![background image](http://html1.mh-extra.com/html/sennheiser/drm-85/drm-85_service-manual_1241601039.webp)
DRM 85-C, DRM 85
08/2007
39/41
+3.3V
100pJ
C601
100pJ
C602
100nK
C607
PUSH_SEL
22uM
C603
SELECT
10uM
C610
10uM
C614
PWR_CTL
10uM
C619
VBUS
2.2MJ
R620
100RJ
R621
100RJ
R622
1.0MJ
R612
100KJ
R605
10nK
C608
**
10uM
C616
SI2302DS
Q603
SUPPLY_OK
SI2301ADS
Q602
1.0nK
C604
10nK
C612
100nK
C613
100nK
C617
100nK
C618
22pJ
C606
**
150u6V3
C611
4.7pB
C605
22uM
C609
33KJ
R608
33KJ
R609
4.7MJ
R604
1.0MJ
R607
1.0MF
R616
10nK
C615
1.0MJ
R617
10KJ
R619
499KF
R611
47KJ
R613
**
47KJ
R618
1SS355
D607
LTC3401
U600
Rt
1
MODE/SYNC
2
Vin
3
SW
4
GND
5
PGOOD
6
Vout
7
FB
8
Vc
9
SHDN
10
22u
L600
10uM
L601
M2
M1
+3.3V
EVER_3.3V
+1.8V
100nK
C623
10nK
C624
100nK
C634
100nK
C625
10nK
C626
100nK
C632
100nK
C627
10nK
C628
4.7u4V
C633
100nK
C629
10nK
C630
+3.3V
10nK
C622
100nK
C631
1.5KJ
R623
USB_1
DIOR
DIOW
SUS
V
BUS
USB_DP
USB_DN
USB_RESET
12.1KD
R624
+3.3V
22pF
C620
22pF
C621
M5
A[8-1]
D[31-16]
10KJ
R615
+3.3V
10KJ
R614
10KJ
R606
MBR0520
D602
MBR0520
D608
BAT54
D604
BAT54
D603
BAT54
D605
M3
ISP1582
U602
VCCio
21
34
48
VCC
53
54
VCC_1V8
28
14
05
29
26
DGND
13
5
AGND
1
59
60
61
62
DIE_PAD
63
64
65
66
67
ISP1582
U602
CS
15
RD
16
WR
17
A0
18
A1
19
A2
20
A3
22
A4
23
A5
24
A6
25
A7
27
XTAL1
52
XTAL2
51
WAKEUP
55
INT
14
EOT
8
DREQ
9
DACK
10
DIOR
11
DIOW
12
SUSPEND
56
RESET
7
VBUS
49
RREF
6
DM
4
DP
3
RPU
2
D15
47
D14
46
D13
45
D12
44
D11
43
D10
42
D9
40
D8
39
D7
38
D6
37
D5
36
D4
35
D3
33
D2
32
D1
31
D0
30
TP600
LTC3405AES6-1.8
U601
RUN
1
GND
2
SW
3
Vin
4
Vfb
5
MODE
6
82.5KF
R601
Accu_U1/2
12MHz
Y600
=
1
>
74LVC32
1
U603
1
2
3
=
1
>
74LVC32
2
U603
4
5
6
=
1
>
74LVC32
3
U603
9
10
8
=
1
>
74LVC32
4
U603
12
13
11
+
-
74LVC32
U603
14
7
&
74LVT08
1
U604
1
2
3
&
74LVT08
2
U604
4
5
6
&
74LVT08
3
U604
9
10
8
&
74LVT08
4
U604
12
13
11
+
-
74LVT08
U604
14
7
+3.3V
100nK
C635
100nK
C636
USB
OE
RW
+3.3V
3.3uN
L602
10nK
C600
**
SI2302DS
Q601
100KJ
R632
1.0MJ
R631
SHDN_CTRL_BATT
10KJ
R633
+3.3V
USB_EOT
SI2302DS
Q604
100KJ
R603
MODE
1.0MJ
R602
HM470
L603
HM470
L604
A[1]
A[2]
A[4]
A[3]
A[8]
A[6]
A[7]
A[5]
D[16]
D[17]
D[19]
D[18]
D[21]
D[20]
D[22]
D[23]
D[25]
D[24]
D[26]
D[27]
D[29]
D[28]
D[30]
D[31]
-UBatt
+UBatt
120406Lew1440
Chassis
** = not mounted
C600 C606 C608 R613
Processor
board,
circuit
diagram, part 3/3