Service Adjustment - Sharp SX80J9 Service Manual

FACTRY SETTINGS
ITEM DATA SETTING
SKIP OFF
AFT ON
C-SYSTEM AUTO
S-SYSTEM B/G
IGR FORCED FM ON
IGR MODE ST, MAIN
NICAM FORCED FM ON
NICAM MODE M1
LAST POWER ON
LAST TV/AV (MAIN/SUB) TV
DIGIT 2DIG
LANGUAGE ENGLISH
BULE BACK ON
AV MENU STANDARD
AUTO SELECT OFF
LAST POS (MAIN/SUB) 1
LAST FB POS 1
VOLUME 0
BALANCE 0
CONTRAST INITIAL VALUE OF EACH AV MENU MODE
COLOUR INITIAL VALUE OF EACH AV MENU MODE
BRIGHTNESS INITIAL VALUE OF EACH AV MENU MODE
TINT INITIAL VALUE OF EACH AV MENU MODE
SHARPNESS INITIAL VALUE OF EACH AV MENU MODE
YNR INITIAL VALUE OF EACH AV MENU MODE
BKGD INITIAL VALUE OF EACH AV MENU MODE
TREBLE INITIAL VALUE OF EACH AV MENU MODE
BASS INITIAL VALUE OF EACH AV MENU MODE
U-BASS INITIAL VALUE OF EACH AV MENU MODE
AV MENU : STANDARD ON 1 LEVEL 0
SPATIALIZER
OTHER AV MENU : INITIAL VALUE
TIMER CLEAR
SAVE OFF
HEAD PHONE AUTO (LEVEL: CENTER)
INSET TINT 0
DEMO OFF
PIP DISPLAY POSITION LOWER RIGHT
6-1

SERVICE ADJUSTMENT

PIF/AFT/AGC ADJUSTMENT
1. TUNER IFT (preset) ADJUSTMENT: TU201(TU101)
1. Get the tuner ready to receive the E-9CH
signal,but with no signal input. Adjust PLL data.
2. Connect the sweep generator's output cable to
the tuner antenna. (RF sweep)
3. Adjust the sweep generator's output level to
80dBµV.
4. Connect the responce lead (use a low-imped-
ance probe with wave detector; see Fig.1 .) to
the tuner's IF output terminal.
(This terminal must have the probe alone con-
nected.)
5. Set the RF AGC voltage to 0-6V with no contact
with waveform.
6. Adjust the tuner IF coil to obtain the waveform as
shown in Fig.2 .
Note: Be sure to keep the tuner cover in position
during this adjustment.
2. VCO ADJUSTMENT: T203 (T103)
1. Disconnect the antenna from the tuner antenna terminal.
2. Apply DC voltage at pin (4) (IF AGC) of IC201 (IC101).
6.0 ± 0.1 V TP202 (TP102)
3. Using a digital voltmeter, measure the DC voltage at pin (20) (PLL FIL) of IC201 (IC101).
* Prepare a digital voltmeter capable of reading down to the third decimal place.
4. Remove the DC voltage from pin (4) of IC201 (IV101).
5. Reconnect the antenna and receive the E-12CH signal. (With the AFT off, set the receiving frequency to
224.25 MHz.)
6. Connect the DC digital voltmeter to pin (20) of IC201 (IC101). Adjust T203 ( T103) to get the voltage
measured in the above step 3.
Allowable error: ± 0.015 V (20 kHz)
Note: Operate PIP when you adjust T103.
IF-OUT
1000p
10kΩ
100kΩ
1000p
75Ω
Oscilloscope
Fig. 1
E9CH
P C
- 1.5dB 0.8dB
Fig. 2
6-2