No.7 Guide (Tg7) Adjustment; Cue, Rev Waveforms Check; Checks After Adjustments; Waveform Build-Up Check - Sony DCR-TRV140 Service Manual

2-4-3.

No.7 Guide (TG7) Adjustment

1) Playback a tape in REV mode.
2) Confirm that tape slack dose not occur in between the guide
No.6 (TG6) 1 and capstan 2. If the tape slack is found, turn
the height adjustment screw 4 of the Guide No.7 (TG7) 3
until tape slack is removed.
3) Playback a tape in normal mode. Confirm that tape slack dose
not occur in between the guide No.7 (TG7) 3 and capstan 2.
(Specification = 0.5 mm or less) If the tape slack of more than
0.5 mm is found, turn the height adjustment screw 4 until the
slack is 0.5 mm or less. Playback a tape in REV mode and
confirm that tape slack occurred in between the guide No.6
(TG6) 1 and capstan 2 is 0.3 mm or less, the adjustment is
complete.
2 Capstan
4 TG7 nut
3 No.7 guide
(TG7)
Tape slack
Fig. 5-2-8
2-4-4.

CUE, REV Waveforms Check

1) Playback the SW/OL standard tape (WR5-2D) in REV mode.
Confirm that pitches between the peaks of the waveform are
equally spaced for 5 seconds or longer.
The pitches are not equally spaced, perform section "2-4-2.
Tape path Adjustment" and section "2-4-3. No.7 Guide (TG7)
Adjustment".
2) Playback the SW/OL standard tape in CUE mode.
Confirm that pitches between the peaks of the waveform are
equally spaced for 5 seconds or longer.
The pitches are not equally spaced, perform section "2-4-2.
Tape path Adjustment".
a b
Fig. 5-2-9
1 No.6 guide
(TG6)
c d
DCR-TRV140/TRV140E/TRV140M
2-5.

CHECKS AFTER ADJUSTMENTS

2-5-1.

Waveform Build-up Check

1) Playback the SW/OL standard tape.
2) Eject the tape once, insert and load the tape.
3) Start playing back the tape and confirm that the RF waveform
builds up in three seconds with flat envelope. Confirm at this
time that tape slack dose not occur near pinch roller.
4) Playback the tape in CUE/REV and FF/REW modes respec-
tively. Confirm that the RF waveform builds up in three sec-
onds with flat envelope. Confirm at this time that tape slack
dose not occur near pinch roller.
5) Repeat the check items 2) to 5) again.
Capstan
No.7 guide
(TG7)
Tape slack
2-5-2.

Tape Path Check

1) Insert a thin video tape such as P6-120MP (NTSC) or P5-
120MP (PAL). Playback the thin tape. Confirm that there is
no clearance or curl of 0.3 mm or more at the following points:
Upper flange of guide No.3, upper flange of guide No. 6, up-
per and lower flanges of guide No.7.
2) Confirm that there is no clearance or curl of 0.3 mm or more at
each tape guide when the FF button is pressed from the play-
back mode to enter the CUE mode, and when the REW button
is pressed from the playback mode to enter the REV mode.
No.6 guide
(TG6)
No.7 guide
(TG7)
Pinch roller
Capstan
5-33
No.6 guide
(TG6)
Fig. 5-2-10
No.1 guide
(TG1)
No.3 guide
(TG3)
Drum
Fig. 5-2-11