn off the receiver and disconnect the AC power cord
(AC 120V 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 will now appear.
11. Select pilot, 300Hz audio frequency and Left modulating
signal.
12. Select NO. 81 WDB (Wide Band) with the
13. Adjust the + or – key for minimum low frequencies at
TP317. See Figure 9.
14. Select 4 KHz audio frequency and Right modulating signal.
15. Select NO. 82 SPC (Spectral) with the
16. Adjust the + or – key for minimum high frequencies at
TP318. See Figure 9.
Repeat adjustments (steps 11–16) until no further decreases
in amplitude can be obtained. Press the MENU key to turn
off the Service Menu display.
Minimize L leakage
TP317 (R)
TP318 (L)
Figure 9. Separation Adjustments

PURITY AND CONVERGENCE ADJUSTMENTS

Purity and Convergence have been aligned at the factory.
No re-alignment is necessary.
SERVICE ADJUSTMENTS (Continued)
or
or key.
300Hz
Minimize R leakage
4KHz
PINCUSHION CORRECTION ADJUSTMENT
1. Connect a color-bar generator to the antenna terminals
and select a crosshatch pattern.
2. Set the picture controls to the Sports level.
3. Turn off the receiver and disconnect the AC power cord
(AC 120V line).
4. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.
5. Select No. 62 EWT with
key for equal tilt at top and bottom.
Ta
or
Tb
6. Select No. 61 EWA with
key for straight vertical lines at the center.
key.
7. Select No. 63 EWB4EWP with
or – key for straight vertical lines at the top.
8. Select No. 63 EWB4EWP with
4 ~ 7 keys for straight vertical lines at the bottom.
EWP
EWB
9. Repeat steps 5 through 8 for best pincushion adjustment.
10. Press the MENU key to turn off the Service Menu display.
— 10 —
or key and adjust with + or –
Tc
Adjust No. 62 EWT for equal tilt:
Ta=Tb, Tc=Td.
Td
Figure 7.
or key and adjust with + or –
Adjust No. 61 EWA for the center
part of the vertical line to be straight.
Figure 8.
or key and adjust with +
or key and adjust with
Adjust No. 63 EWP for straight vertical
lines at the top. (+ or – keys)
Adjust No. 63 EWB for straight vertical
lines at the bottom. (4 ~ 7 keys)
Figure 9.