Philips 7592 Service Manual page 51

CRT Panel PCB Test Point Guide
Each test point has a reference number indicating the functional block in which it is located.
A1-A2-A3, etc.: Test points for the audio processing circuitry [A6, C6]
C1-C2-C3, etc.: Test points for the control circuitry [C8]
F1-F2-F3, etc.: Test points for the frame drive and frame output circuitry [A3]
I1-I2-I3, etc.: Test points for the Intermediate Frequency Circuitry [A4, C1]
K1-K2-K3, etc: Test points for the Guide+ panel
L1-L2-L3, etc.: Test points for the line drive and line output circuitry [A2] and PIP-panel
P1-P2-P3, etc.: Test points for the power supply [A1]
S1, S2, S3, etc.: Test points for the synchronization circuitry [C1]
V1-V2-V3, etc.: Test points for the video processing circuitry [B, C2, C3]
Measurements should be performed under the following conditions:
Video: NTSC color bar signal
Audio: 3kHz left, 1kHz right