HP 8901B

Model 8901B Adjustments
Assembly Repaired
A1 Keyboard and Display Assembly
A2 Audio Filter Assembly
A3 Audio De-emphasis and Output
Table 5-2. Post-Repair Tests, Adjustments, and Checks (I of 2)
Test, Adjustment, or Check
Power-Up Checks
Service Special Functions (Use 60.0 SPCL, Key Scan, and exercise all keys.)
Performance Test
1 - AM
Adjustment
7 - 15 kHz and >20 kHz Low-Pass Filter Gain
Adjustment 15
- AM Sensitivity
Performance Test
2 - FM (FM Distortion - 1.5 MHz IF only)
A4 FM Demodulator Assembly
Assembly
Adjustment 13 - QM Sensitivity
Performance Test 2
- FM
Adjustment 10
- FM Sensitivity
Performance Test 3 - QM
I Performance Test 4 - Audio Filters
A5 Voltmeter Assembly
Adjustment 11 - FM Flatness
Adjustment
6 - Voltmeter Offset and Sensitivity
Service Special Functions (Use 49.N and
50.N SPCL, Display Internal Volt-
A6 AM Demodulator Assembly
I
aaes. and check for reasonable readinas.)
Performance Test 1 - AM
Adjustment
8 - ALC Reference
Adjustment 12
- FM Distortion and Incidental AM - 1.5 MHz IF
Adiustment 15
- AM Sensitivitv
A1 0 Power Supply Regulators
A1
1 Counter Assembly
A13 Controller Assembly
A14 Remote Interface Assembly
A15 RF Input Assembly
A17 Input Mixer Assembly
A18
IF Amplifier Assembly
A19
LO Divider Assembly
Assem bly
A20 LO Control Assembly
A21 Low Frequency VCXO Filter
A22 Low Frequency VCXO Assembly
A23 Sampler Assembly
Assembly
A24 High Frequency VCO Assembly
Adjustment 1 - Power Supply
Adjustment 2 - Internal Reference Frequency
Power-up Checks
Adjustment 22
- Battery Backup
Power-Up Checks
HP-IB Functional Checks
Power-Up Checks
Adjustment
3 - RF Level Detector Offset
Adjustment 12
- FM Distortion and Incidental AM - 1.5 MHz IF
Adjustment 16
- FM Distortion and Incidental AM - 455 kHz IF
Adjustment 5 - LO Doubler Output Power and Balance (Doubler repairs
Power-Up Checks
Performance Test
2 - FM (Residual FM only)
Power-Up Checks
Power-Up Checks
Performance Test 2 - FM (Residual FM only)
Power-Up Checks
Performance Test
2 - FM (Residual FM only)
Adjustment 4
- Sampler Efficiency and Offset
Power-Up Checks
Performance Test 2
- FM (Residual FM only)
Power-Up Checks
only)
rev. 02FEB88
5-3