20CT-25020CT-250
DESCRIPTION OF SCHEMATIC DIAGRAMeeeee Tuner�����RTUNQ0004KJZZ
NOTE: The parts here shown are supplied as an assembly but not independently.
HSAFETY NOTES:NOTES:H
1. DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE1. The unit of resistance "ohm" is omitted.
REPLACING PARTS.(K = 1000 ohms, M = Meg ohm).
2. SEMICONDUCTOR HEAT SINKS SHOULD BE REGARDED AS2. All resistors are 1/8 watt, unless otherwise noted.
POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS IS OPER-3. All capacitors are mF, unless otherwise noted. (PmmF). =
ATING.4. All capacitors are 50V, unless otherwise noted.
IMPORTANT SAFETY NOTICE:VOLTAGE MEASUREMENT CONDITIONS:
GPARTS MARKED WITH "�" ( ) ARE IMPORTANT FOR1. Voltage in parenthesis measured with no Signal.G
MAINTAINING THE SAFETY OF THE SET. BE SURE TO REPLACE2. Voltages without parenthesis measured with 3mV B & W or
THESE PARTS WITH SPECIFIED ONES FOR MAINTAINING THEColour-Signal.
SAFETY AND PERFORMANCE OF THE SET.3. All the voltages in each point are measured with VTVM.
SERVICE PRECAUTION:WAVEFORM MEASUREMENT CONDITIONS:
THE AREA ENCLOSED BY THIS LINE ( ) IS DIRECTLY1. Colour bar generator signal of 1.5V peak to peak applied at
CONNECTED WITH AC MAINS VOLTAGE.Base of Video Buffer Amp. Q202.
WHEN SERVICING THE AREA, CONNECT AN ISOLATING TRANS-2. Approximately 4.0 V AGC bias.
FFORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATEF
HAZARD OF ELECTRIC SHOCK.
WAVEFORMS
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NOTE: The parts here shown are supplied as an assembly but not independently.
12.0 Vp-p (H) 21.3 Vp-p (H) 31.5 Vp-p (H) 43.0 Vp-p (H) 53.0 Vp-p (H)
DD
CC
63.0 Vp-p (H) 780 Vp-p (H) 880 Vp-p (H) 980 Vp-p (H) 10 5.7 Vp-p (H)
BB
11 1.8 Vp-p (V) 12 0.8 Vp-p (H) 13 9.2 Vp-p (H) 14 1.8 Vp-p (V) 15 55 Vp-p (V)
AA
16 145 Vp-p (H)117 1000 Vp-p (H)218 150 Vp-p (H)3194 520 Vp-p (H)56718293104115126
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