SHARP SX68JF100
Manual de Servicio

SECAM CHROMA ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions 1 BELL FILTER f0 1 Receive Oi-5CH(SECAM colour bar). (SCM BELL) 2 Select the "SCM BELL" fo adjustment mode. I2C bus 3 Connect the oscilloscope to TP901 of main. adjustment (TP2901 in VCJ unit) Range : 10mV/Div. (AC) Sweep time: 20µsec/Div. (10:1 probe is used.) 4 Vary the bell filter data to align the waveform to be the nearest to that in Fig. 5 (b). (Arrange the level to gain the whole balance.) Waveform and others

SOUND LEVEL ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions 1 SUB SOUND 1 Receive E-12ch (PAL colour bar). Signal con(SUB VOL) tent: 400Hz 100% Mod. (I2C bus 2 Connect the probe of the meter to (SI) conadjustment) nector. (See Note) 3 Select "SUB VOL" in the service mode. 4 Adjust the sub-sound data to make the meter indicate 8.5Vrms (at L-ch). Adjustment value : 8.5 ± 0.4Vrms Waveform and others Note: * SPATIALIZER ..... OFF * S-Normal state * S-VOL ................ Max * S-BOOSTER ...... OFF

adjust

Fig. 5( a)

Fig. 5 (b) * To be at the same levbel. 2 SECAM black level R-Y/B-Y (R-Y and B-Y) I2C bus adjustment 1 Receive Oi-5CH(SECAM colour bar). 2 Select SECAM black level adjustment "R-Y" mode. 3 Connect the oscilloscope to TP802 (TP2804 in VCJ unit) of the main. Range: 10mV/Div. Sweep time: 20µsec/Div. (10:1 probe is used.) 4 Vary R-Y data to minimize the offset between the non-signal line and signal line as shown in Fig. 6 (b). 5 Select SECAM black label adjustment "B-Y" mode. 6 Reconnect the oscilloscope to TP803 (TP2805 in VCJ unit) of the main. The conditions are the same as in Item (3). 7 Vary B-Y data to minimize the offset between the non-signal line and signal line as shown in Fig. 7 (b). Fig. 6 (b) 2 Noise mute check 1 Receive E-12CH (PAL colour bar). 2 Maximize the sound volume to verify that the sound is output from the speaker. Then, set the non-signal state. 3 At this time, verify that the audio mute operates. 4 After checking the operation, set the sound volume to be the minimum. Fig. 6 (a)

OFF SET

SIF (NICAM/IGR) ADJUSTMENT
NO. Adjustment part 1 VCO COIL T2300 (in the NICAM unit) Adjusting procedure and conditions 1 Receive E-69CH (PAL colour bar). (Set the receiving frequency at AFT OFF Ex. E-69=855.25 MHz.) 2 Connect the digital voltmeter to TP301 (in the main unit). 3 Verify that it is turned counterclockwise to 0V and clockwise to 5V, and adjust T2300 to make the DC voltage of TP2300 become 2.5 ± 0.1V in the range. <Single-unit adjustment> - For your Reference. Vcc 5 ± 0.1V IF input frequency 38.9MHz ± 10kHz Control it under these conditions.
OFF SET

Waveform and others

7

Fig. 7 (a)

Adjust T2300 to make the DC voltage of TP2300 (in the NICAM unit) become 2.5 ± 0.1V. After single-unit adjustment, check the practical setup. Align the receiving frequency to the select channel frequency. (AFT OFF) The checked TP301 in the main unit voltage must be 2.5 ± 1.0V. (Take care that ±1.0 is considered for the Vcc difference between the single unit and unit, Fo difference and so on, but is not the adjustment precision.)

SX68JF100

Fig. 7 (b)

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