Fostex ADDA-2 PCB, D-25, D-30 Service Manual Supplement

Service Manual Supplement

ADDA-2 PCB

for
Model D-25/D-30

Digital Master Recorder

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION:

TO PREVENT ELECTRIC SHOCK, MATCH
WIDE BLADE OF PLUG TO WIDE SLOT,
FULLY INSERT.

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE COVER (OR BACK).

NO USER-SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

The lightening flash with arrowhead symbol,
within an equilateral triangle, is intended to
alert the user to the presence of uninsulated
“dangerous voltage” within the product's en­closure that may be of sufficient magnitude to
constitute a risk of electric shock to persons.

“WARNING”

“TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS­TURE.”

SAFETY INSTRUCTIONS

Read instructions - All the safety and operating instruc-

1.
tions should be read before the appliance is operated.
Retain instructions - The safety and operating instructions

2.
should be retained for future reference.
Heed warnings - All warnings on the appliance and in the

3.
operating instructions should be adhered to.
Follow instructions - All operating and use instructions

4.
should be followed.
Water and Moisture - The appliance should not be used

5.
near water - for example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, or near a
swimming pool, and the like.
Carts and Stands - The appliance should be used only

6.
with a cart or stand that is recommended by the manufac­turer.

An appliance and cart combination should be moved with
care. Quick stops, excessive force, and uneven surfaces
may cause the appliance and cart combination to over­turn.
Wall or Ceiling Mounting - The appliance should be

7.
mounted to a wall or ceiling only as recommended by the
manufacturer.
Ventilation - The appliance should be situated so that its

8.
location or position does not interfere with its proper ven­tilation. For example, the appliance should not be situ­ated on a bed, sofa, rug, or similar surface that may block
the ventilation openings; or, placed in a built-in installa­tion, such as a bookcase or cabinet that may impede the
flow of air through the ventilation openings.

ATTENTION:

POUR ÉVITER LES CHOCS ÉLECTRIQUES,
INTRODUIRE LA LAME LA PLUS LARGE DE
LA FICHE DANS LA BORNE CORRE­SPONDANTE DE LA PRISE ET POUSSER
JUSQU' AU FOND.

The exclamation point within an equilateral
triangle is intended to alert the user to the
presence of important operating and mainte­nance (servicing) instructions in the literature
accompanying the appliance.

Heat - The appliance should be situated away from heat

9.
sources such as radiators, heat registers, stoves, or other
appliances (including amplifiers) that produce heat.
Power Sources - The appliance should be connected to a

10.
power supply only of the type described in the operating
instructions or as marked on the appliance.
Grounding or Polarization - The precautions that should

11.
be taken so that the grounding or polarization means of
an appliance is not defeated.
Power Cord Protection - Power supply cords should be

12.
routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying
particular attention to cords at plugs, convenience recep­tacles, and the point where they exit from the appliance.
Cleaning - The appliance should be cleaned only as rec-

13.
ommended by the manufacturer.
Nonuse Periods - The power cord of the appliance should

14.
be unplugged from the outlet when left unused for a long
period of time.
Object and Liquid Entry - Care should be taken so that

15.
objects do not fall and liquids are not spilled into the en­closure through openings.
Damage requiring Service - The appliance should be ser-

16.
viced by qualified service personnel when:

The power supply cord or the plug has been damaged;

A.

or
Objects have fallen, or liquid has been spilled into the

B.

appliance; or
The appliance has been exposed to rain; or

C.

The appliance does not appear to operate normally or

D.

exhibits a marked changed in performance; or
The appliance has been dropped, or the enclosure

E.

damaged.

Servicing - The user should not attempt to service the ap-

17.
pliance beyond that described in the operating instruc­tions. All other servicing should be referred to qualified
service personnel.

TABLE OF CONTENTS

D-25/D-30 ADDA-2

1. ADJUSTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1. DA Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-2. AD Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. PATTERN DRAWING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4
4
5
6
8

10

NOTES

*

Adjustment procedures, parts list, pattern drawing and circuit diagrams are given in this manual to assist
the service technician in maintaining the D-25 / D-30 with ADDA-2 PCB assy.

*

For your information, the followings are the serial number of D-25 / D-30 with ADDA-2 PCB assy.

D-25 USA/CND : 0200407 and onwards

EUR : 0600407 and onwards
UK : 0700191 and onwards

D-30 USA/CND : 0920866 and onwards

EUR : 0920881 and onwards
UK : 0920901 and onwards

3

D-25/D-30 ADDA-2

1. ADJUSTING PROCEDURES

1-1. DA Level Adjustment

D-25 / D-30

5030

BAL IN

AUDIO OUT (XLR)

CH 1

Adjusting points : R192 (for CH 1) on ADDA-2 PCB

R292 (for CH 2) on ADDA-2 PCB

1.

Set up the D-25/D-30 as follows.

Sampling Frequency : 44.1kHz
REF Marker position : -12dB

2.

Connect the Model 5030 input (XLR) to the D-25/D-30 audio output CH 1 and CH 2 and an AC volt meter
to the Model 5030 (RCA) as shown in Fig. 1.

CH 2

(XLR)

Fig. 1

UNBAL OUT

(RCA)

CH 1 CH 2

AC

VOLTMETER

3.

Playback the 1kHz, 0dB section (PROG NO. 1) of SONY test tape TY-7551.

4.

Adjust R192 (CH 1) and R292 (CH 2) on the ADDA-2 PCB so that the AC volt meter reading is +2dBV. By
this adjustment, a 1kHz, +16dBm sine wave should appear at the D-25/D-30 audio output.

4

1-2. AD Level Adjustment

D-25/D-30 ADDA-2

CH 1

OSC

CH 2

UNBAL

5030

IN

BAL OUT BAL IN

UNBAL

OUT

CH 1 CH 2

CH 1 CH 2

AUDIO IN

(XLR)

AUDIO OUT

(XLR)

D-25 / D-30

Fig. 2

Adjusting points : R191 (for CH 1) on ADDA-2 PCB

R291 (for CH 2) on ADDA-2 PCB

CH 1

CH 2

AC

VOLTMETER

Set up the D-25/D-30 as follows.

1.
REF Marker position : -12dB
Sampling Frequency : 44.1kHz
A1, A2 INPUT MONITOR Key : ON position

Connect the sine wave oscillator, Model 5030, and AC volt meter with D-25/D-30 as shown in Fig. 2.

2.

Output a 1kHz, +4dBm sine wave signal from the sine wave oscillator. Under this setting, a 1kHz, +4dBm

3.

sine wave signal will be applied to the D-25/D-30 audio input terminal.

Adjust R191 (CH 1) and R291 (CH 2) on the ADDA-2 PCB so that the AC volt meter reading is -10dBV.

4.

5