Bose 402 502 802 ii 180520

Page 1

402W, 502W, 802® || Controllers 180520

Figure correction in service manuals

November 1, 1994

The block diagram in these manuals is incorrect. This affects the following figures:

502 manual (P/N 170310) Figure 12
402, 802 || manual (PIN 174785) Figure 22

For example, in the original block diagram, for the Channel 1 High Frequency Output,
P7-6 (+) is shown connected to pin 3. In reality, its connected to pin 2. All output con-
nections have been corrected in the new diagram. This agrees with the controller sche-
matics in both manuals.

Additionally, the Channel 2 High and Low Freq. outputs had their connections listed
backwards. P11 (Low Freq.) is now P12, and P12 (High Freq.) is now P11.

A corrected block diagram is attached. This replaces both figures mentioned above.

Page 2

From
Full Range *1
J3 . pp 23 ~ Mute-
Pe-s (+) . Circuit
Ei-am '
2 1 P6'4(GND) InputStag4 .l H.F.EQ . HPFp ---g ruiaunn 2
p5_5(_) 2 Output F7-5i-i . pg
. _ 19' Stage 3
Channel 1 Input Gmund T .24 P7-6(+)
From Option . ' Channel 1 '
Card High Freq. Output
Switchsa ToOpt'ion Card (P4 Pin7) 20
+440 63 Gain (P4. Pin 10) ' .
' From
6 d - Mute
m """" '°" _"'°-17 Circuit
(Grid) 8 ' *
ass E0
TPi TPZ PE-5(GND) 1 2
(+15 V) (-15 V) "6 Output mm P10
: 13, Stage 3
+ To Ground -o. -18 pg.6(+)
0 ion .15 .
. Power + CTN From Option . . Channel 1 '
SUppiy Low Freq. (P4, Card --¢ . Low Freq. Output
From DC Level Pin 4) (P4. Pin 3) ~14 Ode
Supp, Sum _ Control ; Selector
+ Output Mode : (R126) To Frorgggllon : (swftCh 51)
Mute 33'9 - 1 Option (P5, Pine) -2
Circuit (SWIich 52) ' Card '
. (P5 Ground .._¢ P6-1(GND) 1 2
Pin 4') 3 Output pm . P12
1 Stage 3
' Bass E0 --'4 o ' 6' f Fig.3 (1,)
To Output Stages ' Channel 2 -
Ground ,5 a m Low Freq. Output
_ u e
6(2): . Circuit
um .
....... Full Range -
J4 m -°
P6-3(+) .
P6-1 GN Bi-am
2 1 9 input $394 p HF so p HPFP _ mm 1 2
p6_2(_) 10 Output P7-2t-i . P11
' Stage a
Channel2 Input Gr°und "fl 1'2 , P7-3 (+)
From Option ' Channel 2 -
SwilchS4 Card .5 5'32 High Freq. Output
4/- ' P5. Fin - -
+ to dB Gain To option Cam ( 7) _ circuit
(i=5, Pin to)

Corrected block diagram