position. The Digital Section is OK. If A3U2C (Pin 8) doesn't go high, check divider and state machine circuitry. See
A3 Power Amp section for additional information.
s. Signature Analysis:
CAUTION
When taking signatures, ensure that heater test jumper is in the off position.
Damage to the high voltage power supply or laser tube assembly could result if
these instructions are not adhered to.
With the power (±15 Vdc) disconnected, set the HP5517B/C/D switches and test jumpers as
follows:
• HTR OK = HI
• -REF ON = HI
• RESET = TEST
• CLOCK FREQUENCY = Remove
• HEATER = OFF
• A3TP2, A3TP3 and Pin "X" of HTR OK = jumpered to Ground
Connect the Signature Analyzer (HP 5005A/B) test pod leads as follows:
• GND = A3TP4 (labeled "GRD")
• CLOCK = A3TP5 (labeled "CLK")
• STOP = A3TP6 (labeled "STP")
• START = A3TP7
Connect signature analyzer front panel controls as follows:
• CLOCK, START, and STOP Polarity set for falling edge.
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