Sony EVO-720P - Reel FG Adjustment (MD-18 P Board)

8-2-3. Reel FG Adjustment (MD-18P Board)
8-25.
Capstan
Free
Speed
Adjustment
(SE-7P
Board)
Mode ~ | Playback
Mode Playback
Signal Tape recorded in LP mode
Signal Arbitrary tape
TP9OL
Measurement Point | (pent FG.; Pin © of 1C903)
TP202
Measurement Point (CAP FG : Pin @ of 1C204)
Measuring Instrument | Frequency counter
Measuring Instrument | Frequency counter
Adjusting Element RVS01
Specified Value 21,0£1.0 Hz
SP mode: RV206 (SP FREE)|
Adjusting Element / 7p mode: RV208 (LP FREB)
Adjusting method :
1) Adjust to 21.0£1.0 Hz with RV902,
2) Connect the digital voltmeter to TP902 (V.S) and
confirm that the reel motor drive voltage. is
between 1.0 and 1.4 Vde. ‘de,
3) Check REEL FG frequency and VS voltage for
each mode as shown in the table below, then
adjust RV901 if required,
REEL FG VS
tot | to
CUE (x9) 1.7 to 2.3 Vde
Hi CUE (x19) 2.5 to 3.2 Vde
REVIEW (-x7) [sd .5 140.15 Vado
HI REVIEW
(=x17)
1.7840.15 Vde
Table. 8-1,
82.4.
Drum
Free
Speed
Adjustment
(SE-7P
Board)
[Signal Arbitrary
A TP213
Measurement Point (ADE : Pin @ of 1¢212)
Measuring Instrument | Digital voltmeter
Adjusting Element
Specified Value
RV202
1.90401 Vdc
Mode Recording -
Adjusting method :
1) Adjust to 1.90+0.1 Vde with RV202.
SP mode : 134141 Hz
Specified Value LP mode: 670+1 Ha
Connections :
1) Connect TP230 (PB ATF: Pin @ of IC701) to
GND with an electrolytic capacitor (100 “F/“10V)
(connect GND to the negative side of the
capacitor),
2) Connect TP240 (ATF LOCK: Pin @ of 1C701)
to GND with a jumper,
Adjusting method :
Adjusting elements for LP mode are shown.in (J,
1) For LP mode adjustment, connect Pin ® (REC
MODE SP/LP) of CNO03 to GND with a jumper,
2) Turn power ON,
3) Set the playback mode and adjust to, 1341 +1 Hz
[670 41 Hz] with RV206 [RV208].
| | Pro 4 Vp-p
134141 Hz (SP mode)
67021 Hz (LP mode)
Fig, 8-3.
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