28
ELECTRICAL ADJUSTMENTS
CAUTION
When you exchange IC and Transistor for a heat sink,
apply the silicon grease (YG6260M) on the contact
section of the heat sink. Before applying new silicon
grease, remove all the old silicon grease. (Old grease
may cause damages to the IC and Transistor.)
1-1: PG SHIFTER
CONDITIONS
MODE-PLAYBACK
Input Signal-Alignment Tape (JG001C)
INSTRUCTIONS
Connect CH-1 on the oscilloscope to TP4001 and CH-2
to pin 5 of CP4503.
Playback the alignment tape. (JG001C)
Press both CH UP button and STOP button on the set for
more than 2 seconds. If the indicator ATR disappear's,
the adjustment is finished. (Refer to Fig. 1-1-A, B)
6.5H
CH-1
CH-2
CH-1
CH-2
6.5H
Fig. 1-1-A
Fig. 1-1-B
Read and perform this adjustment when repairing the
circuits or replacing electrical parts or PCB assemblies.
1. BASIC ADJUSTMENT
1.
2.
3.
1-2: PB-Y LEVEL
Connect the oscilloscope to pin 5 of CP4503 through 75
ohm resistor.
Playback the alignment tape. (JG001D)
Check if the VIDEO OUTPUT LEVEL is 1.05
±
0.15Vp-p.
(Refer to Fig. 1-2)
1.
2.
3.
Fig. 1-2
1.05Vp-p
1-3: E-E LEVEL
Connect the color bar generator to pin 9 of CP4503.
Connect the oscilloscope to pin 5 of CP4503 through 75
ohm resistor.
Check if the VIDEO OUTPUT LEVEL is 1.05
±
0.15Vp-p.
(Refer to Fig. 1-3)
1.
2.
3.
Fig. 1-3
1.05Vp-p
CONDITIONS
MODE-PLAYBACK
Input Signal-Alignment Tape (JG001D)
INSTRUCTIONS
CONDITIONS
MODE-STOP
Input Signal-PAL Color Bar
INSTRUCTIONS
1-4: E-E AUDIO LEVEL
1.
2.
3.
Connect the audio generator to pin 7 of CP4503.
Connect the AC voltmeter to pin 3 of CP4503 through
47K ohm resistor.
Check if the AUDIO OUTPUT LEVEL is 500mVrms
±
2
dB.
CONDITIONS
MODE-STOP
Input Signal-Audio Signal: 1KHz, 500mVrms
Input Select-AV
INSTRUCTIONS
