Philips SCOPEMETER PM93 Service Manual page 276

MODIFICATIONS
ITEM FROM TO
C2137, C2237
1 )
4822 122 33515 82 PF
5322 122 32967 5.6 PF
C2340, C2341
5322 122 33896 15 PF 5322 122 31946 27 PF
L2303, L2304 5322 157 63647 100 nH removed
R2327, R2328
2
)
added on location of L2303, L2304 5322 111 91893
51E1
R2342, R2343
2)
5322 116 82896
46E4 5322 111 91 963 34E8
R2317 4822 111 91828 68K1 4822 051 51004 100K
R2338
2 )
5322 11681794 2K15 4822 051 51332 1K33
D2301 5322 209 30821 OQ0308N5. 5322 209 30821
OQ0308NQ
1 not to be modified, changed to 82 PF again at REVISION LEVEL 20, see below.
2) changed for REVISION LEVEL 20 again; to be modified directly to the value indicated at
REVISION LEVEL 20 below.
REVISION LEVEL 19 DATE: 92-02-25
Reason: Improvement of the *100 attenuation adjustment range.
ITEM
C2105,C2205
FROM
5322 122 33869
REVISION LEVEL 20
TO
15 PF 4822 12232139
DATE: 92-02-25
12 PF
11 - 9
Reason 1: Improvement of pulse response when the Oa0308 (02301) version § is installed.
The overshoot for fast rising slope at 1 Ons/div was too large.
ITEM FROM TO
R2323 5322 116 82898 464E removed
R2324 4822 11681789 316E removed
R2325 4822 111 91821 2K61 removed
R2338 4822051 51332 1K33 removed
V2301 5322 13042136 BC848C removed
V2302 5322 13044711 BFT92 removed
R2340, R2341 5322 116 82896 46E1 4822051 51001
100E
R2342, R2343 5322 111 91963 34E8 4822 111 91885 10E
R2327, R2328 5322 111 91893 51E1 4822 051 1 01 08 1E
R21 01, R2201 5322 11682895 31E6 4822 111 91885 10E
R2315 5322 111 91901 348E 4822 051 52611 261E
C2137,C2237 5322 122 32967 5.6 PF 4822 122 3351 5 82 PF
Reason 2: Trace(s) not at zero position after power on; the Volts RMS value gets slowly to
final value during first minute after power on.
ITEM
C2119, C2219
R2171, R2271
FROM
4822 12232916
5322 116 80428
REVISION LEVEL 21, no deliveries
220 NF
10K
TO
4822 122 33496
4822051 51001
100 NF
100E