4
72FF-57E
81FF-57E
•••••
G2 ADJUSTMENT
1. Receive cross hatch pattern signal.
2. Set Picture Adjustement to Factory Settings (contrast to 70%,
brithness to 40%)
3. Connect the oscilloscope to the red cathode and adjsust G2 to read
145V on the sensor pulse as in the drawing:
NOTE:
Oscilloscope should be adjusted for vertical TV field trigger and synchronized
with wideo signal.
CH1
20 V
A 2 ms
TVF1 5
B 50 ms
95.40 V
•••••
SERVICE MODE FUNCTION
This mode function is provided to assist with the settings of those adjustments that may vary from one
Picture Tube to another, or between models.
In order to use the Service Mode:
1. Connect Test Pattern signal to antenna terminal.
Set to full mode screen by wide button.
2. Press main switch to «OFF».
3. Press volume-down and channel-up buttons and
main switch to «ON» simultaneously.
4. Service mode is now entered.
CH
1
2
•••••
RF AGC ADJUSTMENT
1. Receive «COLOUR BAR» signal (UHF)
•••••
Signal strength:
60 dB
µ
V
2. Connect DC Voltmeter to Test Point TP201 (RF AGC).
3. Set AGC control (R224) to maximum position (memory).
4. Adjust R224 to obtain voltage of 0.1 V below maximum voltage (step 3).
•••••
IF PLL ADJUSTMENT (AFT) B/G, L, I
1. Disconnect antenna signal.
2. Connect the output of SSG (Standard Signal Generator, colour bars) to the output terminal
•••••
SSG output:
38.9 MHz (CW)
±
5 KHz
•••••
SSG output level:
approx. 90 dB
µ
V
•••••
Probe:
Direct.
3. Connect the digital voltmeter to TP202
4. Adjust the AFT coil (L 205) to obtain 4.5V
DC
on voltmeter.
SERVICE ADJUSTMENTS
All the adjustments required for this chassis will be done in Service Mode, except G2 and Focus.
CH1 gnd
•••••
IF PLL ADJUSTMENT (AFT) L’
1. Disconnect antenna signal.
2. Connect the output of SSG (Standard Signal Generator, monoscope) to the output terminal
•••••
SSG output:
33.9 MHz (CW)
±
5 KHz
•••••
SSG output level:
approx. 90 dB
µ
V
•••••
Probe:
Direct.
3. Connect the digital voltmeter to TP202
4. Adjust the AFT R 226 to obtain 4.5V
DC
on voltmeter.
145V
Summary of Contents for 72FF-57E
Page 18: ...18 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 POWER SWITCH UNIT PRINTED WIRING BOARDS ...
Page 19: ...19 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 SOUND OUTPUT UNIT PRINTED WIRING BOARDS ...
Page 22: ...22 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 100Hz UNIT PRINTED WIRING BOARDS ...
Page 24: ...24 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 Page 25 MOTHER UNIT 1 SCHEMATIC DIAGRAM ...
Page 34: ...34 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 POWER SWITCH UNIT SCHEMATIC DIAGRAM ...
Page 35: ...35 72FF 57E 81FF 57E FRONT A V UNIT SCHEMATIC DIAGRAM 1 I H G F E D C B A 2 3 4 5 6 7 ...
Page 36: ...36 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 Page 37 SCART UNIT SCHEMATIC DIAGRAM ...
Page 38: ...38 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 Page 39 100Hz UNIT SCHEMATIC DIAGRAM ...
Page 40: ...40 72FF 57E 81FF 57E SOUND OUTPUT UNIT SCHEMATIC DIAGRAM 1 I H G F E D C B A 2 3 4 5 6 7 9 8 ...
Page 41: ...41 72FF 57E 81FF 57E 72FF 57E BLOCK DIAGRAM 1 I H G F E D C B A 2 3 4 5 6 7 ...
Page 42: ...42 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 81FF 57E BLOCK DIAGRAM Page 43 ...
Page 43: ...43 72FF 57E 81FF 57E 8 9 10 11 12 13 14 I H G F E D C B A 81FF 57E BLOCK DIAGRAM Page 42 ...
Page 44: ...44 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 PWBs LAYOUT ...
Page 45: ...45 72FF 57E 81FF 57E 1 I H G F E D C B A 2 3 4 5 6 7 SCHEMATIC DIAGRAMS CONECTION ...
Page 59: ...59 72FF 57E 81FF 57E NOTES ...
