Test Program And Power Supply Check; Voltage Checks On The Main Pwb - Panasonic JS-170FR Series Service Manual

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3

Test Program and Power Supply Check

3.1

Voltage checks on the MAIN PWB

1)
Prior to inspection, all loads, such as the LCD unit, HDD, fluorescent display tube, peripheral PWBs, etc., shall be
connected.
2)
For the AC power supplies, each power input shall conform to the requirements of rating.
3)
Voltage values
Item
+3V
+5V
+5VSB
+12V
-12V
+15V
CORE
VCCP
+2.5V
RTCVCC
4)
Measurement of currents in the RTC backup circuit
Standard value
Measuring circuit
DC power
supply
+3V
z
The battery shall be disconnected during measurement.
z
Measurement shall be performed with the power supply turned off.
Note) Standard values shall be obtained through measurements at a room temperature.
Measuring point
CN26_8pin
-
TP6(GND
CN26_18pin
-
TP6(GND)
CN26_1pin
-
TP6(GND)
CN26_4pin
TP6(GND)
CN26_28pin
-
TP6(GND)
CN26_2pin
-
TP6(GND)
JP8
-
TP5(GND)
JP7_3pin
TP4(GND)
JP8_2pin
TP4(GND)
TR1(RTCVCC) -
TP4(GND)
2~15µA
A
3-1
Standard [V]
Remarks
+3.3V±0.16
+5.0V±0.25
+5.0V±0.25
+12.0±0.6
-12.0±0.6
+13.5~20
+1.6±0.13
+1.8±0.09
+2.5±0.12
Lithium battery (with the power
+3.0, +0.4, -0.6
turned off)
Main PWB
Pin 1 of BTI (+ terminal side)
Pin 2 of BTI (- terminal side)

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