TOSHIBA V-831EF
Service Manual

Alignment and Adjustment

a. ACE HEAD HEIGHT ADJUSTMENT 1) Run the alignment tape (Color bar) in the playback mode. 2) Observe surface of the audio head using a dental mirror. 3) Turn screw (C) clockwise or counterclockwise until the gap of lower tape edge and the lower edge of the control head is about 0.25mm. (Refer to Fig. 5-6 and 5-7)

b. ACE HEAD TILT ADJUSTMENT 1) Playback a blank tape and observe the position of the tape at the lower flange of tape guide. 2) Confirm that there is no curl or wrinkle at the lower flange of tape guide as shown in Fig. 5-8 (B). 3) If a curl or wrinkle of the tape occurrs, slightly turn the screw (A) tilt adjust on the ACE head ass�y. 4) Reconfirm the ACE head height.
(A) (B)

SCREW (A) TLIT ADJUST

SCREW (C) HEIGHT ADJUST WRINKLE

X-POSITION ADJUSTING SLIT SCREW (B) AZIMUTH ADJUST

SCREW (D) X-POSITION LOCKING

(BAD)

(GOOD)

Fig. 5-6 Location of ACE Head Adjustment Screw

Fig. 5-8 Tape Guide Check c. AUDIO AZIMUTH ADJUSTMENT

AUDIO HEAD VIDEO HEAD

0 ~ 0 .25 mm CONTROL HEAD

1) Load alignment tape (Mono scope) and playback the 6KHz signal. 2) Connect channel-1 scope probe to audio output test point (TP302). 3) Adjust screw (B) to achieve maximum audio level. (See Fig. 5-6) d. ACE HEAD POSITION (X-POINT) ADJUSTMENT

Fig. 5-7 ACE Head Height Adjustment

1) Playback the alignment tape (Color bar). 2) Press the �SW713� button on Main PCB to set the adjustment mode. (See Fig. 5-2) 3) Press the �5� button of remote control then adjustment is operated automatically. (See Fig. 5-1) 4) Connect the CH-1 probe to TP303 (Envelope) the CH-2 probe to TP601 (H�D switching pulse) and then trigger to CH-1. 5) Insert the (-) driver into the X-Point adjustment hole and adjust it so that envelope waveform is maximum. 6) Turn the Power off.

Toshiba

5-5