Jvc TDF 3000 Service Manual

Page 2

CA-F3000

- Safety Precautions

1.The design of this product contains special hardware and many circuits and components
specially for safety purposes. For continued protection, no changes should be made to the
original design unless authorised in writing by the manufacturer. Replacement parts must
be identical to those used in the original circuits.

2. Any unauthorised design alterations or additions will void the manufacturers guarantee;
furthermore the manufacturer cannot accept responsibility for personal injury or property
damage resulting therefrom.

3. Essential safety critical components are identified by (A) on the Parts List and by shading
on the schematics ,and must never be replaced by parts other than those listed in the
manual. Please note however that many electrical and mechanical parts in the product have
special safety related characteristics. These characteristics are often not evident from visual
inspection. Parts other than specified by the manufacturer may not have the same safety
characteristics as the recommended replacement parts shown in the Parts List of the service
manual and may create shock,fire, or other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and
the like to be separated from live parts, high temperature parts, moving parts and/or sharp
edges for the prevention of electric shock and fire hazard. When service is required, the
original lead routing and dress should be observed, and it should be confirmed that they
have been returned to normal, after re-assembling.

Warning

1. Service should be performed by qualified personnel only.
2. This equipment has been designed and manufactured to meet international safety standards.

3. it is the legal responsibility of the repairer to ensure that these safety standards are
maintained.

4. Repairs must be made in accordance with the relevant safety standards.
5. It is essential that safety critical components are replaced by approved parts.
6. If mains voltage selector is provided, check setting for local voltage.

Page 30

AX-F3000

ADJUSTMENT PROCEDURES

I Idling Current

(1)
(2)
(3)

(4)
(5)
mV ~ 22mV.
R772
-'0
Q4; 0

l©l
d
o

R752

Set the volume control to minimum during this adjustment.
Turn R751 and R752 fully counterclockwise before the power is switch on.

Always start from cold, and allow 5 minutes to warm up before adjustment.
If the heatsink is already warm from previous use the correct adjustment can not be made.

Connect a DC voltmeter to R771 resistors leads for left channel, or to R772 for right channel.

Adjust R751 for left channel, or R752 for right channel, so that the DC voltmeter becomes 2.2

I \f\/\/'\

Rch
POWER AMP.
P.C.B

- ~ _
Lch
POWER AMP.
P.C.B

B I

R77 R751 /
© /
/

Page 35

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Page 114

$1.3

P4-14-a