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SERVICE BULLETIN
No. : VSB-85030
Date : 08/06/1998
KI-14U71
KI-14U71X
Model
KI-20U71
KI-20U72X
Buyer GB000001
From the shipment
EFFECTIVE DATE 31/05/1998 EFFECTIVE FROM(SERIAL NO.)
on June 1998
Subject Improvement of the reliability
Before Change After Change K-
No. LOC NO. Note Remark
PART NO. DESC./SPEC. PART NO. DESC./SPEC. CODE
SHIELD SHIELD
1 4814V00016A BUTTOM
4814V00016B MAIN 1 SBHG-1 . BOTTOM
B 3
Reason Of Change
Symptom : "HUM" in sound when playing a tape recorded in SET.
Countermeasure : Add a silicon shield plate to SHIELD BOTTOM.
** FILE THIS SERVICE BULLETIN WITH YOUR SERVICE MANUAL
NOTE(**) : INTERCHANGEABILITY CODE KEY-WORD CODE
Parts Set
Original or new parts may be used in early or
Original Early late production sets. 1. To improve performance
A
New Late Use original parts until exhausted, then stock 2. To improve productivity
new parts.
Original parts may be used in early production
sets only. 3. To improve reliability
Original Early
New parts may be used in early or late production
B sets.
New Late 4. Change of material or
Use original parts where possible, then stock new dimension
parts.
New parts only may be used in early or late 5. Addtion
Original Early
production sets.
C
New Late
Stock new parts. 6. Deletion
Original parts only may be used in early
Original Early production sets. 7. Correction
D New parts may be used in late production sets
New Late only.
Stock original and new parts.
CHIEF ENGINEER ,
FACTORY.
TROUBLE SHOOTING
NO POWER : NO STAND-BY
Check if the NO
Replace the Fuse
Fuse is O.K.?
YES
Is there voltage at NO Check/Replace
pin 9 of T801? D801, D802, 803, 804, R801, C807.
YES
NO Check/Replace
Is there about 6.1V
D806, Q801, R807, ZD801, C814,
at pin 9 of IC801?
IC801.
YES