Akai VT 110 Service Manual

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AKAI ELECTRIC CO., LTD. No, vs-017

(P.O.BOX 21, Tokyo International Airport. Japan}
12-14, 2vch0me. Higashi-Kojiya, Ohta-ku. Tokyo. Japan

D ate : March, 1974

TELEPHONE: TOKYO (742)5111 / CABLE: HIFIAKAl TOKYO fTELEX: .123261

MANUFACTURER 8:. EXPORTER I
TAPE RECORDERSi'TAPE DECKS

S E I IVI C E BU L L E I I N TUNERS & AMPLIFIERSISPEAKER SYSTEMS
VIDEO TAPE RECORDERS

RE : Model
SUBJECT :

Advice of Misc. Changes (Video)

I. Change in Servo Circuit of VT-l ID

i)

ii]

Resistor R6007 68 kS'l in MultiNibrator circuit of C.C.IR- type Servo PC. Board has been changed to
82 k0.

Explanation: Because there were cases in which the tracking pulse width could not be adjusted.
Change from: Serial No. 8| 120-0001

COndenser C6037 10 ,uFf6.3V has been supplemented in transistor TR6002 Base circuit of [1.8. type
Servo PIT. Board.

Explanation: To eliminate a swaying picture.
Change from: Serial No. 901 15-0001

96008 39::
W T
£7 vneooz
R6007 IOOKB
hC
92x Tn mo
9

TR6002
ZSCSESIFJ

R6013 2.2K
860K IOK

Fig. 1

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2. Change in 9V Regulator circuit of VT-l 10

Resistor R8001 2.2 kg in 9V Regulator circuit of Motor Drive & Power Supply P.C. Board has been changed
to 5109, and Resistor R8021 51082 and Condenser C1086 10 uFiléV have been supplemented.

EXpianation: To eliminate flickering on Monitor screen during recording mode at lower voltage.
Change from: Serial No. 90114-000]

TRBOOI
4 a I 23C454tai
AUTO STOP T
W?
(D
@- fig ©
0-
2
Ci
§* - .
.0 ° W are
1%? o 3; "a ...
° M! O 0 9 3
L
--&O_O---- Flg 2

3. Change in 5.8.6. P.C. Board of VT-IIO

I05
VINO.

To improve stability of video switching point when dubbing or when recording with T.V. Tuner Adaptor,
the Sync- Signal Separator circuit has been changed as shown in the diagram below.

Change from: Serial No.-90720-0001

Ins TR? de 1R9
234553qu escrow) 25c {F} csoostwnr} R3 '00 9v nor PB
§ , l _ r H nor s'rlLI.
l-h u-
. I 48c:
C
cue
IOIIG n32 IBK
g 0 V. SYNC.
e are.
I
C can
TO RELAY .
Fig. 3

4. Change in Video Camera V01 15

i) To prevent the vidicon tube from protruding due to shock Or the picture become out of focus, a
Vidicon tube holding plate has been supplemented on the face of the Vidicon Coil Assy.

Change from: Oct, 1973

(When replacing Vidicon, remove coil assembly and take out Vidicon after removing the 3 Vidicon
holding plate fixation screws.)

ii) To eliminate oscillation of the PreAmpiifier, Condenser Cl 0.22m?! 100V has been changed to a
shield type condenser. At the same time Resistor R4, R8 and R36 were changed as follows:

R4 1-5 k9 changed to 1.0 3:51

R8 33.0 k9 changed to 22.0 k0.

R36 5.6 It!) changed to 6.2 k9.
Change from: Middle of Lot No. 90223