Apc & Aeq Adjustment (Vc-227 Board); Processing After Completing Adjustments; Pll F & Lpf F - Sony DCR-PC100 Service Manual

5-3. APC & AEQ Adjustment (VC-227 board)
Mode Playback
Signal Recorded signal at "Preparations
before adjustments"
Measurement Point Pin w; of CN2903 (RF MON) (Note 1)
Ext. trigger : Pin qj of CN2903 (SWP)
Measuring Instrument Oscilloscope
Adjustment Page C
Adjustment Address 18, 19, 1B, 1C, 21, 73
Specified Value The display data of page: 3, address:
03 is "00"
Note 1: Connect a 75Ω resistor between Pin w; and Pin ql (GND) of
CN2903.
75Ω resistor (Parts code: 1-247-804-11)
Note 2: The "AGC Center Level Adjustment" must have already been
completed before starting this adjustment.
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Playback the recorded signal at "Preparations before
adjustments"
3) Select page: 3, address: 33, and set data: 08.
4) Check that the playback RF signal is stable.
5) Select page: 3, address: 01, set data: 07, and press the PAUSE
button of the adjustment remote commander.
6) Select page: 3, address: 02, and check that the data changes
from "07" to "00" in about 15 seconds after pressing the PAUSE
button.
7) Select page: 3, address: 03, and check that the data is "00".
Note: If the data of page: 3, address: 03 is other than "00", adjustment
has errors. (Take an appropriate remedial measures according
to the errors referring to the following table. )
8) Perform "Processing after Completing Adjustments".
Data of page: 3, Contents of defect
address: 03
20 Perform re-adjustment. (Note 3)
30 The machine is defective
50 Perform re-adjustment (Note 3)
60 The machine is defective
80 The machine is defective
Note 3: If this data is displayed twice successively, the machine is defective.

5-4. Processing after Completing Adjustments

1) Select page: 2, address: 30, and set data: 00.
2) Select page: 3, address: 33, and set data: 00.
3) Select page: 0, address: 01, and set data: 00.
PB RF signal is stable
Pin w;
Pin qj
Fig. 5-3-6.
6.7 msec
6. PLL f & LPF f Final Adjustment (VC-227 board)
0 0
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 3, address: 01, set data: 30, and press the PAUSE
button of the adjustment remote commander.
3) Select page: 3, address: 02, and check that the data changes to
"00".
4) Select page: 3, address: 03, and check that bit2, bit3 and bit 6
of the data are "0".
Note: If bit2, bit3 or bit 6 of the data is "1", there are errors. (For the
error contents, see the following table. For the bit values, refer
to "5-4. SERVICE MODE", "4-3. 3. Bit value discrimination".)
5) Select page: 0, address: 01, and set data: 00.
Bit value of page: 3,
address: 03
bit 4 = 1
bit 5 = 1
bit 6 = 1
bit 3 = 1
bit 2 = 1
5-47
VTR stop
Arbitrary
Display data of page: 3, address: 03
Adjustment remote commander
C
1F, 20, 22, 47
Bit2, bit3 and bit6 are "0"
Error contents
PLL f , even channel is defective
0
PLL f , odd channel is defective
0
LPF f is defective
0
PLL f final adjustment is defective
0
PLL f final adjustment time-out
0