Sony BKM-B10, PFM-42B1E, RM-42B, PFM-42B1

3-26 PFM-42B1, PFM-42B1E

3-5. Video Processor Adjustment

YUV Level Check and Adjustment

Note: Be sure to use the Z MOUNT (extension board).

1. Connect the YUV 480/60 signal to the INPUT-1

connector.

2. Select the color bar signal.

3. Measure the voltage waveform at pin-14 of IC1003 on

the B board with an oscilloscope. Confirm that

amplitude of the signal portion excluding the sync

signal is in the range of 600 mV ± 5%.

(If the video signal excluding sync is outside the

specifications, adjust the video signal level using the Y

GAIN.)

4. Measure the voltage waveform at pin-15 of IC1003

with an oscilloscope. Confirm that the R-Y signal has

the following amplitude.

580 mV ± 5 %

(If the R-Y signal is outside the specifications, adjust

the R-Y signal level using the R-Y GAIN.)

5. Measure the voltage waveform at pin-4 of IC1003 with

an oscilloscope. Confirm that the B-Y signal has the

following amplitude.

700 mV ± 5 %

(If the B-Y signal is outside the specifications, adjust

the B-Y signal level using the B-Y GAIN.)

Cutoff Adjustment

1. Connect the Y signal of the 525/60 signal to the Y

input only of the YUV input connector.

2. Select the gray scale signal.

3. Observe the dark area of display screen. Adjust R

CUTOFF and B CUTOFF until the dark area has

completely no color at all.

3-6. Watch Error Adjustment

1. Connect the jig circuit as shown in Fig. (b) and a

frequency counter to the B board CN18.

2. Enter the measurement value on a frequency counter in

the WATCH ERROR.

WATCH ERROR Jig Circuit

Fig. (b)

CN18

VCC

CLOCK

GND

10kΩ

Frequency counter