Philips SCOPEMETER PM93 Service Manual page 139

7 - 10 CORRECTIVE MAINTENANCE
TP Name Scope
Freq. Data Description
Per. H/UA
222 NOT_ON 0 L NOT ON
l
+0.8V
223 RAM
-
POWER 0 H RAM POWER
- - - - - - - - - - - - - - - - - - - - - - - - - --0
l _ _
+5V
224 +VRAM 0
H +Supply Voltage for the
-
~
- - - - - - - - - -
- --0
RAMI ...
+2.3V
233 V1 0
H Power supply for LCD drive
- - - - - - - - - - - - - - - - - - - - - - - - - --0
(+2.3V)
- - - - - - - - - - - - - - - - - - - - - - - - - --0
234 V2
0 L Power supply for LCD drive
23V
(-23V)
~
- - - - - - - - - - - - - - - - - - - - - - - - - -0
235 V3 0 L Power supply for LCD drive
0.8V
( -0.8V)
~
- - - - - - - - - - - - - - - - - - - - - - - - - --0
236 V4 0
L Power supply for LCD drive
20V
(-20V)
~----------------
- - - - - - --0
237 V5
0 L Power supply for LCD drive
22V
(-22V)
l
+0.8V
238
V6 H Power supply for LCD drive
- - - - - - - - - - - - - - - - - - - - - - - - - --0
(+0.8V)
239
~PCLK
12.5 MHz A
~Processor
clock, point 9 of
- -
01201
240 GROUND
241 BAT
-
LEVEL
t ___________
0 H BATtery LEVEUanalog
channel 6, point 20 of 01201
244 RAMSELN
ILJl[LJ][l_
A RAM SELect Not, point 20 of
01204
246
OPTSELN
-.uuumnruuuuI-
500 kHz A Option Select Not
247 A15
lrLJuuLJu _____
2 MHz A .. JROM 1 select not
248 -20V
~ - - - - - - - - - - - - - - - - - - - - - - - - - - - -0
0 H -20V supply
20V
+5V
249
+5V
0 H +5V supply
- - - - - - - - - - - - - - - - - - - - - - - - - - - 0