Sharp 37VT-26H Service Manual page 16

37VT-26H(GY)
Ë Ë Ë Ë Ë PAL CHROMA ADJUSTMENT
1. SUB-COLOUR ADJUSTMENT (I
1. Receive the PAL colour bar signal.
2. Put the set in the service mode.
3. Select the sub-colour mode (COL).
4. Connect the oscilloscope to TP1852 (RED cath-
ode). (Use a 10 : 1 probe.)
» Range:
» Sweep time: 20 µsec/div.
5. Adjust the sub-colour data so that the 75% white
and red portions of the PAL colour bar be at the
same level. See Fig. 4 .
6. Exit from the service mode.
» When getting out of the SUB-COLOUR mode,
the sub-colour data turns up 15.
Ë Ë Ë Ë Ë NTSC CHROMA ADJUSTMENT
1. SUB-TINT ADJUSTMENT (I
1. Receive the NTSC colour bar signal.
2. Put the set in the service mode.
3. Select the SUB-TINT mode (TINT).
4. Connect the oscilloscope to TP802 (B-Y OUT).
» Range :
» Sweep time : 10 µsec/div.
(Use a 10 : 1 probe.)
5. Adjust the sub-tint data to obtain the waveform as
shown in Fig. 5 .
6. Exit from the service mode.
Ë Ë Ë Ë Ë A/V INPUT AND OUTPUT CHECK (1)
1. VIDEO and AUDIO OUTPUT CHECK
1. Receive the E-69CH.
(100% white colour bar, 400 Hz, 100% modulation audio)
2. Terminate the video output with a 75Ω impedance. Make sure the out-
put is as specified
(1.0 Vp-p ± 3 dB(0.71 – 1.41 Vp-p).
3. Terminate the audio output with a 10k ohm impedance. Make sure the
output is as specified (2.6 Vp-p ± 3 dB(1.84 – 3.67 Vp-p).
» Make sure the video and audio signals from the tuner are outputted.
2. VIDEO and AUDIO INPUT CHECK
1. Receive the E-69CH.
2. Feed the video and audio signal via the A/V input jacks.
3. Using the CH '/" keys on the remote controller, change to the AV
mode and make sure the external video and audio outputs are accord-
ingly given.
(The AV mode can be picked up between 1CH and 0CH.)
CH ' 99 → 0 → AV1 → AV2 → 1 → 2
2 → 1 → AV2 → AV1 → 0 → 99
CH "
» The AV mode may also be picked up using the TV/VIDEO key on
the remote controller.
RF → AV1 → AV2 → RF
2 C bus data adjustment)
20 V/div.
2
C bus data adjustment)
10 mV/div. (AC)
W Y CY G MG R B
To be at the same level
W Y CY G MG R B
16
Fig.4
About 3 Vp-p
Fig.5
WAVEFORM & OTHER
21PIN SCART
VIDEO OUT 19 PIN
AUDIO OUT 1, 3 PIN
SC401(REAR)........AV1
WAVEFORM & OTHER
SC401(REAR)........AV1
J1401(FRONT).......AV2