DAEWOO DVF462N_262N
Service Manual

ELECTRICAL ADJUSTMENTS
ADJUSTMENT PROCEDURES
Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies. CAUTION: Inferior silicon grease can damage transistors. When replacing transistors, use only specified silicon grease. Remove all old silicon before applying new silicon.

2. COMB FILTER
CONDITIONS MODE-STOP Input Signal-NTSC Multiburst (VIDEO IN JACK) INSTRUCTIONS 1. Connect the video signal generator to VIDEO IN JACK. 2. Connect CH-1 on the oscilloscope to TJ303 and CH-2 to TJ304. 3. Trigger the scope with CH1. 4. Adjust R494 until the 3.58MHz component of multiburst signal becomes minimum. (Refer to Fig. 5-2)

1. PG SHIFTER
CONDITIONS MODE-PLAYBACK Input Signal-Alignment Tape (DN-1). INSTRUCTIONS 1. Connect CH-1 on the oscilloscope to pin ¤� of PT01 and CH-2 to Video output JACK. 2. Adjust R595 so that the waveform of the oscilloscope measures 6.5±0.5(H) at both leading and trailing edges. (Refer to Fig. 5-1-A, B)

Fig 5-2
CH-2

3. AUDIO BIAS
6.5H CH-1

CONDITIONS MODE-RECORD (SP MODE) Input Signal-Audio Signal : No Signal INSTRUCTION Connect the AC voltmeter as shown, then adjust the voltage to 3.0±0.1mVrms with R292 (Refer to fig. 3-6).

Fig 5-1-A

CH-2

A/C Head. AC Voltmeter TP2 TP1 (GND)

CH-1 6.5H

Fig 5-1-B

Fig 5-3

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