Nakamichi tx 1000 service manual

Page 1

Service Information

Model Nakamichi TX-1000 (Computing Turntable) NakflmiChi
Seria' No_ from V10101171- 4.082..
Addition of Controls, and Modification of Sensor Arm NO. OOD'M'0202 12)
Subject Descending Position Adjustment and Circuits Date 1 September 1982
1. General Lamp House P.C.B. Ass'y: T
1 1 Purpose From BA04704A to BA04850A

(1) Sensor Arm Position Screwdriver Controls have been
mounted on the Display Panel on the left side of the
TX-1000. Refer to Fig. 1.1.
Customer can calibrate the descending position
(touch-down position) of the Sensor Arm Stylus with
these controls. However, these controls are normally
set to their center click positions.
The permitted limit of descending position of the
Sensor Arm Stylus has been changed, and as a result
Stylus Positioning Gauge has been changed (grooves
showing the permitted limit on the Gauge changed).
Permitted Limit:
From "within $1.0 mm on the 30/25 or 17 cm
line" to "within 0 to -1.0 mm on the 30/25 or
17 cm line"
Stylus Positioning Gauge:
From 0004092A to 0009022A
Refer to 2-(4) Sensor Arm Descending Position
Adjustment".

(2)

1.2. Modification
(1) According to the modification stated in 1.1-(1),
following have been changed.
Display House Ass'y:
From HA08048A to HA08064A

' 2. Sensor Arm Adjustment

Note: Before adjustment, set the Sensor Arm Position
Screwdriver Controls (VR901 and VR902) located
alongside the Display Panel to their center click
positions.

Removal of Display House Ass'y

Take off the four Display Screws.

Remove Display Cover.

Peel off Display Name Plate which is stuck to Display

House Ass'y with adhesive tape.

Take out five screws to remove Display House Ass'y.

(1)
(a)
(b)
(e)

(d)

(2) Temperature-compensating Circuit Adjustment

Refer to Fig. 2.1.

(a) Connect a digital voltmeter to the test point LED
CURRENT.

Amp. P.C.B. Ass'y:
From BA04702A to BA04849A
(2) Circuit of the Control P.C.B. Ass'y (BA04672A) has
been modified.
(3) Patterns of the CPU P.C.B. Assv (BA04748A) have
been changed (circuit stays the same).
1.3. Compatibility (of new P.C.B. assemblies with
current ones)
Not possible. However, if the Lamp House P.C.B. Assy
and Amp. P.C.B. Ass'y are changed simultaneously, inter-
changeability is retained.

Plastic Driver
0003903C

Fig. 1.1

(b) One minute or more after turning on the power,
adjust VR602 to obtain 0 V i40 mV on the volt-
meter.
Note: During the adjustment the reading will slowly

fluctuate. It is adjusted sufficiently if the

reading is at least once within the above
rating.
LED CURRENT

Printed in Japan