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8-6
2-4. SERVO SYSTEM ADJUSTMENT
2-4-1. RF Switching Position Adjustment (RP-213 Board)
[Adjustment Object]
To adjust the link of the Ach and Bch of the tape playback outputs.
If this specification is not satisfied, the noise will increase and cracking
sounds will be produced.
To adjust the link of the Ach and Bch of the tape playback outputs.
If this specification is not satisfied, the noise will increase and cracking
sounds will be produced.
Mode
Playback
Signal
Alignment tape : Color bar portion
Measurement
CH1 : CN502 pin2 (RF MONI)(RP-213 board)
point
CH2 : CN502 pin3 (RF SWP)(RP-213 board)
Measuring
Oscilloscope
instrument
Adjustment
PROGRAM +/– button
element
Specified
No dropouts in the RF signal
value
[Adjusting Method]
1) Playback the alignment tape. short the adjustment land JL207
1) Playback the alignment tape. short the adjustment land JL207
(MA-283 board) to the ground for 300 msec or more to enter the
RF SWP adjustment mode.
RF SWP adjustment mode.
2) Verify that "AD RF xx (xx : data value)" are indicated on the
display tube.
3) Use PROGRAM +/– buttons to adjust so that the portion A is
minimized.
4) Press PAUSE and write the data.
2-5. SYSTEM CONTROL/TIMER SYSTEM CHECK
2-5-1. Clock Check (MA-283 Board)
[Check Object]
To raise the accuracy of the clock.
If the clock is not accurate, its error difference will gradually increase.
To raise the accuracy of the clock.
If the clock is not accurate, its error difference will gradually increase.
Measurement
IC151 pin7 (BUZZER OUT)
point
Measuring
Frequency counter
instrument
(Interval counter mode)
Specified
0.1249995±0.0000005sec
value
[Check Method]
1) Connect the LANC jig and the adjusting remote commander.
2) Release the protect.
1) Connect the LANC jig and the adjusting remote commander.
2) Release the protect.
Page : 1, Address : 00, Data : 80.
3) Page : 2, Address : 00, Data : 02.
4) Page : 2, Address : 01, Data : 01.
5) After verification, turn the power off once to reset.
4) Page : 2, Address : 01, Data : 01.
5) After verification, turn the power off once to reset.
Fig. 8-2-5.
RF signal dropout (Should be minimized)
A
A
CH1
CN502 pin
CN502 pin
2
CH2
CN502 pin
CN502 pin
3
(RF SWP)
OK
NG
0.1249995±0.0000005sec
(32768.00±0.13Hz) x1/2
Fig. 8-2-6.
16
5V
Buffer
AMP
Divider
(1/256)
(1/256)
Frequency
counter
7
IC151
MA-283 board
High
impedance
probe
IC151 7
2048Hz
2048Hz
5V
0V
10
8
Q8
RST
VSS
CLOCK
13
11
8Hz
interval
counter
interval
counter
TC4020 or eluivalent
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