Yamaha CDX-730 Service Manual page 40

YAMAHA
TECHNICAL BULLETIN
ELECTRONICS CORPORATION, USA
'I. 6722 ORANGETIIORPE AVENUE, BUENA PAIlK, CAUFORNIA 90620 • MAIL ADDRESS: P.O. BOX 6660, BUENA PARK, CAliFORNIA 90622 • PHONE: (714) 522·9105
No.: 147H
Effective Date: September 28, 1990
MODEL:
SERIAL NUMBERS EFFECTED:
SUBJECT:
CDX-730 COMPACT DISC PLAYER
All
REPLACEMENT LASER HEAD
(and modification of Kick Gain Circuit)
TYPE OF CHANGE
MANDATORY OPTIONAL FOR INFO ONLY
o
D D
(When replacing a KSS-150A laser head
with a KSS-2l0A, it is necessary to
modify the Kick Gain circuit.)
The KSS-150A laser head has been replaced by a KSS-2l0A. Only the
newer (type KSS-2l0A) laser head is available as a replacement part,
therefore the original part number (PX600430) will be retained.
The new part can be used in early production units with no effect on
operation or performance -- however the new part requires modification of
the Kick Gain circuit.
To replace a KSS-150A with a KSS-2l0A, install the new laser head
and change the following resistors:
RESISTOR OLD VALUE NEW VALUE YAMAHA PIN
R-56 l30k Ohms 470k Ohms HF858470
R-63 82k Ohms 110k Ohms HF858ll0
NOTE: If a 110k Ohm resistor is not immediately available,
use two 220k Ohm resistors (YAMAHA
PIN
HF858220) in parallel.
R-64 , 10k Ohms 15k Ohms HF857150
R-65 , 5.6k Ohms., 8.2k Ohms HF856820
Finally, do a COMPLETE ADJUSTMENT (including confirmation of normal
"Kick Gain" operation) as shown in the CDX-730 Service Manual.