Marantz SR-7300 Sevice Bulletin

Date:

15-May-2003 Model SR7300

Page:

REF.NBR:

Int.ref:

SERVICE BULLETIN

Peel off the sheet

1/1

Subject:

Circulation: Application:

Broken Knob

x for information

customer complaint
in case of service
mandatory

...................

MZxxxxxx01xxxx

to

MZxxxxxx13xxxx

[ PHENOMENON]

Broken Volume or Selector knob by transportation.

[REASONS]

A clearance between the front panel and knob were a little large and get stress to the volume shaft.

[SOLUTION]

Add the spacer to the front panel as follows.
( Spacer : parts No. 03AJ118010)

MZ03-003

Spacer Parts# 03AJ118010)

Stick the spacer and push it strongly .

[REMARKS]

This improvement has been done in the production line after the LOT number "14" and later
(The LOT number is "##" of serial number "MZxxxxxx##xxxx".)

Approved by H.TAMURA Written by K.ONO

Date:

15-May-2003 Model SR7300

Page:

REF.NBR:

Int.ref:

SERVICE BULLETIN

1/2

MZ03-006

Subject:

Circulation: Application:

Improvement of high tone noise

x for information

customer complaint
in case of service
mandatory

ALL

...................

[ PHENOMENON]

High tone noise can be heard a little from speaker.

[SOLUTION]

Please apply the modification of Solution 1 and Solution 2 to the units Lot 01 to Lot 15.
Please apply the modification of Solution 2 to the units Lot 16 and after. (Solution 1 has already applied to the units
lot 16 and later.)

* The lot number is mentioned in the Serial number label on the rear panel.

( ex. MZxxxxxx01xxxx : 01 lot)

Solution 1 ( For lot 01 to 15)

1) Cut a jumper wire [U304] on the PS04 board.

Cut the Jumper wire [U304]

2) Add a capacitor < 1000uF/10V : Parts # OA10801020> between the pin 3 of the Q681 and
the “-“side of the CU80 as follows.

Solder to the pin 3 of Q681

Add and solder a capacitor
1000uF/16v.
Solder “+” side of the capacitor to
the pin 3 of Q681. And “-“ side to
the CU80( “-“ side )

Solder to the “-“ side of CU80

Approved by H.TAMURA Written by K.ONO

Add tube and fix the cap by glue.