Nikko ALPHA 220 - Diode and Zener Diode Data

NIKKO
SERVICE
DATA
NO, 81-001
DATE May 15. 1981
Important Information for your Parts and
Service Department
MODEL: ALPHA 220
ASSEMBLY: DRIVER PCB
For the purpose of protecting the transistors in the power stage
, replace
capacitors and resistors on the DRIVER
P. C. BOARD.
1. Capacitors
C703 and C704
(100 pf) are replaced
with new ones
(820 pf).
2, Resistors
R701 and R702 (2,
7 kohms) are replaced with
new ones
kohms).
These modifications are
already done for
the
units bearing Serial
No. C6534701 and up.
Q701
(Q702)
2SK150A
R701 (R702)
2 . 7K 1 K
IN PUT
GND
C703 (C704)
lOOP ~ 820P
PARTS LIST
DELETE
SYMBOL No.
DESCRIPTION
PART No.
003
, 704
Ceramic capacitor
232101K
100pf 10% 50V
R701, 702
Carbon film resistor
328272J
7 kohms
?iW
ADD
SYMBOL No,
DESCRIPTION
PART No.
C703
, 704
Ceramic capacitor
232821K
820pf
10%
50V
R701, 702
Carbon film resistor
328102J
1 kohms
?iW
NIKKO ELECTRIC MFG. CO.
, L TO.
HEAD OFFICE 4-
1. Okusawa 3-chome, Setagaya-
ku, Tokyo 158, .Japan
SALES OFFICE Mtsubishi
Bank Bldg., 3-2. Oogenzaka 1-
chome. Shibuya-ku. Tokyo 150. .Japan
NIKKO ELECTRIC CORP. OF AMERICA
HEAD OFFICE 320 Deer
Ave., Hauppauge. N.
Y. 11787. U.
A. OFFICE
7801 East Campton Blvd., Paramount. Ca. 90723. U.