STR-KM7600 - Sony Audio Service Manual (repair manual). Page 3

UNLEADED  SOLDER
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 fl ow) 
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.

NOTE  OF  REPLACING  THE  IC3500  AND  IC3501  ON  
THE  HDMI  PC BOARD
IC3500 and IC3501 on the HDMI PC board cannot exchange with 
single. When IC3500 and IC3501 on the HDMI PC board are dam-
aged, exchange the entire mounted board.

Notes on chip component replacement
• 

Never reuse a disconnected chip component.

• 

Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.

SERVICING  NOTES............................................. 3

2-1.   Disassembly Flow .............................................................. 4
2-2.   Case .................................................................................... 4
2-3.   Back Panel Block ............................................................... 5
2-4.   Front Panel Block .............................................................. 5
2-5.   Main Block ........................................................................ 6
2-6.   Heatsink Block, Main Board ............................................. 6

TEST  MODE .......................................................... 7

ELECTRICAL  CHECK ......................................... 9

5-1.  Block Diagram — Display Section — .............................11
5-2.  Block Diagram — Video Section — ............................... 12
5-3.  Block Diagram — HDMI Section — .............................. 13
5-4.  Block Diagram — Standby DCDC Section — ................ 14
5-5.  Block Diagram — Digital (1/2) Section — ..................... 15
5-6.  Block Diagram — Digital (2/2) Section — ..................... 16
5-7.  Block Diagram — Connection Section — ...................... 17
5-8.  Block Diagram — Main Section — ................................ 18
5-9.  Printed Wiring Board — Main Board — ......................... 20
5-10.  Schematic Diagram — Main Board (1/4) — ................... 21
5-11.  Schematic Diagram — Main Board (2/4) — ................... 22
5-12.  Schematic Diagram — Main Board (3/4) — ................... 23
5-13.  Schematic Diagram — Main Board (4/4) — ................... 24
5-14.  Printed Wiring Board — Video Board — ........................ 25
5-15.  Schematic Diagram — Video Board — ........................... 26
5-16.  Printed Wiring Board — Video 2 Board —. .................... 27
5-17.  Schematic Diagram — Video 2 Board — ........................ 28
5-18.  Printed Wiring Board — HDMI PC Board (1/2) — ........ 29
5-19.  Printed Wiring Board — HDMI PC Board (2/2) —  ....... 30
5-20.  Schematic Diagram — HDMI PC Board (1/2) — ........... 31
5-21.  Schematic Diagram — HDMI PC Board (2/2) — ........... 32
5-22.  Printed Wiring Board — Standby DCDC Board — ........ 33
5-23.  Schematic Diagram — Standby DCDC Board — ........... 34
5-24.  Printed Wiring Board — Display Board — ..................... 35
5-25.  Schematic Diagram — Display Board — ........................ 36
5-26.  Printed Wiring Board — Digital Board (1/2) — ............. 37
5-27.  Printed Wiring Board — Digital Board (2/2) — ............. 38
5-28.  Schematic Diagram — Digital Board (1/4) — ................ 39
5-29.  Schematic Diagram — Digital Board (2/4) — ................ 40
5-30.  Schematic Diagram — Digital Board (3/4) — ................ 41
5-31.  Schematic Diagram — Digital Board (4/4) — ................ 42
5-32.  Printed Wiring Board — Connection Board — ............... 43
5-33.  Schematic Diagram — Connection Board — .................. 44
5-34.  Printed Wiring Board — Headphone Board — ............... 45
5-35.  Schematic Diagram — Headphone Board — .................. 45
5-36.  Printed Wiring Board — Power Key Board — ............... 45
5-37.  Schematic Diagram — Power Key Board — .................. 45
5-38.  Printed Wiring Board — Thermal Sensor Board — ........ 46
5-39.  Schematic Diagram — Thermal Sensor Board — ........... 46
5-40.  Printed Wiring Board — AC Select Board — ................. 47
5-41.  Schematic Diagram — AC Select Board — .................... 47

6-1.  Front Panel Section .......................................................... 59
6-2.  Back Panel Section .......................................................... 60
6-3. Main 

Section 

.................................................................... 61