Test Table - Sennheiser SK 100 G2 Service Manual

4.4

Test table

Se- Type of measure-
quence ment/adjustment
1 Visual inspection
1.1 MIC/LINE jack
socket
1.2 MUTE slide control
1.3 / button
(S204 /S206),
SET button (S202),
ON/OFF (S208)
button
1.4 Battery
compartments
1.5 Charging contacts
(not SK 100 G2)
1.6 Antenna contacts
to RF PCB
1.7 Flat ribbon cables
and terminal strips
2 Motherboard: current and voltage measurement
Attention
The buttons S204, S206, S202, and S208 on the motherboard may be damaged, if you press them using sharp-edged flat
or pointed objects (e.g. the tip of a ballpoint pen). Only use objects with end-rounded tips that will not damage the
buttons.
2.1 Current
consumption when
transmitter is
switched off
2.2 Current
consumption when
in operation
2.3 Rated voltage
2.4 Operating voltage
2.5 DC to DC converter
voltage
2.6 Switch-on/switch-off thresholds
2.6.1 Switch-on threshold
when powered by
battery
2.6.2 Switch-on threshold
when powered by
accupack
2.6.3 Switch-off
threshold when
powered by battery
2.6.4 Switch-off
threshold when
powered by
accupack
12/27
Signal input Device settings
– –
– –
– –
– –
– –
– –
– –
– „POWER" = OFF
Supply +2.4V via „POWER" = ON;
DC
battery contacts (press button for approx
3 seconds)
See 2.2 See 2.2
See 2.2 See 2.2
See page 26
See 2.2 See 2.2
See 2.2 See 2.2
See 2.2; See 2.2
SK OFF: Connect the NTC
contact to ground via
isolated wire, then
switch on SK again:
See page 26
See 2.2 See 2.2
See 2.6.2 See 2.2
Mesuring Required
point/ test value
point
– –
– –
–
Buttons on
motherboard
spring back
– –
– –
– –
– –
≤
Connected in 220µA;
series to typ. 180µA
BK+ battery
contact
See page 26
≤
See 2.1 170mA
BK+ / BK- +2.4V
DC
BK+ / BK- +1.8V to
DC
+3.1V
DC
TP224/ GND +5,3V to
DC
+5,7V
DC
See 2.5 +1.8V
DC
See 2.5 +2.2V
DC
See 2.5 +1.8V
DC
See 2.5 +2.0V
DC
SK 100 G2, SK 300 G2, SK 500 G2
Remarks
Contacts are
not twisted, no
hairline cracks
at the solder
points, no
mechanical
damage
See 1.1
See 1.1
See 1.1
See 1.1
See 1.1
No mechanical
damage, locked
Current limita-
tion of labora-
tory power
supply unit:
ION = 300mA
LC display is
switched off.
Test points see
page 26
–
–
–
–
LED LOW BAT
has to flash
LED LOW BAT
has to flash
02/2005