STR-DG2100 - Sony Audio Service Manual (repair manual). Page 5

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Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 °C higher

than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 

°C.

Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

Replacement of IC3601 on the D_VIDEO board used in this set
requires a special tool.

IC3511 and IC3513 on the D_VIDEO board cannot exchange with
single. When IC3511 and IC3513 on the D_VIDEO board are
damaged, exchange the entire mounted board.

IC5002 and IC5202 on the DSP board cannot exchange with single.
When IC5002 and IC5202 on the DSP board are damaged, exchange
the entire mounted board.

Perform operation of the following when the update of software of the IC2003 on the CONTROL board, IC3610 on the D_VIDEO board and
IC5208 on the DSP board is necessary.

1. Remove the KNOB (VOL) ASSY and connect CN717 on the MAIN VOL board and PC by using the jig.
2. Turn on the main power.
3. The update is executed by using PC.
4. When the update ends, turn off the main power.
5. Remove the jig from the CN717 on the MAIN VOL board and PC.

If there is a malfunction, the display shows a code of two numbers and a message. You can check the condition of the system by the
message. Refer to the following table to solve the problem.

messages

cause and response

PROTECTOR

Irregular current is output to the speakers, or the upper panel of the receiver is covered with something.
The receiver will automatically turn off after a few seconds. Cheack the speakers connection and turn
on the power again.

JIG 
(Part No. : J-2501-300-A)

for PC

CN717

MAIN VOL board