Broadcasting system: B/G
Color system: PAL color bar
(2) Signal level
Input electric field: 46 ± 3 dBµ (IF AGC full gain), P/S = 10 dB
(3) Other conditions
CCIR IF (Input electric field: terminated with 75 Ω resistance)
As to VIDEO signal, use signal source equivalent to TG7.
Power supply: Vcc1-1 = 5.00 ± 0.05 [V]
• Adjustment
Monitor video detection signal (CP238) via a low-pass filter of 100 kHz cutoff frequency and adjust LLD coil
T200 so that its DC level is minimum (waveform’s amplitude is maximum).
• Confirmation
There should be no waveform distortion (erroneous synchronization, etc.), under sensitivity (video detector
output level is abnormally small, etc.).
• Block diagram
Signal
generator
Stabilizer
IF signal
VCC1-1
L-PCB
Detector OUT
Low-Pass Filter
Adjust to minimize the DC level.
DC IN
Oscilloscope
— 4 —
3. Free running frequency adjustment
• Conditions
(1) Signal
No signal (PAL standard signal should be applied only at synchronous check)
(2) Signal level
Input electric field only at synchronous check: 70 ± 3 dBµ (terminated with 75Ω resistance),
P/S = 10 dB
(3) Other conditions
CCIR IF input only at synchronous check (input electric field with 75 Ω termination).
Connect SYF terminal (CP725) and GND.
Power supply: Vcc1-1 = 5.00 ± 0.05 [V]
Room temperature: 20 ± 10 [°C]
• Adjustment
Monitoring HDB (CP705) with a frequency counter, adjust VR710 so that the frequency is 15.625 ± 0.1 [kHz].
• Caution
(1) Disconnect the wire between SYF terminal. Applying IF signal make sure that synchronization is normal
on the display.
• Block diagram
Signal
generator
IF signal
SYF
GND
HDB
Frequency
Counter
Stabilizer
L-PCB
VCC1-1
4. VCOM AC and VCOM DC coarse adjustment
• Conditions
(1) Signals
Broadcasting system: B/G
Color system: PAL color bar
(2) Signal level
Input electric field: 70 ± 3dBµ (terminated with 75Ω resistance), P/S = 10 dB
(3) Others
CCIR IF input (input electric field should be terminated with 75Ω resistance)
Use VIDEO signal equivalent to TG7.
Power supply should be Vcc1-1 = 5.00 ± 0.05V.
• Adjustment
(1) Confirm that the amplitude of VCOM output (CP750) is 6.0 ± 0.5 [V].
(2) Adjust VR730 so that Low level voltage of VCOM output (CP750) is 2.4 ± 0.2 [V].
• Block diagram
L-PCB
Signal
generator
IF signal
Stabilizer
VCC1-1
CP750
— 5 —
6.0 V
Oscilloscope
2.4 V
GND
5. Contrast, Bright adjustment
• Conditions
(1) Signals
Broadcasting system: B/G
Color system: PAL color bar
(2) Signal level
Input electric field: 70 ± 3 dBµ (terminated with 75Ω resistance), P/S = 10 dB
(3) Others
CCIR IF input (input electric field should be terminated with 75Ω resistance)
As to VIDEO signal, use signal source equivalent to TG7.
Supplying power should be VCC1-1 = 5.00 ± 0.05 V
• Adjustment
(1) Apply VCC2-3 (CP344) voltage on KILLER terminal (CP308) via 22 kΩ resistance.
(2) Triggering FRP signal (CP71 1), observe VB waveform (CP324) and adjust BRIGHT VR so that pedes-
tal-pedestal voltage becomes 5.0 ± 0.1[V].
(3) Adjust VR303 so that VB (CP324) waveform's pedestal - white peak voltage is 3.5 ± 0.1[V].
• Caution
(1) Make sure that waveforms are not distorted.
(2) After the adjustment, disconnect VCC2-3 voltage from the killer terminal.
(Reference: Use white 75% for PAL color bar.)
(3) Do not move BRIGHT VR until TINT and COLOR adjustments are completed.
• Block diagram
Signal
generator
Stabilizer
IF signal
VCC1-1
B output
L-PCB
CP308
3.5 – 0.1 V
VCC2-3
22 KΩ
5.0 – 0.1 V
Oscilloscope
— 6 —
6. COLOR adjustment
• Condition
(1) Signal
Broadcasting system: B/G
Color system: PAL color bar
(2) Signal level
Input electric field: 70 ± 3 dBµ (75Ω termination), P/S = 10 dB
(3) Other conditions
CCIR IF input (input electric field should be terminated with 75Ω resistance).
Use VIDEO signal equivalent to TG7.
Apply voltage of Vcc1-1 = 5.00 ± 0.05 [V]
• Adjustment
Adjust VR300 so that 4th pulse of VB waveform's (CP324) pedestal-peak amplitude is 3.5 Vp-p.
• Caution
(1) Perform after Contrast adjustment.
(2) VB waveform's pedestal-pedestal voltage should be fixed on 5.0 ± 0.1 [V].
• Block diagram
L-PCB
B output
3.5 Vp-p
Oscilloscope
Signal
generator
Stabilizer
IF signal
VCC1-1
7. BCC coil adjustment
• Condition
(1) Signal
Broadcasting system: B/G
Color system: PAL color bar
(2) Signal level
Input electric field: 70 ± 3 dBµ (75Ω termination), P/S = 10 dB
(3) Other conditions
CCIR IF input (input electric field should be terminated with 75Ω resistance).
Use VIDEO signal equivalent to TG7.
Apply voltage of Vcc1-1 = 5.00 ± 0.05 [V]
• Adjustment
Adjust BCC coil (T300) so that center 2 pulses of VB waveform (CP324) become level (3.5 ± 0.1 [V].)
• Caution
(1) Perform after COLOR adjustment.
(2) VB waveform's pedestal-pedestal voltage should be fixed on 5.0 ± 0.1 [V].
• Block diagram
L-PCB
B output
Oscilloscope
— 7 —
Signal
generator
Stabilizer
IF signal
VCC1-1
8. VCOM DC adjustment
• Conditions
(1) Signals
Broadcasting system: B/G
Color system: PAL
(2) Signal:Provide any PAL signal from AV Jack.
(3) Others
Power supply should be Vcc1-1 = 5.00 ± 0.05V.
• Adjustment
Monitoring Photo sensor AMP output with an oscilloscope via 50Hz band-pass filter, adjust VCOM DC VR
(VR730) so that 50Hz ripple component is minimum.
• Caution
Perform this adjustment when you replaced the display module.
Use specified jig to replace photoelectric parts
• Block diagram
Photo diode
EV-660C/I/N
AV JACK
Signal
generator
S1133
VCC1-1
Stabilizer
B.P.F.
Photosensor amp.
C2719
Oscilloscope
— 8 —
Adjustment procedures (EV-660D)
1. VCC2 adjustment, VCC7, VCC6, VCC5, VEE1 voltage check
• Condition
(1) Signal
No signal
(2) Other conditions
Power supply: Vcc1-1 = 5.00 ± 0.05 [V]
• Adjustment
Apply 5.00 ± 0.05 [V] on Vcc1-1.
Adjust VR100 so that Vcc2 (CP108) voltage becomes 4.80 ± 0.02 [V].
Broadcasting system: I
Color system: PAL color bar
(2) Signal level
Input electric field: 46 ± 3 dBµ (IF AGC full gain), P/S = 7 dB
(3) Other conditions
UK IF (Input electric field: terminated with 75 Ω resistance)
As to VIDEO signal, use signal source equivalent to TG7.
Power supply: Vcc1-1 = 5.00 ± 0.05 [V]
• Adjustment
Monitor video detection signal (CP238) via a low-pass filter of 100 kHz cutoff frequency and adjust LLD coil
T200 so that its DC level is minimum (waveform’s amplitude is maximum).
• Confirmation
There should be no waveform distortion (erroneous synchronization, etc.), under sensitivity (video detector
output level is abnormally small, etc.).
• Block diagram
Signal
generator
Stabilizer
IF signal
VCC1-1
L-PCB
Detector OUT
Low-Pass Filter
Adjust to minimize the DC level.
DC IN
Oscilloscope
— 9 —
3. Free running frequency adjustment
• Conditions
(1) Signal
No signal (PAL standard signal should be applied only at synchronous check)
(2) Signal level
Input electric field only at synchronous check: 70 ± 3 dBµ (terminated with 75Ω resistance),
P/S = 7 dB
(3) Other conditions
UK IF input only at synchronous check (input electric field with 75 Ω termination).
Connect SYF terminal (CP725) and GND.
Power supply: Vcc1-1 = 5.00 ± 0.05 [V]
Room temperature: 20 ± 10 [°C]
• Adjustment
Monitoring HDB (CP705) with a frequency counter, adjust VR710 so that the frequency is 15.625 ± 0.1 [kHz].
• Caution
(1) Disconnect the wire between SYF terminal. Applying IF signal make sure that synchronization is normal
on the display.
• Block diagram
Signal
generator
IF signal
SYF
GND
HDB
Frequency
Counter
Stabilizer
L-PCB
VCC1-1
4. VCOM AC and VCOM DC coarse adjustment
• Conditions
(1) Signals
Broadcasting system: I
Color system: PAL color bar
(2) Signal level
Input electric field: 70 ± 3dBµ (terminated with 75Ω resistance), P/S = 7 dB
(3) Others
UK IF input (input electric field should be terminated with 75Ω resistance)
Use VIDEO signal equivalent to TG7.
Power supply should be Vcc1-1 = 5.00 ± 0.05V.
• Adjustment
(1) Confirm that the amplitude of VCOM output (CP750) is 6.0 ± 0.3 [V].
(2) Adjust VR730 so that Low level voltage of VCOM output (CP750) is 2.4 ± 0.2 [V].
• Block diagram
L-PCB
Signal
generator
IF signal
Stabilizer
VCC1-1
CP750
— 10 —
6.0 V
Oscilloscope
2.4 V
GND
5. Contrast, Bright adjustment
• Conditions
(1) Signals
Broadcasting system: I
Color system: PAL color bar
(2) Signal level
Input electric field: 70 ± 3 dBµ (terminated with 75Ω resistance), P/S = 7 dB
(3) Others
UK IF input (input electric field should be terminated with 75Ω resistance)
As to VIDEO signal, use signal source equivalent to TG7.
Supplying power should be VCC1-1 = 5.00 ± 0.05 V
• Adjustment
(1) Apply VCC2-3 (CP344) voltage on KILLER terminal (CP308) via 22 kΩ resistance.
(2) Triggering FRP signal (CP71 1), observe VB waveform (CP324) and adjust BRIGHT VR so that pedes-
tal-pedestal voltage becomes 5.0 ± 0.1[V].
(3) Adjust VR303 so that VB (CP324) waveform's pedestal - white peak voltage is 3.5 ± 0.1[V].
• Caution
(1) Make sure that waveforms are not distorted.
(2) After the adjustment, disconnect VCC2-3 voltage from the killer terminal.
(Reference: Use white 75% for PAL color bar.)
(3) Do not move BRIGHT VR until TINT and COLOR adjustments are completed.
• Block diagram
Signal
generator
Stabilizer
IF signal
VCC1-1
B output
L-PCB
CP308
3.5 ± 0.1 V
VCC2-3
22 KΩ
5.0 ± 0.1 V
Oscilloscope
— 11 —
6. COLOR adjustment
• Condition
(1) Signal
Broadcasting system: I
Color system: PAL color bar
(2) Signal level
Input electric field: 70 ± 3 dBµ (75Ω termination), P/S = 7 dB
(3) Other conditions
UK IF input (input electric field should be terminated with 75Ω resistance).
Use VIDEO signal equivalent to TG7.
Apply voltage of Vcc1-1 = 5.00 ± 0.05 [V]
• Adjustment
Adjust VR300 so that 4th pulse of VB waveform's (CP324) pedestal-peak amplitude is 3.5 Vp-p.
• Caution
(1) Perform after Contrast adjustment.
(2) VB waveform's pedestal-pedestal voltage should be fixed on 5.0 ± 0.1 [V].
• Block diagram
L-PCB
B output
Signal
generator
IF signal
3.5 Vp-p
Oscilloscope
Stabilizer
VCC1-1
7. BCC coil adjustment
• Condition
(1) Signal
Broadcasting system: I
Color system: PAL color bar
(2) Signal level
Input electric field: 70 ± 3 dBµ (75Ω termination), P/S = 7 dB
(3) Other conditions
UK IF input (input electric field should be terminated with 75Ω resistance).
Use VIDEO signal equivalent to TG7.
Apply voltage of Vcc1-1 = 5.00 ± 0.05 [V]
• Adjustment
Adjust BCC coil (T300) so that center 2 pulses of VB waveform (CP324) become level (3.5 ± 0.1 [V].)
• Caution
(1) Perform after COLOR adjustment.
(2) VB waveform's pedestal-pedestal voltage should be fixed on 5.0 ± 0.1 [V].
• Block diagram
L-PCB
Signal
generator
IF signal
Stabilizer
B output
VCC1-1
Oscilloscope
— 12 —
8. VCOM DC adjustment
• Conditions
(1) Signals
Broadcasting system: I
Color system: PAL
(2) Signal:Provide any PAL signal from AV Jack.
(3) Others
Power supply should be Vcc1-1 = 5.00 ± 0.05V.
• Adjustment
Monitoring Photo sensor AMP output with an oscilloscope via 50Hz band-pass filter, adjust VCOM DC VR
(VR730) so that 50Hz ripple component is minimum.
• Caution
Perform this adjustment when you replaced the display module.
Use specified jig to replace photoelectric parts